Description of Parameters

Description of parameters

Explanation
Not all the parameters described need to be implemented in the control module. This varies between different systems and markets.
Bank 1: indicates cylinders 1-3 for 6-cylinder engines and all cylinders for 5-cylinder engines.
Bank 2: indicates cylinders 4-6 for 6-cylinder engines.

Engine speed
Measurement range: 0-10400 rpm.
The control module derives engine speed (rpm) from the engine speed (rpm) sensor signal.
Idling speed varies depending on the engine coolant temperature.

Engine coolant temperature (ECT)
Measurement range: -48 °C (-54 °F) to +143 °C (289 °F).
The control module derives the temperature from the engine coolant temperature (ECT) sensor signal.

Intake air temperature
Measurement range: -48 to +143 °C (-54 to +289 °F).
The engine control module (ECM) derives the temperature from the intake air temperature sensor.

Outside temperature °C
Measurement range: -40 to +110 °C (-40 to 230 °F).
The engine control module (ECM) derives the temperature from the outside temperature sensor signal.

Atmospheric pressure
Measurement range: 0-5120 hPa.
The value indicates atmospheric pressure at the engine control module (ECM).
Normal value at sea level is 1,013 hPa.

Boost pressure
Measurement range: 0-2550 hPa.
The value indicates the pressure in the intake manifold.
The engine control module (ECM) derives boost pressure from the boost pressure sensor. Boost pressure is relative to atmospheric pressure.

Ignition advance
Measurement range: -96 to 95.3° BTDC.
The normal value at idling speed is between 0° and 20° BTDC.
The value may be lower than 0° while the catalytic converter is warming up.

Air mass
Measurement range: 0-1020 kg/h.
The value indicates the air mass passing through the mass air flow (MAF) sensor.
The engine control module (ECM) derives the value based on the signal from the mass air flow (MAF) sensor.
Normal value with the engine idling at operating temperature, in neutral and with the air conditioning off: approximately 14 kg/h.

Note! Other values apply if the generator (GEN) is under load, if for example, high beam is on, the heated rear windshield is on etc.

Air mass, correction value
Measurement range: 0-4.
The value is a stored average correction factor for the air mass sucked into the engine.
Air mass, correction factor = Control module's calculated desired value for air mass divided by (/) the actual, measured air mass.
Normal value for turbocharged engines: 1 (±0.1).
Normal value, induction engines -99: 1 (±0.1).
Normal value, induction engines 00-: 1 (±0.1).

Battery voltage
Measurement range 0-17.95 V.
The normal value is 13.5-14.5 V when the generator (GEN) is charging.
The value indicates the voltage from the system relay to engine control module (ECM) terminal #A70.

Power supply, 5 V
Measurement range: 0-5 V.
Normal value: approx. 5 V.
The value indicates the voltage supplied to components from engine control module (ECM) terminal #A39.

Accelerator pedal, analog
Measurement range 0-100 %.
Analog signal from the accelerator pedal position sensor to the engine control module (ECM). The control module drives the value from the accelerator pedal position sensor.
The value indicates the accelerator pedal (AP) position.
Approximately 6 %= accelerator pedal is completely released.
Approximately 88 %= the accelerator pedal (AP) completely depressed.

Accelerator pedal, PWM
Measurement range 0-100 %.
PWM signal from the accelerator pedal position sensor to the engine control module (ECM). The control module drives the value from the accelerator pedal position sensor.
The value indicates the accelerator pedal (AP) position.
Approximately 6 %= accelerator pedal is completely released.
Approximately 88 %= the accelerator pedal (AP) completely depressed.

Accelerator pedal, PWM (via ETM)
Measurement range 0-100 %.
PWM signal from the accelerator pedal position sensor to the electronic throttle module (ETM) (via the engine control module (ECM)). The signal then travels on CAN from the electronic throttle module (ETM) to the engine control module (ECM).
The value indicates how the electronic throttle module (ETM) interprets the accelerator pedal position.
Approximately 6 %= accelerator pedal is completely released.
Approximately 88 %= the accelerator pedal (AP) completely depressed.

Throttle, position
Measurement range 0-100 %.
The control module derives the value from the throttle position sensor in the electronic throttle module (ETM). The signal is sent from the electronic throttle module (ETM) to the engine control module (ECM) via the CAN network.
The value indicates how much the throttle is open.
Approximately 0 % = throttle closed.
Approximately 100% = throttle fully open.

Leakage flow across throttle
Measurement range: 0-655 kg/h.
The value indicates how much air passes through the throttle when it is closed. The engine control module (ECM) derives the value from the mass air flow sensor and throttle position sensor signals.
The normal value is approx. 5 ± 4 kg/h

Note! Other values apply if there is air leakage on the intake system.

