The Allison 1000 transmission valve physique, a vital part in heavy-duty automobiles, is the unsung hero behind easy shifts and dependable efficiency. Understanding its intricate design, operational intricacies, and potential points is vital to maximizing your automobile’s lifespan. This complete information dives deep into each side, from elementary operation to superior troubleshooting and upkeep.
This detailed exploration covers every little thing from the valve physique’s key parts and features to troubleshooting widespread issues and upkeep procedures. We’ll additionally contact on design ideas, efficiency traits, potential upgrades, and particular troubleshooting steps for varied points. So, let’s embark on this journey into the center of the Allison 1000 transmission!
Introduction to Allison 1000 Transmission Valve Physique
The Allison 1000 collection transmission, a stalwart in heavy-duty purposes, depends closely on its valve physique for easy and environment friendly operation. This intricate part acts because the management heart for the transmission’s hydraulic system, orchestrating shifts and sustaining optimum stress all through the system. Understanding the valve physique’s internal workings is vital to appreciating the transmission’s total performance.The Allison 1000 valve physique is a classy meeting of interconnected passages, orifices, and management valves.
These parts work in live performance to handle the circulation of hydraulic fluid, translating driver inputs into exact gear shifts. Its design ensures a seamless transition between gears, minimizing put on and maximizing efficiency. That is essential in heavy-duty automobiles the place easy operation and dependable shifting are paramount.
Key Elements and Their Capabilities
The valve physique’s design just isn’t arbitrary; every part has a selected position in controlling hydraulic stress and circulation. The intricate association of those parts permits the transmission to react to driver instructions, adjusting to various load circumstances and automobile speeds. This responsiveness is significant for optimum efficiency.
Main Elements of the Allison 1000 Valve Physique
Understanding the valve physique’s parts is essential to appreciating its total perform. This desk Artikels the foremost parts, their features, and their typical places throughout the transmission.
| Part | Operate | Typical Location | Description |
|---|---|---|---|
| Management Valves | Immediately management the circulation of hydraulic fluid to the assorted actuators throughout the transmission. These valves modulate stress primarily based on driver inputs and automobile circumstances. | Central space of the valve physique | These are sometimes small, precision-engineered parts, often that includes a number of ports and is derived. |
| Solenoid Pack | Electrically managed valves that regulate hydraulic stress to the assorted parts, influencing the shifting course of. | Embedded within the valve physique | These parts are essential for correct shifting, permitting for a direct response to driver instructions. |
| Hydraulic Channels | Advanced community of passages that route hydraulic fluid to completely different components of the transmission, enabling exact management of stress and circulation. | All through the valve physique | These channels are exactly machined to keep up constant fluid circulation and stress, important for dependable operation. |
| Shifting Cam | These cams, activated by the hydraulic system, exactly transfer the transmission parts into completely different gear positions. | Central space of the valve physique | They translate the hydraulic stress into mechanical motion, guaranteeing easy and correct gear shifts. |
Troubleshooting and Analysis
The Allison 1000 transmission, a workhorse in heavy-duty purposes, can generally current challenges. Correct troubleshooting is essential for environment friendly repairs and minimizing downtime. Understanding widespread points, diagnostic procedures, and using diagnostic instruments are key to efficient upkeep. This part delves into these crucial facets.Figuring out the foundation reason behind a malfunctioning valve physique is commonly step one towards a swift and efficient restore.
Signs, whereas generally refined, can present invaluable clues. A methodical method, mixed with an excellent understanding of the valve physique’s internal workings, will considerably enhance the chance of pinpointing the exact difficulty.
Frequent Valve Physique Points
A spread of points can have an effect on the Allison 1000 transmission valve physique. These vary from minor changes to extra advanced issues requiring detailed investigation. Understanding the potential causes and signs is paramount to efficient prognosis.
- Shifting Issues: Tough or delayed shifting, or a whole incapability to shift via the gears, can stem from varied valve physique points. These embody inside part put on, leaks within the hydraulic system, or issues with the stress management solenoids. Correct prognosis requires cautious evaluation of the shifting patterns and related signs.
- Fluid Leaks: Leaks from the valve physique can point out a spread of issues, from minor seal put on to extra extreme part injury. Leaks could end in a lack of transmission fluid, impacting the hydraulic system’s effectivity and resulting in shifting difficulties and potential overheating.
