Cause of Failure
WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
- The wiring harness or connector between PCS and TCM
- The PCS
- The TCM
| Step |
Action |
Values |
Yes |
No |
| 1 |
Did you perform the Diagnostic System Check - Automatic Transmission? |
- |
Go to Step 2 |
Go to Diagnostic System Check - Automatic Transmission |
| 2 |
- Turn OFF the ignition.
- Install the scan tool.
- With the engine OFF, turn the ignition switch to the ON position.
- Select Store Freeze Frame/Failure Records from the DTC Information menu.
- Store Freeze Frame/Failure Records.
- Select Clear DTC Information from the DTC Information menu.
- Clear the DTC information.
- Perform one vehicle drive cycle.
Is the hold lamp ON? |
- |
Go to Step 3 |
Go to Step 5 |
| 3 |
- Select Request DTC by Status from the DTC Information menu.
- Request DTC by Status.
Is DTC P0748 displayed? |
- |
Go to Step 4 |
Go to Step 5 |
| 4 |
- Turn OFF the ignition.
- Measure the resistance between the vehicle harness and Pressure Control Solenoid (PCS). Refer to 1, 2 Shift Solenoid, Timing Solenoid, and Lock-Up Solenoid Inspection
.
- Disconnect the transmission control module (TCM) connector and inspect the resistance between the terminal A4 and A2.
Is the measurement within the specified values? |
20°C (68°F)
5.0-5.6 Ω |
Go to Step 6 |
Go to Step 7 |
| 5 |
Repair the temporary connection failure of the connector. Refer to Wiring Harness and Connector Inspection Diagnosis
.
Did you complete the repair? |
- |
System OK |
- |
| 6 |
- Estimate the failure between the vehicle wiring harness connector and the TCM.
- Inspect the connector. Refer to Wiring Harness and Connector Inspection Diagnosis
.
- Inspect the connection condition between the connectors.
Is the connection condition OK? |
- |
Go to Step 8 |
Go to Step 5 |
| 7 |
- Estimate the failure between the vehicle harness and PCS.
- Disconnect the transaxle harness connector and measure the resistance between PCS connector terminal 3 and 8.
Is the measurement within the specified values? |
20°C (68°F)
5.0-5.6 Ω |
Go to Step 9 |
Go to Step 10 |
| 8 |
- Replace the TCM.
- Perform the reproducing test under user condition after confirming no DTC.
Is DTC displayed? |
- |
Go to Step 2 |
System OK |
| 9 |
- Estimate the failure of the vehicle wiring harness or between connectors.
- Test the continuity and short circuit for the vehicle wiring harness and inspect the connection condition between connectors. Refer to Wiring Harness and Connector Inspection Diagnosis
.
Is the condition OK? |
- |
Go to Step 2 |
Go to Step 12 |
| 10 |
- Estimate the failure of the transaxle harness or between connectors of PCS.
- Inspect the PCS. Refer to 1, 2 Shift Solenoid, Timing Solenoid, and Lock-Up Solenoid Inspection
.
Is the condition found? |
- |
Go to Step 13 |
Go to Step 11 |
| 11 |
- Estimate the failure of the transaxle harness.
- Test the continuity and short circuit for the transaxle harness and inspect the connection condition between connectors. Refer to Wiring Harness and Connector Inspection Diagnosis
.
Is the condition OK? |
- |
Go to Step 5 |
Go to Step 12 |
| 12 |
Replace the transaxle harness.
Did you complete the replacement? |
- |
System OK |
- |
| 13 |
Replace the valve body assembly. Refer to Control Valve Body Disassemble
.
Did you complete the replacement? |
- |
System OK |
- |