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Automatic Transaxle Diagnosis - 4T40-E & 4T45-E: Diagnosis Pontiac Sunfire I

Automatic Trans 39 illustrations ~19069 words

TROUBLE SHOOTING

Note. Any diagnosis should begin with confirming the customer's complaint. If possible, road test vehicle first, and note transaxle performance for future reference during diagnosis.

PRELIMINARY INSPECTION

Transaxle malfunctions may be caused by poor engine performance, improper adjustments or failure of hydraulic, mechanical or electronic components. Prior to diagnosing transaxle concerns, always begin by checking fluid level, fluid condition and shift cable adjustment. Ensure engine starts with gearshift lever in Park and Neutral to ensure proper adjustment of park/neutral position switch. Ensure all system-related fuses are okay. Check wire harnesses for proper routing. Verify all harness and component connections are clean and tight. See WIRING DIAGRAMS . If area of fault cannot be located or repaired during preliminary inspection, check self-diagnostic system. See SELF-DIAGNOSTIC SYSTEM . Repair as necessary.

Perform road test to determine if problem has been corrected. See ROAD TEST under PERFORMANCE TESTS. If problem still exists, diagnose by symptom. See SYMPTOM DIAGNOSIS .

SYMPTOM DIAGNOSIS

Note. Perform PRELIMINARY INSPECTION prior to diagnosing by symptom.

Note. Use the following symptoms to aid in preliminary diagnosis. (Scheme 90)- (Scheme 126). If a listed symptom matches the customer's concern, check the applicable items for possible cause.

Scheme 90

Scheme 90: SYMPTOM DIAGNOSIS
Scheme 90: SYMPTOM DIAGNOSIS

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Circuit Description

The diagnostic system check is an organized approach to identify a condition created by an automatic transaxle. The diagnostic system check is the diagnostic starting point for an automatic transaxle complaint. The diagnostic system check directs you to the next logical step for diagnosing a transaxle concern. Perform this check only if there is a driveability complaint or if you have been directed here from another service information section.

Diagnostic Procedure

Note. Check for applicable service bulletins before proceeding with this diagnostic procedure. Perform this diagnostic procedure only if there is a driveability complaint or if you have been directed to this diagnostic procedure from another section in the service information.

Note. Do not turn the ignition off when performing this diagnostic procedure. Do not clear the DTCs unless instructed by this diagnostic procedure.

  1. Turn ignition on, engine off. Does the scan tool turn on? If so, go to next step. If not, diagnose scan tool concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Is the MIL on? If so, go to next step. If not, diagnose MIL concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Attempt to establish communication with the PCM. Does the scan tool communicate with the PCM? If so, go to next step. If not, diagnose scan tool concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Use the scan tool CAPTURE INFO function to save or capture (store information) any DTC information. Are there any DTCs present? If so, see «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-155792-S40583079172003062500000) . If not, see «SYMPTOM DIAGNOSIS»(ref-155792-S27706543652003062500000) under TROUBLE SHOOTING.

Diagnostic Aids

Note. Do not clear the DTC unless directed by a diagnostic procedure. Clearing the DTC(s) will erase all freeze frame and failure records stored in PCM memory.

Note. Poor engine performance can sometimes be diagnosed as a transaxle driveability condition. To avoid mis-diagnosis of the automatic transaxle, always perform the powertrain on-board diagnostic system check.

Use a scan tool that is known to function correctly. If necessary, test the scan tool on another vehicle. Ensure the scan tool contains the most current file available. The scan tool will display a loss of communication error message under the following conditions

  1. The PCM power is interrupted.
  2. The ignition switch is turned off.
  3. The battery voltage level is very low.
  4. A poor connection at the Diagnostic Link Connector (DLC).

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Note. Only transaxle-related DTCs are listed. For engine-related DTC definitions, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. These DTCs pertain to engine performance and must be repaired first, as engine performance and related component signals will affect transaxle operation and diagnosis.

DTC (1)Definition
P0218Transaxle Overheating
P0502VSS Circuit Low Input
P0503VSS Circuit Performance
P0705TR Switch Circuit
P0711TFT Sensor Circuit Out Of Range
P0712TFT Sensor Circuit Low Input
P0713TFT Sensor Circuit High Input
P0716ISS Circuit Performance
P0717ISS Circuit No Signal
P0719Brake Switch Circuit Low Input
P0724Brake Switch Circuit High Input
P0730Incorrect Gear Ratio
P0741TCC Circuit Stuck Off
P0742TCC Circuit Stuck On
P0748PC Solenoid Electrical
P07511-2 Shift Solenoid Stuck Off
P07521-2 Shift Solenoid Stuck On
P07531-2 Shift Solenoid Electrical
P07562-3 Shift Solenoid Stuck On
P07572-3 Shift Solenoid Stuck Off
P07582-3 Shift Solenoid Electrical
P1810Pressure Switch Assembly Malfunction
P1811Maximum Adapt & Long Shift
P1815TFP Manual Valve Position Switch - Start In Wrong Range
P1816TFP Manual Valve Position Switch - Park/Neutral With Drive Ratio
P1817TFP Manual Valve Position Switch - Reverse With Drive Ratio
P1818TFP Manual Valve Position Switch - Drive Without Drive Ratio
P1860TCC PWM Solenoid Circuit Electrical
P1887TCC Release Switch Circuit
(1) Not all DTCs are applicable to all models.
(1)Not all DTCs are applicable to all models.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

CLEARING DIAGNOSTIC TROUBLE CODES

Using scan tool, clear DTCs following scan tool manufacturer's instructions. Do not clear DTCs unless instructed to do so.

Conditions For Running DTC

DTC will run under the following condition

  1. DTCs P0711, P0712 or P0713 are not present.

Conditions For Setting DTC

DTC will set under the following condition

  1. Transaxle temperature is more than 260°F (130°C) for 10 minutes.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Inspect the transaxle cooling system for air flow restrictions, air flow blockage, debris and damaged cooler lines. Repair as necessary. Did you find and correct a condition? If so, go to step 7 . If not, go to next step.
  4. Inspect the valve body for a stuck or leaking pressure regulator valve. Repair as necessary. Did you find and correct a condition? If so, go to step 7 . If not, go to next step.
  5. Inspect the oil feed tubes for restrictions and leaking seals. Repair as necessary. Did you find and correct a condition? If so, go to step 7 . If not, go to next step.
  6. Inspect the torque converter for stator damage. See appropriate OVERHAUL article. Did you find and correct the condition? If so, go to next step.
  7. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Start and idle the engine until it reaches normal operating temperature. Select ENGINE RUN TIME and TRANS. FLUID TEMP. on the scan tool. Drive the vehicle for 15 minutes. Ensure that the transmission fluid temperature has stabilized and is less than 264°F (129°C). Select SPECIFIC DTC. Enter DTC P0218. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Question owner for possible vehicle overloading, exceeding trailer towing limit or towing in Overdrive.

DTC will run under the following conditions

  1. No MAP sensor DTCs P0107 or P0108.
  2. No TP sensor DTCs P0121, P0122, or P0123.
  3. No ISS DTCs P0716 or P0717.
  4. No TFP manual valve position switch DTC P1810.
  5. The transaxle is in a drive range.
  6. The throttle angle is greater than 12 percent.
  7. The input speed is greater than 1500 RPM.
  8. The engine torque is greater than 50 ft. lbs. (68 N.m).

DTC will set under the following condition

  1. Output speed is less than 150 RPM for 3 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference. Clear DTC. Raise and support vehicle. Start engine and let it idle. Place gearshift lever in "D" position. With drive wheels rotating, does transaxle output speed increase when wheel speed increases? If so, see «DIAGNOSTIC AIDS»(ref-155792-S16232449562003062500000) . If not, go to next step.
  3. Turn ignition off. Disconnect PCM connectors. Connect DVOM set to AC scale between VSS high signal circuit and VSS low signal circuit terminals at appropriate PCM connector. Turn ignition on, engine off. Rotate right front drive wheel by hand, and observe DVOM. Is voltage more than .5 volt? If so, go to step 14 . If not, go to next step.
  4. Turn ignition off. Set DVOM to ohms while still connected to VSS terminals at PCM connectors. Is resistance 1530-1870 ohms? If so, go to step 8 . If not, go to next step.
  5. Is resistance more than 1870 ohms? If so, go to step 11 . If not, go to next step.
  6. Leave DVOM test leads connected to appropriate PCM connector. Disconnect VSS connector at transaxle. Is resistance less than 1530 ohms? If so, go to next step. If not, go to step 13 .
  7. Check for shorted together high and low signal circuits between PCM and VSS. Did you find and correct the condition? If so, go to step 15 .
  8. Check for short to ground in VSS high signal circuit between PCM and VSS. Did you find and correct the condition? If so, go to step 15 . If not, go to next step.
  9. Reconnect PCM connectors. Set DVOM to DC scale. Connect DVOM to VSS connector terminals. Turn ignition on, engine off. Does DVOM display system voltage? If so, go to next step. If not, go to step 12 .
  10. Check for short to voltage in VSS high signal circuit between PCM and VSS. Did you find and correct the condition? If so, go to step 15 .
  11. Check for open in VSS high and low signal circuits between PCM and VSS. Did you find and correct the condition? If so, go to step 15 . If not, go to step 13 .
  12. Check for incorrect speed sensor, sensor damage, excessive air gap between sensor and rotor, rotor damage or incorrect rotor alignment. Inspect for transaxle case damage. Repair or replace components as necessary. After repairs, go to step 15 .
  13. Replace VSS. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 15 .
  14. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  15. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Operate the vehicle and ensure output speed is greater than 250 RPM for 2 seconds. Select SPECIFIC DTC. Enter DTC P0502. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Condition may be intermittent. Check for loose speed sensor mounting or poor sensor connection. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change. Inspect for damaged speed sensor or transaxle rotor teeth.

DTC will run under the following conditions

  1. No TFP manual valve position switch DTC P1810.
  2. Time since gearshift lever change is more than 5 seconds.
  3. An increase in output speed of 250 RPM or more has not occurred for more than 5 seconds.
  4. The engine torque is 50 ft. lbs. (68 N.m) or greater.

