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Home >> Jaguar >> 2004 >> XJ (X350) V8-4.2L SC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Monitors, Trips, Drive Cycles and Readiness Codes >> Idle Speed Control Monitor
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Idle Speed Control Monitor



Idle Speed Control
If all the entry conditions are satisfied, then the monitor will start execution.

If the Target Engine Speed - Engine Speed >= 100 rpm then a counter is started and once this exceeds the failure time limit a failure judgment is made for ISC higher than expected.

If the Target Engine Speed - Engine Speed >= -200 rpm then a counter is started

And once this exceeds the failure time limit a failure judgment is made for ISC higher than expected.






Stable condition: The idle speed system is deemed unstable for a period of 1s, following a change in state of any of the following parameters:
- Park/neutral switch
- Heated screen
- A/C clutch
- Cooling fan fast mode
- Cooling fan slow mode
- Headlamp
- Main beam
- Side lamp
- Footbrake
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