- Overheating: Elevated transmission temperatures usually level to inside friction, inadequate cooling, or a blockage throughout the valve physique’s cooling passages. This may be exacerbated by inadequate fluid ranges or a defective cooler. Immediate prognosis and corrective motion are important to stop catastrophic transmission failure.
Diagnostic Procedures
A scientific method to prognosis is important. Beginning with a radical inspection and progressing to extra superior diagnostic instruments is significant. Preliminary checks embody visible inspections for leaks, checking fluid ranges, and monitoring shifting traits.
- Visible Inspection: A visible inspection of the valve physique for leaks, particles, and weird put on patterns is commonly step one. Checking for any indicators of fluid leakage is essential, particularly round seals and connections.
- Fluid Evaluation: Analyzing the transmission fluid for contaminants, metallic particles, or irregular discoloration can present clues concerning the supply of the issue. The presence of steel particles, as an example, may recommend inside part put on.
- Diagnostic Instruments: Utilizing diagnostic instruments, like a transmission scanner, can present invaluable data on valve physique perform and the standing of varied solenoids. These instruments permit for detailed readings of stress and circulation information, offering deeper perception into the transmission’s operational parameters.
Comparability of Failure Modes
This desk summarizes varied failure modes of the Allison 1000 valve physique, their signs, and potential causes.
| Failure Mode | Typical Signs | Potential Causes | Diagnostic Method |
|---|---|---|---|
| Strain Management Solenoid Malfunction | Tough shifting, slipping, or problem partaking gears | Defective solenoid, wiring points, or low fluid stress | Confirm solenoid operation, test wiring connections, and ensure fluid stress |
| Inside Part Put on | Uncommon noise, tough shifting, and fluid leaks | Extreme put on on inside parts, corresponding to clutches or pistons | Examine for put on patterns on inside parts, assess fluid situation |
| Hydraulic System Leak | Decreased fluid ranges, shifting issues, and lowered transmission effectivity | Broken seals, hoses, or connections within the hydraulic system | Determine leak supply, change broken parts, and ensure correct fluid ranges |
| Cooling System Blockage | Elevated transmission temperature, overheating, and potential transmission injury | Blockages within the cooling passages or a defective cooler | Examine for blockages, assess cooling system effectivity, and test for cooler malfunctions |
Upkeep and Restore Procedures: Allison 1000 Transmission Valve Physique
Conserving your Allison 1000 transmission in tip-top form entails a proactive method to upkeep and a methodical restore course of. Common checks and well timed replacements of components are essential for extending the transmission’s lifespan and stopping pricey breakdowns. This part Artikels the advisable upkeep schedule and procedures for inspecting, changing, and overhauling the valve physique.
Really helpful Upkeep Schedule
A well-maintained Allison 1000 valve physique is a contented valve physique. Common inspections are key to catching potential points early. A preventative upkeep schedule, sometimes carried out each 50,000 miles or yearly, consists of visible checks for leaks, injury, or uncommon noises. Checking fluid ranges and situation, and guaranteeing correct filter alternative can be crucial. This proactive method minimizes pricey repairs down the street.
Inspecting and Changing Elements
Thorough inspection is step one in addressing any valve physique points. Rigorously look at all parts for put on, injury, or leaks. Begin by disassembling the valve physique, fastidiously documenting the preliminary state of every half. Use precision instruments and strategies to keep away from damaging delicate parts. When changing parts, guarantee they meet or exceed OEM specs.
Valve Physique Overhaul
An entire valve physique overhaul is a extra in depth process, sometimes carried out when important put on or injury is clear. The method entails eradicating the valve physique, cleansing all components, and inspecting for injury. Substitute of worn or broken components, together with a meticulous reassembly, is crucial. Every part have to be checked for correct perform and alignment earlier than reassembly.
An entire overhaul will restore the valve physique to its optimum efficiency.
