Engine Load Signal: 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 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.
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 and wiring to battery (incl. battery terminals). Repair as necessary.

Checking Engine Load Signal Wire:

10. Remove panel under right-hand side kick panel. Make sure ignition is in the off position. Remove glove box and undo fuel injection ECU connector.
11. Connect an ohmmeter and measure the resistance between pin 8 of ignition ECU and pin 25 of fuel injection ECU connectors.

Reading: 0 ohm

12. If ohmmeter gives different reading, check wiring and connectors. If they are in good condition, either ignition or fuel injection ECU is faulty or check ECUs as described by COMPONENT TESTING under TESTING PROCEDURES. Repair as needed.
13. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connectors) and remount all panels.
14. Erase fault codes and test drive vehicle. Recheck for fault codes.