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 on 6 cylinder engines and all cylinders on 5-cylinder engines.
Bank 2: indicates cylinders 4-6 on 6-cylinder engines.

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

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

Intake air temperature (IAT) inlet
Measurement range -48 to +143 °C.
The engine control module (ECM) calculates the temperature from the intake air temperature sensor.

°
Ambient temperature C
Measurement range -40 to +110 °C.
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) calculates the boost pressure from the boost pressure sensor. The pressure is relative to atmospheric pressure.

Ignition advance
Measurement range between -96 and 95.3°before top dead centre (BTDC).
Normal value at idle speed between 0° and 20° before top dead centre (BTDC).
The value may be lower than 0° when warming up the three-way catalytic converter (TWC).

Air mass
Measurement range 0-1020 kg/h.
The value indicates the mass air flow that passes through the mass air flow (MAF) sensor.
The engine control module (ECM) calculates the value based on the mass air flow (MAF) sensor signal.
Normal value with the engine at operating temperature and idling, neutral and air conditioning (A/C) switched off: approximately 14 kilograms per hour.

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.

Mass air flow, correction value
Measurement range 0-4.
The value is a stored average of the correction factor of the mass air flow that the engines draws in.
Mass air flow, correction factor= The control module's calculated desired value for the mass air flow divided by (/) the actual measured mass air flow.
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 the engine control module (ECM) terminal #A70.

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

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

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

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

Throttle angle
Measurement range 0-100 %.
The control module derives the value from the throttle position (TP) sensor in the electronic throttle module. The signal goes on to the Control area network (CAN) from the throttle unit to the engine control module (ECM).
The value indicates the throttle opening.
Approximately 0 % = throttle closed.
Approximately 100 % = wide open throttle (WOT).

Leakage flow over throttle
Measurement range 0-655 kg/h.
The value indicates how much air passes through the throttle at closed throttle position (CTP). The control module calculates the value from the mass air flow (MAF) sensor and the throttle position (TP) sensor signal.
The normal value is approximately 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) calculates the value from the clutch pedal sensor signal.
The value indicates the clutch pedal position.
When the clutch pedal released the value is 60-70 %. The value decreases as the clutch pedal is depressed.

Clutch position sensor
The engine control module (ECM) calculates the value from the clutch pedal sensor signal.
The value indicates how the engine control module (ECM) interprets the clutch pedal position.
Active = clutch pedal depressed.
Not active = clutch pedal released.

Brake pedal, volts
Measurement range 0-5 V.
The engine control module (ECM) calculates the value from the brake pedal sensor signal.
The value indicates the brake pedal position.
The value is approximately 2.9-3.2 V when the brake pedal is unaffected and decreases when the brake pedal is pressed.

Brake lamp switch
The engine control module (ECM) calculates the value from the brake pedal sensor signal.
The value indicates how the engine control module (ECM) interprets the brake pedal sensor signal
ON = brake lamp switch on.
OFF = brake lamp switch unaffected.

AC pressure
Measurement range -176 to +3277 kPa.
The engine control module (ECM) calculates the value from the signal from the air conditioning (A/C) pressure sensor.
The value indicates the pressure at the high-pressure side of the air conditioning (A/C) system.
The engine control module (ECM) calculates 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 deployment signal from the engine control module (ECM) to the air conditioning (A/C) compressor relay.
OFF = The engine control module (ECM) does not activate the air conditioning (A/C) compressor relay.
ON = The engine control module (ECM) activates the air conditioning (A/C) compressor relay.

Turbocharger (TC) control valve
Measurement range 0-100 %.
The value indicates the deployment signal from the control module for deploying the turbocharger (TC) control valve, the amount the turbocharger (TC) control valve opens to adjust the turbo pressure.
0 % = no control (turbocharger (TC) control valve closed).
100 % = full control (the turbocharger (TC) control valve opens completely).

Canister purge (CP) valve
Measurement range 0-100 %
The value indicates the signal transmitted by the control module to control the EVAP canister purge valve (the amount the valve must open to empty the canister).
0 % = no control (EVAP canister purge valve closed).
100 % = full control (EVAP canister purge valve opens completely).

Camshaft reset valve
Measurement range 0-100 %
The pulse ratio transmitted by the engine control module (ECM) to control the camshaft reset valve.
The value indicates control of the camshaft reset valve to control the camshaft shift angle.
The value decreases with increased control of the camshaft shift angle. When the camshaft shift angle reaches the control module target value the pulse ratio is 50% (±10 %).

The camshaft shift angle
Measurement range between -128° to +128°.
The control module calculates the value by comparing the position of the camshaft with the position of the crankshaft.
The value indicates the offset of the camshaft 0-position in relation to the crankshaft TDC (0°). (The camshaft 0-position = the camshaft position set alignment in relation to the crankshaft 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 target value calculated by the engine control module (ECM) for the "Camshaft cam timing".
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° to +20°.
The value stored in the control module for adaptation of the camshaft shift angle (flanks 1-4). Theoretically the values for flanks 1-4 should be the same. However because of mechanical tolerances the values may vary between the different flanks by approximately ±2°.
The value indicates how much the control module has adapted to the position of the camshaft, i.e. the deviation between the 0-position for the camshaft when camshaft control is not active (the camshaft's 0-position = the camshaft position set alignment in relation to the crankshaft TDC (0°).
Normal value is between -7° to+7°.
Turbocharged engines: The value must be controlled at an engine speed above idling speed but lower than 1200 r/min.
Naturally aspirated engines: The value must be controlled at idle speed.

Fuel tank pressure
Certain markets only.
Measurement range -32 to +32 hPa.
The value indicates the fuel tank pressure, relative pressure in comparison to atmospheric pressure.
The control module derives the value from the fuel tank pressure sensor.

