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DTC Troubleshooting

DIAGNOSIS PROCEDURE

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2  Check wire circuit 
  1. Disconnect A/C condenser fan control relay (1) from relay / fuse box with ignition switch turned OFF.
  2. Turn ON ignition switch, measure voltage between engine ground and "LT GRN" wire terminal of A/C condenser fan control relay.
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Is voltage 10 - 14 V? 		 Go to Step 5. Go to Step 3.
3  Check wire circuit 
  1. Disconnect A/C compressor control relay (1) from relay / fuse box with ignition switch turned OFF.
  2. Turn ON ignition switch, measure voltage between engine ground and "LT GRN" wire terminal of A/C condenser fan control relay connector.
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Is voltage 10 - 14 V? 		 Faulty A/C compressor control relay. Go to Step 4.
4  Check wire circuit 
  1. Remove "HEATER" fuse (10 A) from circuit fuse box with ignition switch turned OFF.
  2. Measure resistance between "LT GRN" wire terminal of "HEATER" fuse (10 A) connector and vehicle body ground.

Is resistance infinity? 		 Open wire in "LT GRN" circuit.
If OK, go to Step 5.		 "LT GRN" wire shorted to ground circuit.
5  Check wire circuit 
  1. Connect A/C condenser fan control relay to relay / fuse box with ignition switch turned OFF.
  2. Disconnect connectors from ECM.
  3. Turn ON ignition switch, measure voltage between vehicle body ground and "C45-1" wire terminal of ECM connector.

Is voltage 10 - 14 V? 		 Go to Step 9. Go to Step 6.
6  Check wire circuit 
  1. Disconnect A/C condenser fan control relay from relay / fuse box with ignition switch turned OFF.
  2. Measure resistance between "C45-1" wire terminal of ECM connector and vehicle body ground.

Is resistance infinity? 		 Go to Step 7. "BLU/YEL" wire shorted to ground circuit.
7  Check wire circuit 
  1. Turn ON ignition switch.
  2. Check voltage between "C45-1" wire terminal of ECM connector and vehicle body ground.

Is voltage 0 V? 		 Go to Step 8. "BLU/YEL" wire shorted to power supply circuit.
8  Check A/C condenser fan control relay 
  1. Check A/C condenser fan control relay referring to COMPRESSOR RELAY AND CONDENSER COOLING FAN RELAY INSPECTION: MANUAL TYPE .

Is result in good condition? 		 Open wire in "BLU/YEL" circuit. Replace relay.
9  Check A/C condenser fan control 
  1. Ignition switch turned OFF.
  2. Remove ECM from vehicle body referring to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION and connect connectors to ECM.
  3. Run engine and turn ON A/C and blower fan switch.
  4. Measure voltage between vehicle body ground and "C45-1" wire terminal of ECM connector.

Is voltage lower 1.5 V? 		 Intermittent trouble. Check for intermittent refer to INTERMITTENT AND POOR CONNECTION INSPECTION . If OK, substitute a knowngood ECM and recheck. Faulty ECM.
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