Dtc P0172 Fuel Trim System Too Rich - Daewoo MATIZ Service Manual

1F – 110 ENGINE CONTROLS
Step
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
1
Is the system check complete?
Install the scan tool to the Data Link Connector
(DLC).
2 Turn the ignition ON.
Are any component related Diagnostic Trouble
Codes (DTCs) set?
1. With the engine running, operate the vehicle until
the LOOP STATUS indicates closed.
3
Is the Long Term Fuel Trim value above the
specified value?
1. Turn the ignition switch ON, with the engine OFF.
2. Review the Freeze Frame data and note the
parameters.
3. Operate the vehicle within the Freeze Frame
4
conditions and Conditions for Setting The DTC as
noted.
Does the Long Term Fuel Trim value above the
specified value while operating under the specified
conditions?
Visually/physically check the air cleaner filter for
excessive dirt or being plugged and repair as
5
needed.
Is the repair complete?
Visually/physically check the air intake system for
collapsed or restricted and repair as needed.
6
Is the repair complete?
Inspect the throttle body inlet for damaged or foreign
objects which may partially block the airflow and
7
repair as needed.
Is the repair complete?
1. Turn the ignition OFF.
2. Inspect the throttle bore, throttle plate and Idle Air
8 Control (IAC) passages for clocking and foreign
objects and repair as needed.
Is the repair complete?
Start the engine with the vehicle in park or neutral
and A/C off and note the idle quality.
9
Is a low or unsteady idle being experienced?
Idle the engine.
10
Are the IAC counts below the specified value?
1. Turn the ignition OFF.
2. Disconnect the Manifold Absolute Pressure
(MAP) sensor electrical connector.
3. Start the engine.
11
4. Operate the vehicle in Closed Loop while
monitoring the Long Term Fuel Trim value.
Does the Long Term Fuel Trim value increase above
the specified value?
DTC P0172 – Fuel Trim System Too Rich
Action Value(s) Yes
–
Go to Step 2
–
Go to
Applicable DTC
table
30% Go to Step 4
30% Go to Step 21
–
Go to Step 21
–
Go to Step 21
–
Go to Step 21
–
Go to Step 21
–
Go to Step 10
100 Go to Step 12
30% Go to Step 20
No
Go to
"On-Board
Diagnostic
System Check"
Go to Step 3
Go to Step 5
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 8
Go to Step 9
Go to Step 12
Go to Step 11
Go to Step 12
DAEWOO M-150 BL2