Fuel Injection

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.

Fuel Injection, Ignition Control Unit (ECU) And System Relay:

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.

Disconnecting ECU Connector:

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

Removing Protective Sleeve:

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.

Testing ECU Pin 13:

6. Check temperature sensor by connecting an ohm meter between ground and ECU connector pin 13.

Coolant Temperature Resistance Chart:

7. Resistance depending on coolant temperature should be (also see chart):

-10°C (14°F) 8,260 - 10,560 ohms
+20°C (68°F) 2,280 - 2,720 ohms
+80°C (176°F) 290 - 364 ohms

8. If a fault occurs, measure at coolant temperature sensor to see if the sensor or the wiring is the problem.
a. If reading is the same at the sensor, replace sensor and retest.
b. If reading at sensor is correct, check wiring and ground connection at intake manifold.
9. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.