RSX L4-2.0L (2005)
Temperature Sensor (Gauge): Testing and Inspection
Coolant Temperature Gauge Troubleshooting
Before testing, check the No. 9 (7.5 A) fuse in the under-hood fuse/relay box and the No. 10 (7.5 A) fuse in the under-dash fuse/relay box.
1. Start the engine, and check the Malfunction Indicator Lamp (MIL).
Does the MIL come on?
YES - Troubleshoot the cause of the PGM-FI system DTC, and recheck.
NO - Go to step 2.
2. Check for a multiplex control unit DTC.
Is a DTC indicated?
YES - Troubleshoot the cause of the multiplex control unit DTC, and recheck.
NO - Go to step 3.
3. Do the communication line check with the self-diagnostic procedure.
Is the word "Error" indicated on the odo/trip display?
YES - The gauge cannot receive the signal from the multiplex control unit and the ECM/PCM. Check for an open in the WHT/GRN wire (gauge
connector terminal B13) or YEL wire (under-dash fuse/relay box terminal E10 and ECM/PCM terminal (E24).
NO - Go to step 4.
4. Does the gauge drive circuit check with the self-diagnostic procedure.
Does the temperature gauge needle sweep from the minimum position to the maximum, then return to the minimum position?
YES - Go to step 5.
NO - Replace the gauge assembly.
5. Substitute a known-good ECM/PCM, and recheck.
Did the symptom/indication go away?
YES - Replace the ECM/PCM.
NO - Substitute a known-good gauge assembly. If the symptom/indication goes away, replace the gauge assembly.
