Cylinder Identification Sensor: 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.

Checking Ground Connections:

4. Check ignition ECU ground connections from ECU and power stage to 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 Pins 18 And 19:

8. Connect an ohmmeter between ECU connector pins 18 and 19.

Reading: 0 ohm

If not, check wiring to sensor and repair if necessary. If wiring is in good working order, replace and retest with new No. 1 cylinder sensor.
9. Check that ground lead (black) is connected to pin 21.
10. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.