Valve Physique Rebuild Process
This desk Artikels the steps in a valve physique rebuild, encompassing components alternative, testing, and verification.
| Step | Elements Substitute | Testing | Verification |
|---|---|---|---|
| 1 | Disassemble the valve physique, fastidiously documenting every part’s situation. | Visually examine all parts for put on or injury. | Verify correct half identification and amount. |
| 2 | Substitute worn or broken parts with new or remanufactured components, guaranteeing correct tolerances. | Check every part’s perform in keeping with specs. | Confirm that each one parts meet OEM specs. |
| 3 | Totally clear all parts utilizing acceptable solvents and strategies. | Conduct fluid stress and circulation assessments to make sure correct operation. | Verify the correct circulation charges and pressures of the hydraulic system. |
| 4 | Reassemble the valve physique, meticulously following the producer’s directions. | Confirm the right meeting of all parts and connections. | Guarantee all parts are correctly seated and aligned. |
| 5 | Set up the valve physique again into the transmission. | Run the engine and transmission via quite a lot of working circumstances. | Verify correct shifting and operational smoothness. |
Valve Physique Design and Operation
The Allison 1000 transmission valve physique is a marvel of engineering, meticulously crafted to handle the advanced interaction of hydraulic pressures and digital indicators that drive the automobile. Its design ensures easy, environment friendly gear shifting and optimum energy supply throughout varied working circumstances. Understanding its intricate workings is vital to sustaining and troubleshooting these refined transmissions.The valve physique acts because the central nervous system of the transmission, directing hydraulic fluid circulation to manage the clutches and bands.
Completely different circuits throughout the valve physique are particularly designed for varied working modes, from low-speed maneuvering to high-speed freeway driving. This intricate community of passages and parts ensures exact and well timed actuation of the transmission’s parts. This dialogue will discover the basic design ideas and operational traits of the Allison 1000 valve physique, emphasizing its distinctive options and interplay with the digital management system.
Design Rules
The Allison 1000 valve physique is constructed on a basis of precision engineering. Its design prioritizes sturdiness, effectivity, and flexibility to varied driving circumstances. Key design ideas embody optimized fluid circulation paths to attenuate stress drops and maximize responsiveness. Subtle sealing mechanisms are integrated to keep up the integrity of the hydraulic system, stopping leakage and guaranteeing constant efficiency.
Elements are strategically positioned to facilitate quick access for upkeep and restore, streamlining service procedures.
Management Circuits
The valve physique homes a number of management circuits, every devoted to a selected perform. The primary circuits embody these controlling shift speeds, stress limits, and temperature compensation. These circuits function in tandem to supply a easy and environment friendly transmission expertise. Correct operation of those circuits ensures the right gear choice and acceptable hydraulic pressures, stopping injury to the transmission parts.
- Shift Management Circuit: This circuit is answerable for initiating the shift course of. It makes use of a mix of solenoid valves and hydraulic stress to exactly management the engagement and disengagement of clutches and bands, guaranteeing easy gear modifications. The shift pace and high quality are decided by the sign from the valve physique to the clutches.
- Strain Management Circuit: This circuit screens and regulates hydraulic stress throughout the transmission. It maintains the suitable stress ranges for optimum operation, stopping extreme pressure on parts. Sensors within the circuit monitor and alter stress primarily based on the automobile’s working circumstances, guaranteeing environment friendly operation.
- Temperature Management Circuit: This circuit is significant for sustaining the correct working temperature of the transmission fluid. Temperature sensors consistently monitor the fluid temperature, and the valve physique responds by adjusting the circulation fee to keep up optimum temperature ranges. This prevents overheating and untimely put on of parts.
Digital Management System Interplay
In fashionable purposes, the Allison 1000 valve physique interacts with the automobile’s digital management unit (ECU). The ECU offers indicators to the valve physique, enabling refined management of shift scheduling, stress administration, and adaptive methods. This interplay permits the transmission to react dynamically to altering street circumstances and driver enter.
Hydraulic Operation Flowchart
(Substitute with an precise flowchart picture in an actual utility)The flowchart visualizes the sequence of hydraulic operations throughout the valve physique. It depicts how varied management indicators provoke the hydraulic actions, and the way the system screens and adjusts its actions primarily based on sensor inputs and driver instructions. It highlights the interplay between hydraulic stress, solenoid valve activation, and shift instructions. The exact circulation of hydraulic fluid and stress throughout the valve physique is essential for easy shifting and optimum efficiency. The diagram is a simplified illustration of the advanced course of.
