DTC C1242 BPMV Pump Motor Ground Circuit Open. Chevrolet Corvette 1997

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1997 🢒 Corvette 🢒 Brakes 🢒 ABS Brakes - Delco/Bosch 🢒 DTC C1242 BPMV Pump Motor Ground Circuit Open

Circuit Description

The BPMV pump motor ground is supplied through a ground stud on the pump motor to a good ground.

Conditions for Setting the DTC

DTC C1242 can be set when the pump relay is commanded OFF. A malfunction exists if the pump motor ground CKT 1250 resistance is greater than 6900 ohms.

Action Taken When the DTC Sets

A malfunction DTC is stored, ABS/TCS is disabled and the ABS and Traction Control indicators are turned ON.

Conditions for Clearing the DTC

•	Condition for DTC is no longer present and scan tool clear DTC function is used.

•	Fifty ignition cycles have passed 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.

•	An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.

•	If an intermittent malfunction exists refer to General Electrical Diagnosis in Wiring Systems.

Test Description

The numbers below refer to step numbers on the diagnostic table.

Checks for good pump motor ground.

Checks for good pump motor ground through the BPMV.

DTC C1242 BPMV Pump Motor Circuit Open

Step	Action	Value(s)	Yes	No
1	Was the Diagnostic System Check performed?	--	Go to Step 2	Go to Diagnostic System Check
2	Turn the ignition switch to the OFF position. Using J 39200 DMM, measure resistance between the motor ground stud and a good chassis ground. Is the resistance within the range specified in the Value(s) column?	0 - 2ohms	Go to Step 3	Go to Step 8
3	Disconnect the EBTCM connector. Remove the EBTCM from BPMV. Inspect the EBTCM to BPMV connector for conditions which could cause intermittents, such as damage, corrosion, poor terminal contact, or presence of brake fluid. Refer to General Electrical Diagnosis in Wiring Systems. Is connector OK and cavity free of brake fluid?	--	Go to Step 4	Go to Step 5
4	Using J 39200 DMM, measure resistance between BPMV internal connector terminal 8 and motor ground stud. Is the resistance within the range specified in the Value(s) column	0.2 - 10ohms	Go to Step 6	Go to Step 7
5	If connector corrosion or damage is evident, replace BPMV and/or EBTCM as necessary. If brake fluid is present, replace BPMV and EBTCM. Is the replacement complete?	--	Go to Diagnostic System Check	--
6	Replace the EBTCM. Refer to Electronic Brake and Traction Control Module . Is repair complete?	--	Go to Diagnostic System Check	--
7	Replace the BPMV. Refer to Brake Pressure Modulator Valve . Is repair complete?	--	Go to Diagnostic System Check	--
8	Repair open or high resistance in CKT 1250. Refer to Wiring Repairs in Wiring Systems. Is repair complete	--	Go to Diagnostic System Check	--