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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 MAF and IAT sensor and its circuit 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Turn ignition switch to ON position.
  3. Check intake air temp. displayed on scan tool.

Is -40°C (-40°F) or 184°C (363°F) indicated? 		 Go to Step 3. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3  Check wire harness 
  1. Disconnect MAF and IAT sensor connector (1) with ignition switch turned OFF.
  2. Check for proper connection to MAF and IAT sensor connector (1) at "LT GRN/BLK" and "ORN" wire terminals.
  3. If OK, then with ignition switch turned ON.
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Is voltage applied to "LT GRN/BLK" wire terminal about 4 - 6 V? 		 Go to Step 7. Go to Step 4.
4  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 "C46-21" terminal.
  4. If OK, then turn ON ignition switch, check voltage between "C46-21" terminal of ECM connector and vehicle body ground.

Is voltage about 4 - 6 V at each terminal? 		 Open wire in "LT GRN/BLK" circuit.
If wire and connection are OK, go to Step 5.		 Go to Step 5.
5  Check wire circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Measure resistance between "LT GRN/BLK" wire terminal of MAF and IAT sensor connector and vehicle body ground.

Is resistance infinity? 		 Go to Step 6. "LT GRN/BLK" wire shorted to ground or other circuits. If wire are OK, substitute a known-good ECM and recheck.
6  Check wire circuit 
  1. Turn ignition switch to ON position.
  2. Check voltage between "LT GRN/BLK" wire terminal of MAF and IAT sensor connector and body ground.

Is voltage about 0 V? 		 Go to Step 7. "LT GRN/BLK" wire shorted to other circuits. If wire are OK, substitute a known-good ECM and recheck.
7  Check wire circuit 
  1. Measure resistance between "C46-21" terminal of ECM connector and "LT GRN/BLK" wire terminal of MAF and IAT sensor connector with ignition switch turned OFF.

Is resistance below 5 ohm? 		 Go to Step 8. Open or high resistance wire in "LT GRN/BLK" circuit.
8  Check ground circuit 
  1. Connect connectors to ECM.
  2. Check for proper connection of MAF and IAT sensor connector at "ORN" wire terminal.
  3. Measure resistance between "ORN" wire terminal of MAF and IAT sensor connector and vehicle body ground.

Is resistance below 10 ohm? 		 Go to Step 10. Go to Step 9.
9  Check ground circuit 
  1. Measure resistance between "C46-16" terminal of ECM connector and vehicle 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.
10  Check MAF and IAT sensor 
  1. Check MAF and IAT sensor according to Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection  .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace MAF and IAT sensor.
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