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.
- 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.
- The engine speed monitored with a 120 degree- cycle pulse is 500 r/min or less.
- 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 |
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Q.
Is diagnosis code set?
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Replace the engine-ECU. |
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Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
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