DTC will set under the following conditions

  1. Output speed drops more than 1200 RPM for 3 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to DLC. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference. Clear DTC. Raise and support vehicle. Start engine and let it idle. Place gearshift lever in "D" position. With drive wheels rotating, does transaxle output speed increase when wheel speed increases? If so, see «DIAGNOSTIC AIDS»(ref-155792-S11781030602003062500000) . If not, go to next step.
  3. Turn ignition off. Disconnect PCM connectors. Connect DVOM set to AC scale between VSS high signal circuit and VSS low signal circuit terminals at appropriate PCM connector. Turn ignition on, engine off. Rotate right front drive wheel by hand, and observe DVOM. Can a voltage greater than .5 volt be obtained? If so, go to step 14 . If not, go to next step.
  4. Turn ignition off. Leave DVOM connected to VSS circuits at PCM connector and measure resistance of VSS circuit. Is circuit resistance 1530-1870 ohms? If so, go to step 8 . If not, go to next step.
  5. Is circuit resistance greater than 1870 ohms? If so, go to step 11 . If not, go to next step.
  6. Leave DVOM connected to appropriate PCM connector. Disconnect VSS connector at transaxle. Is circuit resistance less than 1530 ohms? If so, go to next step. If not, go to step 13 .
  7. Check for shorted together VSS high and low signal circuits between PCM and VSS. Did you find and correct the condition? If so, go to step 15 .
  8. Check for short to ground in VSS high signal circuit between PCM and VSS. Did you find and correct the condition? If so, go to step 15 . If not, go to next step.
  9. Reconnect PCM connectors. Set DVOM to DC scale. Connect DVOM to VSS connector terminals. Turn ignition on, engine off. Does DVOM display system voltage? If so, go to next step. If not, go to step 12 .
  10. Check for short to voltage in VSS high signal circuit between PCM and VSS. Did you find and correct the condition? If so, go to step 15 .
  11. Check for open in VSS high and low signal circuits between PCM and VSS. Did you find and correct the condition? If so, go to step 15 . If not, go to step 13 .
  12. Check for incorrect speed sensor, sensor damage, excessive air gap between sensor and rotor, rotor damage or incorrect rotor alignment. Inspect for transaxle case damage. Repair or replace components as necessary. After repairs, go to step 15 .
  13. Replace VSS. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 15 .
  14. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  15. After repair is complete, select DTC on scan tool. Select CLEAR INFO function. Select SPECIFIC DTC. Road test vehicle and ensure speed sensor is operating. If DTC P0503 is not present, repair is complete. If DTC P0503 is still present, go to step 1 .

Condition may be intermittent. Check for loose speed sensor mounting or poor sensor connection. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change. Inspect for damaged speed sensor or transaxle rotor teeth.

DTC will run under the following conditions

  1. System voltage is 8-18 volts.
  2. Engine run time is more than 5 seconds.
  3. Vehicle speed is more than 5 MPH.

DTC will set under the following condition

  1. The combination of TR signals is invalid for 5 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, observe TR switch display while moving gearshift lever through all positions. Does each selected gearshift lever position match scan tool display? If so, see «DIAGNOSTIC AIDS»(ref-155792-S40065195722003062500000) . If not, go to next step.
  3. Inspect the TR switch for damage, loose or missing mounting hardware, and proper adjustment. Inspect the shift cable for damage or improper adjustment. See ADJUSTMENTS in appropriate SERVICING article. Did you find and correct the condition? If so, go to step 16 . If not, go to next step.
  4. Using scan tool, observe the TR switch A/B/C/P display. Does the TR switch A/B/C/P display read HI for all ranges? If so, go to step 13 . If not, go to next step.
  5. Turn ignition off. Disconnect the TR switch 4-way connector. Turn ignition on. Using scan tool, observe the TR switch A/B/C/P display. Does TR switch A/B/C/P display read HI for all ranges? If so, go to next step. If not, go to step 10 .
  6. Measure voltage from TR switch 4-way connector terminals "A", "B", "C" and "D" to ground. Is voltage 10-12 volts at each terminal? If so, go to next step. If not, go to step 11 .
  7. Connect a fused jumper wire from TR switch 4-way connector terminal "D" (signal "A" circuit) to ground, while monitoring scan TR switch A/B/C/P parameter. When signal "A" circuit (771) is grounded, do any other signal circuits read LOW? If so, go to step 12 . If not, go to next step.
  8. Connect a fused jumper wire from TR switch 4-way connector terminal "B" (signal B circuit) to ground, while monitoring scan TR switch A/B/C/P parameter. When signal "B" circuit (772) is grounded, do any other signal circuits read LOW? If so, go to step 12 . If not, go to next step.
  9. Connect a fused jumper wire from TR switch 4-way connector terminal "C" (signal C circuit) to ground, while monitoring scan TR switch A/B/C/P parameter. When signal "C" circuit (773) is grounded, do any other signal circuits read LOW? If so, go to step 12 . If not, go to step 14 .
  10. Test the TR switch signal circuits that did not indicate HI for a short to ground. Did you find and correct the condition? If so, go to step 16 . If not, go to step 15 .
  11. Test the TR switch signal circuits that did not indicate proper voltage for an open. Did you find and correct the condition? If so, go to step 16 . If not, go to step 15 .
  12. Test the affected TR switch signal circuits for a shorted together condition. Did you find and correct the condition? If so, go to step 16 . If not, go to step 15 .
  13. Test the TR switch ground circuit (451) for an open. Did you find and correct the condition? If so, go to step 16 . If not, go to next step.
  14. Replace the TR switch. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 16 .
  15. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  16. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive vehicle. Select SPECIFIC DTC. Enter DTC P0705. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change. Inspect transaxle wiring harness for ATF.

DTC will run under the following conditions

  1. No VSS DTCs P0502 or P0503.
  2. No ISS DTCs P0716 or P0717.
  3. System voltage is 8-18 volts.
  4. Engine run time is greater than 5 minutes.
  5. Engine coolant temperature is greater than 158°F (70°C).
  6. Engine coolant temperature has changed by greater than 90°F (50°C) since start-up.
  7. Transmission fluid temperature at start-up is -40-70°F (-40-21°C).
  8. Vehicle speed is more than 5 MPH for 6 minutes and 49 seconds.
  9. TCC slip is more than 120 RPM for 6 minutes and 49 seconds.

DTC will set under one of the following conditions

  1. Change in transmission fluid temperature is less than 2°F (1.5°C) since start-up for 80 seconds, or change in transmission fluid temperature is greater than 36°F (20°C) within 200 milliseconds, 15 times within 7 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See LUBRICATION in appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Using scan tool, monitor transmission fluid temperature. Drive the vehicle and observe the scan tool for either of the following fail conditions: The transmission fluid temperature does not change greater than 2.7°F (1.5°C) in 80 seconds since start-up. The transmission fluid temperature changes greater than 36°F (20°C) in 200 milliseconds, 15 times within 7 seconds (an unrealistic change). Did either of the fail conditions occur? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S28196135002003062500000) .
  4. Did the scan tool display a condition in which the transmission fluid temperature does not change by more than 2.7°F (1.5°C) in 80 seconds since start-up? If so, go to step 6 . If not, go to next step.
  5. Turn ignition off. Disconnect transaxle 20-way connector. Install Jumper Harness (J-44152) on engine side of transaxle 20-way connector. Connect a test light between transaxle 20-way connector terminals "L" and "M". Turn ignition on, engine off. While observing scan tool display, wiggle wiring harness between transaxle 20-way connector and PCM connectors. Does transmission fluid temperature change by greater than 36°F (20°C)? If so, go to step 7 . If not, go to step 8 .
  6. Turn ignition off. Disconnect transaxle 20-way connector. Turn ignition on, engine off. Did the scan tool display a condition in which the transmission fluid temperature does not change by greater than 2.7°F (1.5°C) in 80 seconds since start-up? If so, go to step 11 . If not, go to step 10 .
  7. Check for intermittent open or short in TFT sensor signal and ground circuits between PCM and transaxle 20-way connector. Did you find and correct the condition? If so, go to step 12 . If not, go to step 11 .
  8. Check for intermittent open or short in TFT sensor signal and ground circuits between transaxle 20-way connector and TFP manual valve position switch. If open or short is found in TFT sensor signal or ground circuits, go to next step. If TFT sensor signal and ground circuits are okay, go to step 10 .
  9. Replace internal transaxle wire harness. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 12 .
  10. Replace TFP manual valve position switch. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 12 .
  11. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  12. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle and ensure the transmission fluid temperature changes by greater than 5°F (3°C) for 5 seconds since start-up. The transmission fluid temperature does not change by greater than 36°F (20°C) within 200 milliseconds, 15 times within 7 seconds. Select SPECIFIC DTC. Enter DTC P0711. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. Test TFT sensor at various temperature levels to evaluate possibility of a skewed (mis-scaled) sensor. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change. Inspect transaxle wiring harness for ATF.

DTC will run under the following conditions

  1. Ignition is on.
  2. System voltage is 8-18 volts.

DTC will set under the following condition

  1. TFT sensor voltage is less than .33 volt for 10 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Select TFT SENSOR on the scan tool. Does the scan tool display a TFT sensor voltage greater than 0.33 volt? If so, see «DIAGNOSTIC AIDS»(ref-155792-S23985722122003062500000) . If not, go to next step.
  3. Turn ignition off. Disconnect transaxle 20-way connector. Turn ignition on, engine off. Does scan tool display a transmission fluid temperature voltage greater than 4.92 volts? If so, go to step 5 . If not, go to next step.
  4. Check for short to ground in TFT sensor signal circuit between PCM and transaxle 20-way connector. Did you find and correct the condition? If so, go to step 11 . If not, go to step 10 .
  5. Install Jumper Harness (J-44152) to transaxle side of transaxle 20-way connector. Measure resistance between jumper harness terminals "L" and "M". Is the resistance 3106-3923 ohms at 68°F (20°C) and 164-190 ohms at 212°F (100°C)? If so, go to next step. If not, go to step 7 .
  6. Measure resistance between jumper harness terminal "L" and ground. Is resistance less than 1000 ohms? If so, go to step 9 . If not, see «DIAGNOSTIC AIDS»(ref-155792-S23985722122003062500000) .
  7. Disconnect TFP manual valve position switch from transaxle wiring harness. Measure resistance between jumper harness terminal "L" and all other jumper harness terminals. Is the resistance between terminal "L" and any other terminal less than 1000 ohms? If so, go to step 9 . If not, go to next step.
  8. Replace TFP manual valve position switch. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 11 .
  9. Replace transaxle internal wire harness. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 11 .
  10. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  11. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Operate the vehicle. Turn ignition on, engine off. The TFT sensor signal voltage must be greater than 0.33 volt for 10 seconds. Select SPECIFIC DTC. Enter DTC P0712. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. Ignition is on.
  2. System voltage is 8-18 volts.

