Test Description

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

1. 4. This step tests for voltage at the fuel injector harness connector. The ECM-I fuse supplies power to the coil side of the fuel injector harness connector. If the fuse is open, a short to ground on the fuel injector B+ supply circuit is indicated.
2. 5. This step verifies that the PCM is able to control the fuel injector. If the test lamp blinks, then the PCM and wiring are OK.
3. 6. This step tests if a ground is constantly being applied to the fuel injector.

Fig 1: DTC P0200 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0200 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.