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.
  1. Check the No. 15 (20 A) and No. 20 (7.5 A) fuses in the under-hood fuse/relay box.
Are the fuses OK?
YES -
Go to Step 2 .
NO -
Replace the fuses, and recheck. If fuses blow again, check for a short in the No. 15 (20 A) and No. 20 (7.5 A) fuses circuit.■
  1. Jump the SCS line with the HDS.
    NOTE: This step must be done to protect the engine control module (ECM) from damage.
  1. Disconnect ECM connector A (49P) (L13Z1 engine) or ECM connector A (44P) (except L13Z1 engine).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between ECM connector A (49P) terminal No. 6 or ECM connector A (44P) terminal No. 5 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. If the wire is OK, replace the under-hood fuse/relay box. ■
  1. Turn the ignition switch to LOCK (0).
  1. Connect the ECM connector A (49P) terminal No. 6 or ECM connector A (44P) terminal No. 5 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 connector A (49P) or ECM connector A (44P). If the connections are good, substitute a known-good ECM, L13Z1 engine, R18A2 engine, K20Z4 engine, and recheck. If the symptom/indication goes away, replace the original ECM, L13Z1 engine, R18A2 engine, K20Z4 engine. ■
NO -