A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE:

Do not use this troubleshooting procedure if 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 ).

Check the No. B30 (30 A) fuse in the under-hood fuse/relay box, and the No. C26 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Are the fuses OK?

YES -Go to step 2.

NO -Replace the fuse(s), and recheck. If the fuse(s) blow again, check for a short in the No. B30 (30 A) fuse and the No. C26 (7.5 A) fuse circuits.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM from damage.
Disconnect PCM connector A (49P).
Turn the ignition switch to ON (II).
Measure the voltage between PCM connector A (49P) terminal No. 5 and body ground.

Fig 1: Measuring Voltage Between PCM Connector A (49P) Terminal No. 5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 6.

NO -Repair an open in the wire between the under-hood fuse/relay box and the PCM. If the wire is OK, replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
Turn the ignition switch to LOCK (0).
Connect PCM connector A (49P) terminals No. 4, No. 5, and No. 6 to body ground with jumper wires.

Fig 2: Identifying Jumper Wire Connection Between PCM Connector A (49P) Terminals No. 4, No. 5 And No. 6 To Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Does the A/C condenser fan and the radiator fan run on high?

YES -Check for loose wires or poor connections at PCM connector A (49P) terminals No. 4, No. 5, and No. 6. If the connections are good, substitute a known-good PCM (see SUBSTITUTING THE PCM ), and recheck. If the symptom/indication goes away, replace the original PCM (see PCM REPLACEMENT ).

NO -Go to step 9.
Turn the ignition switch to LOCK (0).
Remove the fan control relay from under-hood fuse/relay box.
Check for continuity between fan control relay 5P socket terminal No. 2 and body ground.

Fig 3: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

NO -Check for an open in the wire between the under-hood fuse/relay box and body ground. If the wire is OK, check for poor ground at G203 (see ENGINE MOUNT CONTROL SOLENOID SUBHARNESS (AA) ).