Clutch pedal position
Measurement range 0-100 %.
The engine control module (ECM) derives the value based on the signal from the clutch pedal position sensor.
The value indicates the clutch pedal position.
When the clutch is completely released, the value is approx. 60-70%. The value decreases when the clutch pedal is depressed.

Clutch pedal position sensor
The engine control module (ECM) derives the value based on the signal from the clutch pedal position sensor.
The value indicates how the engine control module (ECM) interprets the clutch pedal position.
Active=clutch pedal depressed.
Inactive=clutch pedal released.

Brake pedal position, volts
Measurement range: 0-5 V.
The engine control module (ECM) derives the value based on the signal from the brake pedal position sensor.
The value indicates the brake pedal position.
When the brake is completely released, the value is approx. 2.9-3.2 V. The value decreases when the brake pedal is depressed.

Stop lamp switch
The engine control module (ECM) derives the value based on the signal from the brake pedal position sensor.
The value indicates how the engine control module (ECM) interprets the brake pedal sensor signal.
ON = stop lamp switch on.
OFF = stop lamp switch unaffected.

AC pressure
Measurement range: -176 to +3277 kPa.
The engine control module (ECM) derives the value from the air conditioning (A/C) pressure sensor signal.
The value indicates the pressure at the high-pressure side of the air conditioning (A/C) system.
The engine control module (ECM) calculates the pressure based on the signal from the air conditioning (A/C) pressure sensor. The pressure is given as a value relative to the atmospheric pressure.

Air conditioning (A/C) compressor, active
The deployed signal from the engine control module (ECM) to the A/C compressor relay.
OFF = The engine control module (ECM) does not activate the A/C compressor relay.
ON = The engine control module (ECM) activates the A/C compressor relay.

Turbo control valve
Measurement range 0-100 %.
The value indicates the signal deployed by the control module to regulate the turbo control valve - how much the turbo control valve should open to adjust turbo pressure.
0% = no regulation (turbo control valve closed).
100% = full regulation (turbo control valve fully open).

Canister purge (CP) valve
Measurement range 0-100 %.
The value indicates the signal deployed by the control module for control of the EVAP valve, i.e. how much the EVAP valve should open to purge the canister.
0% = no regulation (EVAP valve closed).
100% = full regulation (EVAP valve fully open).

Reset valve camshaft
Measurement range 0-100 %.
The pulse ratio deployed by the engine control module (ECM) to regulate the camshaft reset valve.
The value indicates regulation of the camshaft reset valve for controlling camshaft shift angle.
The value decreases with increased deflection of the camshaft shift angle. Once the camshaft shift angle has reached the control module's target value, the pulse ratio is 50% (±10%).

Camshaft shift angle
Measurement range between -128° to +128°.
The engine control module (ECM) derives the value by comparing the camshaft position with the crankshaft position.
The value indicates displacement of the camshaft 0-position in relation to the crankshaft's TDC (0°). (Camshaft 0-position = camshaft position's fixed fit with crankshaft's TDC (0°).

Hint: The value should follow the parameter "Camshaft shift angle, desired value" with an accuracy of ±3°. Comparison should be made under stable conditions such as stable engine speed and stable load.

Camshaft shift angle, desired value
Measurement range between 0° to +64°.
The engine control module (ECM)'s calculated target value for "Camshaft shift angle.
The value indicates what the "camshaft shift angle" should be.
Comparison with the parameter "camshaft shift angle" should be done under stable conditions, such as stable engine speed and stable load.

Camshaft adaptation, flank x
Measurement range between -20° and +20°.
The control module's stored value for adaptation of the camshaft shift angle (flank 1-4). Theoretically, the value of flank 1-4 should be equal, but due to mechanical tolerances, the value can deviate approx. ±2° between different flanks.
The value indicates how much the control module has adapted camshaft position, i.e. the deviation of the camshaft's 0-position when camshaft regulation is inactive (camshaft 0-position = camshaft position's fixed fit with crankshaft's TDC (0°).
Normal value is between -7° and +7°.
Turbocharged engines: The value should be checked at an engine speed between idling and 1200 rpm.
Induction engines: the value should be checked at idling speed.

Tank pressure
Certain markets only.
Measurement range: -32 hPA to +32 hPA.
The value indicates the relative pressure in the tank in relation to atmospheric pressure.
The engine control module (ECM) derives the value from the tank pressure sensor.

EVAP canister shut-off valve
Certain markets only.
Measurement range 0-100 %.
The value indicates the signal deployed by the control module to regulate the canister valve.
OFF = Engine control module (ECM) closes the canister valve.
ON = Engine control module (ECM) opens the canister valve.

Injection period, bank x
Measurement range: 0.0-150 ms.
The engine control module (ECM)'s deployed signal for injection period.

