Test 30A - Pump Motor Stalled (Code 68)

Test 30A: Repairing Code (68) Pump Motor Stalled (Part 1 Of 2):

Test 30A: Repairing Code (68) Pump Motor Stalled (Part 2 Of 2):

NOTE: When connecting or disconnecting connectors and inspecting connectors clean and repair as necessary.

NOTE: After completion of a repair or test then perform Verification Test. Verification Test VER-1A - ABS

NAME OF CODE:
Pump/Motor Stalled

SET CONDITION:
The following criteria must be met for this code to be detected.
1. Ignition turned on for at least 3.4 seconds.
2. Valve, power relay, and motor (ignition cycle) self-test in progress.
3. ABS power relay command given for at least 15 ms.
4. controller Antilock Brake (CAB) pump/motor command given for 500 ms and then turned off.
5. High feedback voltage from low side of motor continuously for next 100 ms.

POSSIBLE CAUSES:
- Anything that keeps motor feedback voltage high when it is expected to tee driven low by back-EMF across the rotor winding of the coasting motor
- Seized motor or pump
- 0pen CAB motor driver output
- Shorted circuit in motor winding
- short to a high voltage point in the motor feedback to the CAB microprocessor

Schematic:

Front Valve Body (HCU) Connector:

ABS Main Relay Connector/Socket:

Controller-Antilock Brake 2-Way Connector: