Symptoms - Automatic Transmission
| Diagnostic Category | Diagnostic Information |
|---|---|
| The following table consists of eight diagnostic categories that are located in the left hand column. Using this column, choose the appropriate category based on the operating conditions of the vehicle or transmission. After selecting a category, use the right hand column to locate the specific symptom diagnostics information. | |
| Fluid Diagnosis: This category contains the following topics: Fluid condition - appearance, contaminants, smell, overheating Line pressure - high or low Fluid leaks | Refer to Transmission Fluid Checking Procedure . Refer to Line Pressure Check Procedure . Refer to Fluid Leak Diagnosis . Refer to Automatic Transmission Oil Cooler Flushing and Flow Test . Refer to Engine Coolant/Water in Transmission . |
| Noise and Vibration Diagnosis: This category contains the following topics: Noise - drive gear, final drive, whine, growl, hum, rattle, knock, clunk Vibration | Refer to Noise in All Ranges . Refer to Vibration at Idle . Refer to Vibration in All Shift Lever Positions . |
| Range Performance Diagnosis: This category contains the following topics: No Park No Reverse or slips No Drive or slips No engine braking Range selector displays incorrect range | Refer to Stall Speed Test . Refer to No Forward and Reverse . Refer to No Drive in Forward Ranges . Refer to No Reverse, or Forward Movement In Reverse . Refer to High Stall Speed in Drive, Intermediate and Low . Refer to Stall Speed High in Reverse . Refer to Range Selector Displays Incorrect Range . Refer to Vehicle Does Not Move in Low Range . Refer to Low Stall Speed . Refer to Shift Lever Does Not Operate Smoothly . Refer to Transmission Does Not Shift into Park . Refer to Shift Indicator Indicates Wrong Gear Selection . |
| Shift Quality Feel Diagnosis: This category contains the following topics: Harsh shifts Soft shifts Harsh engagement Delayed engagement | Refer to Harsh Shifts . Refer to Harsh 1-2 or 2-1 Shift Feel . Refer to Harsh or Soft 2-3/3-2 Shift Feel . Refer to Harsh or Soft 3-4/4-3 Shift Feel . Refer to Harsh Shift 4 to 5, or 5 to 4 . Refer to Delay in Shifting from Neutral to Drive and Intermediate Ranges . Refer to Delayed Engagement into Reverse . Refer to Poor Acceleration, Flares on Start Off in Drive, Intermediate and Reverse . |
| Shift Pattern: This category contains the following topics: No upshift No downshift | Refer to Transmission Does Not Shift . Refer to Forward Motion in Neutral . Refer to Shift Lever Does Not Operate Smoothly . Refer to Transmission Does Not Shift into Park . Refer to Shift Indicator Indicates Wrong Gear Selection . |
| Shift Speed Diagnosis: This category consists of the following topic: Inaccurate or inconsistent shift points | Refer to Erratic Shift Quality . Refer to Shift Speed Too Low . |
| Torque Converter Diagnosis: This category contains the following topics: Torque converter diagnosis TCC does not apply TCC does not release TCC apply/release quality | Refer to Torque Converter Clutch (TCC) Not Disengaging . Refer to Harsh Torque Converter Clutch (TCC) Apply or Release . Refer to No Torque Converter Clutch (TCC) Apply . Refer to Vehicle Does Not Accelerate More Than 31 mph (50 km/h) . Refer to Torque Converter Diagnosis Procedure . |
| Symptom Can Not Be Duplicated or Symptom Not Found: This category contains the following topics: Transmission fluid diagnosis Line pressure diagnosis Road testing | Refer to Transmission Fluid Checking Procedure . Refer to Line Pressure Check Procedure . Refer to Road Test Procedure . |
Symptoms - Automatic Transmission
Scheme 199
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 5: By disconnecting the TR switch, the ground path for all TR switch circuits would be removed and the PCM should recognize all circuits as open. The scan tool should display HI for all range signals.
- 6: This step tests the TR switch wiring for an open or lack of signal voltage from the PCM.
- 7: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal park should change to LOW.
- 8: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal reverse should change to LOW.
- 9: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal neutral should change to LOW.
- 10: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal drive should change to LOW.
- 11: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal intermediate should change to LOW.
