Test Description
Number(s) below refer to the step number(s) on the Diagnostic Chart .
- 5. An obvious cause of low fuel pressure would be an empty fuel tank.
- 6. The engine will easily start and run if a few injectors are disabled. It is not necessary to test all injectors at this time since this step is only a test to verify that all of the injectors have not been disabled by fuel contamination.
- 7. A blinking test light verifies that the ECM is monitoring the 58X crankshaft reference signal and is capable of activating The injectors. If there is an open or shorted driver circuit, DTCs 201 -206 and a misfire DTC 300 - 306 should be set.
- 13. By using a spark tester, each ignition coil's ability to produce 25, 000 volts is verified.
- 19. If there is an open or shorted driver circuit, DTCs 201 - 206 and a misfire DTC 301 - 306 should be set. All six injector driver circuits can be checked at one time without removing the intake manifold if a J 39021 - 95 test light is available. This is the alternative procedure:
- With the ignition "OFF", disconnect the gray connector located at the rear of the air filter, attached to a bracket on the purge canister.
- Connect test light J 39021 - 95 to the connector. Do any of the light constantly illuminate or fail to blink when the engine is cranked? If so, repair the short or open circuit, or replace the ECM if indicated.
This procedure only tests the driver circuit as far as the test connection, so step 25 is added to test the circuit all the way to the injector.