DTC will set under the following conditions

  1. TFT sensor voltage is more than 4.9 volts for 6 minutes and 40 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Select TFT sensor on the scan tool. Does the scan tool display a TFT sensor voltage greater than 4.92 volts? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S00580523242003062500000) .
  3. Turn ignition off. Disconnect transaxle 20-way connector. Install Jumper Harness (J-44152) to transaxle side of transaxle 20-way connector. Measure resistance between jumper harness terminals "L" and "M". Is reading less than 100 k/ohms? If so, go to step 7 . If not, go to next step.
  4. Test TFT sensor signal circuit and TFT sensor ground circuit for an open between transaxle 20-way connector and the TFT sensor. Did you find an open condition? If so, go to step 8 . If not, go to next step.
  5. Measure resistance between jumper harness terminal "L" and all other jumper harness terminals. Is the resistance between terminal "L" and any other terminal less than the 1000 ohms? If so, go to step 10 . If not, go to next step.
  6. Test TFT sensor signal circuit for a short to voltage between PCM and the 20-way connector. Did you find and correct the condition? If so, go to step 12 . If not, go to step 9 .
  7. Test TFT sensor signal and ground circuits for an open between 20-way connector and PCM. Did you find and correct the condition? If so, go to step 12 . If not, go to step 11 .
  8. Replace transaxle internal wire harness. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 12 .
  9. Replace TFP manual valve position switch. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 12 .
  10. Replace transaxle internal wire harness and TFP manual valve position switch. See REMOVAL & INSTALLATION in appropriate SERVICING article. Go to step 12 .
  11. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  12. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Operate the vehicle. Turn ignition on, engine off. The TFT sensor signal voltage must be less than 4.92 volts for 6 minutes and 40 seconds. Select SPECIFIC DTC. Enter DTC P0713. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122 or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTC P0717.
  4. No 1-2 shift solenoid DTCs P0751, P0752 or P0753.
  5. No 2-3 shift solenoid DTC P0758.
  6. Engine is running.
  7. Throttle angle is greater than 15 percent.
  8. Vehicle speed is greater than 5 MPH.

DTC will set under the following condition

  1. The input speed changes by greater than 1300 RPM in .8 second.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Start the engine. Select ISS on the scan tool. Is the input speed greater than 500 RPM? If so, see «DIAGNOSTIC AIDS»(ref-155792-S24551133642003062500000) . If not, go to next step.
  3. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install Jumper Harness (J-44152) on the transaxle side of the transaxle 20-way connector. Measure the resistance between jumper harness terminals "S" and "V". Is the resistance 615-835 ohms? If so, go to step 7 . If not, go to next step.
  4. Is the resistance greater than 835 ohms? If so, go to next step. If not, go to step 6 .
  5. Test the ISS high and low signal circuits for a high resistance or an open between the transaxle 20-way connector and the ISS. Did you find a high resistance or open condition? If so, go to step 11 . If not, go to step 12 .
  6. Test the VSS high and low signal circuits for being shorted together between the transaxle 20-way connector and the ISS. Did you find the condition? If so, go to step 11 . If not, go to step 12 .
  7. Measure resistance between jumper harness terminal "S" and ground. Is the resistance less than 1000 ohms? If so, go to step 11 . If not, go to next step.
  8. Measure resistance between jumper harness terminal "S" and all other jumper harness terminals, except terminal "V". Is the resistance between terminal "S" and any other terminal, except terminal "V", less than 1000 ohms? If so, go to step 11 . If not, go to next step.
  9. Test the ISS high signal circuit for a high resistance, an open, a short to ground or a short to voltage between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 14 . If not, go to next step.
  10. Test the ISS low signal circuit for a high resistance or an open between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 14 . If not, go to step 13 .
  11. Replace the transaxle internal wire harness. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 14 .
  12. Replace the ISS. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 14 .
  13. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTCIS article in ENGINE PERFORMANCE. After repairs, go to next step.
  14. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Place the transaxle in Park. Start the engine. The input speed must be greater than 50 RPM without a speed change greater than 300 RPM within 0.3 second. Select SPECIFIC DTC. Enter DTC P0716. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No VSS DTCs P0502 or P0503.
  2. No TFP manual valve position switch DTC P1810.
  3. Engine is running.
  4. The TFP manual valve position switch indicates the vehicle is not in Park or Neutral.
  5. Vehicle speed is greater than 5 MPH.
  6. Engine torque is greater than 25 ft. lbs. (34 N.m).

DTC will set under the following condition

  1. Input speed is less than 100 RPM for 5 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Start the engine. Select ISS on the scan tool. Is the input speed greater than 500 RPM? If so, see «DIAGNOSTIC AIDS»(ref-155792-S14160822992003062500000) . If not, go to next step.
  3. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install Jumper Harness (J-44152) on the transaxle side of the transaxle 20-way connector. Measure the resistance between jumper harness terminals "S" and "V". Is the resistance 615-835 ohms? If so, go to step 7 . If not, go to next step.
  4. Is the resistance greater than 835 ohms? If so, go to next step. If not, go to step 6 .
  5. Test the ISS high and low signal circuits for a high resistance or an open between the transaxle 20-way connector and the ISS. Did you find a high resistance or open condition? If so, go to step 11 . If not, go to step 12 .
  6. Test the ISS high and low signal circuits for being shorted together between the transaxle 20-way connector and the ISS. Did you find the condition? If so, go to step 11 . If not, go to step 12 .
  7. Measure resistance between jumper harness terminal "S" and ground. Is the resistance less than 1000 ohms? If so, go to step 11 . If not, go to next step.
  8. Measure the resistance between jumper harness terminal "S" and all other jumper harness terminals, except terminal "V". Is the resistance between terminal "S" and any other terminal, except terminal "V", less than 1000 ohms? If so, go to step 11 . If not, go to next step.
  9. Test the ISS high signal circuit for a high resistance, an open, a short to ground or a short to voltage between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 14 . If not, go to next step.
  10. Test the ISS low signal circuit for a high resistance or an open between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 14 . If not, go to step 13 .
  11. Replace transaxle internal wire harness. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 14 .
  12. Replace input speed sensor. See REMOVAL & INSTALLATION in appropriate SERVICING article. After repairs, go to step 14 .
  13. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  14. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Place the transaxle in Park. Start the engine. The input speed must be greater than 450 RPM for 2 seconds. Select SPECIFIC DTC. Enter DTC P0717. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. Ignition is on.
  2. System voltage is 8-18 volts.

DTC will set under the following conditions

  1. Ignition is on.
  2. PCM detects an open brake switch circuit (zero volts) for 15 minutes and following conditions occur 8 consecutive times: Vehicle speed is less than 5 MPH, then vehicle speed is 5-20 MPH for 3 seconds, then vehicle speed is greater than 20 MPH for 6 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Select BRAKE SWITCH on the scan tool. Disconnect the brake switch connector. Install a fused jumper wire between brake switch connector terminals "A" and "B". Did the brake switch status change from OPEN to CLOSED? If so, go to step 5 . If not, go to next step.
  3. Inspect appropriate fuse for brake switch power feed circuit. Is the fuse open? If so, go to next step. If not, go to step 6 .
  4. Test brake switch power feed circuit for a short to ground. Repair as necessary. After repairs, go to step 9 .
  5. Inspect brake switch for proper adjustment. See ADJUSTMENTS in appropriate SHIFT INTERLOCK SYSTEMS article. Did brake switch require adjustment? If so, go to step 9 . If not, go to step 7 .
  6. Test brake switch power feed and input circuits for open. Did you find and correct the condition? If so, go to step 9 . If not, go to step 8 .
  7. Replace brake switch. See REMOVAL & INSTALLATION in appropriate SHIFT INTERLOCK SYSTEMS article. After repairs, go to step 9 .
  8. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  9. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Turn ignition on, engine off. Apply and release the brake pedal. The PCM must receive 12 volts (brake switch closed) on the circuit for 2 seconds. Select SPECIFIC DTC. Enter DTC P0719. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Ask customer about driving habits and/or unusual traffic conditions such as heavy stop and go driving. Check brake switch for proper adjustment. Inspect wiring for poor connections at PCM and at brake switch connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. Ignition is on.
  2. System voltage is 8-18 volts.

DTC will set under the following conditions

  1. PCM detects a closed brake switch circuit (12 volts) during deceleration and following conditions occur 8 consecutive times: Vehicle speed is greater than 20 MPH for 6 seconds, then vehicle speed is 5-20 MPH for 3 seconds, then vehicle speed is less than 5 MPH.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Select BRAKE SWITCH on the scan tool. Disconnect the brake switch connector. Does the brake switch status change from CLOSED to OPEN? If so, go to step 4 . If not, go to next step.
  3. Check for short to voltage in brake switch input circuit. Did you find and correct the condition? If so, go to step 6 . If not, go to step 5 .
  4. Replace brake switch. See REMOVAL & INSTALLATION in appropriate SHIFT INTERLOCK SYSTEMS article. After repairs, go to step 6 .
  5. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  6. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Turn ignition on, engine off. Apply the brake pedal for at least 3 seconds. Select SPECIFIC DTC. Enter DTC P0724. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Ask customer about driving habits and/or unusual traffic conditions such as heavy stop and go driving. Check brake switch for proper adjustment. Inspect wiring for poor connections at PCM and at brake switch connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122 or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTCs P0716 or P0717.
  4. No TFP manual valve position switch DTC P1810.
  5. Engine is running.
  6. TFP manual valve position switch is not indicating Park or Neutral.
  7. The time since the gear select lever change is greater than 6 seconds.
  8. The transmission fluid temperature is greater than 68°F (20°C).
  9. The throttle position is greater than 15 percent.
  10. Vehicle speed is more than 5 MPH.
  11. Engine torque is greater than 50 ft. lbs. (68 N.m).

