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Home >> Ford >> 2021 >> Mustang Mach 1 Premium, Automatic Trans >> Repair and Diagnosis >> Electrical >> Starter >> Starting System - 5.0L 32V Ti-VCT (359KW/486PS) (WU)/5.0L Ti-VCT V8 (343KW/466PS) (MF) >> Diagnosis And Testing >> Starting System >> Symptom Chart(s)

Symptom Chart(s)

Symptom Chart: Starting System 

Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

Symptom Chart 

Condition Possible Sources Actions
The engine does not crank Refer to the Pinpoint Test GO to Pinpoint Test A 
The engine cranks slowly Refer to the Pinpoint Test PERFORM the starter system component test. REFER to PINPOINT TEST A: ENGINE DOES NOT CRANK .
The engine cranks but will not start Fuses
PCM
Fuel pump
Fuel pump relay
Starter
Wiring, terminals or connectors
Refer to INTRODUCTION .
Unusual starter noise Refer to the Pinpoint Test GO to Pinpoint Test B 
The starter spins but the engine does not crank Starter motor INSPECT the starter motor mounting and engagement. REPAIR as necessary.
Damaged flexplate INSPECT the flexplate for damaged, missing or worn teeth. REPAIR as necessary.
The starter does not disengage from the flexplate Starter relay
Wiring, terminals or connectors
Starter
REMOVE the starter relay. If the engine stops cranking, INSTALL a new relay. If the engine continues to crank, REPAIR circuit CDC25 (BN/GN) for a short to voltage.
The remote start is inoperative Remote start feature not enabled
Passive Key or battery
PCM
Wiring, terminals or connectors
REFER to: Locks, Latches and Entry Systems
The remote start has poor range performance Passive key or battery
After market systems
High power devices
TV/radio transmission towers
REFER to: Locks, Latches and Entry Systems