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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 MAP sensor power supply voltage 
  1. Disconnect connector from MAP sensor with ignition switch tuned OFF.
  2. Check for proper connection of MAP sensor connector at "GRY/RED", "ORN" and "LT GRN/RED" wire terminals.
  3. Turn ON ignition switch, measure voltage between engine ground and "GRY/RED" wire terminal of MAP sensor connector.
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Is voltage 4 - 5 V? 		 Go to Step 4. Go to Step 3.
3  Check MAP sensor power supply voltage 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Remove ECM from vehicle body and then connect connectors to ECM.
  3. Turn ON ignition switch, measure voltage between vehicle body ground and "C46-23" terminal of ECM connector.

Is voltage 4 - 5 V? 		 Open wire in "GRY/RED" circuit "GRY/RED" wire shorted to other circuits.
If wires are OK, substitute a known-good ECM and recheck.
4  Check MAP sensor ground circuit 
  1. Measure resistance between "ORN" wire terminal of MAP sensor connector and engine ground.

Is resistance below 5 ohm? 		 Go to Step 6. Go to Step 5.
5  Check ground circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Remove ECM from vehicle body and connect connectors to ECM.
  3. 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. Open or high resistance wire in "C45-6" and/or "C46-6" circuit.
If wires are OK, substitute a known-good ECM and recheck.
6  Check MAP sensor signal circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Turn ignition switch to ON position.
  3. Measure voltage between "LT GRN/RED" wire terminal of MAP sensor connector and engine ground.

Is voltage 0 V? 		 Go to Step 7. "LT GRN/RED" wire shorted to power supply or other circuits.
7  Check MAP sensor output signal 
  1. Check MAP sensor according to Manifold Absolute Pressure (MAP) Sensor Inspection  .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Faulty MAP sensor.
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