Express 1/2 Ton Van V6-4.3L VIN W (1999)
DIAGNOSTIC AIDS
If the malfunction is intermittent, refer to Diagrams / Intermittents and Poor Connections Diagnosis.
Use a J3561 6-A when probing or checking electrical connector terminals. The J3561 6-A prevents terminal damage and inspects for proper
terminal contact tension.
Disconnecting modules and turning the ignition switch to the RUN position may cause DTCs in these modules. Inspect for DTCs in which module
upon completion of the required repair.
Ensure that the theft deterrent system has not caused a Class 2 No Communication malfunction.
TEST DESCRIPTION
2. This step isolates the fault to the vehicle or the Scan Tool.
5. This step inspects the integrity of the ground to the Scan Tool.
6. This step inspects the integrity of the power to the Scan Tool.
9. This step inspects for a faulty module causing the Class 2 line to be shorted to ground.
Scan Tool Does Not Communicate With EBCM
Scan Tool Does Not Communicate With EBCM