Part Evaluation
Delving into the intricate coronary heart of the Allison 1000 transmission valve physique reveals a symphony of meticulously designed parts, every enjoying a vital position within the easy operation of this highly effective system. Understanding these parts and their interactions is paramount to profitable troubleshooting and upkeep. This evaluation will dissect the crucial components, inspecting their features, evaluating designs throughout fashions, and highlighting the importance of inside passages and circuits.The valve physique is basically a classy management heart, translating driver instructions into exact hydraulic actions throughout the transmission.
It acts because the conductor, orchestrating the interaction of varied parts to attain optimum efficiency and effectivity. This meticulous design permits for a variety of working circumstances, from on a regular basis driving to demanding off-road conditions.
Crucial Elements
The valve physique homes a community of interconnected parts. These parts, like tiny gears in a grand machine, decide the transmission’s conduct. Understanding their particular features is significant for efficient prognosis and restore.
- Management Valves: These valves are the first decision-makers, directing hydraulic stress to completely different components of the transmission primarily based on driver enter and automobile circumstances. They’re just like the site visitors controllers of the transmission, guaranteeing that fluid flows to the precise locations on the proper occasions. Completely different valve designs are utilized in varied Allison fashions, providing various responsiveness and management choices.
Subtle designs usually function a number of valve positions and stress changes to attain completely different gear ratios and modes of operation.
- Solenoid Pack: The solenoid pack is the muscle behind the valve physique’s actions. It makes use of electromagnets to activate and de-energize the management valves. This method permits for exact management of hydraulic stress, important for shifting gears easily. The design of the solenoid pack can fluctuate primarily based on the particular Allison mannequin, influencing the pace and precision of the shifting course of.
- Strain Sensors: These sensors constantly monitor the stress throughout the transmission system. They supply real-time suggestions to the management system, guaranteeing that stress ranges stay inside acceptable ranges. Variations in sensor design can affect the accuracy and responsiveness of the management system.
- Shifter Actuators: These actuators, like miniature pistons, translate the motive force’s shifting enter into bodily actions throughout the transmission. That is the bodily connection between the motive force’s enter and the interior workings of the transmission. The design of the shifter actuators usually displays the general design philosophy of the particular Allison mannequin.
Inside Passages and Circuits
The intricate community of passages and circuits throughout the valve physique is a masterpiece of engineering. These pathways meticulously information hydraulic fluid, enabling the exact management of the transmission’s actions. The exact dimensions and shapes of those passages are crucial, affecting circulation charges and stress distributions.
- Fluid Stream Channels: These channels are fastidiously sculpted to make sure environment friendly fluid motion to completely different parts. These channels are like exact plumbing, enabling the circulation of hydraulic fluid to the assorted parts throughout the transmission.
- Strain Reduction Valves: These valves act as security mechanisms, stopping extreme stress buildup. Their design and placement are crucial in sustaining the general integrity of the transmission system.
- Hydraulic Circuits: The circuits within the valve physique are interconnected, forming a posh system that ensures the exact management and timing of the transmission’s operation. These circuits are the spine of the transmission’s performance, directing fluid to the right parts and guaranteeing exact shifting.
Comparative Evaluation of Designs
Completely different Allison transmission fashions usually function variations in valve physique design, influencing their efficiency traits. These variations are pushed by issues like gasoline effectivity, energy output, and the particular working atmosphere.
| Mannequin | Valve Physique Design | Key Options |
|---|---|---|
| Allison 1000 Sequence (Mannequin A) | Compact, high-flow design | Optimized for gasoline effectivity and responsiveness in city environments. |
| Allison 1000 Sequence (Mannequin B) | Strong, heavy-duty design | Constructed for high-torque purposes and demanding off-road circumstances. |
| Allison 1000 Sequence (Mannequin C) | Superior, electronically managed design | Options adaptive management programs for optimized efficiency throughout various driving circumstances. |
Efficiency Traits
The Allison 1000 transmission valve physique is a crucial part, dictating the efficiency and longevity of the whole system. Its efficiency traits instantly affect gasoline effectivity, shifting smoothness, and total sturdiness. Understanding these traits is essential for each upkeep and troubleshooting.This part delves into the important thing efficiency traits of the Allison 1000 valve physique, exploring how working circumstances affect its perform and longevity.
We’ll look at the elements that have an effect on its reliability, and supply a comparative evaluation of various valve physique designs.
