Part 2 of 2

Chart A-3 (2 of 2):

Wiring Diagram For Engine No Start:

CIRCUIT DESCRIPTION:

This chart assumes that the battery condition, engine cranking speed, and fuel quantity are OK.

TEST DESCRIPTION: The numbers below refer to circled numbers on the diagnostic chart.

1. No fuel spray from one injector indicates a faulty fuel injector. If the test light "flashes" while cranking, then the ECM should be considered OK. Use an injector test light like B T8320 or equivalent, to test injector circuit. A blinking light indicates the ECM is controlling the injector.

NOTE: Be sure the test light makes good contact between connector terminals during the test. The brightness of the test light is not important.

2. Circuit 481 supplies ignition voltage to the injectors. Probe each connector terminal with a test light to ground. There should be a light "ON" at one terminal of each connector. If the test light confirms ignition voltage at the connector, the ECM injector control circuits 467 or 468 may be open. Reconnect the injector, and using a test light connected to ground, check for a light at the applicable ECM connector terminal. A light at this point indicates that the injector drive circuit involved is OK. If an ECM repeat failure has occurred, the injector is shorted. Replace the injector and ECM.

CAUTION: Not all SCAN testers are compatible with every system. A SCAN tool that produces faulty readings should NOT be used, and the problem should be reported to the tool manufacturer. Use of a faulty SCAN tool can result in improper diagnosis and unnecessary component replacement. Follow the proper instructions, located in the owners manual, for the specific SCAN tool being used.