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Diagnostic Trouble Codes Troubleshooting

DTC TROUBLESHOOTING

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 HO2S-1 heater power circuit 
  1. Disconnect connector from HO2S-1 with ignition switch turned OFF.
  2. Check for proper connection to HO2S-1 connector at "BLK/WHT" and "PNK/BLK" wire terminals.
  3. If wire and connection are OK, measure voltage between "BLK/WHT" wire terminal of HO2S-1 connector and engine ground with ignition switch turned ON.

Is voltage over 10 V? 		 Go to Step 3. Open wire in "BLK/ WHT" circuit or "BLK/ WHT" circuit shorted to ground.
3 Check HO2S-1 heater power circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Measure resistance between "BLK/WHT" wire terminal of HO2S-1 connector and "C46-10" terminal of ECM connector.

Is resistance below 5 Ω? 		 Go to Step 4. High resistance wire in "BLK/WHT" circuit.
4 Check HO2S-1 heater drive circuit 
  1. Measure resistance between "PNK/BLK" wire terminal of HO2S-1 connector and vehicle body ground.

Is resistance infinity? 		 Go to Step 5. "PNK/BLK" circuit shorted to ground.
5 Check HO2S-1 heater drive circuit 
  1. Turn ON ignition switch.
  2. Measure voltage between "PNK/BLK" wire terminal of HO2S-1 connector and vehicle body ground.

Is voltage 0 V? 		 Go to Step 6. "PNK/BLK" circuit shorted to power supply line.
6 Check HO2S-1 heater drive circuit 
  1. Connect connector to HO2S-1 with ignition switch turned OFF.
  2. Turn ON ignition switch.
  3. Measure voltage between "C46-7" terminal and vehicle body ground with disconnect connector from ECM.

Is voltage over 10 V? 		 Go to Step 7. Open wire in "PNK/BLK" circuit.
7 Check heater of sensor-1 
  1. Check HO2S-1 heater resistance referring to HEATED OXYGEN SENSOR (SENSOR-1 AND SENSOR-2) INSPECTION .

Is resistance within specified value? 		 Go to Step 8. Replace HO2S-1.
8 Check HO2S-1 heater power circuit 
  1. Connect connector to HO2S-1 with ignition switch turned OFF.
  2. Measure resistance between "C46-7" and "C46-10" terminals of ECM connector.

It resistance below 10 Ω? 		 HO2S-1 heater circuit are OK.
Substitute a known-good ECM and recheck.		 High resistance wire in "PNK/BLK" circuit.
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