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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  MAP sensor and its circuit check 
  1. Connect scan tool to DLC with ignition switch OFF.
  2. Turn ignition switch ON.
  3. Check intake manifold pressure.

Is it 0 kPa or 126 kPa? 		 Go to Step 3. Intermittent trouble. If OK, substitute a known-good ECM and recheck.
3  Wire harness check 
  1. Turn ignition switch OFF position.
  2. Disconnect connectors from MAP sensor and ECM.
  3. Check for proper terminal connection to MAP sensor and ECM connectors.
  4. If connections are OK, check that MAP sensor circuit is as follows.
    • Wiring harness resistance of each MAP sensor power supply, signal and ground circuit is less than 3 Ω.
    • Insulation resistance of each MAP sensor power supply and signal circuit is infinity between MAP sensor connector and vehicle body ground.
    • Insulation resistance of wire harness is infinity between MAP sensor signal terminal and each other terminal at MAP sensor connector.
    • Circuit voltage of each MAP sensor power supply, signal and ground circuit is 0 - 1 V with ignition switch turned ON.

Are they in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4  Wire harness check 
  1. Connect connectors to ECM.
  2. Turn ignition switch to ON position.
  3. Check that MAP sensor power supply voltage is 5 V between power supply terminal and ground terminal of MAP sensor connector.

Is it in good condition? 		 Go to Step 5. Go to Step 6.
5  MAP sensor check 
  1. Check MAP sensor, referring to MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace MAP sensor.
6  Wire harness check 
  1. Turn ignition switch OFF position.
  2. Disconnect connector from A/C refrigerant pressure sensor.
  3. Turn ignition switch to ON position.
  4. Check that MAP sensor power supply voltage is 5 V between power supply terminal and ground terminal of MAP sensor connector.

Is it in good condition? 		 Check A/C refrigerant pressure sensor and its circuit. Substitute a known-good ECM and recheck.
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