Fuel Injection

The following testing procedure checks only the knock signal wire from the ignition ECU, not the sensor itself. For knock sensor test see FOR IGNITION ECU.

TESTING PROCEDURE:

NOTE: Check that coolant temperature and knock sensor connectors at engine block are not interchanged.
While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Also check ground locations for good connection. Use the wiring diagrams found in CHASSIS ELECTRICAL DIAGRAMS to supplement your testing efforts.

Color Code Legend:

Checking ECU Ground Connections:

1. Turn ignition OFF.
2. Access fuel injection ECU by removing the passenger side kick panel and glove compartment.
3. Check fuel injection ECU ground connections. They should make good contact and fit tight.

Removing ECU Connector:

4. Remove the ECU connector by pressing up the latch and folding out the wire cluster.

Removing Protective Cover:

5. Remove connector protective sleeve.
CAUTION: ^ 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.

Accessing Ignition ECU Connector:

6. Access ignition ECU by removing the panel under left hand side of instrument panel.
7. Remove ECU connector by pushing out the catch and folding out the wire cluster.
8. Check ignition ECU ground connections at intake manifold. They should make good contact.

Removing Protective Cover:

9. 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:

10. Check that terminal contacts have been pushed down evenly in connector.
11. If any connectors have been pushed down to far, poor connection may result.
12. Connect an ohmmeter between fuel injection ECU connector pin 12 and ignition ECU connector pin 15.

Reading: 0 ohm

If reading is different, repair wire (red - black) or connectors and retest.
13. Disconnect the test equipment. Reconnect the ECU and all other connectors, install the panels and glove compartment.