Temperature Sensor (Gauge): Testing and Inspection

Coolant Temperature Gauge Symptom Troubleshooting

Coolant Temperature Gauge Needle Does Not Move at ALL
1. Check for fuel and emissions-related DTCs. If you find any, repair the problem, and clear the DTC before continuing.
2. Jump the SCS line with the Honda Diagnostic System (HDS).
3. Turn the ignition switch OFF.
4. Disconnect PCM connector B (56P).




5. Connect the PCM connector terminal B6 to body ground with a jumper wire.
6. Turn the ignition switch ON (II).

After 30 seconds or more, does the temperature gauge needle move to the hot mark?

YES - Check connections. If OK, substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM.

NO - Go to step 7.

7. Turn the ignition switch OFF, and disconnect gauge assembly connector B (18P or 22P*).
*: '04 model




8. Check for continuity between PCM connector terminal B6 and gauge assembly connector terminal B3 (or B5*).
*: '04 model

Is there continuity?

YES - Replace the fuel and temperature gauge assembly or the printed circuit board (PCB) ('03 model) or replace the gauge assembly ('04 model)..`
NO - Repair open in the wire between PCM connector terminal B6 and gauge connector terminal B3 (or B5*).
*: '04 model

Coolant Temperature Gauge Needle Goes Past the Hot Mark
1. Check for fuel and emissions related DTCs. If you find any, repair the problem, and clear the DTC before continuing.
2. Jump the SCS line with the HDS.
3. Turn the ignition switch OFF.
4. Disconnect PCM connector B (56P).
5. Turn the ignition switch ON (II), and watch the coolant temperature gauge.

Does the temperature gauge needle stay on the cold mark? (you may have to watch it for about 30 seconds.)

YES - Substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM.

NO - Go to step 6.

6. Turn the ignition switch OFF, and disconnect gauge assembly connector B (18P or 22P*).
*: '04 model




7. Check for continuity between gauge assembly connector terminal B3 (or B5*) and body ground.
*: '04 model

Is there continuity?

YES - Repair short to ground PCM connector B6 and gauge connector terminal B3 (or B5*).

NO - Replace the fuel and temperature gauge assembly or the printed circuit board (PCB) ('03 model) or replace the gauge assembly ('04 model).
*: '04 model