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DTC Troubleshooting

NOTE: Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to PRECAUTIONS FOR DTC TROUBLESHOOTING .
DTC TROUBLESHOOTING CHART

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  Wire harness check 
  1. Turn ignition switch to OFF position.
  2. Check for proper terminal connection to related radiator cooling fan relay (No. 1, No. 2 or No. 3) and ECM connectors.
  3. If connections are OK, recheck DTC.

Is DTC P0480, P0481 or P0482 detected again? 		 Go to Step 3. Intermittent trouble.
3  Radiator cooling fan control circuit voltage check 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors from ECM.
  3. Turn ignition switch ON position.
  4. Check that related radiator cooling fan relay (No. 1, No. 2 or No. 3) control circuit voltage is battery voltage between ECM connector and vehicle body ground.

Is it in good condition? 		 Substitute a known-good ECM and recheck. Go to Step 4.
4  Radiator cooling fan control circuit voltage check 
  1. Turn ignition switch to OFF position.
  2. Remove radiator cooling fan relay No. 1, No. 2 or No. 3.
  3. Turn ignition switch ON position.
  4. Check that related radiator cooling fan relay (No. 1, No. 2 or No. 3) power supply voltage is battery voltage between radiator cooling fan relay (No. 1, No. 2 or No. 3) connector and vehicle body ground.

Is it in good condition? 		 Go to Step 5. Repair or replace power supply circuit of radiator cooling fan relay (No. 1, No. 2 or No. 3).
5  Radiator cooling fan relay check 
  1. Check radiator cooling fan relay No. 1, No. 2 or No. 3 for operation referring to RADIATOR COOLING FAN RELAY INSPECTION .

Is it in good condition? 		 Repair or replace control circuit of radiator cooling fan relay (No. 1, No. 2 or No. 3). If circuit is OK, substitute a known-good ECM and recheck. Replace radiator cooling fan relay No. 1, No. 2 or No. 3.
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