Step 7: Confirm All SRTs "COMPLETE"
If all SRT items indicate "COMPLETE," the inspection is complete.
| ^ |
If Catalyst and/or O2 Sensor Monitors show "INCOMPLETE" perform step A or B below.
|
| A. |
Check Self Learning Value (Long Term Fuel Trim (LTFT)) and A/F ALPHA (Short Term Fuel Trim (STFT)). If either value is +10% or more above target of 100%, clear Self Learning Value.
| ^ |
Perform DTC diagnosis for P0171 or P0174 and check for the following possible causes:
| > |
Intake air leaks
|
| > |
Front heated oxygen sensors
|
| > |
Injectors
|
| > |
Exhaust gas leaks
|
| > |
Incorrect fuel pressure
|
| > |
Lack of fuel
|
| > |
Mass air flow sensor
|
|
|
| B. |
Check Self Learning Value (Long Term Fuel Trim (LTFT)) and A/F ALPHA (Short Term Fuel Trim (STFT)). If either value is -10% or more below target of 100%, clear Self Learning Value.
| ^ |
Perform DTC diagnosis for P0172 or P0175 and check for the following possible causes:
| > |
Intake air leaks
|
| > |
Front heated oxygen sensors
|
| > |
Injectors
|
| > |
Exhaust gas leaks
|
| > |
Incorrect fuel pressure
|
| > |
Lack of fuel
|
| > |
Mass air flow sensor
|
|
|
| ^ |
After repairs have been made, run the prescribed drive pattern and check that A/F ALPHA is within +/-10% of the target of 100% during the steady state portions of the drive cycle. If it is not, then continue repairs. If it is, return to STEP 5.
|
|
