Vehicle Speed Signal Circuit Troubleshooting

Vehicle Speed Signal Circuit Troubleshooting

Before testing:
- Check to see if diagnostic trouble code P0720 (9) is indicated. If it is,troubleshoot the DTC.
- Inspect the No.9 (10 A) fuse in the driver's under-dash fuse/relay box.
- Check for continuity between the B16 terminal and body ground (G503).

1. Raise the vehicle, and make sure it is securely supported.
2. Disconnect the connector B (22P) from the gauge assembly.




3. Connect the B2 terminal to the positive probe of a voltmeter, and connect the negative probe to body ground. To prevent damage to the gauge assembly, lay the gauge assembly on a shop rag.
4. Put the vehicle in neutral with the ignition switch ON (II).
5. Slowly rotate (over 3 mph (2 km/h)) one wheel with the other wheel blocked

Does voltage pulse from 0 to approx. 5 V or more?

YES - Replace the gauge assembly.

NO - Go to step 6.







6. Connect the No.9 terminal of the PCM connector A (32P) (except '01 model) or the No.26 terminal of the PCM connector E (31 P) ('01 model) to the positive probe of a voltmeter, and connect the negative probe to body ground.
7. Put the vehicle in neutral with the ignition switch ON (II).
8. Slowly rotate (over 3 mph (2 km/h)) one wheel with the other wheel blocked

Does voltage pulse from 0 to approx. 5 V or more?

YES - Repair open in the BLU/WHT wire between the PCM and the gauge assembly.

NO - Go to step 9.

9. Disconnect the PCM connector A (32P) (except '01 model) or E (31P) ('01 model).
10. Disconnect the driver's multiplex control unit connector B, and the cruise control unit. On Ex and EXL models: disconnect the left and right power sliding door control units.







11. Check for continuity between PCM connector A No.9 terminal or PCM connector E No.26 terminal and body ground.

Is there continuity?

YES - Repair short to ground in the BLU/WHT wire between the PCM and the gauge assembly, the cruise control unit, or the driver's multiplex control unit.

NO - Check for these problems:
- Bent, loose or corroded terminals.
- A faulty PCM.