C0110

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Part 2 Of 2:

CIRCUIT DESCRIPTION
The pump motor is an integral part of the Brake Pressure Modulator Valve (BPMV), while the pump motor relay is integral to the Electronic Brake and Traction Control Module (EBTCM). The pump motor relay is not engaged during normal system operation. When ABS or TCS operation is required, the EBTCM activates the pump motor relay and battery power is provided to the pump motor.

CONDITIONS FOR SETTING THE DTC
^ Pump motor voltage is not present 60 milliseconds after activation of the pump motor relay.
^ Pump motor voltage is present for more than 2.5 seconds with no activation of the pump motor relay.
^ Pump motor voltage is not present for at least 40 milliseconds after the pump motor relay is commanded off.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction Diagnostic Trouble Code (DTC) stores.
^ The ABS/TCS disables.
^ The amber ABS/TCS indicator(s) turn on.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
^ 100 ignition cycles pass with no DTC(s) detected.

DIAGNOSTIC AIDS
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

^ Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness

^ The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation

^ If an intermittent malfunction exists refer to "General Electrical Diagnostic Procedures" in Diagrams for further diagnosis. A disconnected pump motor connector will cause this malfunction.


TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
4. This step checks for a short to ground in CKTs A290 and A291.
10. This step checks for an open in CKTs A290 and A291.
14. This step checks for a mechanical malfunction with the pump motor or the pump. This step also cleans the commutator and brushes of the pump motor prior to the resistance check in step 15.