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.
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 Battery Supply:

8. Check main power supply by connecting a voltmeter between pin 5 (brown) in ECU connector and ground.

Reading: approx. 12 volts

9. If no voltage registers, check wire between ECU and fuse-box located behind the center console ash tray. Check fuse #1, #3 and wiring to battery (incl. battery terminals). Repair as necessary.

Checking Pin 1:

10. Check diagnostic socket by turning ignition ON.
11. Place selector cable into pin #6.
12. Connect a voltmeter between ground and pin 1 (yellow-red) at ECU connector.

a. Reading: 12 volts.

b. Reading: 0 volt when button is depressed.

13. If O.K., diagnostic socket is working correctly. See step 24.
14. If the diagnostic socket fails the test, see next step.

Checking Socket Red-Black Wire:

15. Disconnect diagnostic socket connector.
16. Connect voltmeter between blue wire and ground.

Reading: 12 volts

Checking Socket Brown-Black Wire:

17. Connect an ohmmeter between black wire and ground.

Reading: 0 ohm

Checking Selector Cable:

18. Turn ignition OFF.
19. Connect the ohmmeter between selector cable and pin #8 under diagnostic socket.

a. Reading: infinity

b. Reading: 0 ohm when the button is depressed

Checking Diode:

20. Connect a diode tester between the diagnostic socket diode and the selector wire. Tester red (+) lead connects under diode, black (-) lead connects to the selector wire.
21. If a reading is obtained, diode is operating correctly.
22. If diagnostic socket fails any test between step 15 and 17, check wiring and connectors. Replace as needed.
23. If the socket fails test 19 to 21, replace diagnostic socket and retest.
24. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.