Metro, Prizm 2000-2002

Diagnosis & Testing


Diagnostic System Check

ABS testing requires the use of an OBD-II compliant scan tool

An intermittent malfunction in the electronic system may be very difficult to detect and to accurately diagnose. The EBCM tests for different malfunctions under different vehicle conditions. For this reason, a thorough test drive is often needed in order to repeat a malfunction. If the system malfunction is not repeated during the test drive, a good description of the complaint may be very useful in locating an intermittent malfunction. Faulty electrical connections or wiring causes most intermittent problems. When an intermittent condition is suspected, check the suspect circuits for the following conditions:

Poor mating of connector halves or backed out terminals
Improperly formed or damaged terminals
Wire chafing
Poor wire to terminal connections
Dirty or corroded terminals
Damage to connector bodies
If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Perform a thorough inspection of all related wiring and connectors pertaining to the history DTC stored.

The number(s) below refer to the step number(s) on the diagnostic table. Lack of communication may be due to a malfunction of the class 2 serial data circuit.

  1. Install a scan tool. Does the scan tool power up- If yes, go to step 2.
  3. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the EBCM. Does the scan tool communicate with the EBCM- If yes, go to step 3.
  5. Select the ABS display DTCs function on the scan tool.
  7. Does the scan tool display any DTCs- If yes, clear the codes before proceeding.