Shift High quality
The Allison 1000 valve physique’s shift high quality is a direct results of its refined hydraulic management system. Optimum shift high quality interprets to a seamless transition between gears, minimizing harshness and maximizing driver consolation. Exact management of fluid stress and circulation is paramount in reaching easy and fast shifts. Variations in working circumstances, corresponding to load, pace, and temperature, will affect the valve physique’s capability to ship constant shifts.
Effectivity
The effectivity of the Allison 1000 valve physique is intently tied to its capability to handle hydraulic stress and circulation. A well-tuned valve physique minimizes power loss, translating to improved gasoline financial system. Elements like valve design, fluid viscosity, and part put on instantly have an effect on the valve physique’s effectivity. Working the transmission at optimum temperatures and pressures is important to sustaining excessive effectivity.
Sturdiness
Sturdiness is a key side of the Allison 1000 valve physique. The valve physique should stand up to the pains of constant operation, together with excessive temperatures, stress fluctuations, and heavy masses. Materials choice, manufacturing precision, and correct upkeep procedures play a major position in extending the valve physique’s lifespan. Strong designs and cautious part choice contribute to the valve physique’s longevity.
Affect of Working Situations
Completely different working circumstances can considerably affect the valve physique’s efficiency. For instance, excessive ambient temperatures can enhance fluid viscosity, doubtlessly hindering easy shifting and reducing effectivity. Heavy masses, like towing, place larger calls for on the valve physique, doubtlessly accelerating put on. Driving kinds additionally affect efficiency. Aggressive driving usually results in extra frequent and forceful shifts, which might doubtlessly stress the valve physique parts.
Elements Influencing Longevity and Reliability
A number of elements contribute to the Allison 1000 valve physique’s longevity and reliability. Common upkeep, together with fluid modifications and filter replacements, is important. Correct working procedures, adhering to producer suggestions, are essential for stopping untimely put on. Utilizing high-quality parts and performing common inspections are equally necessary in guaranteeing the valve physique’s dependable operation. Avoiding harsh driving circumstances at any time when doable contributes to the valve physique’s lengthy life.
Comparative Evaluation of Valve Physique Designs
| Design | Gasoline Effectivity (mpg) | Shift Time (seconds) | Put on Resistance (cycles) |
|---|---|---|---|
| Design A | 25 | 3 | 150,000 |
| Design B | 27 | 2.5 | 180,000 |
| Design C | 26 | 2.8 | 175,000 |
This desk presents a comparative evaluation of various valve physique designs. The desk considers gasoline effectivity, shift time, and put on resistance, offering a glimpse into the efficiency trade-offs inherent in every design. Design B, as an example, provides a steadiness of gasoline effectivity and quick shifts, whereas design C offers barely longer put on resistance.
Options and Upgrades
The Allison 1000 transmission, a workhorse in heavy-duty purposes, can profit from varied upgrades and various designs. This part explores potential enhancements, evaluating their efficiency benefits and drawbacks, and outlining the required modifications. From enhancing sturdiness to optimizing gasoline effectivity, the precise improve can considerably affect the transmission’s total lifespan and operational excellence.Optimizing the Allison 1000 transmission for particular purposes may be achieved via cautious consideration of obtainable upgrades.
Modernizing parts can enhance effectivity and longevity, lowering upkeep prices and downtime. Understanding the professionals and cons of various choices permits knowledgeable choices for tailor-made options.
Potential Improve Choices
A number of modifications can be found to boost the Allison 1000 transmission, every providing distinctive benefits and challenges. These choices vary from easy part replacements to extra advanced system redesigns. The choice of which choice to implement is determined by the particular necessities and finances.
- Improved Valve Physique Design: A extra superior valve physique design can refine shift traits, resulting in smoother gear transitions and lowered put on on inside parts. This enhancement usually entails utilizing upgraded supplies, refined management mechanisms, and optimized hydraulic circuits. Improved valve physique designs may scale back working temperatures and enhance effectivity by minimizing inside friction.
- Enhanced Cooling System: The transmission’s cooling system performs a vital position in efficiency and longevity. An upgraded cooling system with bigger radiators, extra environment friendly followers, or a extra strategic fluid circulation sample can considerably scale back working temperatures, resulting in elevated reliability and efficiency, particularly in demanding environments. Overheating is a serious wrongdoer for transmission failures; upgraded cooling programs deal with this instantly.
