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

Related Problems

Related Fault Codes