TROUBLESHOOTING GUIDE — CRANKS NORMALLY BUT WILL NOT START (PARTIAL COMBUSTION) — WHEN ENGINE COLD (continued)
F2-24flowchartNOTE
B+: Battery positive voltage
CRANKS NORMALLY BUT WILL NOT START (PARTIAL COMBUSTION) — WHEN ENGINE COLD (steps 4-10, continued from F2-23)
1
STEP 4: Are ECM terminal voltages OK? (page F2-141) — 1C (Start signal)
No
Check for cause (page F2-141)
Yes — Go to next step
2
STEP 5: Is there air leakage of intake-air system components?
Yes
Repair or replace
No — Go to next step
3
STEP 6: Does engine start when engine coolant temperature sensor is disconnected?
Yes
Check engine coolant temperature sensor (page F2-152)
No — Go to next step
4
STEP 7: Does volume air flow sensor move smoothly from fully closed to fully open? (page F2-150)
No
Repair or replace volume air flow sensor
Yes — Go to next step
5
STEP 8: Is engine compression correct? Engine compression (Minimum): 981 kPa {10.0 kgf/cm2, 142 psi}-300 rpm
No
Check engine condition: Worn piston, piston rings, or cylinder wall; Defective cylinder head gasket; Distorted cylinder head; Improper valve seating; Valve stuck in guide
Check engine condition: Worn piston, piston rings, or cylinder wall; Defective cylinder head gasket; Distorted cylinder head; Improper valve seating; Valve stuck in guide
Yes — Go to next step
6
STEP 9: Are spark plugs OK? (section G)
No
Clean or replace spark plug (section G)
Yes — Go to next step
STEP 10: Try a known good ECM and check if condition improves (page F2-141)