DTC will set when one of the following conditions occurs for 7 seconds

  1. Gear ratio is more than 3.13:1.
  2. Gear ratio is 2.23:1-2.87:1.
  3. Gear ratio is 1.71:1-2.02:1.
  4. Gear ratio is 1.07:1-1.54:1.
  5. Gear ratio is .72:1-.91:1.
  6. Gear ratio is less than .61:1.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Visually inspect transaxle cooling system for fluid leaks. Repair as necessary. After repairs, go to step 8 . If no leaks are found, go to next step.
  3. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See LUBRICATION in appropriate SERVICING article.
  4. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Use the scan tool snapshot mode to record the transaxle gear ratios. Drive the vehicle in gear ranges "1", "2", "3", and "D" with the throttle angle greater than 15 percent, and the vehicle speed greater than 5 MPH. Record each gear. Did the gear ratio match the specified ranges? Reverse - 2.02:1-2.23:1 1st - 2.87:1-3.13:1 2nd - 1.54:1-1.71:1 3rd - 0.91:1-1.07:1 4th - 0.61:1-0.72:1 If so, see «DIAGNOSTIC AIDS»(ref-155792-S11106144472003062500000) . If not, go to next step.
  5. Perform line pressure test. See «HYDRAULIC PRESSURE TESTS»(ref-155792-S09367307862003062500000) under PERFORMANCE TESTS. After test, go to next step.
  6. Check for excessive clutch wear and repair as necessary. See appropriate OVERHAUL article. After repairs, go to next step.
  7. Change transaxle fluid and filter. Inspect transaxle fluid for correct level. Add new fluid as necessary. Use scan tool to perform clear TAPS function.
  8. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with the throttle angle greater than 15 percent to obtain any one of the following gear ratios for 7 seconds: Reverse - 2.02:1-2.23:1 1st - 2.87:1-3.13:1 2nd - 1.54:1-1.71:1 3rd - 0.91:1-1.07:1 4th - 0.61:1-0.72:1 Select SPECIFIC DTC. Enter DTC P0730. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Check for intermittent input speed sensor or vehicle speed sensor circuit problems, or for possible incorrect calibration.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122 or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No TCC stuck on DTC P0742.
  4. No TFP manual valve position switch DTC P1810.
  5. The time since the gearshift lever change is greater than 6 seconds.
  6. Throttle angle is 8-75 percent.
  7. Transmission fluid temperature is 68-266°F (20-130°C).
  8. Transaxle Fluid Pressure (TFP) manual valve position switch indicates "2", "3" or "D" position.
  9. PCM commands TCC on for greater than 3 seconds.

DTC will set under the following condition

  1. The TCC slip speed is greater than 200 RPM for 6 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See LUBRICATION in appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Drive the vehicle at 45 MPH. Using the scan tool, command the TCC PWM solenoid valve on. Monitor the TCC slip speed. Is the slip speed less than 50 RPM? If so, see «DIAGNOSTIC AIDS»(ref-155792-S13220850682003062500000) . If not, go to next step.
  4. Drive the vehicle at 45 MPH. Using the scan tool, command the TCC PWM solenoid valve on. Monitor the TCC DUTY CYCLE SHORT TO VOLTS parameter. Does the TCC DUTY CYCLE SHORT TO VOLTS parameter indicate a short to voltage when the TCC is commanded on? If so, go to step 8 of DTC P1860: TCC PWM SOLENOID CIRCUIT ELECTRICAL. If not, go to next step.
  5. Inspect for the following conditions: TCC PMW solenoid "O" ring for leaks. TCC PMW solenoid valve filter restriction. Stuck TCC control valve. Stuck TCC regulated apply valve. TCC feed limit valve, binding or stuck due to sediment. Pressure regulator valve, binding or stuck due to sediment. TCC fluid circuits for leaks. Turbine shaft seals for leaks. Repair as necessary. After repairs, go to next step.
  6. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position and the throttle angle greater than 8 percent. Obtain 45 MPH. With the TCC commanded on and engaged, the slip speed must be less than 50 RPM for 4 seconds. Select SPECIFIC DTC. Enter DTC P0741. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect transmission fluid level. Transaxle may be in hot mode. Inspect transaxle cooler lines to radiator. Lines may be pinched, plugged or twisted.

DTC will run under the following conditions

  1. No TP DTCs P0121, P0122 or P0123.
  2. No TCC release switch DTC P1887.
  3. Engine is running.
  4. Throttle angle is greater than 12 percent.
  5. TCC is commanded off.

DTC will set under the following condition

  1. The TCC release switch is closed, release fluid pressure not present, for 4 seconds, 4 times during the same trip.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Select TCC RELEASE PRESSURE on the scan tool. Start the engine. Does the scan tool indicate TCC release pressure is present? If so, go to step 7 . If not, go to next step.
  3. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Turn ignition on, engine off. Does the scan tool indicate TCC release pressure is present? If so, go to step 5 . If not, go to next step.
  4. Test the TCC release switch signal circuit for a short to ground between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 11 . If not, go to step 10 .
  5. Test the TCC release switch signal circuit for a short to ground between the transaxle 20-way connector and the TFP manual valve position switch. Did you find the condition? If so, go to step 9 . If not, go to next step.
  6. Remove the TFP manual valve position switch. See appropriate SERVICING article. Inspect the TCC release switch for a damaged or leaking seal, sediment or debris in the switch, damaged switch contacts or stuck switch contacts. Did you find a condition? If so, go to step 8 . If not, go to next step.
  7. Inspect for the following conditions: The TCC PWM solenoid valve for the fluid exhaust being restricted. The TCC regulated apply valve for being stuck in the TCC apply position. The TCC control valve for being stuck in the TCC apply position. The TCC feed limit valve for being stuck. This causes the TCC feed limit pressure, and the TCC release pressure to be low or nonexistent. The pressure regulator valve for being stuck. The TCC fluid circuits for leaks. Abnormally high or low line pressure. Repair any of the above conditions as necessary. Did you find and correct a condition? If so, go to step 11 . If not, see «DIAGNOSTIC AIDS»(ref-155792-S32675175442003062500000) .
  8. Replace the TFP manual valve position switch. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 11 .
  9. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 11 .
  10. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  11. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Start the engine. TCC release pressure must be present for 3 seconds. Select SPECIFIC DTC. Enter DTC P0742. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Rapid fluctuation in line pressure could set DTC P0742. Check for pressure regulator malfunction and low or high line pressure. Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. Customer may notice an engine stalling condition. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following condition

  1. System voltage is 8-18 volts.

DTC will set under the following condition

  1. PC solenoid duty cycle is zero percent or greater than 95 percent.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Start the engine. Using the scan tool, apply 0.1 amp through 1.0 amps. Observe the scan tool display. Does the PC SOL. ACTUAL CURRENT amp reading differ from the PC SOL. REF. CURRENT amp reading by no more than 0.16 amp? If so, see «DIAGNOSTIC AIDS»(ref-155792-S04873562252003062500000) . If not, go to next step.
  3. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install Jumper Harness (J-44152) on the transaxle side of the transaxle 20-way connector. Measure the resistance between jumper harness terminals "C" and "D". Is the resistance 3-7 ohms? If so, go to step 7 . If not, go to next step.
  4. Is the resistance between jumper harness terminals "C" and "D" greater than 7 ohms? If so, go to next step. If not, go to step 6 .
  5. Test the PC solenoid high and low circuits for an open between the transaxle 20-way connector and the PC solenoid. Did you find a condition? If so, go to step 18 . If not, go to step 19 .
  6. Test the PC solenoid high and low circuits for being shorted together between the transaxle 20-way connector and the PC solenoid. Did you find a condition? If so, go to step 18 . If not, go to step 19 .
  7. Measure the resistance from jumper harness terminal "C" to ground. Is the resistance less than 1000 ohms? If so, go to next step. If not, go to step 9 .
  8. Test the PC solenoid high and low circuits for a short to ground between the transaxle 20-way connector and the PC solenoid. Did you find a condition? If so, go to step 18 . If not, go to step 19 .
  9. Measure the resistance between jumper harness terminal "C" and all other jumper harness terminals, except terminal "D". Is the resistance between terminal "C" and any other terminal, except terminal "D", less than 10 ohms? If so, go to step 18 . If not, go to next step.
  10. Disconnect the jumper harness from the transaxle side of the transaxle 20-way connector. Install the jumper harness on the engine side of the transaxle 20-way connector. Disconnect PCM connector C2. Additional DTCs may set. Measure the resistance from jumper harness terminal "D" to ground. Is the resistance less than 10 ohms? If so, go to next step. If not, go to step 12 .
  11. Test the PC solenoid low circuit for a short to ground between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 21 .
  12. Measure the resistance of PC solenoid low circuit between jumper harness terminal "D" and appropriate terminal of PCM connector C2. Is the resistance less than 10 ohms? If so, go to step 14 . If not, go to next step.
  13. Test the PC solenoid low circuit for an open between the PCM connector C2 and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 21 .
  14. Measure the resistance from jumper harness terminal "C" to ground. Is the resistance less than 10 ohms? If so, go to next step. If not, go to step 16 .
  15. Test the PC solenoid high circuit for a short to ground between the PCM connector C2 and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 21 .
  16. Measure the resistance of the PC solenoid high circuit between jumper harness terminal "C" and appropriate terminal of PCM connector C2. Is the resistance less than 10 ohms? If so, go to step 20 . If not, go to next step.
  17. Test the PC solenoid high circuit for an open between the PCM connector C2 and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 21 .
  18. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 21 .
  19. Replace the PC solenoid valve. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 21 .
  20. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  21. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Turn ignition on, engine off. Select SPECIFIC DTC. Enter DTC P0748. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. Extended engine cranking with a weak battery could set DTC P0748. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122, or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTCs P0716 or P0717.
  4. No shift solenoid electrical DTCs P0753 or P0758.
  5. No TFP manual valve position switch DTC P1810.
  6. The system voltage is 8-18 volts.
  7. Engine is running.
  8. TFP manual valve position switch is not in Park, Reverse or Neutral.
  9. Transmission fluid temperature is greater than 70°F (21°C).
  10. Throttle angle is greater than 8 percent.
  11. Vehicle speed is greater than 5 MPH.

