DTC P0725 Europe Emissions
Circuit Description
The transmission control module (TCM) is an electronic device which monitors inputs to control various transmission functions including shift quality and transmission sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transmission output functions and devices.
DTCs P0725, P0726 and P0727 are related to the same circuit. These DTCs will not illuminate the malfunction indicator lamp (MIL), however, the DTCs will be stored in memory.
The following information is transmitted between the TCM and the engine control module (ECM) through the controller area network (CAN) line:
| • | Engine malfunction signal |
| • | Engine speed |
| • | Engine output torque reduction signal |
| • | Engine coolant temperature (ECT) |
Conditions for Setting the DTC
| • | The engine speed is greater than 7,000 RPM. |
| • | The system voltage is too high or too low. |
| • | The CAN transmitting wiring harness is shorted or open. |
| • | The TCM or ECM is defective. |
Action Taken When the DTC Sets
| • | No lamp control is required, but diagnostic information should be stored immediately when a malfunction is detected. |
| • | Adopt Emergency/Substitute mode and constant 4th gear. |
| • | Open lock up clutch |
Conditions for Clearing the DTC
| • | A history DTC will clear after 40 consecutive warm-up cycles without a fault. |
| • | Clear the DTCs with a scan tool. |
Diagnostic Aids
| • | Inspect the poor wiring harness connection for TCM connectors and transmission 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 speed within the specified range? | 0-7,000 RPM | Go to Diagnostic Aids | Go to Step 3 |
3 |
Is the resistance within the values shown? | 0 ohms | Go to Step 5 | Go to Step 4 |
4 | Repair the malfunctioning terminals, as necessary. Is the action complete? | -- | System OK | -- |
5 |
Is the resistance within the specified range? | 11-14 V | Go to Step 6 | Go to Step 7 |
6 | Repair the short to power. Is the action complete? | -- | System OK | -- |
7 | Inspect the engine speed. Was a condition found? | -- | Go to Diagnostic System Check - Engine Controls in Engine Controls-2.0L. | Go to Step 8 |
8 |
Is DTC P0725 set? | -- | Go to Step 9 | Go to Step 10 |
9 | Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls-2.0L. Is the action complete? | -- | Go to Step 10 | -- |
10 |
Did the test fail or is the current DTC displayed? | -- | Go to Step 2 | System OK |
DTC P0725 N American Emissions
Circuit Description
The transmission control module (TCM) is an electronic device which monitors inputs to control various transmission functions including shift quality and transmission sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transmission output functions and devices.
DTCs P0725, P0726 and P0727 are related to the same circuit. These DTCs will not illuminate the malfunction indicator lamp (MIL), however, the DTCs will be stored in memory.
The following information is transmitted between the TCM and the engine control module (ECM) through the controller area network (CAN) line:
| • | Engine malfunction signal |
| • | Engine speed |
| • | Engine output torque reduction signal |
| • | Engine coolant temperature (ECT) |
Conditions for Setting the DTC
| • | The engine speed is greater than 7,000 RPM. |
| • | The system voltage is too high or too low. |
| • | The CAN transmitting wiring harness is shorted or open. |
| • | The TCM or ECM is defective. |
Action Taken When the DTC Sets
| • | No lamp control is required, but diagnostic information should be stored immediately when a malfunction is detected. |
| • | Adopt Emergency/Substitute mode and constant 4th gear. |
| • | Open lock up clutch |
Conditions for Clearing the DTC
| • | A history DTC will clear after 40 consecutive warm-up cycles without a fault. |
| • | Clear the DTCs with a scan tool. |
Diagnostic Aids
| • | Inspect the poor wiring harness connection for TCM connectors and transmission 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 speed within the specified range? | 0-7,000 RPM | Go to Diagnostic Aids | Go to Step 3 |
3 |
Is the resistance within the values shown? | 0 ohms | Go to Step 5 | Go to Step 4 |
4 | Repair the malfunctioning terminals, as necessary. Is the action complete? | -- | System OK | -- |
5 |
Is the resistance within the specified range? | 11-14 V | Go to Step 6 | Go to Step 7 |
6 | Repair the short to power. Is the action complete? | -- | System OK | -- |
7 | Inspect the engine speed. Was a condition found? | -- | Go to Diagnostic System Check - Engine Controls in Engine Controls-2.5L. | Go to Step 8 |
8 |
Is DTC P0725 set? | -- | Go to Step 9 | Go to Step 10 |
9 | Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls-2.5L. Is the action complete? | -- | Go to Step 10 | -- |
10 |
Did the test fail or is the current DTC displayed? | -- | Go to Step 2 | System OK |