- 12: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal forward should change to LOW.
- 13: This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal low should change to LOW.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Did you perform the Diagnostic System Check - Engine Controls? | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.5L (L66) | |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. Select TR Sw. parameter on the scan tool. With the scan tool observe the TR Sw. parameter display while selecting transmission ranges: P, R, N, D, I, L. Does TR Sw. parameter display match each transmission range selection? | Go to Intermittent Conditions in Engine Controls - 3.5L (L66) | Go to Step 3 | |
| 3 | Inspect the PNP switch assembly for the following conditions: Damage Loose or missing mounting hardware Proper adjustment Refer to Park/Neutral Position Switch Replacement . Inspect the shift cable for the following conditions: Damaged or stretched cable Proper adjustment Did you find and correct a condition? | Go to Step 20 | Go to Step 4 | |
| 4 | With the scan tool, observe the TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. Does the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters indicate HI for all range signal states? | Go to Step 17 | Go to Step 5 | |
| 5 | Turn OFF the ignition. Disconnect the TR switch 10-way connector. Turn ON the ignition, with the engine OFF. Does the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters indicate HI for all range signal states? | Go to Step 6 | Go to Step 14 | |
| 6 | Using the DMM and the J-35616 connector test adapter kit, measure the voltage from the TR switch park signal circuit 10-way connector to ground. Measure the voltage from the TR switch reverse signal circuit 10-way connector to ground. Measure the voltage from the TR switch neutral signal circuit 10-way connector to ground. Measure the voltage from the TR switch drive signal circuit 10-way connector to ground. Measure the voltage from the TR switch intermediate signal circuit 10-way connector to ground. Measure the voltage from the TR switch forward signal circuit 10-way connector to ground. Measure the voltage from the TR switch low signal circuit 10-way connector to ground. Does the voltage measure within the specified value at all circuits? | 10-12 V | Go to Step 7 | Go to Step 15 |
| 7 | Connect a 3 amp fused jumper wire from the TR switch park signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L, and the TR Sw. Forward Range parameters. When the TR switch park signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 8 | |
| 8 | Connect a 3 amp fused jumper wire from the TR switch reverse signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. When the TR switch reverse signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 9 | |
| 9 | Connect a 3 amp fused jumper wire from the TR switch neutral signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. When the TR switch neutral signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 10 | |
| 10 | Connect a 3 amp fused jumper wire from the TR switch drive signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. When the TR switch drive signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 11 | |
| 11 | Connect a 3 amp fused jumper wire from the TR switch intermediate signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. When the TR switch intermediate signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 12 | |
| 12 | Connect a 3 amp fused jumper wire from the TR switch forward signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. When the TR switch forward signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 13 | |
| 13 | Connect a 3 amp fused jumper wire from the TR switch low signal circuit 10-way connector to ground while monitoring the scan tool TR Sw. P/R/N, TR Sw. D/I/L and the TR Sw. Forward Range parameters. When the TR switch low signal circuit is grounded, do any other signal circuits indicate LOW? | Go to Step 16 | Go to Step 18 | |
| 14 | Test the TR switch signal circuits that did not indicate HI for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | |
| 15 | Test the TR switch signal circuits that did not indicate proper voltage for an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | |
| 16 | Test the affected TR switch signal circuits for a shorted together condition. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | |
| 17 | Test the TR switch ground circuit for an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 18 | |
| 18 | Replace the TR switch. The TR switch is part of the PNP switch. Refer to Park/Neutral Position Switch Replacement . Did you complete the replacement? | Go to Step 20 | ||
| 19 | IMPORTANT: Always perform the PCM set up procedure. Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 3.5L (L66). Perform the PCM setup procedure. Did you complete the replacement? | Go to Step 20 | ||
| 20 | Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Start the engine and select gear ranges P, R, N, D, I, L. Road test the vehicle. Select Specific DTC. Enter DTC P0705. Has the test run and passed? | Go to Step 21 | Go to Step 2 | |
| 21 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | Go to Diagnostic Trouble Code (DTC) Type(s) in Engine Controls - 3.5L (L66) | System OK |
| IMPORTANT |
|---|
| Always perform the PCM set up procedure. |
Range Selector Displays Incorrect Range