Pinpoint Test Bf: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) C1B00 Steering Angle Sensor

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Refer to POWER STEERING CONTROLS Wiring Diagrams for schematic and connector information.

Normal Operation and Fault Conditions

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 gear to calculate the relative and actual steering wheel angle. This value is transmitted to other modules over the HS-CAN.

Pinpoint Test Applicability
This test applies to PSCM Diagnostic Trouble Codes (DTCs) C1B00 only.
IT DOES NOT apply to any other modules or Diagnostic Trouble Codes (DTCs).

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
Verify PSCM DTC C1B00:xx is present. Verify PSCM wiring harness and electrical connectors are in good condition.

Diagnostic Aids
When DTC C1B00:62 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.

If a damaged bellows boot(s) was discovered during inspection and this pinpoint test
DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), ADDRESS the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM C1B00:49	Steering Angle Sensor: Internal Electronic Failure	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 gear or PSCM fault can also cause this DTC set.
PSCM C1B00:62	Steering Angle Sensor: Signal Compare Failure	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 gear or PSCM fault can also cause this DTC set.

Possible Sources

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.