For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C1550 36: ECU Failure EEPROM failureDTC C1550 37: ECU Failure watchdog/safety failure
DTC C1550 38: ECU Failure supervision software failure
DTC C1550 39: ECU Failure internal electronic failure
DTC C1550 3A: ECU Failure incorrect component installed
Circuit/System Description
Conditions for Running the DTC
DTC C1550 38
Engine starting
DTC C1550 36
Engine running
DTC C1550 39
| • | Engine starting |
| • | Engine running |
Conditions for Setting the DTC
DTC C1550 36, 38, 39
| • | Control unit software/hardware failure. |
| • | Above condition must be fulfilled for at least 0 seconds. |
Action Taken When the DTC Sets
DTC C1550 36
No steering boost function
DTC C1550 38
The system function is not affected.
DTC C1550 39
| • | The steering boost is switched off. |
| • | The system function is not affected. |
Conditions for Clearing the DTC
A history DTC will clear after 60 consecutive malfunction-free ignition cycles.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Steering System Description and Operation
Electrical Information Reference
Circuit/System Verification
- Verify that DTC C1550 is not set.
| ⇒ | If the DTC is set, reprogram the PSCM. If the DTC resets, replace the PSCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
