Pinpoint Test H: DTCs C1A99:14, C1A99:17, C1A99:2F, C1A99:62, C1A99:65 and C1A99:67

Anti-Lock Control

Pinpoint Tests

Pinpoint Test H: DTCs C1A99:14, C1A99:17, C1A99:2F, C1A99:62, C1A99:65 and C1A99:67

Normal Operation

The ABS module uses internal pressure sensors to determine correct operation by monitoring internal Hydraulic Control Unit (HCU) hydraulic pressures. These DTCs set if the brake pressure sensor signals do not match. This fault could set by either an internal ABS module failure or an HCU pressure sensor failure. The pressure sensors are internal to the HCU and cannot be serviced separately.





This pinpoint test is intended to diagnose the following:
- Stoplamp switch
- Brake pedal assembly
- ABS module
- HCU

PINPOINT TEST H: DTCs C1A99:14, C1A99:17, C1A99:2F, C1A99:62, C1A99:65 AND C1A99:67

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H1 CHECK THE BRAKE PEDAL AND BRACKET


- Inspect the stoplamp switch and brake pedal assembly. Verify there is no brake pedal pressure unintentionally applied due to incorrect stoplamp switch or brake pedal installation.
- Are the stoplamp switch and brake pedal OK?

Yes
GO to H2.

No
REPAIR or INSTALL new components as necessary. REFER to Hydraulic Brake Actuation Service and Repair.

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H2 CHECK FOR DTCs C1A99:14, C1A99:17, C1A99:2F, C1A99:62, C1A99:65, C1A99:67 TO RETURN


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - Clear All Continuous Memory Diagnostic Trouble Codes (CMDTCs).
- Disconnect the scan tool.
- Test drive the vehicle at speeds greater than 32 km/h (20 mph).
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: ABS Module Self-Test.
- Carry out the ABS module self-test.
- Are DTCs C1A99:14, C1A99:17, C1A99:2F, C1A99:62, C1A99:65 or C1A99:67 present?

Yes
GO to H3.

No
The system is operating correctly at this time. The concern may have been caused by air trapped in the hydraulic brake system. CLEAR the DTCs. REPEAT the self-test.

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H3 CHECK FOR CORRECT ABS MODULE HCU TORQUE VALUES


- Verify all ABS module-to- HCU fasteners are tightened to the correct torque specifications. Refer to Specifications.
- Are the ABS module-to-HCU fasteners installed correctly?

Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. TEST the system for normal operation.

No
TIGHTEN all ABS module-to-HCU fasteners. REFER to Hydraulic Control Unit (HCU) Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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