DTC Troubleshooting
DTC TROUBLESHOOTING PROCEDURES
| 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 |
Exhaust system visual inspection
- Check exhaust system for leaks, damage and loose.
Is it in good condition?
|
Go to Step 3. |
Repair or replace. |
| 3 |
HO2S circuit check
- Check signal and ground circuits of HO2S for high resistance referring to step 3 of DTC P0137 / P0138: O2 SENSOR CIRCUIT LOW VOLTAGE / HIGH VOLTAGE (SENSOR-2, BANK-1) (EVAP LEAK CHECK MODEL) .
Are they in good condition?
|
Go to Step 4. |
Repair or replace. |
| 4 |
- Replace exhaust manifold (built in warm up three way catalytic converter) and exhaust center pipe (built in three way catalytic converter).
- Perform DTC confirmation procedure.
Is DTC P0420 still detected?
|
Substitute a known-good ECM and recheck. |
End. |