C1A98

Anti-Lock Control

Pinpoint Test G: DTC C1A98:54

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information [1][2]Diagrams By Number.

Normal Operation

The ABS module needs to be calibrated whenever a component specific to the Electronic Stability Control (ESC) system is disconnected or a new component is installed. Calibration allows the ABS module to identify the zero position of the sensors so the system can operate correctly.

- DTC C1A98:54 (Yaw Rate Sensor: Missing Calibration)- sets in continuous memory if the initialization sequence does not finish or if the ABS module loses the stability sensor calibration information.

This pinpoint test is intended to diagnose the following:

- ABS module calibration

PINPOINT TEST G : DTC C1A98:54

NOTE: The stability/traction control indicator (sliding car icon) flashes when a system calibration is required. Calibration is required after the ABS module or the Restraints Control Module (RCM) is replaced.

NOTE: The vehicle must be on level ground, at a complete standstill, in NEUTRAL with the brakes applied, and not on a hoist while carrying out the calibration procedure. Any vehicle movement results in calibration failure.

G1 CHECK FOR ABS MODULE DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: ABS Module Self-Test.

- Retrieve and record any ABS module DTCs.

Is any other DTC retrieved with C1A98:54?

Yes
DIAGNOSE all other DTCs first. REFER to the ABS Module DTC Chart Antilock Brakes / Traction Control Systems.

No
GO to G2.

G2 CALIBRATE THE ABS MODULE

- Using the scan tool, carry out the IVD Initialization sequence. Follow the scan tool instructions.

Does the IVD Initialization sequence complete for all of the stability sensors and does the stability/traction control indicator (sliding car icon) stop flashing and turn off?

Yes
GO to G3.

No
GO to G4.

G3 CHECK FOR RETURNING DTCs

- Using the scan tool, clear the ABS module DTCs.

- Ignition OFF.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: ABS Module Self Test.

- Retrieve and record any ABS module DTCs.

Does the DTC C1A98:54 clear and not return?

Yes
The calibration is complete. The concern may have been caused by an incorrect or incomplete calibration.

No
GO to G4.

G4 CHECK FOR CORRECT ABS MODULE OPERATION

- Disconnect: ABS Module.

- Check ABS Module connector
- corrosion

- damaged pins

- pushed-out pins


- Connect: ABS Module.

- Make sure the connector seats correctly, then operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.