) on a DVOM, check for current flow in both directions between the A/C diode B terminals No. 1 and No. 2.
Is there current flow in only one direction?
YES - Replace the under-hood fuse/relay box.n
NO - Replace A/C diode B.n
NOTE:
| 1. | Check No. 6 (20 A) and No.15 (7.5 A) fuses in the under-hood fuse/relay box. Are the fuses OK? YES - Go to 2. NO - Replace the fuses, and recheck.n |
| 2. | Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it. Is the relay OK? YES - Go to 3. NO - Replace the A/C condenser fan relay.n |
| 3. | Measure the voltage between the A/C condenser fan relay 4P socket terminal No. 1 and body ground.
Is there battery voltage? YES - Go to 4. NO - Replace the under-hood fuse/relay box.n |
| 4. | Connect the A/C condenser fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
Does the A/C condenser fan run on high? YES - Go to 5. NO - Replace the under-hood fuse/relay box.n |
| 5. | Disconnect the jumper wire. |
| 6. | Turn the ignition switch ON (II). |
| 7. | Measure the voltage between the A/C condenser fan relay 4P socket terminal No. 4 and body ground.
Is there battery voltage? YES - Go to 8. NO - Go to 13. |
| 8. | Turn the ignition switch OFF. |
| 9. | Reinstall the A/C condenser fan relay. |
| 10. | Disconnect ECM/PCM connector A (44P). |
| 11. | Connect the ECM/PCM connector A (44P) terminal No. 5 to body ground with a jumper wire.
|
| 12. | Turn the ignition switch 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) terminal No. 5. If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM, then do the ECM/PCM idle learn procedure, except K20Z2 engine, K20Z2 engine.n NO - Repair open in the wire between the A/C condenser fan relay and the ECM/PCM.n |
| 13. | Remove A/C diode B from the under-hood fuse/relay box. |
| 14. | Turn the ignition switch ON (II). |
| 15. | Measure the voltage between the A/C diode B 2P socket terminal No. 2 and body ground.
Is there battery voltage? YES - Go to 16. NO - Replace the under-hood fuse/relay box.n |
| 16. | Using the diode setting () on a DVOM, check for current flow in both directions between the A/C diode B terminals No. 1 and No. 2.
Is there current flow in only one direction? YES - Replace the under-hood fuse/relay box.n NO - Replace A/C diode B.n |