- Superior Management Modules: Modernizing the management modules can optimize shift scheduling and alter for various working circumstances. This might contain upgrading the software program or using extra refined sensors for suggestions management. Superior management modules supply real-time changes to shift factors and hydraulic stress, enhancing effectivity and efficiency.
- Excessive-Power Elements: Using high-strength supplies in crucial parts, corresponding to gears, shafts, and housings, can improve the transmission’s load-carrying capability and total sturdiness. These modifications usually enhance the transmission’s resistance to put on and tear, extending its lifespan in high-stress purposes. Improved supplies and development can stand up to heavier masses and harsh circumstances, resulting in larger reliability.
Efficiency Comparability Desk
The desk beneath summarizes the potential advantages and disadvantages of various improve choices.
| Improve Possibility | Value | Efficiency Achieve | Complexity |
|---|---|---|---|
| Improved Valve Physique Design | Medium | Excessive (easy shifts, lowered put on) | Medium (modification of present parts) |
| Enhanced Cooling System | Low to Medium | Excessive (lowered working temperature) | Low to Medium (system integration) |
| Superior Management Modules | Excessive | Excessive (optimized shift schedules) | Excessive (software program and sensor integration) |
| Excessive-Power Elements | Excessive | Medium (elevated sturdiness) | Medium (part alternative) |
Troubleshooting Particular Points
Unveiling the mysteries of your Allison 1000 transmission valve physique could be a rewarding expertise. Troubleshooting widespread issues like slipping, exhausting shifting, or erratic shifting requires a scientific method, mixed with a eager understanding of the valve physique’s internal workings. This part offers a roadmap for tackling these challenges head-on.Understanding the valve physique’s intricate design is vital to diagnosing issues successfully.
The valve physique acts because the mind of the transmission, controlling fluid circulation and shifting factors. Issues come up when these crucial features are disrupted. This part will information you thru figuring out and resolving these disruptions.
Figuring out Slipping Points
Slipping, a irritating transmission ailment, usually manifests as a lack of energy throughout acceleration. It indicators a possible downside with the management circuits throughout the valve physique. A scientific prognosis entails checking for low fluid ranges, worn clutches, and potential inside valve malfunctions. Begin with the fundamentals—guarantee sufficient fluid ranges and situation, after which transfer to extra in-depth checks.
Diagnosing Exhausting Shifting
Exhausting shifting, characterised by a jarring or hesitant transition between gears, may be traced again to a number of sources throughout the valve physique. The stress management system could also be at fault, or there might be points with the shift solenoids. Checking solenoid operation and stress readings is essential. This systematic method will pinpoint the particular part answerable for the exhausting shifting.
Pinpointing Erratic Shifting
Erratic shifting, unpredictable gear modifications, is commonly a symptom of a posh interaction of things throughout the valve physique. Potential causes embody worn shift parts, defective stress sensors, or broken solenoids. Rigorously look at every of those potential downside areas to pinpoint the foundation trigger. A scientific method is vital. Visible inspection and diagnostic code evaluation are very important.
Decoding Diagnostic Codes
Diagnostic codes, usually displayed on a scan instrument, present invaluable insights into the particular points throughout the valve physique. Understanding these codes is important for focused troubleshooting. Completely different codes correspond to completely different issues, so cautious evaluation is essential. Codes associated to stress management, solenoid operation, and shift factors needs to be fastidiously examined to isolate the supply of the difficulty.
Systematic Isolation of the Drawback
Isolate the supply of the issue by systematically checking every part associated to shifting. This systematic method will information you thru the assorted steps concerned. Start with a visible inspection for apparent put on or injury. If visible inspection reveals no points, proceed to extra detailed assessments. A scientific method ensures you do not overlook potential issues.
Troubleshooting Situations and Examples, Allison 1000 transmission valve physique
| Symptom | Potential Causes | Diagnostic Steps |
|---|---|---|
| Slipping | Low fluid, worn clutches, valve physique inside injury | Test fluid degree and situation. Examine clutches for put on. Test valve physique for leaks and inside injury. |
| Exhausting Shifting | Defective solenoids, stress management points | Test solenoid operation. Confirm stress readings utilizing a scan instrument. Examine stress management valve for leaks. |
| Erratic Shifting | Worn shift parts, defective stress sensors, broken solenoids | Examine shift parts for put on. Test stress sensor readings. Check solenoid operation and voltage. |
