Vehicle Speed 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.

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 fuse #1 (located in central electric unit behind ash tray) to interrupt the power supply. Then remove the ECU connector by pressing up the latch and folding out the wire cluster.

Removing Protective Sleeve:

5. Remove connector protective sleeve and reinstall fuse #1 for testing.
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.

Checking Resistance Of Speedometer Signal Wire:

6. Remove panel under instrument panel on driver side.
7. Disconnect the violet-white (VO-W) wire from the instrument cluster.
8. Connect an ohm meter between violet-white (VO-W) wire and pin 34 of ECU connector.

Reading: 0 ohm

9. If reading is correct and connectors are in good condition, speedometer signal is missing. Fault is not ECU related. Use wiring diagrams (see SCHEMATIC DIAGRAMS) to diagnose the problem.
10. If reading is different, check wiring and connectors, repair as needed.
11. Disconnect the test equipment. Remove the #1 fuse and reconnect the ECU and all other connectors, install the kick panel and glove compartment. Ensure that the rubber seal in the ECU connector is installed before it is connected to the unit.
12. Reinstall the #1 fuse.