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Read Values
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Unit
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Min
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Max.
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Value applies to
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Description
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Use
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Engine RPM
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rpm
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0
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6500
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While crankshaft rotating.
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Crankshaft position sensor frequency converted to rpm.
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Crankshaft position sensor check. The engine speed is approx. 220 rpm while the starter motor is cranking (20 C and good battery).
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Manifold Absolute Pressure
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kPa
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0
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255
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While crankshaft is stationary or rotating.
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Voltage from the sensor is converted to pressure.
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The reading should be approx. 101 kPa with stationary engine at sea level and normal air pressure (1013 mbar). The sensor pressure response can be checked with a pressure-vacuum pump. 0.1 bar corresponds to 10kPa.
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Coolant Temperature
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C
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-40
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127
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While crankshaft is stationary or rotating.
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The voltage across the NTC resistor converted to temperature.
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The value should correspond with the temperature at the sensor.
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Preheating O2S 1
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Processor control of the transistor that grounds the preheating circuit. Shows ON when the transistor is grounding.
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Indicates when it is meaningful to take a reading of the preheating current.
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Preheating O2S 1
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mA
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0
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3000
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While crankshaft is stationary or rotating.
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A voltage reading is taken across a series resistor in the preheating circuit. The current is proportional to the voltage reading.
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A cold sensor can use more than 3000 mA. As the sensor heats up, the current will drop to approx. 1300 mA (engine idling).
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O2S 1
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V
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0
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2
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While crankshaft is stationary or rotating.
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Voltage between reference ground and sensor input.
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When closed loop is active, the value will fluctuate between 0 and 1V, on fuel shut-off 0V and with sensor disconnected approx. 0V.
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Short Term Fuel Trim
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%
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-25
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25
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While crankshaft rotating.
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Closed loop correction of fuel quantity.
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With active purging, closed loop should fluctuate around or close to 0%.
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Multiplicative Adaptation
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%
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-100
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100
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While crankshaft is stationary or rotating.
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Global adaptation correction of the fuel quantity. In T5, the Tech 2 value 100% actually represents 25% counted in injection duration. The adaptation is multiplicative and takes place under partial load to correct percentage differences between the measured air quantity and the injected fuel quantity. The value is adjusted during adaptation so that closed loop fluctuates around 0%.
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Check fuel pressure, pressure response and pump flow capacity if the value deviates greatly from neutral. Check also the pressure sensor and make sure the correct nozzle and control module are fitted.
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Intake Air Temperature
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C
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-40
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123
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While crankshaft is stationary or rotating.
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The voltage across the NTC resistor converted to temperature.
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The value should correspond with the temperature at the sensor.
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Throttle Position Sensor
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%
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0
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100
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While crankshaft is stationary or rotating.
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The sensor is powered with 5V. The voltage rises as the throttle opens. The actual throttle position is shown in % of 5V
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The value should rise from approx. 10% at idling speed to approx. 90% with wide open throttle.
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Knock Sensor
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V
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0
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2.55
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While crankshaft rotating.
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Shows the knock voltage for the current cylinder. Note: the knock sensor function is an internal ignition discharge module function, there are no external sensors.
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This should show 0V when the engine is running and the lead to the ignition discharge module is disconnected. Voltage spikes close to 5V will be shown if briefly connected to B+ (try several times, as the knock window must be located).
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Knock Control
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YES/NO
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0
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1
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While crankshaft rotating.
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Shows YES when the ignition is retarded due to knocking
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Knock control is a normal function of a modern engine. However, this will indicate whether severe knocking is the cause of a weak engine.
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Battery Voltage
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V
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0
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25.5
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While crankshaft is stationary or rotating.
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Shows the voltage on control module pin 60 (+15).
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A drop in voltage in proportion to battery voltage may be caused by a bad ground connection.
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Vehicle Speed (Wire from ABS)
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km/h
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0
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255
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While crankshaft is stationary or rotating.
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Frequency modulated signal from ABS, 29 pulses per wheel revolution. The value from the front right wheel is used.
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Boost pressure control, idle speed control and crankshaft position calculation will not function without correct speed information.
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Injection Duration
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ms
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0
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25
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While crankshaft rotating.
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Final result of fuel calculation.
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Training: To see the connection between current air mass per combustion and injection duration converted to mg petrol / combustion (14.7:1 with closed loop active).
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Engine Load Signal
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s
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0
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512
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While crankshaft rotating.
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Pulse width of load signal available to other systems on pin 35. (Pin not connected on 9-3) The value is proportional to the current air mass per combustion.
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Training: To see the value in proportion to the pressure and consequently the injector opening duration. Value fixed at 26 sec. at idling speed.
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Ignition Timing
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-20
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36
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While crankshaft rotating.
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Crankshaft angle when the trigger lead for the current cylinder is grounded.
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Training: Shows the affect idle speed control, engine speed and load have on the ignition timing.
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Charge Air Control Valve
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%
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0
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100
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While crankshaft is stationary or rotating.
