Ignition

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 Ignition ECU Connector:

1. Turn ignition OFF.
2. Access ignition ECU by removing the panel under left hand side of instrument panel.
3. Remove ECU connector by pushing out the catch and folding out the wire cluster.

Checking Ground Connections:

4. Check ignition ECU ground connections at intake manifold. They should make good contact.

Removing Protective Cover:

5. Remove connector protective sleeve.
IMPORTANT: ^ Never check connections from the front. Connectors can get damaged and worsen the problem.
^ Check connections through the holes in the connector.
^ Connection pin numbers are printed on the connector side.

Checking Terminal Pins:

6. Check that terminal contacts have been pushed down evenly in connector.
7. If any connectors have been pushed down to far, poor connection may result.

Checking Pin 6:

8. Turn ignition ON.
9. Connect a voltmeter between pin 6 (blue) at ECU connector and ground (checking ignition switch power supply).

Reading: approx. 12 volts

10. If not, check wiring and connectors. If no fault found, replace ignition switch and retest.

Checking Pins 6 And 20:

11. Connect the voltmeter between pin 6 (blue) and pin 20 (brown).

Reading: approx. 12 volts

12. If not, check wiring (pin 20 to ground) and fix as necessary.
13. Turn ignition OFF.

Checking Pin 3:

14. Check test connector wiring by connecting an ohmmeter between pin 3 and ground.

Reading: infinite

15. If not, check wiring and fix as necessary.
16. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.
17. The previous tests eliminate any power supply or ECU ground problems. If an ECU fault is suspected, go by the FLOW OF DIAGNOSIS or see next step.
18. To find the problem, you can test every input and output device. If no faults are found and all wiring, connectors, fuses and the battery are in good condition, replace ECU and retest with known good unit.