The following occurs twice during the same trip

  1. PCM commands 1st gear and gear ratio is between 1.54-1.71 (2nd gear) for 4 seconds.
  2. PCM commands 4th gear and gear ratio is between .91-1.07 (3rd gear) for 4 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Use the scan tool snapshot mode to record current gear and gear ratio. Drive the vehicle to obtain 1-2, 2-3 and 3-4 shifts with a throttle angle greater than 8 percent. Are the current gear and gear ratio 1st/2nd = 1.54:1-1.71:1 and 3rd/4th = 0.91:1-1.07:1? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S27876930182003062500000) .
  4. Inspect the 1-2 shift circuit for the following conditions: 1-2 shift solenoid valve mechanically stuck off. Damaged 1-2 shift solenoid valve "O" ring. 1-2 shift valve stuck in the released position. Repair the circuit as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to next step.
  5. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Allow the transaxle to shift through all gears. Monitor the current gear and gear ratios. The actual gear ratios must match the commanded gears for 0.75 second, for all gears. Select SPECIFIC DTC. Enter DTC P0751. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Check for stuck throttle position sensor. If DTC P0751 cannot be reset after clearing DTC, check for possible fluid contamination or plugged or restricted oil circuits.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122, or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTCs P0716 or P0717.
  4. No shift solenoid electrical DTCs P0753 or P0758.
  5. No TFP manual valve position switch DTC P1810.
  6. The system voltage is 8-18 volts.
  7. Engine is running.
  8. TFP manual valve position switch is not indicating Park, Reverse or Neutral.
  9. Transmission fluid temperature is more than 70°F (21°C).
  10. Throttle angle is more than 8 percent.
  11. Vehicle speed is more than 5 MPH.

The following occurs twice during the same trip

  1. PCM commands 2nd gear and gear ratio is 2.87:1-3.13:1 (1st gear) for 4 seconds.
  2. PCM commands 3rd gear and gear ratio is 0.61:1-0.72:1 (4th gear) for 4 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Use the scan tool snapshot mode to record current gear and gear ratio. Drive the vehicle with gearshift lever in "D" position to obtain 1-2, 2-3 and 3-4 shifts with a throttle angle greater than 8 percent. Are current gear and gear ratio 1st/2nd = 2.87:1-3.13:1 and 3rd/4th = 0:61:1-0.72:1? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S10513316312003062500000) .
  4. Inspect the 1-2 shift circuit for 1-2 shift solenoid valve mechanically stuck on and 1-2 shift valve stuck in the applied position. Repair the circuit as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to next step.
  5. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Allow the transaxle to shift through all the gears. Monitor the current gear and gear ratios. The actual gear ratios must match the commanded gears for 0.75 second, for all gears. Select SPECIFIC DTC. Enter DTC P0752. Has the test run and passed? If so, system is okay. If not, go to step 1 .

If DTC P0752 cannot be reset after clearing DTC, check for possible fluid contamination or plugged or restricted oil circuits.

DTC will run under the following conditions

  1. Ignition is on.
  2. System voltage is 8-18 volts.

DTC will set under the following conditions

  1. PCM commands solenoid on and voltage remains high (battery voltage) for 4.3 seconds.
  2. PCM commands solenoid off and voltage remains low (zero volts) for 4.3 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Is DTC P0758 or P1860 also set? If so, go to next step. If not, go to step 8 .
  3. Remove ERLS fuse 10-amp ("J" body) from instrument panel fuse block or AUTO TRANS fuse ("N" body) from underhood fuse block and inspect fuse. Replace fuse if necessary. If fuse was open, go to next step. If fuse is okay, go to step 6 .
  4. Test the 1-2 shift solenoid power feed circuit for a short to ground between the fuse block and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  5. Test the 1-2 shift solenoid valve power feed circuit for short to ground between transaxle 20-way connector and 1-2 shift solenoid. Did you find the condition? If so, go to step 23 .
  6. Test the 1-2 shift solenoid valve power feed circuit for an open between the fuse block and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  7. Test the 1-2 shift solenoid valve power feed circuit for an open between the transaxle 20-way connector and the 1-2 shift solenoid valve. Did you find the condition? If so, go to step 23 .
  8. Use the scan tool to command the 1-2 shift solenoid valve on and off 3 times. Listen at the transaxle side cover. Does the solenoid click when commanded on and off? If so, see «DIAGNOSTIC AIDS»(ref-155792-S41709531522003062500000) . If not, go to next step.
  9. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install the Jumper Harness (J-44152) on the engine side of the transaxle 20-way connector. Connect a test light between jumper harness terminals "E" and "A". Turn ignition on, engine off. Command the 1-2 shift solenoid valve on and off three times. Is the test light on when you command the solenoid on, and off when you command the solenoid off? If so, go to step 17 . If not, go to next step.
  10. Is the test light always on? If so, go to next step. If not, go to step 13 .
  11. Turn ignition off. Disconnect PCM connector C2 on 2.2L and 2.4L models, or connector C1 on 3.1L and 3.4L models. Additional DTCs may set. Turn ignition on, engine off. Is the test light on? If so, go to next step. If not, go to step 25 .
  12. Test the 1-2 shift solenoid valve control circuit for a short to ground between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 .
  13. Is the test light always off? If so, go to next step.
  14. Test the 1-2 shift solenoid control circuit for an open between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  15. Connect a test light from jumper harness terminal "A" to ground. Is the test light on? If so, go to next step. If not, go to step 25 .
  16. Test the 1-2 shift solenoid valve control circuit for a short to voltage between the PCM and the transaxle 20-way connector. Repair as necessary. After repairs, go to step 26 .
  17. Turn ignition off. Disconnect the jumper harness from the engine side of the transaxle 20-way connector. Install the jumper harness on the transaxle side of the transaxle 20-way connector. Measure the resistance between jumper harness terminals "E" and "A". Is the resistance 19-31 ohms? If so, go to step 20 . If not, go to next step.
  18. Is the resistance greater than 31 ohms? If so, go to next step. If not, go to step 20 .
  19. Test the 1-2 shift solenoid valve control circuit for an open between the transaxle 20-way connector and the 1-2 shift solenoid valve. Test the 1-2 shift solenoid valve power feed circuit for an open between the transaxle 20-way connector and the 1-2 shift solenoid valve. Did you find a condition? If so, go to step 23 . If not, go to step 24 .
  20. Measure the resistance from jumper harness terminal "A" to ground. Is the resistance less than 1000 ohms? If so, go to next step. If not, go to step 22 .
  21. Test the 1-2 shift solenoid valve control circuit for a short to ground between the transaxle 20-way connector and the 1-2 shift solenoid valve. Did you find the condition? If so, go to step 23 .
  22. Measure the resistance between jumper harness terminal "A" and all other jumper harness terminals, except terminals "B", "E" and "T". Is the resistance between terminal "A" and any other terminal, except terminal "B", "E" and "T", less than 1000 ohms? If so, go to next step. If not, go to step 24 .
  23. Replace the transaxle internal wiring harness. See appropriate SERVICING article. After repairs, go to step 26 .
  24. Replace the 1-2 shift solenoid valve. See appropriate SERVICING article. After repairs, go to step 26 .
  25. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  26. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Allow the transaxle to obtain a 1-2, 2-3, and 3-4 upshift. Select SPECIFIC DTC. Enter DTC P0753. Has the test run and passed? If so, system is okay. If not, go to step 1 .

An open in circuit wire between transaxle 20-way connector and fuse can cause multiple DTCs to set. Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122 or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTCs P0716 or P0717.
  4. No shift solenoid electrical DTCs P0753 or P0758.
  5. No engine torque DTC P1644.
  6. No TFP manual valve position switch DTC P1810.
  7. The system voltage is 8-18 volts.
  8. Engine is running.
  9. The TFP manual valve position switch is not indicating Park, Reverse, or Neutral.
  10. Transmission fluid temperature is greater than 70°F (21°C).
  11. Vehicle speed is greater than 5 MPH.
  12. Throttle angle is greater than 8 percent.
  13. The engine torque is greater than 20 ft. lbs. (27 N.m).

All conditions exist when any one of the following conditions occur

  1. The PCM commands 1st gear and the gear ratio is 0.61:1-0.72:1 (4th gear) for 4 seconds.
  2. The PCM commands 2nd gear and the gear ratio is 0.91:1-1.07:1 (3rd gear) for 4 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Use the scan tool snapshot mode to record current gear and gear ratio. Drive the vehicle with gearshift lever in "D" position to obtain 1-2, 2-3 and 3-4 shifts with a throttle angle greater than 8 percent. Are current gear and gear ratio 1st/4th = 0.61:1-0.72:1 and 2nd/3rd = 0.91:1-1.07:1? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S33488463832003062500000) .
  4. Inspect the 2-3 shift circuit for 2-3 shift solenoid valve mechanically stuck on or 2-3 shift valve stuck in the applied position. Repair the circuit as necessary. After repairs, go to next step.
  5. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Allow the transaxle to shift through all the gears. Monitor the current gear and gear ratios. The actual gear ratios must match the commanded gears for 0.75 second, for all gears. Select SPECIFIC DTC. Enter DTC P0756. Has the test run and passed? If so, system is okay. If not, go to step 1 .

If DTC P0756 cannot be reset after clearing DTC, check for possible fluid contamination or plugged or restricted oil circuit.

DTC will run under the following conditions

  1. No TP sensor DTCs P0121, P0122 or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTCs P0716 or P0717.
  4. No shift solenoid electrical DTCs P0753 or P0758.
  5. No engine torque DTC P1644.
  6. No TFP manual valve position switch DTC P1810.
  7. The system voltage is 8-18 volts.
  8. Engine is running.
  9. The TFP manual valve position switch is not indicating Park, Reverse, or Neutral.
  10. Transmission fluid temperature is greater than 70°F (21°C).
  11. The input speed is greater than 150 RPM.
  12. Vehicle speed is greater than 5 MPH.
  13. Throttle angle is greater than 8 percent.

DTC will set when one of the following conditions occur

  1. The PCM commands 3rd gear and the gear ratio is 1.54:1-1.71:1 (2nd gear) for 3 seconds.
  2. The PCM commands 4th gear and the gear ratio is 2.87:1-3.13:1 (1st gear) for 2 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Use the scan tool snapshot mode to record current gear and gear ratio. Drive the vehicle with gearshift lever in "D" position to obtain 1-2, 2-3 and 3-4 shifts with a throttle angle greater than 8 percent. Are current gear and gear ratio 1st/4th = 2.87:1-3.13:1 and 2nd/3rd = 1.54:1-1.71:1? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S37814258312003062500000) .
  4. Inspect the 2-3 shift circuit for 2-3 shift solenoid valve mechanically stuck off, damaged 2-3 shift solenoid valve "O" ring or 2-3 shift valve stuck in the released position. Repair the circuit as necessary. After repairs, go to next step.
  5. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Allow the transaxle to shift through all the gears. Monitor the current gear and gear ratios. The actual gear ratios must match the commanded gears for 0.75 second, for all gears. Select SPECIFIC DTC. Enter DTC P0757. Has the test run and passed? If so, system is okay. If not, go to step 1 .

