P1603 – Engine Stall History (Toyota)

Description

The ECM recorded repeated engine stall events indicating unstable combustion or insufficient starting performance.

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Symptoms

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

Causes

Weak battery
Failing fuel pump
Vacuum leaks
Dirty throttle body
Ignition coil issues

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