Before testing

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

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

Fig 1: Connecting B2 Terminal To Positive Probe Of Voltmeter
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Put the vehicle in neutral position with the ignition switch ON (II).
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?
1. YES - Substitute a known-good gauge assembly. If the problem is gone, replace the gauge assembly.
2. NO - Go to step 6.
Turn the ignition switch off.
Connect the No. 9 terminal of the PCM connector A (32P) (except '01 model) or the No. 26 terminal of the PCM connector E (31P) ('01 model) to the positive probe of a voltmeter, and connect the negative probe to body ground.

Fig 2: Connecting No. 9 Terminal Of PCM Connector A (32P) (Except '01 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Connecting No. 26 Terminal Of PCM Connector E (31P) ('01 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch ON (II).
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?
1. YES - Repair open in the BLU/WHT wire between the PCM and the gauge assembly.
2. NO - Go to step 10.
Turn the ignition switch OFF.
Disconnect the PCM connector A (32P) (except '01 model) or E (31P) ('01 model).
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.
Check for continuity between PCM connector A No. 9 terminal or PCM connector E No. 26 terminal and body ground.

Fig 4: Checking Continuity Between PCM Connector A No. 9 Terminal & Body Ground (Except '01 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 5: Checking Continuity Between PCM Connector E No. 26 Terminal & Body Ground ('01 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. 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.
2. NO - Check for these problems:
  - Bent, loose or corroded terminals.
  - A faulty PCM.