C121A

C121A-STEERING ANGLE SENSOR NOT INITIALIZED





When Monitored:

With the ignition on.

Set Condition:

When the Anti-Lock Brake Module detects a low voltage at the Steering Angle Sensor or Steering Angle Sensor failure.

Possible Causes

TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
(A913) FUSED B(+) CIRCUIT OPEN
(Z910) GROUND CIRCUIT OPEN
STEERING CONTROL MODULE

Diagnostic Test

1. CHECK FOR A DTC C121A-STEERING ANGLE SENSOR NOT INITIALIZED





NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.

With the scan tool read and record DTC's.

With the scan tool read and record Freeze Fame information.

With the scan tool erase DTC's.

Cycle the ignition switch from off to on.

With the scan tool read and record DTC's.

Does the scan tool display: C121A-STEERING ANGLE SENSOR NOT INITIALIZED?

Yes

^ Go To 2

No

^ Refer to the INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection.
^ Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE





Check the Steering Angle Sensor installation.

Check all related wiring for bruised, chafed, pierced, or partially broken wires.

Check all related connectors for broken, bent, pushed out, or corroded terminals.

Were any problems found?

Yes

^ Repair as necessary.
^ Perform ABS VLRIFICATION TEST - VER 1. ABS Verification Test.

No

^ Go To 3

3. CHECK THE VOLTAGE ON THE (A913) FUSED B(+) CIRCUIT





Turn the ignition off.

Disconnect the Steering Control Module harness connector.

Turn the ignition on.

Measure the voltage of the (A913) Fused B(+) circuit.

Is the voltage above 10 volts?

Yes

^ Go To 4

No

^ Repair the (A913) Fused B(+) circuit for an open.
^ Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

4. CHECK THE RESISTANCE OF THE (Z910) GROUND CIRCUIT





Turn the ignition off.

Disconnect the Steering Control Module harness connector.

Measure the resistance between the (Z910) Ground circuit and ground.

Is the resistance below 5.0 ohms?

Yes

^ Replace the Steering Control Module.
^ Perform ABS VLRIFICATION TEST - VER 1. ABS Verification Test.

No

^ Repair the (Z910) Ground circuit for an open.
^ Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.