Test Description
WARNING: This page is about a different variant/trim than selected.
The number below refers to the step number on the diagnostic table.
- 7:
An EVAP canister that is saturated will cause a rich condition.
DTC P0172 or P0175
| Step |
Action |
Values |
Yes |
No |
| 1 |
Did you perform the Diagnostic System Check - Vehicle? |
- |
Go to Step 2 |
Go to Diagnostic System Check - Vehicle |
| 2 |
Are any DTCs other than DTC P0172 or P0175 also set? |
- |
Go to Diagnostic Trouble Code (DTC) List - Vehicle |
Go to Step 3 |
| 3 |
- Install a scan tool.
- Start and idle the engine at the normal operating temperature in Closed Loop.
- Record the long term fuel trim data.
- Turn OFF the engine.
- Turn ON ignition, with the engine OFF.
- Review the Freeze Frame/Failure Records and record the displayed data for this DTC.
Does the scan tool indicate that the long term fuel trim is less than the specified value? |
-13% |
Go to Step 4 |
Go to Diagnostic Aids |
| 4 |
- Operate engine at idle.
- Observe HO2S parameters with a scan tool.
Does the scan tool indicate that the values are within the specified range and fluctuating? |
200-800 mV |
Go to Step 5 |
Go to Step 6 |
| 5 |
- Turn OFF the engine.
- Visually and physically inspect the following items:
- The evaporative emission (EVAP) lines and components for damage or blockage-Refer to Evaporative Emissions (EVAP) Hose Routing Diagram
.
- The inlet screen of the mass air flow (MAF) sensor for blockage
- The vacuum hoses for splits, kinks, and proper connections-Refer to Emission Hose Routing Diagram
.
- The air intake duct for being collapsed or restricted
- The air filter for being dirty or restricted
- For objects blocking the throttle body
Did you find and correct the condition? |
- |
Go to Step 8 |
Go to Step 7 |
| 6 |
- Turn OFF the engine.
- Inspect the heated oxygen sensor (HO2S) for proper installation.
- Inspect to ensure that the electrical connectors and the wires are secure and not contacting the exhaust system.
- Test for continuity between the signal circuit and the low reference circuit. Refer to the following:
Did you find and correct the condition? |
- |
Go to Step 8 |
Go to Fuel System Diagnosis |
| 7 |
Inspect for the following:
Did you find and correct the condition? |
- |
Go to Step 8 |
Go to Symptoms - Engine Mechanical |
| 8 |
IMPORTANT:
After repairs, use the scan tool Fuel Trim Reset function to reset the Long Term Fuel Trim.
- Turn ON the ignition, with the engine OFF.
- Clear the DTCs with a scan tool.
- Turn OFF the ignition for 30 seconds.
- Start the engine.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition? |
- |
Go to Step 2 |
Go to Step 9 |
| 9 |
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed? |
- |
Go to Diagnostic Trouble Code (DTC) List - Vehicle |
System OK |