A/C Condenser Fan High Speed Circuit Troubleshooting

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

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 any symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Remove the fan control relay from the relay block, and test it (see RELAY CONTROL MODULE TEST ).
Is the relay OK?

YES - Go to step 2.

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

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

Is there battery voltage?

YES - Go to step 4.

NO - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
Turn the ignition switch to LOCK (0).
Check for continuity between the fan control relay 5P socket No. 2 terminal and body ground.

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

Is there continuity?

YES - Go to step 6.

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 G202 (see GROUND TO COMPONENTS INDEX ).
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
Disconnect PCM connector A (49P).
Check for continuity between the fan control relay 5P socket No. 3 terminal and PCM connector A (49P) No. 5 terminal.

Fig 3: Identifying Continuity Between Fan Control Relay 5P Socket No. 3 And No. 5 Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Check for loose wires or poor connections at PCM connector A (49P) No. 5 terminal. If the connections are good, substitute a known-good PCM, and recheck. If the symptom/indication goes away, replace the original PCM (see PCM REPLACEMENT ).

NO - Repair open in the wire between the fan control relay and the PCM.