Code No. P1239: Trustful Check Engine Speed


FUNCTION



  • Compares the actual engine speed calculated from the crank angle sensor signal cycle with the estimated engine speed calculated from the number of the crank angle sensor signal pulses after a lapse of the specified time.

TROUBLE JUDGMENT


Check Condition
  • The engine speed monitored with a 120 degree- cycle pulse is 500 r/min or more.
Judgment Criterion
  • The difference between the engine speed monitored with a 120 degree-cycle pulse and the engine speed monitored with a 10 degree-cycle pulse is 500 r/min or more.
Check Condition
  • The engine speed monitored with a 120 degree- cycle pulse is 500 r/min or less.
Judgment Criterion
  • The engine speed monitored with a 10 degree- cycle pulse is 1,000 r/min or more.

PROBABLE CAUSE



  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).