726

Possible Causes

• •Engine speed exceeds 2,250 rpm for 2 or more seconds while engine is running
• •Faulty mechanical operation of the throttle
• •Incorrect calibration/incorrect service part number on ECM
• •Large manifold vacuum leaks
• •Other stored diagnostic trouble codes (DTCs)

Suggested Actions

1. 1Check for other stored DTC codes before using the DTC chart for this code set
2. 2Clear DTC information from the ECM using the Diagnostic Service Tool (DST)
3. 3Correct mechanical operation of the throttle
4. 4Diagnose and repair any existing codes starting with the lowest numerical code first
5. 5Diagnose and repair other stored DTC codes first
6. 6Find and correct the large manifold vacuum leak
7. 7Perform On-Board Diagnostic (OBD) System Check
8. 8Replace ECM with correct service part number

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