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, R20A3 engine model, K24Z3 engine model.
  1. Check the No. 5 (20 A) and No. 21 (7.5 A) in the under-hood fuse/relay box.
Are the fuses OK?
YES -
Go to Step 2 .
NO -
Replace the fuse(s), and recheck. If fuse(s) blow again, check for a short in the No. 5 (20 A) fuse and No. 21 (7.5 A) fuse circuits.■
  1. Jump the SCS line with the HDS.
    NOTE: This step must be done to protect the engine/powertrain control module (ECM/PCM) from damage.
  1. Disconnect ECM/PCM connector A (44P) (R20A3 engine model) or ECM/PCM connector A (49P) (K24Z3 engine model).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between the ECM/PCM connector A (44P) No. 5 terminal (R20A3 engine model) or ECM/PCM connector A (49P) No. 6 terminal (K24Z3 engine model) and body ground.
Is there battery voltage?
YES -
Go to Step 6 .
NO -
Repair open in the wire between the under-hood fuse/relay box and the ECM/PCM. If the wire is OK, replace the under-hood fuse/relay box. ■
  1. Turn the ignition switch to LOCK (0).
  1. Connect the ECM/PCM connector A (44P) No. 5 terminal (R20A3 engine model) or ECM/PCM connector A (49P) No. 6 terminal (K24Z3 engine model) to body ground with a jumper wire.
  1. Turn the ignition switch to ON (II).
Does the A/C condenser fan run on high?
YES -
Check for loose wires or poor connections at ECM/PCM connector A (44P) No. 5 terminal (R20A3 engine model) or ECM/PCM connector A (49P) No. 6 terminal (K24Z3 engine model). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM, R20A3 engine model, K24Z3 engine model. ■
NO -
Go to Step 9 .
  1. Turn the ignition switch to LOCK (0), then disconnect the jumper wire.
  1. Reconnect ECM/PCM connector.
Is the relay OK?
YES -
NO -
Replace the relay circuit board.■