Mazda 3 - 4 Hard to Start;Long Crank;Erratic Start;Erratic Crank [Lf]

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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550
• Open circuit in wiring harness
between ignition switch and starter
12
Retrieve any KOEO DTCs using WDS or
equivalent.
Are there DTCs displayed during KOEO
inspection?
Yes
DTC is displayed:
Go to the appropriate DTC
inspection.
(See DTC TABLE [LF].)
No
No DTC is displayed:
Inspect the following:
• START circuit in ignition switch
• Open circuit in wiring harness
between ignition switch and starter
13
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [LF].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See PCM REMOVAL/INSTALLATION [LF].)
NO.4 HARD TO START/LONG CRANK/ERRATIC
START/ERRATIC CRANK [LF]
B3E010318881W06
4
HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK
DESCRIPTION
• The starter cranks engine at normal speed but engine requires excessive cranking
time before starting.
• The battery is in normal condition.
POSSIBLE
CAUSE
• Erratic signal to ignition coil
• Vacuum leakage
• Poor fuel quality
• Starting system malfunction
• Spark plug malfunction
• Air leakage from intake-air system
• Erratic signal from CKP sensor