Hello all
Have the above vehicle with high Engine idle approx 3000rpm
No faults codes stored
Done all the usual checks e.g.
Plugs, air leaks, clean throttle housing, valve timing with no improvement.

Car has been to main dealer and have said the alternator duty cycle is constantly at 99.2% causing engine ECU to raise revs to compensate

Have the vehicle back but unfortunately Autodiagnos doesn't list Alternator duty cycle just ECU Voltage at 14.3v

Have tried swapping battery with no difference

if you remove the 2 pin multi plug on the alternator the Normal Idle speed is resumed

Have checked for feeds to 2 pin connector unplugged with Ign on engine off
both pins had 12v

When plugged in
PIN 1 (1.2 volts)
PIN 2 (0 volts)

Engine Running
PIN 1 (14.3 volts)
PIN 2 (0 volts)

Question is what should this be?
Is this model known for alternator faults causing this?

Have included the live data
1st is Connector plugged in
2nd is Unplugged running idle closed loop

Thanks
Terry


Engine: Monitor list (56 values saved)

Description Value
Computer Supply Voltage 14.37V
Computer + After Ignition Present
Water Pump Command Inactive
Vehicle Speed 0km/h
Brake Pedal Inactive
Clutch Pedal Inactive
Water Temperature 83°C
Actuator Relay Control Active
Starting Prohibited
Code Programmed Yes
Engine Immobliser Inactive
Air Conditioning Presence No
Compressor Operation Requ Inactive
Air Con Authorisation No
Refrigerant Pressure 0.0bar
Engine Speed 1841rpm
Accelerated Idle Request Absent
Power Absorbed By The AC Compressor 11.8W
Fan Control 1 Not Done
Fan Control 2 Off
Number of Passenger Compartment No
Heating Resistors Fixed (Set By A/C)
Rch Cut Out No
Atmospheric Pressure 1025mbar
Inlet Pressure 407mbar
Boost Pressure 103mbar
Turbo Solenoid Valve OCR Setting 1%
Air Tempurature 29°C
Camshaft Phase Shifter In Defect Mode No
Camshaft Offset Status1
Camshaft Offset Control Inactive
Camshaft Dephaser Measured Position 0d°
Camshaft Dephase OCR Sett 0%
Idle Speed Correction 0rpm
Idle Control Inactive
Idle Regulation Reference 752rpm
Idle Regulation Programming Value 42090675.2%
Idle Regulation Integral Correction 53.8%
Theoretical Idle Regulation RCO 45.6%
Richness Loop Through Upstream Sensor Open
Richness Correction 51.7%
Richness Auto Adaptive Offset 128
Richness Auto Adaptive Gain 128
Injection Duration 3.61ms
Instantaneous Fuel Consumption 0.1l/h
Fuel Pump Command Circuit Active
LPG Faulty No
LPG Ready No
LPG Tank Empty No
Operating In LPG Mode No
Operating In Petrol Mode Yes
Transition From Petrol Mode To LPG Not Done
Transition From LPG Mode To Petrol Not Done
LPG Mode Switching Conditions Incorrect
Motorised Throttle In Downgraded Mode No
Programming Throttle Limits Done
Motorised Throttle Position Closed


Engine: Monitor list (56 values saved)

Description Value
Computer Supply Voltage 14.34V
Computer + After Ignition Present
Water Pump Command Inactive
Vehicle Speed 0km/h
Brake Pedal Inactive
Clutch Pedal Inactive
Water Temperature 86°C
Actuator Relay Control Active
Starting Prohibited
Code Programmed Yes
Engine Immobliser Inactive
Air Conditioning Presence No
Compressor Operation Requ Inactive
Air Con Authorisation No
Refrigerant Pressure 0.0bar
Engine Speed 730rpm
Accelerated Idle Request Absent
Power Absorbed By The AC Compressor 11.8W
Fan Control 1 Not Done
Fan Control 2 Off
Number of Passenger Compartment No
Heating Resistors Fixed (Set By A/C)
Rch Cut Out No
Atmospheric Pressure 1025mbar
Inlet Pressure 407mbar
Boost Pressure 103mbar
Turbo Solenoid Valve OCR Setting 1%
Air Tempurature 30°C
Camshaft Phase Shifter In Defect Mode No
Camshaft Offset Status1
Camshaft Offset Control Inactive
Camshaft Dephaser Measured Position 0d°
Camshaft Dephase OCR Sett 0%
Idle Speed Correction 0rpm
Idle Control Active
Idle Regulation Reference 752rpm
Idle Regulation Programming Value 42090675.2%
Idle Regulation Integral Correction 38.4%
Theoretical Idle Regulation RCO 6.4%
Richness Loop Through Upstream Sensor Open
Richness Correction 30.0%
Richness Auto Adaptive Offset 128
Richness Auto Adaptive Gain 128
Injection Duration 3.17ms
Instantaneous Fuel Consumption 0.0l/h
Fuel Pump Command Circuit Active
LPG Faulty No
LPG Ready No
LPG Tank Empty No
Operating In LPG Mode No
Operating In Petrol Mode Yes
Transition From Petrol Mode To LPG Not Done
Transition From LPG Mode To Petrol Not Done
LPG Mode Switching Conditions Incorrect
Motorised Throttle In Downgraded Mode No
Programming Throttle Limits Done
Motorised Throttle Position Closed