Circuit Description
The transaxle control module (TCM) uses transaxle input speed information and an output speed sensor to control line pressure, torque converter clutch (TCC) apply and release, and transaxle shift patterns. This information is also used to calculate the appropriate operating gear ratios and TCC slippage.
Conditions for Setting the DTC
| • | The time since the TCM reset is greater than 500 millisecond. |
| • | The time since the shift end is greater than 500 millisecond. |
| • | The transmission oil temperature is greater than -10°C (+14°F). |
| • | System voltage is greater than 9 volts. |
| • | No input speed error DTCs P0715, P0716, and P0717 are set. |
| • | The output speed is greater than 256 RPM. |
| • | The input speed is greater than 400 RPM. |
| • | No gear shift is active. |
Action Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate. |
| • | The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer. |
| • | Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control. |
| • | After the ignition is OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
| • | High line pressure |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF when the malfunction has not occurred after 3 ignition cycles. |
| • | A history DTC will clear after 40 consecutive warm-up cycles without a fault. |
| • | Using a scan tool can clear history DTCs. |
Diagnostic Aids
| • | Inspect for an intermittent input speed sensor or output speed sensor circuit problems. |
| • | Inspect for possible incorrect calibration. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Automatic Transmission? | -- | Go to Step 2 | |
2 | Visually inspect the transaxle cooling system for fluid leaks. Was the condition found and corrected? | -- | Go to Step 7 | Go to Step 3 |
3 | Has the transaxle fluid checking procedure been performed? | -- | Go to Step 4 | |
4 |
Does the commanded gear ratio match the ranges shown? | 1st=2.719 2nd=1.487 3rd=1.000 4th=0.717 | Go to Diagnostic Aids | Go to Step 5 |
5 | Perform the line pressure check. Was the condition found and corrected? | -- | Go to Step 7 | Go to Step 6 |
6 | Inspect for possible clutch slippage. Was the condition found and corrected? | -- | Go to Step 7 | -- |
7 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 8 | System OK |
8 | Replace the transaxle assembly. Refer to Transmission Replacement Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Are there any DTCs that have not been diagnosed? | -- | Go to Step 2 | System OK |
