A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE:

Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
Before doing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Check the No. B31 (7.5 A) and the No. B47 (30 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -Go to step 2.

NO -Replace the fuse, and recheck. If the fuse blow again, check for a short in the No. B31 (7.5 A) or No. B47 (30 A) fuse circuits.
Remove the fan control relay from auxiliary under-hood relay box A, and test it (see POWER RELAY TEST ).
Is the relay OK?

YES -Go to step 3.

NO -Replace the fan control relay.
Turn the ignition switch to ON (II).
Measure the voltage between fan control relay 5P socket terminal No. 13 and body ground.

Fig 1: Measuring Voltage Between Fan Control Relay 5P Socket Terminal No. 13 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 5.

NO -Go to step 14.
Turn the ignition switch to OFF.
Check for continuity between fan control relay 5P socket terminal No. 5 and body ground.

Fig 2: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 7.

NO -Check for an open in the wire between the fan control relay and body ground. If the wire is OK, check for poor ground at G401 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (BF) ).
Remove the A/C condenser fan relay from auxiliary under-hood relay box B.
Check for continuity between fan control relay 5P socket terminal No. 15 and A/C condenser fan relay 4P socket terminal No. 10.

Fig 3: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 15 And A/C Condenser Fan Relay 4P Socket Terminal No. 10
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 10.

NO -Repair an open in the wire between the fan control relay and the A/C condenser fan relay.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the ECM/PCM from damage.
Disconnect ECM/PCM connector A (44P).
Check for continuity between A/C condenser fan relay 4P socket terminal No. 10 and ECM/PCM connector A (44P) terminal No. 5.

Fig 4: Checking Continuity Between A/C Condenser Fan Relay 4P Socket Terminal No. 10 And ECM/PCM Connector A (44P) Terminal No. 5
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 12.

NO -Repair an open in the wire between the A/C condenser fan relay and the ECM/PCM.
Reconnect ECM/PCM connector A (44P).
Check the DTCs by selecting the DTC MENU (DTCs) from the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).
Is DTC P0532, P0533, P2184 and/or P2185 indicated?

YES -
- DTC P0532 indicated: Go to A/C pressure sensor circuit low voltage troubleshooting (see DTC P0532: A/C PRESSURE SENSOR CIRCUIT LOW VOLTAGE ).
- DTC P0533 indicated: Go to A/C pressure sensor circuit high voltage troubleshooting (see DTC P0533: A/C PRESSURE SENSOR CIRCUIT HIGH VOLTAGE ).
- DTC P2184 indicated: Go to ECT sensor 2 circuit low voltage troubleshooting (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ).
- DTC P2185 indicated: Go to ECT sensor 2 circuit high voltage troubleshooting (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE ).
NO -Check for loose wires or poor connections at ECM/PCM connector A (44P). If the connections are good, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the symptom/indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
Remove the A/C condenser fan relay from auxiliary under-hood relay box B.
Measure the voltage between A/C condenser fan relay 4P socket terminal No. 10 and body ground.

Fig 5: Measuring Voltage Between A/C Condenser Fan Relay 4P Socket Terminal No. 10 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Repair an open in the wire between the A/C condenser fan relay and the fan control relay.

NO -Repair an open in the wire between the No. B31 fuse in the under-dash fuse/relay box, A/C diode A and the A/C condenser fan relay.