A/C Condenser Fan High Speed Circuit Troubleshooting
  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) terminal No. 6 or ECM connector terminal No. 5. 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 -
Replace the under-hood fuse/relay box. ■