The transaxle control module (TCM) is an electronic device which monitors inputs to control various transaxle function including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.
• | The system voltage is less than 8.5 volts. |
• | The transaxle input voltage is too low. |
• | The engine speed is greater than 500 RPM. |
• | The hold lamp will blink. |
• | The TCM will record operating conditions at the time that 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 ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
• | The power supply cut off to the PCS valve. |
• | A hold lamp 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. |
• | Inspect the poor wiring harness connector for TCM connectors and transaxle wiring connectors. |
• | Inspect the improperly formed or damaged terminals. |
Step | Action | Values | Yes | No |
---|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Automatic Transmission? | -- | Go to Step 2 | |
2 |
Is the voltage within the specified range? | 9-16 V | Go to Step 4 | Go to Step 3 |
3 |
Is the voltage within the specified range? | 9-16 V | Go to Step 4 | |
4 |
Is the voltage within the specified range? | 9-16 V | Go to Step 6 | Go to Step 5 |
5 |
Is the action complete? | -- | System OK | -- |
6 | The vehicle would not have started if F10 or EF30 were blown. Was a problem found? | -- | Go to Step 7 | Go to Step 8 |
7 | Replace the fuse. Is the replacement complete? | -- | System OK | -- |
8 |
Is the voltage within the specified range? | 9-16 V | Go to Step 10 | Go to Step 9 |
9 | Repair the fuse voltage supply lines for an open. Is the action complete? | -- | System OK | -- |
10 |
Is the resistance with the specified range? | ∞ ohms | Go to Step 12 | Go to Step 11 |
11 | Repair the circuit between EF30 and terminal B3 for a short to ground and open. Is the repair complete? | -- | System OK | -- |
12 |
Is the voltage within the specified range? | 9-16 V | Go to Step 13 | Go to Step 14 |
13 | Repair the circuit from EF30 to terminal B3 of the TCM for a short to power. Is the repair complete? | -- | System OK | -- |
14 |
Is the resistance within the specified range? | ∞ ohms | Go to Step 16 | Go to Step 15 |
15 | Repair the circuit between F10 and terminal C15 or C16 for a short to ground and open. Is the repair complete? | -- | System OK | -- |
16 |
Is the resistance within the specified range? | 9-16 V | Go to Step 17 | Go to Step 18 |
17 | Repair the circuit between F10 and terminal C15 or C16 for a short to power. Is the repair complete? | -- | System OK | -- |
18 |
Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 19 |
19 | Replace the TCM. Refer to Transmission Control Module Replacement . Is the replacement complete? | -- | Go to Step 20 | -- |
20 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 2 | System OK |
The transaxle control module (TCM) is an electronic device which monitors inputs to control various transaxle function including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.
• | The system voltage is less than 8.5 volts. |
• | The transaxle input voltage is too low. |
• | The engine speed is greater than 500 RPM. |
• | The malfunction indicator lamp (MIL) will illuminate. |
• | The TCM will record operating conditions at the time that 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 ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
• | The power supply cut off to the PCS valve. |
• | A 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. |
• | Inspect the poor wiring harness connector for TCM connectors and transaxle wiring connectors. |
• | Inspect the improperly formed or damaged terminals. |
Step | Action | Values | Yes | No |
---|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Automatic Transmission? | -- | Go to Step 2 | |
2 |
Is the voltage within the specified range? | 9-16 V | Go to Step 4 | Go to Step 3 |
3 |
Is the voltage within the specified range? | 9-16 V | Go to Step 4 | Go to Diagnostic System Check - Engine Electrical in Engine Electrical |
4 |
Is the voltage within the specified range? | 9-16 V | Go to Step 6 | Go to Step 5 |
5 |
Is the action complete? | -- | System OK | -- |
6 | The vehicle would not have started if F10 or EF30 were blown. Was a problem found? | -- | Go to Step 7 | Go to Step 8 |
7 | Replace the fuse. Is the replacement complete? | -- | System OK | -- |
8 |
Is the voltage within the specified range? | 9-16 V | Go to Step 10 | Go to Step 9 |
9 | Repair the fuse voltage supply lines for an open. Is the action complete? | -- | System OK | -- |
10 |
Is the resistance with the specified range? | ∞ ohms | Go to Step 12 | Go to Step 11 |
11 | Repair the circuit between EF30 and terminal B3 for a short to ground and open. Is the repair complete? | -- | System OK | -- |
12 |
Is the voltage within the specified range? | 9-16 V | Go to Step 13 | Go to Step 14 |
13 | Repair the circuit from EF30 to terminal B3 of the TCM for a short to power. Is the repair complete? | -- | System OK | -- |
14 |
Is the resistance within the specified range? | ∞ ohms | Go to Step 16 | Go to Step 15 |
15 | Repair the circuit between F10 and terminal C15 or C16 for a short to ground and open. Is the repair complete? | -- | System OK | -- |
16 |
Is the resistance within the specified range? | 9-16 V | Go to Step 17 | Go to Step 18 |
17 | Repair the circuit between F10 and terminal C15 or C16 for a short to power. Is the repair complete? | -- | System OK | -- |
18 |
Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 19 |
19 | Replace the TCM. Refer to Transmission Control Module Replacement . Is the replacement complete? | -- | Go to Step 20 | -- |
20 |
Has the last test failed or is the current DTC displayed? | -- | Go to Step 2 | System OK |