Section 02 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Defective encoder/trigger wheel
Check, refer to ENGINE MANAGEMENT
Incorrectly aligned flywheel and trigger
wheel
Properly position flywheel and trigger
wheel, refer to the
1503 4-TEC ENGINE
SHOP MANUAL
Insufficient engine compression Replace defective part(s)
Engine turns over (cont'd)
Idle bypass valve stuck or not
functioning
Check, refer to ENGINE MANAGEMENT
Spark plug faulty, fouled or worn out Check spark plug condition
Ignition
Check, refer to ELECTRICAL SYSTEM
No spark at spark plugs
Faulty ECM Replace ECM
ENGINE HARD TO START
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Defective idle bypass valve
Refer to ENGINE MANAGEMENT
Wrong TPS zero setting Refer to ENGINE MANAGEMENT
Throttle cable adjustment
Refer to ENGINE MANAGEMENT
Temperature too low for available
battery capacity
Battery capacity is not sufficient for cold
temperature
Air lock in fuel rail
Refer to ENGINE MANAGEMENT
Water in intake system (defective MAP
sensor)
Check and remove water. Refer to
SPECIAL PROCEDURES subsection
Water in fuel reservoir or contaminated
fuel
Flush reservoir and refill with fresh gas
Check cylinder compression
Check for cylinder head leaks
Mechanical engine failure
Check starting system
Spark plug faulty, fouled or worn out Check spark plug condition
Check fuel pump operation. Refer to
FUEL TANK AND FUEL PUMP
Low fuel pressure
Check fuel pressure regulator. Refer to
FUEL TANK AND FUEL PUMP
Defective CAPS Check CAPS and its circuit. Refer to
ENGINE MANAGEMENT
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