Pinpoint Test AC: DTCs C1029:00, C102B:00

Anti-Lock Control - Hybrid

Pinpoint Test AC: DTCs C1029:00, C102B:00

Normal Operation

The primary channel consists of the RF and LR hydraulic circuits, and the secondary brake channel consists of the LF and RR hydraulic circuits. Pressure imbalances between the primary or secondary hydraulic pressure could be caused by air in the lines or fluid leaks in the brake fluid system.

- C1029:00 (ABS Primary Circuit Pressure Lower Than Secondary: No Sub type Information)- this DTC sets if the ABS module detects that the pressure in the primary circuit is less than in the secondary circuit.

- C102B:00 (ABS Secondary Circuit Pressure Lower Than Primary: No Sub Type Information)- this DTC sets if the ABS module detects that the pressure in the secondary circuit is less than in the primary circuit.

This pinpoint test is intended to diagnose the following:

- Air in brake fluid system

- Master Cylinder

- Hydraulic Control Unit.

PINPOINT TEST AC : DTC C1029:00, C102B:00

AC1 BLEED THE BRAKES

- Bleed the brakes.
- Clear the DTCs.

- Road test the vehicle.


Is the concern still present?

Yes
GO to AC2
No
The system is operating correctly at this time. The concern may have been caused by air in the brake system.

AC2 MONITOR THE ABS PRIMARY AND SECONDARY CHANNEL PRESSURES

- Connect the scan tool.

- Ignition ON.

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

- Select the following PIDs to monitor the primary and secondary channels.
- Left front brake pressure (LF_BRK_PRS)

- Right rear brake pressure (RR_BRK_PRS)

- Right front brake pressure (RF_BRK_PRS)

- Left rear brake pressure (LR_BRK_PRS)


- Depress the brake pedal firmly and note the brake pressures displayed by each PID.

- Add the pressures for the left front brake pressure and the right rear brake pressure together (secondary channel).

- Add the pressures for the right front brake pressure and the left rear brake pressure together (primary channel).

Are the primary and secondary channel pressures within 10% of each other?

Yes
CLEAR the DTCs, REPEAT the self-test. If C1029:00 or C102B:00 returns, INSTALL a new HCU (Hydraulic Control Unit). REFER to Hydraulic Control Unit (HCU) .

No
CLEAR the DTCs, REPEAT the self-test. If C1029:00 or C102B:00 returns, INSTALL a new brake master cylinder.