Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
  1. Connect the ECM connector A (44P) terminal No. 4 to body ground with a jumper wire.
  1. Turn the ignition switch to ON (II).
Do the A/C condenser and radiator fans run on low?
YES -
Check for loose wires or poor connections at ECM connector A (44P) terminal No. 4. If the connections are good, substitute a known-good ECM, R18A2 engine, K20Z4 engine, and recheck. If the symptom/indication goes away, replace the original ECM, R18A2 engine, K20Z4 engine. ■
NO -
Go to Step 16 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the radiator fan 2P connector.
  1. Turn the ignition switch to ON (II).