Ignition

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. 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, #3 and wiring to battery (incl. battery terminals). Repair as necessary.

Checking Temperature Sensor:

10. To check the coolant temperature sensor, connect an ohmmeter between ECU connector pin 2 (red-black) and ground.

Coolant Temperature Resistance Chart:

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

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

12. 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.
13. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.