If DTC P0757 cannot be reset after clearing DTC, check for possible fluid contamination or plugged or restricted oil circuit.

DTC will run under the following conditions

  1. Ignition is on.
  2. System voltage is 8-18 volts.

DTC will set under the following conditions

  1. PCM commands solenoid on and voltage remains high for 4.3 seconds.
  2. PCM commands solenoid off and voltage remains low for 4.3 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Is DTC P0753 or P1860 also set? If so, go to next step. If not, go to step 8 .
  3. Remove the power feed fuse for the 2-3 shift solenoid. Inspect the fuse for an open. Did you find the condition? If so, go to next step. If not, go to step 6 .
  4. Test the 2-3 shift solenoid valve power feed circuit for a short to ground between the fuse block and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  5. Test the 2-3 shift solenoid valve power feed circuit for a short to ground between the transaxle 20-way connector and the 2-3 shift solenoid valve. Did you find the condition? If so, go to step 23 .
  6. Test the 2-3 shift solenoid valve power feed circuit for an open between the fuse block and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  7. Test the 2-3 shift solenoid valve power feed circuit for an open between the transaxle 20-way connector and the 2-3 shift solenoid valve. Did you find the condition? If so, go to step 23 .
  8. Use the scan tool to command the 2-3 shift solenoid valve on and off 3 times. Listen at the transaxle side cover. Does the solenoid click when commanded on and off? If so, see «DIAGNOSTIC AIDS»(ref-155792-S13740985812003062500000) . If not, go to next step.
  9. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install Jumper Harness (J-44152) on the engine side of the transaxle 20-way connector. Connect a test light between jumper harness terminal "E" and "B". Turn ignition on, engine off. Command the 2-3 shift solenoid valve on and off three times. Is the test light on when you command the solenoid on, and off when you command the solenoid off? If so, go to step 17 . If not, go to next step.
  10. Is the test light always on? If so, go to next step. If not, go to step 13 .
  11. Turn ignition off. Disconnect PCM connector C2 on 2.2L and 2.4L models, or connector C1 on 3.1L and 3.4L models. Additional DTCs may set. Turn ignition on, engine off. Is the test light on? If so, go to next step. If not, go to step 25 .
  12. Test the 2-3 shift solenoid valve control circuit for a short to ground between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 .
  13. Is the test light always off? If so, go to next step.
  14. Test the 2-3 shift solenoid valve control circuit for an open between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  15. Connect a test light from jumper harness terminal "B" to ground. Is the test light on? If so, go to next step. If not, go to step 25 .
  16. Test the 2-3 shift solenoid valve control circuit for a short to voltage between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 26 .
  17. Turn ignition off. Disconnect the jumper harness from the engine side of the transaxle 20-way connector. Install the jumper harness on the transaxle side of the transaxle 20-way connector. Measure the resistance between jumper harness terminals "E" and "B". Is the resistance 19-31 ohms? If so, go to step 20 . If not, go to next step.
  18. Is the resistance greater than 31 ohms? If so, go to next step. If not, go to step 20 .
  19. Test the 2-3 shift solenoid valve control circuit for an open between the transaxle 20-way connector and the 2-3 shift solenoid valve. Test the 2-3 shift solenoid power feed circuit for an open between the transaxle 20-way connector and the 2-3 shift solenoid valve. Did you find a condition? If so, go to step 23 . If not, go to step 24 .
  20. Measure the resistance from jumper harness terminal "B" to ground. Is the resistance less than 1000 ohms? If so, go to next step. If not, go to step 22 .
  21. Test the 2-3 shift solenoid control circuit for a short to ground between the transaxle 20-way connector and the 2-3 shift solenoid valve. Did you find the condition? If so, go to step 23 .
  22. Measure the resistance between jumper harness terminal "B" and all other jumper harness terminals, except terminal "A", "E" and "T". Is the resistance between terminal "B" and any other terminal, except terminal "A", "E" and "T", less than 1000 ohms? If so, go to next step. If not, go to step 24 .
  23. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 26 .
  24. Replace the 2-3 shift solenoid valve. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 26 .
  25. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  26. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Allow the transaxle to obtain a 1-2, 2-3 and 3-4 upshift. Select SPECIFIC DTC. Enter DTC P0758. Has the test run and passed? If so, system is okay. If not, go to step 1 .

An open in power feed circuit between shift solenoid and fuse can cause multiple DTCs to set. Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

  1. Engine is running.
  2. System voltage is 8-18 volts.

Condition No. 1 For Setting DTC

Note. The DTC will set under one of the following three conditions.

Gear range is invalid for 60 seconds. See TFP MANUAL VALVE POSITION SWITCH ASSEMBLY LOGIC table under DESCRIPTION & OPERATION.

Condition No. 2 For Setting DTC

  1. No VSS DTCs P0502 or P0503.
  2. The engine speed is in transition from zero RPM to greater than 600 RPM.
  3. The vehicle speed is less than 2 MPH.
  4. "D2", "D4" or Reverse is indicated after start-up for 2 seconds.

Condition No. 3 For Setting DTC

  1. No TP sensor DTCs P0121, P0122, or P0123.
  2. No VSS DTCs P0502 or P0503.
  3. No ISS DTCs P0716 or P0717.
  4. No shift solenoid DTCs P0751, P0752, P0753, P0756, P0757 or P0758.
  5. The TP sensor is 10-25 percent.
  6. The vehicle speed is 5 MPH or greater.
  7. The engine torque is 10 ft. lbs. (14 N.m) or greater.
  8. All of the above conditions are met and one of the following occurs for 5 seconds: The TFP manual valve position switch indicates Park/Neutral when the gear ratio is less than 0.72:1 (4th gear). The TFP manual valve position switch indicates Reverse when the gear ratio is greater than 2.23:1, or less than 2.02:1. The TFP manual valve position switch indicates a Drive range when the gear ratio indicates Reverse.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Start the engine and idle at the normal operating temperature. Using scan tool, monitor TFP switch. Apply the brake pedal. Select each transaxle range. Does each selected transaxle range match the scan tool TFP switch display? If so, see «DIAGNOSTIC AIDS»(ref-155792-S27789843552003062500000) . If not, go to next step.
  4. Inspect the transaxle linkage from the gearshift lever to the manual valve for proper adjustment. Adjust the linkage as necessary. See appropriate SERVICING article. Did the linkage require adjustment? If so, go to step 17 . If not, go to next step.
  5. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Turn ignition on, engine off. Does the scan tool TFP switch A/B/C parameter indicate HI for all range states? If so, go to next step. If not, go to step 10 .
  6. Turn ignition off. Install Jumper Harness (J-44152) on the engine side of the transaxle 20-way connector. Turn ignition on, engine off. Measure the voltage from jumper harness terminal "N" to ground. Measure the voltage from jumper harness terminal "R" to ground. Measure the voltage from jumper harness terminal "P" to ground. Does the voltage measure ignition voltage at all three terminals? If so, go to next step. If not, go to step 11 .
  7. Connect a fused jumper wire from jumper harness terminal "N" (range "A" circuit) to ground while monitoring the scan tool TFP switch A/B/C parameter. When the range "A" circuit (1224) is grounded, do any other range circuits indicate LOW? If so, go to step 12 . If not, go to next step.
  8. Connect a fused jumper wire from jumper harness terminal "R" (range "B" circuit) to ground while monitoring the scan tool TFP switch A/B/C parameter. When the range "B" circuit (1225) is grounded, do any other range circuits indicate LOW? If so, go to step 12 . If not, go to next step.
  9. Connect a fused jumper wire from jumper harness terminal "P" (range "C" circuit) to ground while monitoring the scan tool TFP switch A/B/C parameter. When the range "C" circuit (1226) is grounded, do any other range circuits indicate LOW? If so, go to step 12 . If not, go to step 13 .
  10. Test the TFP manual valve position switch range circuits that did not indicate HI for a short to a ground between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 17 . If not, go to step 16 .
  11. Test the TFP manual valve position switch range circuits that did not indicate ignition voltage for an open between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 17 . If not, go to step 16 .
  12. Test the affected TFP manual valve position switch range circuits for a shorted together condition between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 17 . If not, go to step 16 .
  13. Test the affected TFP manual valve position switch range circuits for an open or shorted condition between the transaxle 20-way connector and the TFP manual valve position switch. Did you find the condition? If so, go to next step. If not, go to step 15 .
  14. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 17 .
  15. Replace the TFP manual valve position switch. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 17 .
  16. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  17. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Start the vehicle and idle in Park for 10 seconds. Drive the vehicle with gearshift lever in "D" position and a throttle angle greater than 10 percent. Allow the transaxle to shift through all gears. Select SPECIFIC DTC. Enter DTC P1810. Has the test run and passed? If so, system is okay. If not, go to step 1 .

A pressure regulator malfunction could set DTC P1810. Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. Shift is adaptable.
  2. Shift adapt is at limit.

