Pinpoint Test Bf: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) C1B00 Steering Angle Sensor - EPAS (Electronic Power Assist Steering)
Refer to POWER STEERING CONTROLS for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Power Steering - System Operation and Component Description
Description
- Description
- While the ignition is ON and the voltage supply to the PSCM is above 6 volts, the module monitors the motor inside the EPAS column to calculate the relative and actual steering wheel angle. This value is transmitted to other modules over the HS-CAN.
Pinpoint Test Applicability
- Pinpoint Test Applicability
- This test applies to PSCM DTC C1B00:49 or C1B00:62 only. It
DOES NOT apply to any other modules or Diagnostic Trouble Codes (DTCs).
DTC Diagnostic Strategy
- DTC Diagnostic Strategy
- If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).
Pinpoint Test Purpose
- Pinpoint Test Purpose
- Verify PSCM DTC C1B00:XX is present. Verify PSCM wiring harness and electrical connectors are in good condition.
Diagnostic Aids
- Diagnostic Aids
- When DTC C1B00:49 is set, the PSCM removes steering assist, enters into manual mode and transmits an invalid steering angle message over the HS-CAN. The module also sends a message to the IPC to display
POWER STEERING ASSIST FAULT in the message center.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PSCM C1B00:49 | Steering Angle Sensor: Internal Electronic Failure | If the PSCM detects an invalid steering angle, the steering system has not been calibrated, the internal steering angle exceeds or falls below the calculated value, DTC C1B00:49 is set. |
| PSCM C1B00:62 | Steering Angle Sensor: Signal Compare Failure | If the PSCM detects an invalid steering angle sensor when compared to index sensor and redundant steering angle signal or the steering angle is out of range, DTC C1B00:62 is set. |
Possible Sources
- Steering column internal failure
- PSCM internal failure
Visual Inspection and Pre-checks
- This DTC sets if the sum of the 2 steering shaft torque sensors do not equal a specified voltage level. This can occur if the wiring harness is damaged, chewed or the connectors are loose or damaged. An internal steering column or PSCM fault can also cause this DTC set. For additional fault setting information, refer to Diagnostic Trouble Code (DTC) Chart .
- Refer to Steering GSB for additional connector and wiring inspection tips