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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  Engine coolant temp. check 
  1. With ignition switch turned OFF, install scan tool to DLC.
  2. Turn ON ignition switch and check engine coolant temp. displayed on scan tool.
  3. Warm up engine to normal operating temp. and check engine coolant temp. displayed on scan tool.

Does engine coolant temp. vary higher than 1° C (1°F) and rise higher than 70°C (158°F)? 		 Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION . Go to Step 3.
3  Thermostat check 
Is there a symptom due to thermostat remaining open (it takes a long time before vehicle heater becomes effective or before engine is warmed to normal operating temp., etc.)? 		 Check thermostat referring to THERMOSTAT INSPECTION . Go to Step 4.
4  Check wire harness 
  1. Disconnect ECT sensor connector with ignition switch turned OFF.
  2. Check for proper connection to ECT sensor connector at "ORN" and "LT GRN" wire terminals.
  3. If OK, then with ignition switch ON.
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Is voltage applied to "LT GRN" wire terminal about 4 - 6 V? 		 Go to Step 7. Go to Step 5.
5  Check ECM voltage 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Remove ECM from vehicle body and connect connectors to ECM.
  3. Check for proper connection of ECM connector at "C46-12" terminal.
  4. If OK, then turn ON ignition switch, check voltage between "C46-12" terminal of ECM connector and body ground.

Is voltage about 4 - 6 V? 		 Open wire in "LT GRN" circuit.
If wire and connection are OK, go to Step 6.		 Go to Step 6.
6  Check wire circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Measure resistance between "LT GRN" wire terminal of ECT sensor connector and body ground.

Is resistance infinity? 		 Go to Step 7. "LT GRN" wire shorted to ground circuit.
If wire are OK, substitute a known-good ECM and recheck.
7  Check wire circuit 
  1. Turn ignition switch to ON position.
  2. Check voltage between "LT GRN" wire terminal of ECT sensor connector and body ground.

Is voltage about 0 V? 		 Go to Step 8. "LT GRN" wire shorted to power circuit.
If wire are OK, substitute a known-good ECM and recheck.
8  Check wire circuit 
  1. Measure resistance between "C46-12" terminal of ECM connector and "LT GRN" wire terminal of ECT sensor connector with ignition switch turned OFF.

Is resistance below 5 ohm? 		 Go to Step 9. High resistance wire in "LT GRN" circuit.
9  Check ground circuit 
  1. Connect connectors to ECM.
  2. Check for proper connection of ECT sensor connector at "ORN" wire terminal.
  3. Measure resistance between "ORN" wire terminal of ECT sensor connector and body ground.

Is resistance below 10 ohm? 		 Go to Step 11. Go to Step 10.
10  Check ground circuit 
  1. Measure resistance between "C46-16" terminal of ECM connector and body ground.

Is resistance below 5 ohm? 		 Open or high resistance wire in "ORN" circuit.
Poor "C46-16" connection.		 Open or high resistance wire in "C45-6" and/or "C46-6" circuit.
If circuit are OK, substitute a known-good ECM and recheck.
11  Check ECT sensor 
  1. Check ECT sensor according to Engine Coolant Temperature (ECT) Sensor Inspection  .

Is it good condition? 		 Substitute a known-good ECM and recheck. Replace ECT sensor.
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