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DTC Troubleshooting

DIAGNOSTIC PROCEDURES 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  A/F sensor heater power supply circuit check 
  1. Confirm that ignition mode of keyless push start system is "OFF".
  2. Disconnect connector from A/F sensor.
  3. Check for proper terminal connection to A/F sensor.
  4. If connections are OK, push engine switch to change ignition mode to "ON".
  5. Check that "A1" circuit is battery voltage.

Is it in good condition? 		 Go to Step 3. Repair or replace defective parts or wire harness.
3  A/F sensor heater drive circuit check 
  1. Push engine switch to change ignition mode to "OFF".
  2. Disconnect "C01" and "E01" connectors.
  3. Check for proper terminal connection to ECM connectors.
  4. If connections are OK, check the following points.
    • Resistance of "A2" circuit: less than 1 Ω
    • Resistance between "A2" circuit and ground: infinity
    • Resistance between "A2" circuit terminal and each terminal at A/F sensor connector: infinity
    • Voltage of "A2" circuit: 0 - 1 V (with ignition mode of keyless push start system in "ON")

Are they in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4  A/F sensor check 
  1. Check A/F sensor heater, see A/F SENSOR ON-VEHICLE INSPECTION .

Is it in good condition? 		 Replace ECM and recheck DTC, see ECM REMOVAL AND INSTALLATION . Replace A/F sensor, see A/F SENSOR ON-VEHICLE INSPECTION .
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