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Shows the degree of opening of the valve. The higher the value, the higher the boost pressure.
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Control module requires basic charging pressure when value is 0%.
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Idle Air Control Valve
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%
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0
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100
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While crankshaft is stationary or rotating.
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Shows the opening degree of the valve. The higher the value, the greater the opening.
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Training: Shows the idle speed control compensation for changes in idle speed load, A/C and DRIVE.
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Gear Position Calculated
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U 1 2 3 4 5 85=Undefined)
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0
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10
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While crankshaft is stationary or rotating.
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Manual gearbox: Gear position is calculated by comparing engine speed and vehicle speed. U will be shown when in neutral or the clutch pedal is depressed.
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Training: Shows how the system calculates the gear position. Used for boost pressure control and Shift-up lamp
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Boost Pressure Demand
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See description.
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0
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6
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While crankshaft is stationary or rotating.
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Current function that is temporarily limiting boost pressure. Note that low gear is not indicated.
0=Boost pressure
1=Knock control 2=Brakes on 3=Pressure sensor malfunction 4=Battery voltage 5=APC valve
6=Low battery voltage
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If boost pressure is lower than expected, you can see here if the control module is requesting a low pressure. If there is nothing limiting the pressure and the correct gear is indicated, the control module has received the correct information and is attempting to control the boost pressure. Look for a fault from pins 2 and 26 and on to the turbocharger.
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Misfire Cyl 1
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0
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4000
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While crankshaft rotating.
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Shows the number of misfires for each cylinder during 1000 crankshaft revolutions multiplied by a load-dependent factor.
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The counter will increase if misfiring occurs and stop when misfiring ceases. The counter is zeroed automatically after 1000 crankshaft revolutions irrespective of whether misfiring has occurred or not. Perform a road test and read the value with a line plotter. A misfiring cylinder is easy to detect.
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Misfire Cyl 2
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0
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4000
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While crankshaft rotating.
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Shows the number of misfires for each cylinder during 1000 crankshaft revolutions multiplied by a load-dependent factor.
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The counter will increase if misfiring occurs and stop when misfiring ceases. The counter is zeroed automatically after 1000 crankshaft revolutions irrespective of whether misfiring has occurred or not. Perform a road test and read the value with a line plotter. A misfiring cylinder is easy to detect.
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Misfire Cyl 3
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0
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4000
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While crankshaft rotating.
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Shows the number of misfires for each cylinder during 1000 crankshaft revolutions multiplied by a load-dependent factor.
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The counter will increase if misfiring occurs and stop when misfiring ceases. The counter is zeroed automatically after 1000 crankshaft revolutions irrespective of whether misfiring has occurred or not. Perform a road test and read the value with a line plotter. A misfiring cylinder is easy to detect.
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Misfire Cyl 4
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0
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4000
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While crankshaft rotating.
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Shows the number of misfires for each cylinder during 1000 crankshaft revolutions multiplied by a load-dependent factor.
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The counter will increase if misfiring occurs and stop when misfiring ceases. The counter is zeroed automatically after 1000 crankshaft revolutions irrespective of whether misfiring has occurred or not. Perform a road test and read the value with a line plotter. A misfiring cylinder is easy to detect.
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Closed Loop
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ON/OFF
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0
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1
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While crankshaft rotating.
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Shows ON when closed loop is active.
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Closed loop active.
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Torque Limitation (Wire from TCM)
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when TCM requests a reduction in engine torque by grounding pin 13.
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Training: Shows the function. Tip: Select D and switch between WINTER On/Off.
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Drive
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when the gear selector in any position other than P or N, whereby B+ is applied to pin 14.
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In case of an open circuit, there will be a large drop in engine speed when shifting from P or N.
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Brake light switch
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when B+ is applied to the control module input, pin 15 (or if there is an open circuit).
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Boost pressure control will not function without correct brake light information.
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Constant
Cruise Control (Wire from CC)
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when cruise control is active, whereby pin 36 will be grounded.
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Training: Shows the functions. The boost pressure can be limited when cruise control is active. The function is not presently implement in the software.
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A/C In (Wire from MIU)
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when A/C is requested by MIU applying B+ to pin 59.
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Shows that the A/C request is reaching the control module.
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A/C Out
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when the relay is activated by the processor grounding pin 54.
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Shows that the A/C compressor solenoid clutch should be active.
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CHECK ENGINE Lamp
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when the lamp is turned on by the processor grounding pin 32.
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Training: Illustrates the function.
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Fuel Pump Relay
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when the relay is activated by the processor grounding pin 56.
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Training: Shows how the system activates the fuel pump when the crankshaft starts to rotate.
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Main Relay
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when the relay is activated by the processor grounding pin 31.
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Training: Shows how the system activates the main relay when the crankshaft starts to rotate.
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Closed Throttle
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ON/OFF
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0
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1
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While crankshaft is stationary or rotating.
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Shows ON when the throttle is completely closed.
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Shows when the control module regards the throttle as being closed. An adaptation of the position may need to be performed after adjusting the throttle. See activations.
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