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Fast Idle
DETECTION CONDITION AND POSSIBLE CAUSE
| 5 |
FAST IDLE |
| DESCRIPTION |
- Engine speed continues at fast idle after engine warm-up
|
FAST IDLE INSPECTION
| STEP |
INSPECTION |
ACTION |
| 1 |
VERIFY ENGINE OPERATES AT NORMAL OPERATING TEMPERATURE
NOTE:
If vehicle runs normally after the ignition key is turned off, check for damaged ignition switch, IGN RUN circuit short to power, VPWR circuit short to power, etc.
- The ECT PID at normal operating temperature should read between.35 volt (112°C/232°F) and.75 volt (82°C/180°F).
- Does engine appear to be either overheating or not reaching normal operating temperature?
|
Yes |
See
ENGINE COOLING SYMPTOM CHART
. |
| No |
Go to step 2. |
| 2 |
PRELIMINARY CHECKS
- Perform the following preliminary checks:
- Vacuum leaks.
- Throttle plate and linkage.
- Cruise control linkage binding/sticking.
- Intake air tube (leaks).
- Proper sealing of intake manifold and components attached to intake air (such as the EGR valve or IAC valve).
- Are all checks OK?
|
Yes |
Go to step 3. |
| No |
Service as necessary. Verify symptom no longer exists. |
| 3 |
PERFORM PCM QUICK TEST
- Are any DTCs displayed during Continuous Memory, Key ON, Engine OFF (KOEO) or Key ON, Engine Running (KOER) Self Tests?
|
Yes |
Check for cause.
See
DIAGNOSTIC TROUBLE CODE NUMBERS
. |
| No |
Go to step 4. |
| 4 |
CHECK FOR BASE ENGINE AIR LEAKS
|
Yes |
Service as required. |
| No |
Go to step 5. |
| 5 |
- Verify test results. If OK,
See
DIAGNOSTIC INDEX
to service any additional symptoms |