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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 Does fuel level meter indicate "E" level (empty)?  Add fuel and recheck. Go to Step 4.
3 HO2S-1 output voltage check 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Warm up engine to normal operating temperature and keep it at 2000 r/min. for 60 sec.
  3. Repeat racing engine (Repeat depressing accelerator pedal 5 to 6 times continuously to enrich A/F mixture and take foot off from pedal to enlean) and check HO2S output voltage displayed on scan tool.

Is over 0.6 V and below 0.4 V indicated? 		 Go to Step 5. Go to Step 4.
4 Check HO2S-1 sensor ground 
  1. Disconnect connector from HO2S-1 with ignition switch turned OFF.
  2. Check for proper connection to HO2S-1 connector at "WHT", "ORN", "PNK/BLK" and "BLK/WHT" wire terminals.
  3. If wire and connection are OK, check there is continuity between "ORN" wire terminal of HO2S-1 sensor connector and engine ground.

Is it continuity? 		 Go to Step 5. Open wire in "ORN" circuit.
Poor "C46-16" terminal connection.
Open or high resistance wire in "C45-6" and/or "C46-6" circuit.
If they are OK, substitute a known-good ECM and recheck.
5 Check HO2S-1 sensor ground 
  1. With ignition switch turn ON, check voltage between "ORN" wire terminal of HO2S-1 sensor connector and engine ground.

Is voltage about 0.1 V or less? 		 Go to Step 6. High resistance wire in "ORN" circuit.
Poor "C46-27" terminal connection.
Open or high resistance wire in "C45-6" and/or "C46-6" circuit.
If they are OK, substitute a known-good ECM and recheck.
6 Check wire 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 "WHT" wire terminal of HO2S-1 connector and "C46-28" terminal of ECM connector.

Is resistance less than 5 Ω? 		 Go to Step 7. High resistance or open wire in "WHT" circuit.
Poor "C46-28" terminal connection.
Open or high resistance wire in "C45-6" and/or "C46-6" circuit.
If they are OK, substitute a known-good ECM and recheck.
7 Check wire circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Measure resistance between "WHT" wire terminal of HO2S-1 connector and body ground.

Is resistance infinity? 		 Go to Step 8. "WHT" wire shorted to ground circuit.
8 Check HO2S-1 heater circuit 
  1. Check HO2S-1 heater circuit, referring to "DTC P0135: 02 SENSOR HEATER CIRCUIT (SENSOR-1) :".

Is result in good condition? 		 Go to Step 9. Repair or replace it.
9 Check exhaust system 
  1. Check exhaust system for exhaust gas leakage.

Is it OK? 		 Go to Step 4 in "DTC P0171 /P0172: System Too Lean / Rich:".
If it is in good condition, Go to Step 10.		 Repair exhaust system for leakage.
10 Check throttle body 
  1. Check throttle body for clog or leak.

Is it OK? 		 Check HO2S-1 referring to HEATED OXYGEN SENSOR (SENSOR-1 AND SENSOR-2) INSPECTION .
If it in good condition, substitute a known-good ECM and recheck.		 Repair throttle body.
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