TROUBLESHOOTING GUIDE — 6 CRANKS NORMALLY BUT HARD TO START — WHEN ENGINE COLD
F2-29flowchart6 CRANKS NORMALLY BUT HARD TO START — WHEN ENGINE COLD
DESCRIPTION: Engine cranks at normal speed but requires excessive cranking time before starting. Battery in normal condition. Restarts OK after warm-up. Engine runs normally at idle (If idle condition is not OK, refer to "Rough idle" [Nos. 8-12]).
NOTE
[TROUBLESHOOTING HINTS] (1) Air/Fuel mixture too rich — Volume air flow sensor stuck; Air cleaner element clogged; Idle air control malfunction. (2) Air/Fuel mixture too lean — Fuel injection control malfunction (correction for coolant temperature). (3) Poor atomization.
CRANKS NORMALLY BUT HARD TO START — WHEN ENGINE COLD (steps 1-6)
1
STEP 1: Is "00" displayed on Self-Diagnosis Checker ignition switch ON? (page F2-73). Self-Diagnosis Checker / System Selector.
No
Diagnostic trouble code No. displayed. Check for cause (Refer to specified check sequence) (page F2-74)
Yes — Go to next step
2
STEP 2: Are ECM terminal voltages OK? 1C-Starter signal; 2E-Engine coolant temperature sensor; 3D-Sensor ground (page F2-141)
No
Check for cause (page F2-141)
Yes — Go to next step
3
STEP 3: Does engine start easily when throttle valve is quarterly open?
Yes
Is idle air control valve OK? (page F2-99). If it is, check air valve (page F2-99). If it is not, replace idle air control valve (page F2-95)
No — Go to next step
4
STEP 4: Is intake manifold vacuum correct at idle? Vacuum: More than 450 mmHg {17.7 inHg}
No
Check for air leakage of intake-air system components
Yes — Go to next step
5
STEP 5: Is air cleaner element clean? (page F2-70)
No
Replace air cleaner element
Yes — Go to next step
6
STEP 6: Disconnect idle air control valve connector at idle. Does engine speed increase? (page F2-99)
No
7
Replace idle air control valve (page F2-99)