DTC will set under the following conditions

  1. Shift time is greater than .65 second twice during ignition cycle.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Use the scan tool snapshot mode to record the shift times. Drive the vehicle with gearshift lever in "D" position to obtain 1-2, 2-3, and 3-4 shift times. Record the shift times. Did all the shift times exceed 0.65 second? If so, go to next step. If not, go to step 6 .
  4. Perform line pressure check. See «HYDRAULIC PRESSURE TESTS»(ref-155792-S09367307862003062500000) under PERFORMANCE TESTS. Go to next step.
  5. Inspect the transaxle for the following conditions: Low fluid level caused by external leaks. Clogged fluid filter. Out-of-position fluid filter. Internal fluid passage leaks. Casting porosity or damage. Damaged gasket or spacer plate. Out-of-position gasket or spacer plate. Contaminated PC solenoid valve. Damaged PC solenoid valve. Stuck PC solenoid valve. Stuck pressure regulator valve train. Leaking pressure regulator valve train. Stuck torque signal valve train. Leaking torque signal valve train. Leaking oil pump. Damaged oil pump. Inadequate oil pump suction. Oil pump cavitation. Repair any of the above conditions as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to step 12 .
  6. Did the 1-2 shift time exceed 0.65 second? If so, go to step 9 . If not, go to next step.
  7. Did the 2-3 shift time exceed 0.65 second? If so, go to step 10 . If not, go to next step.
  8. Did the 3-4 shift time exceed 0.65 second? If so, go to step 11 .
  9. Inspect the 1-2 shift circuit for the following conditions: Leaking 1-2 accumulator piston seals. Rolled 1-2 accumulator piston seals. Cut 1-2 accumulator piston seals. Leaking 2nd clutch piston seals. Rolled 2nd clutch piston seals. Cut 2nd clutch piston seals. Burned 2nd clutch plates. Damaged 2nd clutch plates. Broken 2nd clutch springs. Out-of-position 2nd clutch springs. Damaged 2nd clutch piston. Leaking driven sprocket support seals. Damaged driven sprocket support seals. Internal fluid passage leaks. Casting porosity or damage. Damaged gasket or spacer plate. Out-of-position gasket or spacer plate. Slipping forward clutch. Cracked or damaged driven sprocket support. Damaged sprag clutch, not holding. 2nd roller clutch damaged, not holding. Repair the 1-2 shift circuit as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to step 12 .
  10. Inspect the 2-3 shift circuit for the following conditions: Leaking 2-3 accumulator piston seals. Rolled 2-3 accumulator piston seals. Cut 2-3 accumulator piston seals. Leaking direct clutch piston seals. Rolled direct clutch piston seals. Cut direct clutch piston seals. Burned direct clutch plates. Damaged direct clutch plates. Broken direct clutch springs. Out-of-position direct clutch springs. Damaged direct clutch pistons. Leaking driven sprocket support seals. Damaged driven sprocket support seals. Damaged driven sprocket support. Damaged, or not holding, sprag clutch. Internal fluid passage leaks. Casting porosity or damage. Damaged gasket or spacer plate. Out-of-position gasket or spacer plate. Repair the 2-3 shift circuit as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to step 12 .
  11. Inspect the 3-4 shift circuit for the following conditions: Leaking 3-4 accumulator piston seals. Rolled 3-4 accumulator piston seals. Cut 3-4 accumulator piston seals. Leaking intermediate-4th servo piston seals. Rolled intermediate-4th servo piston seals. Cut intermediate-4th servo piston seals. Burned intermediate-4th band. Out-of-position intermediate-4th band. Damaged intermediate-4th band. Slipping intermediate-4th band. Internal fluid passage leaks. Casting porosity or damage. Damaged gasket or spacer plate. Out-of-position gasket or spacer plate. Slipping direct clutch. Damaged intermediate-4th servo pin. Seized intermediate-4th servo pin. Damaged intermediate-4th servo piston. Cracked intermediate-4th servo cover. Leaking intermediate-4th servo cover. Repair the 3-4 shift circuit as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to next step.
  12. Change the transmission fluid and filter. See appropriate SERVICING article. Use the scan tool to perform the CLEAR TAPS function. Did you complete the procedures? If so, go to next step.
  13. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position to obtain 1-2, 2-3, and 3-4 shifts. Shift times must be less than 0.65 second. Select SPECIFIC DTC. Enter DTC P1811. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Question owner about vehicle overloading, exceeding trailer towing limit or towing in overdrive. If after several unsuccessful attempts to gain accurate shift times and an adapt can be made, reset adapts and operate vehicle to assure proper shifting.

DTC will run under the following condition

  1. The system voltage is 8-18 volts.

DTC will set under the following conditions

  1. No VSS DTCs P0502 or P0503.
  2. No ISS DTCs P0716 or P0717.
  3. The engine speed is in transition from zero RPM to greater than 600 RPM.
  4. The vehicle speed is less than 2 MPH.
  5. "D2", "D4" or Reverse is indicated after start-up for 2 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform transmission fluid checking procedure. See appropriate SERVICING article.
  3. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Start the engine and idle at the normal operating temperature. Using scan tool, monitor TFP switch. Apply the brake pedal. Select each transaxle range. Does each selected transaxle range match the scan tool TFP switch display? If so, see «DIAGNOSTIC AIDS»(ref-155792-S15532956182003062500000) . If not, go to next step.
  4. Inspect the shift linkage from the gearshift lever to the manual valve for proper adjustment. Adjust the linkage as necessary. See appropriate SERVICING article. Did the shift linkage require adjustment? If so, go to step 17 . If not, go to next step.
  5. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Turn ignition on, engine off. Does the scan tool TFP switch A/B/C parameter indicate HI for all range states? If so, go to next step. If not, go to step 10 .
  6. Turn ignition off. Install the Jumper Harness (J-44152) on the engine side of the transaxle 20-way connector. Turn ignition on, engine off. Measure the voltage from jumper harness terminal "N" to ground. Measure the voltage from jumper harness terminal "R" to ground. Measure the voltage from jumper harness terminal "P" to ground. Does the voltage measure ignition voltage at all three terminals? If so, go to next step. If not, go to step 11 .
  7. Connect a fused jumper wire from jumper harness terminal "N" (range "A" circuit) to ground while monitoring the scan tool TFP switch A/B/C parameter. When the range "A" circuit (1224) is grounded, do any other range circuits indicate LOW? If so, go to step 12 . If not, go to next step.
  8. Connect a fused jumper wire from jumper harness terminal "R" (range "B" circuit) to ground while monitoring the scan tool TFP switch A/B/C parameter. When the range "B" circuit (1225) is grounded, do any other range circuits indicate LOW? If so, go to step 12 . If not, go to next step.
  9. Connect a fused jumper wire from jumper harness terminal "P" (range "C" circuit) to ground while monitoring the scan tool TFP switch A/B/C parameter. When the range "C" circuit (1226) is grounded, do any other range circuits indicate LOW? If so, go to step 12 . If not, go to step 13 .
  10. Test the TFP manual valve position switch range circuits that did not indicate HI for a short to a ground between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 17 . If not, go to step 16 .
  11. Test the TFP manual valve position switch range circuits that did not indicate ignition voltage for an open between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 17 . If not, go to step 16 .
  12. Test the affected TFP manual valve position switch range circuits for a shorted together condition between the PCM and the transaxle 20-way connector. Did you find and correct a condition? If so, go to step 17 . If not, go to step 16 .
  13. Test the affected TFP manual valve position switch range circuits for an open or shorted condition between the transaxle 20-way connector and the TFP manual valve position switch. Did you find the condition? If so, go to next step. If not, go to step 15 .
  14. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 17 .
  15. Replace the TFP manual valve position switch. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 17 .
  16. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  17. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Road test vehicle. Select SPECIFIC DTC. Enter DTC P1815, P1816, P1817 or P1818 depending on DTC being tested. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No PSA DTCs P1810, P1815, P1817 or P1818.
  2. The vehicle speed is 5 MPH or more.
  3. The throttle angle is greater than 10 percent.
  4. The engine torque is greater than 10 ft. lbs. (13 N.m).

DTC will set under the following conditions

  1. The PCM detects Park/Neutral with a drive ratio less than 3.11 for 5 seconds.

Diagnosis Procedure

For diagnosis procedure, see DIAGNOSTIC PROCEDURE under DTC P1815: TFP MANUAL VALVE POSITION SWITCH - START IN WRONG RANGE.

DTC will run under the following conditions

  1. No PSA DTCs P1810, P1815, P1816 or P1818.
  2. The vehicle speed is 5 MPH or more.
  3. The throttle angle is greater than 10 percent.
  4. The engine torque is greater than 10 ft. lbs. (13 N.m).

DTC will set under the following conditions

  1. The PCM detects Reverse with a Drive gear ratio.

For diagnosis procedure, see DIAGNOSTIC PROCEDURE under DTC P1815: TFP MANUAL VALVE POSITION SWITCH - START IN WRONG RANGE.

DTC will run under the following conditions

  1. No PSA DTCs P1810, P1815, P1816 or P1817.
  2. The vehicle speed is 5 MPH or more.
  3. The throttle angle is greater than 10 percent.
  4. The engine torque is greater than 10 ft. lbs. (13 N.m).

DTC will set under the following conditions

  1. The PCM detects a Drive range with a Reverse ratio.

For diagnosis procedure, see DIAGNOSTIC PROCEDURE under DTC P1815: TFP MANUAL VALVE POSITION SWITCH - START IN WRONG RANGE.

DTC will run under the following conditions

  1. System voltage is 8-18 volts.
  2. Engine has been running for more than 5 seconds, and is not in fuel shut-off mode.
  3. TCC duty cycle is less than 10 percent or more than 90 percent.

DTC will set under the following conditions

  1. PCM detects an open, short to ground or short to voltage in TCC PWM solenoid circuit for 5 seconds.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Is DTC P0753 or P0758 also set? If so, go to next step. If not, go to step 8 .
  3. Remove appropriate fuse for TCC PWM solenoid valve power feed circuit. Inspect the fuse for an open. Did you find the condition? If so, go to next step. If not, go to step 6 .
  4. Test the TCC PWM solenoid valve power feed circuit for a short to ground between the fuse block and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 25 . If not, go to next step.
  5. Test the TCC PWM solenoid valve power feed circuit for a short to ground between the transaxle 20-way connector and the TCC PWM solenoid valve. Did you find the condition? If so, go to step 22 .
  6. Test the TCC PWM solenoid valve power feed circuit for an open between the fuse block and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 25 . If not, go to next step.
  7. Test the TCC PWM solenoid valve power feed circuit for an open between the transaxle 20-way connector and the TCC PWM solenoid valve. Did you find the condition? If so, go to step 22 .
  8. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install Jumper Harness (J-44152) on the engine side of the transaxle 20-way connector. Connect a test light between jumper harness terminals "E" and "T". Turn ignition on, engine off. Is the test light on? If so, go to next step. If not, go to step 11 .
  9. Turn ignition off. Disconnect the PCM connectors. Additional DTCs may set. Turn ignition on, engine off. Is the test light on? If so, go to next step. If not, go to step 24 .
  10. Test the TCC PWM solenoid valve control circuit for a short to ground between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 25 .
  11. Using the scan tool, cycle the TCC PWM solenoid valve on and off three times. Does the test light cycle on and off as commanded? If so, go to step 16 . If not, go to next step.
  12. Is the test light always off? If so, go to next step.
  13. Test the TCC PWM solenoid valve control circuit for an open between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 25 . If not, go to next step.
  14. Connect a test light from jumper harness terminal "T" to ground. Is the test light on? If so, go to next step. If not, go to step 24 .
  15. Test the TCC PWM solenoid valve control circuit for a short to voltage between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 25 .
  16. Turn ignition off. Disconnect the jumper harness from the engine side of the transaxle 20-way connector. Install the jumper harness on the transaxle side of the transaxle 20-way connector. Measure the resistance between jumper harness terminals "E" and "T". Is the resistance 10-15 ohms? If so, go to step 19 . If not, go to next step.
  17. Is the resistance greater than 15 ohms? If so, go to next step. If not, go to step 19 .
  18. Test the TCC PWM solenoid valve control circuit for an open between the transaxle 20-way connector and the TCC PWM solenoid valve. Test the TCC PWM solenoid valve power feed circuit for an open between the transaxle 20-way connector and the TCC PWM solenoid valve. Did you find a condition? If so, go to step 22 . If not, go to step 23 .
  19. Measure the resistance from jumper harness terminal "T" to ground. Is the resistance less than 1000 ohms? If so, go to next step. If not, go to step 21 .
  20. Test the TCC PWM solenoid valve control circuit for a short to ground between the transaxle 20-way connector and the TCC PWM solenoid valve. Did you find a condition? If so, go to step 22 .
  21. Measure the resistance between jumper harness terminal "T" and all other jumper harness terminals, except terminals "A", "B" and "E". Is the resistance between terminal "T" and any other terminal, except terminals "A", "B" and "E", less than 1000 ohms? If so, go to next step. If not, go to step 23 .
  22. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 25 .
  23. Replace the TCC PWM solenoid valve. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 25 .
  24. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  25. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position. Increase vehicle speed until the TCC is applied. Ensure that the TCC duty cycle is 10-90 percent for more than 5 seconds. Select SPECIFIC DTC. Enter DTC P1860. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Ensure transaxle fluid level is correct. Inspect PCM, transaxle and TCC PWM solenoid connectors for bent, broken or backed out terminals. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. Check for moisture or corrosion. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

