DTC P0603 Non Europe or N American Emissions
Circuit Description
A normal function of the transmission control module (TCM) programming is to perform an internal check that verifies the integrity of the keep alive memory (KAM) allocations.
The DTC P0603 sets when the KAM is not operating correctly when checked on initialization. An area of KAM is failed a read/write test.
Conditions for Setting the DTC
| • | The checksum of the current regulator data will be tested. If the checksum is not OK, then the error bit will be set. |
| • | If writing to FLASH during power latch phase failed |
| • | Each of the flash blocks has its own status which is located at the beginning of each flash block and the status of the FLASH blocks do not fit together. |
| • | The system voltage is too high or too low. |
| • | The transaxle input voltage is too high or too low. |
Action Taken When the DTC Sets
| • | The hold lamp will blink. |
| • | 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 ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
| • | Power supply cut off to the PCS valve. |
Conditions for Clearing the Hold Lamp/DTC
| • | 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. |
Diagnostic Aids
When DTC P0603 sets, the possible cause of the fault could be the TCM.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Automatic Transmission? | Go to Step 2 | |
2 |
Does the scan tool display DTC P0603? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Is the action complete? | Go to Step 4 | -- |
4 |
Does the scan tool indicate that this diagnostic has run and passed? | Go to Step 5 | Go to Step 2 |
5 | Check if any DTCs are set. Are any DTCs displayed that have not been diagnosed? | System OK |
DTC P0603 European and N American Emissions
Circuit Description
A normal function of the transmission control module (TCM) programming is to perform an internal check that verifies the integrity of the keep alive memory (KAM) allocations.
The DTC P0603 sets when the KAM is not operating correctly when checked on initialization. An area of KAM is failed a read/write test.
Conditions for Setting the DTC
| • | The checksum of the current regulator data will be tested. If the checksum is not OK, then the error bit will be set. |
| • | If writing to FLASH during power latch phase failed |
| • | Each of the flash blocks has its own status which is located at the beginning of each flash block and the status of the FLASH blocks do not fit together. |
| • | The system voltage is too high or too low. |
| • | The transaxle input voltage is too high or too low. |
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 ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
| • | Power supply cut off to the PCS valve. |
Conditions for Clearing the MIL/DTC
| • | 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. |
Diagnostic Aids
When DTC P0603 sets, the possible cause of the fault could be the TCM.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Automatic Transmission? | Go to Step 2 | |
2 |
Does the scan tool display DTC P0603? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Is the action complete? | Go to Step 4 | -- |
4 |
Does the scan tool indicate that this diagnostic has run and passed? | Go to Step 5 | Go to Step 2 |
5 | Check if any DTCs are set. Are any DTCs displayed that have not been diagnosed? | System OK |
