Ignition Control Module: Testing and Inspection

TESTING PROCEDURE:

NOTE: While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Use the wiring diagrams found in CHASSIS ELECTRICAL DIAGRAMS to supplement your testing efforts.

Accessing Power Stage:

1. Turn ignition OFF and access the power stage by removing the air filter housing top.

Disconnecting Power Stage:

2. Disconnect the power stage connector.
IMPORTANT: Ignition must be OFF when connecting or disconnecting power stage connector.
3. Remove rubber boot from connector to uncover pins. Always test the pins from the back. Never test pins from the front, damage may occur.

Checking Pin 1 And 4:

4. Check ignition coil primary winding by connecting an ohmmeter between pin 1 (red-white) and 4 (blue).

Reading: 0.6 - 1.0 ohm

Checking Coil:

5. If resistance is:
a. to low, replace ignition coil and retest.
b. to high, check resistance between coil terminals 1 and 15. Reading still to high, replace coil and retest. Reading correct, repair fault in wiring or connectors.

Checking Coil Primary Winding:

6. Check ignition coil secondary winding by connecting an ohmmeter between coil terminals 1 and high-voltage outlet.

Reading: 6.5 - 9.0 K ohms

7. If not, replace ignition coil and retest.

Checking Power Stage Ground:

8. Check power stage ground wire by connecting the ohmmeter between pin 2 (black) and ground.

Reading: 0 ohm

9. If not, repair fault in wiring or connectors.

Checking Pin 3 And 5:

10. Check that wire screen is properly connected to pin 3 (gray).

Checking Pin 4:

11. Turn ignition ON.
12. Check voltage to ignition coil and power stage by connecting a voltmeter between pin 4 and ground.

Reading: approx. 12 volts.

Checking Pin 4 With Load:

13. Operate starter motor.

Reading: minimum of 10.5V

14. If voltage to low, check battery and charging system (see STARTING AND CHARGING SYSTEMS).
15. No voltage, check blue wire from pin 4 to ignition coil to fuse box (located behind center console ash tray). Fix wiring or replace fuse as necessary.

Checking Pin 5:

16. Check connection between power stage and ignition control unit. Connect voltmeter between pin 5 and ground.
17. Crank engine and read voltmeter at same time.

Voltmeter should fluctuate: between 0 and approx. 2V

18. If all previous tests turned out positive and no spark is available at coil (high-tension outlet), replace power stage and retest.
19. Turn ignition OFF.
20. After testing, disconnect all test equipment, reconnect all connectors and place rubber boot back over connector to cover pins.