Ignition ECM

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 Crankshaft Position/Speed Sensor:

10. Check crankshaft position/speed sensor by connecting an ohmmeter between pin 10 (red) and 23 (blue). Reading should be:

Sensor 1389399-5 (older type) -- 240 ± 25 ohms @ 20° C
Sensor 3547847-8 (newer type)
or 1389399-5 with white dot -- 170 ± 30 ohms @ 20° C

11. If value is incorrect, check wiring. If wiring is O.K., replace crankshaft position/speed sensor.

Checking Screen Connection:

12. Check that screening is connected to pin 11. Fix if necessary.
13. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.