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 SCHEMATIC 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 from ECU and power stage to 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 2:

8. Check throttle position sensor by connecting an ohmmeter between ground and pin 7 at ECU connector.

Reading: 0 ohm (idle switch closed)

9. Depress gas pedal slightly.

Reading: should increase (idle switch open)

10. If a fault occurs, repeat these steps by measuring the resistance at the throttle position sensor. The center pin is ground.
a. If resistance reading is the same, replace the throttle position sensor and retest.
b. If resistance reading is correct, check wiring, ground and connectors. Fix as necessary.
11. Disconnect throttle position sensor.
12. Connect an ohmmeter between terminal #3 (where the violet wire would connect) and terminal #2 (center terminal).

Reading: infinite (full load switch open)

13. Turn throttle into the full load position.

Reading: 0 ohm (full load switch closed)

14. If reading is different, replace and retest with new sensor.
15. Check violet wire to Ignition ECU. Repair if necessary.

Assemble Connector:

16. Disconnect the test equipment. Reconnect the ECU and all other connectors, reinstall panel under dash.