STEP 1. Check harness connector C-45 at linear air-fuel ratio sensor for damage.
STEP 2. Check the linear air-fuel ratio sensor.
(1) Disconnect the linear air-fuel ratio sensor connector C-45.
(2) Measure the resistance between linear air-fuel ratio sensor connector terminal No. 2 and terminal No. 3.Standard value: 2.3 - 4.2 ohms [at 20°C (68°F)]
Is the measured resistance between 2.3 and 4.2 ohms [at 20°C (68°F)]?
Go to Step 3. Replace the linear air-fuel ratio sensor. Then go to Step 8.
STEP 3. Check harness connector A-37X at the MFI relay for damage.
STEP 4. Check for harness damage between MFI relay connector A-37X (terminal No. 2) and linear air-fuel ratio sensor connector C-45 (terminal No. 3).
STEP 5. Check harness connector B-26 at ECM for damage.
STEP 6. Check for harness damage between linear air-fuel ratio sensor connector C-45 (terminal No. 2) and ECM connector B-26 (terminal No. 34).
STEP 7. Check the trouble symptoms.
STEP 8. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 . (2) Check the diagnostic trouble code (DTC).
Is DTC P0053 set?
Retry the troubleshooting. The inspection is complete.