DTC will run under the following conditions

  1. No ISS DTCs P0716 or P0717.
  2. No TCC DTCs P0741 or P0742.
  3. Engine is running.
  4. Transaxle Fluid Pressure (TFP) manual valve position switch is in D4.
  5. Engine torque is more than 30 ft. lbs. (41 N.m).
  6. TCC is commanded on.
  7. TCC slip speed is between -20 RPM and 40 RPM.

DTC will set under the following conditions

  1. The TCC release switch is open, release fluid pressure present, for 6 seconds, twice during the same trip.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see «DIAGNOSTIC SYSTEM CHECK»(ref-155792-S27457265162003062500000) under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Using scan tool, monitor TCC release pressure. Does the scan tool indicate TCC release pressure is present? If so, go to next step. If not, go to step 6 .
  3. Turn ignition off. Disconnect the transaxle 20-way connector. Additional DTCs may set. Install Jumper Harness (J-44152) on the engine side of the transaxle 20-way connector. Connect a fused jumper wire from jumper harness terminal "U" to ground. Turn ignition on, engine off. Does the scan tool indicate TCC release pressure is present? If so, go to next step. If not, go to step 5 .
  4. Test the TCC release switch signal circuit for an open between the PCM and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step 11 . If not, go to step 10 .
  5. Test the TCC release switch signal circuit for an open between the transaxle 20-way connector and the TFP manual valve position switch. Did you find the condition? If so, go to step 8 . If not, go to step 9 .
  6. Use the scan tool snapshot mode to record TCC slip speed and TCC release pressure. Operate the vehicle under the following conditions: Drive the vehicle with the gearshift lever in "D" position. Increase the vehicle speed until the TCC is applied. Ensure that slip speed is less than 40 RPM. With the TCC applied and slip speed less than 40 RPM, does the scan tool indicate TCC release pressure is present? If so, go to next step. If not, see «DIAGNOSTIC AIDS»(ref-155792-S10259619752003062500000) .
  7. Inspect for the following conditions: Leaking torque converter "O" ring seal. Cut torque converter "O" ring seal. Debris or flash blocking the channel plate at the TCC release exhaust passage. Leaking oil pump bearing and seal assembly seal. Cut oil pump bearing and seal assembly seal. Oil pump bearing and seal assembly installed backwards. Misaligned valve body to spacer plate gasket. Misaligned spacer plate to channel plate gasket. Channel plate turbine shaft sleeve installed backwards, or with no press fit. Damaged valve body spacer plate, release exhaust orifice, valve body to spacer plate gasket, or spacer plate to channel plate gasket. Cut turbine shaft to sprocket seal. Missing turbine shaft to sprocket seal. Repair any of the above conditions as necessary. Did you complete the repair? If so, go to step 11 .
  8. Replace the transaxle internal wiring harness. See appropriate SERVICING article. Did you complete the repair? If so, go to step 11 .
  9. Replace the TFP manual valve position switch. See appropriate SERVICING article. Did you complete the repair? If so, go to step 11 .
  10. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  11. Perform the following procedure to verify the repair: Select DTC. Select CLEAR INFO. Drive the vehicle with gearshift lever in "D" position to obtain 45 MPH. With the TCC commanded on and engaged, TCC release pressure must not be present for 3 seconds. Select SPECIFIC DTC. Enter DTC P1887. Has the test run and passed? If so, system is okay. If not, go to step 1 .

Inspect wiring for poor connections at PCM and transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change.

The Transmission Range (TR) switch is part of the park/neutral position and back-up lamp switch assembly, and is mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The PCM supplies ignition voltage to the TR switch on four signal circuits: "A", "B", "C", and "P". Each gear selector lever position grounds one or more of the signal circuits in a unique pattern. In order to determine the gear range selected by the driver, the PCM compares the voltage combination on the signal circuits to a TR switch combination table stored in memory. See TRANSAXLE RANGE SWITCH LOGIC table under DESCRIPTION & OPERATION.

  1. Install a scan tool. Turn ignition on, engine off. Select TR SW. on the scan tool. With the scan tool, observe the TR SW. display while selecting each transaxle range. Does each selected transaxle range match the scan tool TR SW. display? If so, see «DIAGNOSTIC AIDS»(ref-155792-S26061097962003062500000) . If not, go to next step.
  2. Inspect the PNP switch assembly for damaged, loose or missing mounting hardware and proper adjustment. Inspect the shift cable for damaged or stretched cable and proper adjustment. See appropriate SERVICING article. Did you find and correct a condition? If so, go to step 15 .
  3. Using scan tool, observe the TR switch A/B/C/P display. Does the scan tool TR switch A/B/C/P parameter indicate HI for all range signal states? If so, go to step 12 . If not, go to next step.
  4. Turn ignition off. Disconnect the TR switch 4-way connector. Turn ignition on, engine off. Does the scan tool TR switch A/B/C/P parameter indicate HI for all range signal states? If so, go to next step. If not, go to step 9 .
  5. Measure the voltage from TR switch 4-way connector terminal "A" to ground. Measure the voltage from TR switch 4-way connector terminal "B" to ground. Measure the voltage from TR switch 4-way connector terminal "C" to ground. Measure the voltage from TR switch 4-way connector terminal "D" to ground. Does the voltage measure 10-12 volts at all four terminals? If so, go to next step. If not, go to step 10 .
  6. Connect a fused jumper wire from TR switch 4-way connector terminal "D" (signal "A" circuit) to ground while monitoring the scan tool TR switch A/B/C/P parameter. When the signal "A" circuit (771) is grounded, do any other signal circuits indicate LOW? If so, go to step 11 . If not, go to next step.
  7. Connect a fused jumper wire from the TR switch 4-way connector terminal "B" (signal "B" circuit) to ground while monitoring the scan tool TR switch A/B/C/P parameter. When the signal "B" circuit (772) is grounded, do any other signal circuits indicate LOW? If so, go to step 11 . If not, go to next step.
  8. Connect a fused jumper wire from the TR switch 4-way connector terminal "C" (signal "C" circuit) to ground while monitoring the scan tool TR switch A/B/C/P parameter. When the signal "C" circuit (773) is grounded, do any other signal circuits indicate LOW? If so, go to step 11 . If not, go to step 13 .
  9. Test the TR switch signal circuit or circuits that did not indicate HI for a short to ground. Did you find and correct the condition? If so, go to step 15 . If not, go to step 14 .
  10. Test the TR switch signal circuit or circuits that did not indicate proper voltage for an open. Did you find and correct the condition? If so, go to step 15 . If not, go to step 14 .
  11. Test the affected TR switch signal circuits for a shorted together condition. Did you find and correct the condition? If so, go to step 15 . If not, go to step 14 .
  12. Test the TR switch ground circuit for an open. Did you find and correct the condition? If so, go to step 15 . If not, go to next step.
  13. Replace the TR switch. See appropriate SERVICING article. Did you complete the replacement? If so, go to step 15 .
  14. Replace PCM. See appropriate REMOVAL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  15. Turn ignition on, engine off. Using the scan tool, observe the TR switch display while selecting each transaxle range. Does each selected transaxle range match the scan tool TR switch display? If so, system is okay. If not, go to step 2 .

Inspect wiring for poor connections at PCM and at transaxle 20-way connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside insulation. If diagnosing for intermittent short or open condition, manipulate harness while observing scan tool for value change. Inspect transaxle wiring harness for transmission fluid.

SHIFT SOLENOID LEAK TEST

Note. This procedure tests ON/OFF type solenoid valves.

Note. Visually inspect the physical condition of the solenoid before testing. Inspect the "O" rings before and after the test to be sure that they are not cut or damaged.

  1. Remove the solenoid from the control valve body.
  2. Install the 1-2 or the 2-3 shift solenoid valve into bore No. 2 of the Solenoid Testing Kit (J-44246), and install the factory retainer clip to retain the solenoid. (Scheme 127)
  3. Connect the solenoid testing harness supplied with the solenoid tester to the solenoid. (Scheme 128)
  4. Apply compressed air to the solenoid tester.
  5. Air should flow through the solenoid. If air does not flow through the solenoid, replace the solenoid.
  6. Connect the solenoid testing harness to the positive and negative battery terminals.
  7. Observe if the solenoid is operating electrically. An audible clicking noise can be heard when connecting or disconnecting power.
  8. Observe the air flow through the solenoid. The flow will completely or nearly completely stop. Replace the solenoid if there continues to be an obvious air leak when the solenoid is energized.
  9. Install the solenoid into the control valve body.

Scheme 127

Scheme 127
Scheme 127

Scheme 128

Scheme 128
Scheme 128

More articles — Automatic Transaxle Diagnosis - 4T40-E & 4T45-E