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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 main fuse 
  1. Check for main fuse (30 A) (1) in relay / fuse box with ignition switch turned OFF.
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Is main fuse (30 A) in good condition? 		 Go to Step 3. Check for short in circuits connected to this fuse.
3  Check wire circuit 
  1. Disconnect radiator fan control relay No. 1 (1) from relay box (2) with ignition switch turned OFF.
  2. Turn ON ignition switch, measure voltage between each engine ground to "BLK/WHT" and "BLU/WHT" wire terminal.
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Is voltage 10 - 14 V? 		 Go to Step 4. Open wire in "BLK/WHT" and/or "BLU/WHT" circuit.
4  Check wire circuit 
  1. Connect radiator fan control relay No. 1 to relay box with 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. Turn ON ignition switch, measure voltage between vehicle body ground and "G04-3" wire terminal of ECM connector when engine coolant temp. is below 97°C, 207°F.

Is voltage 10 - 14 V? 		 Go to Step 8. Go to Step 5.
5  Check wire circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Disconnect radiator fan control relay No. 1 from relay box.
  3. Measure resistance between "G04-3" wire terminal of ECM connector and vehicle ground.

Is resistance infinity? 		 Go to Step 6. "BRN" wire shorted to ground circuit.
6  Check wire circuit 
  1. Turn ON ignition switch.
  2. Check voltage between "G04-3" wire terminal of ECM connector and vehicle body ground.

Is voltage 0 V? 		 Go to Step 7. "BRN" wire shorted to power supply circuit.
7  Check radiator fan control relay No. 1 
  1. Check radiator fan control relay No. 1, referring to RADIATOR FAN CONTROL SYSTEM CHECK .

Is result in good condition? 		 Open wire in "BRN" circuit. Replace relay.
8  Check radiator fan control No. 1 
  1. Run engine at ECT is over 97°C, 207°F.
  2. Measure voltage between vehicle body ground and "G04-3" wire terminal of ECM connector.

Is voltage lower 1.5 V? 		 Go to Step 9. Faulty ECM.
Substitute a known-good ECM and recheck.
9  Check radiator fan control 
  1. Disconnect radiator fan control relay No. 2 (2), and No. 3 (3) from relay box (1) with ignition switch turned OFF.
  2. Run engine at ECT is over 97°C, 207°F.
  3. Measure voltage between vehicle body ground and each "BLU/RED" wire terminal of radiator fan control relay No. 2 and No. 3 connectors.
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Is voltage 10 - 14 V? 		 Go to Step 10. Open wire in "BLU/RED" circuit.
10  Check wire circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Connect radiator fan control relay No. 2 to relay box.
  3. Using service wire, connect "G04-3" wire terminal of ECM connector and vehicle body.
  4. Turn ON ignition switch, measure voltage between vehicle body ground and "G04-4" wire terminal of ECM connector.

Is voltage 10 - 14 V? 		 Go to Step 11. Go to Step 12.
11 
  1. Disconnect radiator fan control relay No. 2 and then connect radiator fan control relay No. 3 to relay box with ignition switch turned OFF.
  2. Turn ON ignition switch, measure voltage between vehicle body ground and "G04-4" wire terminal of ECM connector.

Is voltage 10 - 14 V? 		 Go to Step 15. Go to Step 12.
12  Check wire circuit 
  1. Disconnect radiator fan control relay No. 2 and No. 3 from relay box with ignition switch turned OFF.
  2. Measure resistance between "G04-4" wire terminal of ECM connector and vehicle body ground.

Is resistance infinity? 		 Go to Step 13. "GRN/RED" wire shorted to ground circuit.
13  Check wire circuit 
  1. Turn ON ignition switch.
  2. Check voltage between "G04-4" wire terminal of ECM connector and vehicle body ground.

Is voltage 0 V? 		 Go to Step 14. "GRN/RED" wire shorted to power supply circuit.
14  Check radiator fan control relay No. 2 and No. 3 
  1. Check radiator fan control relay No. 2 and No. 3, referring to RADIATOR FAN CONTROL SYSTEM CHECK .

Are relays in good condition? 		 Open wire in "GRN/RED" circuit. Replace relay.
15  Check radiator fan control No. 2 and No. 3 
  1. Connect connectors to ECM with ignition switch turned OFF.
  2. Connect radiator fan control relay No. 2 to relay box.
  3. Run engine at ECT is over 102°C, 216°F.
  4. Measure voltage between vehicle body ground and "G04-4" wire terminal of ECM connector.

Is voltage lower than 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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