Normal value with engine idling at operating temperature: 2.0-4.0 ms

Short-term fuel trim, bank x
Measurement range 0-2.
The value indicates how much the injection period must be corrected (from control module's preprogrammed injection period) so that lambda=1. If the engine runs lean/rich (lambda deviates from 1), the short-term fuel trim's injection period is increased/decreased so that lambda=1. The average of this parameter from different engine speeds/load ranges is registered in the various lambda adaptations (idling, lower partial load and upper partial load) so that the short-term fuel trim can always be around 1.
Short-term fuel trim = the actual injection period necessary to achieve lambda=1, divided by (/) the injection period preprogrammed in the control module to achieve lambda=1.
Normal value hovers around 1.
Value over 1: The control module increases the injection period (to prevent a lean fuel/air mix).
Value less than 1: The control module decreases the injection period (to prevent a rich fuel/air mix).
The parameter must be checked under stable conditions, such as stable engine speed (RPM) and load.

Lambda adaptation, bank x, idling speed
Measurement range between -72% and +72%.
Additive adaptation of the short-term fuel trim(injection period correction) - adaptation occurs at idling speed. The value indicates how much the short-term fuel trim has been corrected at idling speed so that the short-term fuel trim value can once again be around 1.
Normal value at idling speed 0% ± 5%.
Value under 0%: The control module increases the injection period (to prevent a lean fuel/air mix).
Value over 0%: The control module reduces the injection period (to prevent a rich fuel/air mix).

Lambda adaptation, bank x, lower partial load
Measurement range 0-2.
Multiplicative adaptation of the short-term fuel trim (injection period correction) - adaptation occurs at lower partial load (normal road driving). The value stored in the control module indicates how much the short-term fuel trim in the upper partial load range has been corrected so that the short-term fuel trim value can once again be around 1 at lower partial load.
Normal value 1 ± 0.1. The engine's lower partial load range (normal road driving) must be achieved in order for the value to be updated.
Value under 1: The control module increases the injection period (to prevent a lean fuel/air mix).
Value over 1: The control module reduces the injection period (to prevent a rich fuel/air mix).

Lambda adaptation, bank x, upper partial load
Measurement range 0-2.
Multiplicative adaptation of short-term fuel trim - adaptation occurs at upper partial load (high speed/acceleration on the road). The value stored in the control module indicates how much the short-term fuel trim has been corrected in the upper partial load range so that the short-term fuel trim value can once again be around 1 at upper partial load.
Normal value 1 ± 0.1. The engine's upper partial load range (on road with acceleration) must be achieved in order for the value to be updated.
Value under 1: The control module increases the injection period (to prevent a lean fuel/air mix).
Value over 1: The control module reduces the injection period (to prevent a rich fuel/air mix).

Fuel trim, bank x
C/L = Fuel trim is active (closed loop)
O/L = Fuel trim is inactive (open loop)

Front heated oxygen sensor, bank x
Measurement range 0-16.
Normal value is lambda=1.
At rich mixture is lambda less than 1.
At lean mixture is lambda greater than 1.

Rear heated oxygen sensor, bank x
Measurement range: -0.2 to +1.13.
Signal from rear heated oxygen sensor to the engine control module (ECM).
Normal value when the engine is running at even load is approximately 0.6 V.
Voltage can vary between -0.2 and 0.9 V. During conditions such as engine braking, voltage can reduce to -0.2 V.

Fuel pump, relay
OFF = Engine control module (ECM) does not activate the fuel pump relay.
ON = Engine control module (ECM) activates the fuel pump relay.

Speed
Measurement range 0-319 km/h (0-198 mph)
The value indicates vehicle speed.

Electric cooling fan, speed 1
ON = Engine control module (ECM) activates the electric cooling fan's low speed.
OFF = Engine control module (ECM) does not activate the electric cooling fan's low speed.

Electric cooling fan, speed 2
ON = Engine control module (ECM) activates the electric cooling fan's high speed.
OFF = Engine control module (ECM) does not activate the electric cooling fan's high speed.

Cruise control, resume
The cruise control must be on when reading this parameter.
OFF = resume button not actuated.
ON = resume button actuated.

Cruise control, set+
The cruise control must be on when reading this parameter.
OFF= SET+ button not actuated.
ON = SET+ button actuated.

Cruise control, SET-
The cruise control must be on when reading this parameter.
OFF= SET- button not actuated.
ON = SET- button actuated.

Boost pressure (actual value)
Measurement range: 0-2000 hPa, absolute pressure (boost pressure- absolute zero pressure(0 hPa)).
The Engine control module (ECM) receives information about the current boost pressure via the boost pressure sensor.
The actual value must correspond to the desired value ± 50hPa.

Boost pressure (desired value)
Measurement range: 0-2000 hPa, absolute pressure (boost pressure- absolute zero pressure(0 hPa)).
The engine control module (ECM) receives information about the current throttle angle via the throttle position sensor, speed (rpm), engine load, knocks etc. These parameters are used to calculate the boost pressure that is permitted in various operating conditions.