P1609 – Engine Stall History (Toyota)

Description

The ECM recorded multiple stall events indicating unstable combustion or insufficient idle stability.

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Symptoms

Engine stalls
Rough idle
Hard starting
Long cranking
Check engine light on

Causes

Weak battery
Fuel delivery issues
Vacuum leaks
Dirty throttle body
Ignition coil faults

Diagnosis

Check fuel pressure
Inspect intake system
Test ignition coils
Check battery voltage
Scan for related codes

Repair

Repair vacuum leaks
Replace coils
Clean throttle body
Replace fuel pump