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

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

Normal value with the engine at operating temperature at idle speed 2.0-4.0 ms

Short-term fuel trim, bank x
Measurement range 0-2.
The value displays how much the injection period needs to be corrected (from the preprogrammed injection period in the control module ) to reach lambda=1. If the engine runs lean or rich (lambda deviates from 1), the short-term fuel trim injection period is increased or decreased so that lambda;=1. The average value of this parameter from different engine speed and load ranges is used for the different fuel trim adaptations (idling, lower part load and upper part load) so that the short-term fuel trim is always around 1.
Short-term fuel trim = the actual injection period required to reach lambda=1, divided by (/) the injection period in preprogrammed in the control module to reach lambda=1.
The normal value oscillates around 1, when fuel trim for each engine speed (RPM) / load range is ready.
Value over 1: the control module increases the injection period (to prevent a lean fuel / air mix).
Value under 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.

Hint: When lambda deviates from 1, "short-term fuel trim" initially compensates at each engine speed/load range (idle, lower part load and upper part load). When diagnostic trouble codes (DTCs) are erased, the values for "short-term fuel trim" are reset, this means that "short-term fuel trim" becomes too high or low when driving at relevant engine speed/load range before fuel trim is complete. For further information about fuel trim, see VIDA Design and function, Fuel trim.

Long-term fuel trim bank x, idle speed
Measurement range from -72 to +72 %.
Additive fuel trim (correcting the injection period), trim that occurs at idle speed. The value indicates how much the fuel trim has been corrected at idle speed so that the trim value can again oscillate around 1.
In the event of an air leakage for example, the value will increase at idle speed (= longer injection time). This is to compensate the fuel / air mix for air capacity. Regardless of the load /engine speed, the same injection time is added. This means that the parameter value does not significantly affect the fuel / air mix at higher loads / engine speeds.
Normal value when the engine is idling: 0 ± 5 %.
Value over 0 %: the control module increases the injection period (to prevent a lean fuel / air mix).
Value under 0 %: the control module decreases the injection period (to prevent a rich fuel air mix).

Hint: When diagnostic trouble codes (DTCs) are erased, the "long-term fuel trim" returns to 0%. For more information about fuel-trim, see VIDA Design and Function, Fuel trim.

Long-term fuel trim bank x, lower part load
Measurement range 0-2.
Multiplicative fuel trim (correcting the injection period), trim that occurs at lower part load (normal road driving). The value stored in the control module indicates how much the fuel trim in the upper part load range has been corrected so that the trim value can again oscillate around 1 at the lower part load.
In the event of low fuel pressure for example, the value will increase (= longer injection time). This is to compensate the fuel/air mix for the lack of fuel.
Normal value 1 ± 0.1. The lower part load range of the engine must be reached for the value to be updated (normal road driving).
Approximately 30 minutes of driving in the lower part load may be required before fuel trim is complete (complete = fuel trim oscillates around 1 at lower part load).
Value over 1: the control module increases the injection period (to prevent a lean fuel / air mix).
Value under 1: the control module decreases the injection period (to prevent a rich fuel air mix).

Hint: When diagnostic trouble codes (DTCs) are erased, the "long-term fuel trim" returns to 1. For more information about fuel trim, see VIDA Design and Function, Fuel trim.

Long-term fuel trim bank x, upper part load
Measurement range 0-2.
Multiplicative fuel trim, trim that occurs at the upper part load (high speed / acceleration on the road). The value stored in the control module indicates how much the fuel trim in the upper part load range has been corrected so that the fuel trim value can again oscillate around 1 at the upper part load.
In the event of low fuel pressure for example, the value will increase (= longer injection time). This is to compensate the fuel/air mix for the lack of fuel.
Normal value 1 ± 0.1. The upper part load range of the engine must be reached for the value to be updated (accelerating road driving).
Approximately 30 minutes of driving in the lower part load may be required before the fuel trim is complete (complete = fuel trim oscillates around 1 at upper part load).
Value over 1: the control module increases the injection period (to prevent a lean fuel / air mix).
Value under 1: the control module decreases the injection period (to prevent a rich fuel / air mix).

Hint: When diagnostic trouble codes (DTCs) are erased, the "long-term fuel trim" returns to 1. For more information about fuel trim, see VIDA Design and Function, Fuel trim.

Long-term fuel trim, bank x
C/L= Closed Loop, fuel trim is active
O/L = Open Loop, fuel trim is not active

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

Rear heated oxygen sensor (HO2S), bank x
Measurement range -0.2 to +1.13.
The signal from the rear heated oxygen sensor (HO2S) 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 (FP) relay
OFF = The engine control module (ECM) does not activate the fuel pump (FP) relay.
ON = The engine control module (ECM) activates the fuel pump (FP) relay via the central electronic module (CEM).

Vehicle speed
Measurement range 0-319 km/h
The value displays the vehicle speed.

Engine cooling fan (FC) stage 1
ON = The engine control module (ECM) activates the lowest speed of the engine cooling fan (FC).
OFF = The engine control module (ECM) does not activate the lowest speed of the engine cooling fan (FC).
Stage 1 of the engine cooling fan (FC) begins at approximately 105 °C.
Stage 2 and stage 3 may vary depending on the version and equipment level. The normal value is approximately 110 °C for stage 2 and approximately 115 °C for stage 3. There may be a certain amount of variation.
The values listed are with the air conditioning (A/C) off and no faults.

Engine cooling fan (FC) stage 2
ON = The engine control module (ECM) activates engine cooling fan (FC) at intermediate speed.
OFF = The engine control module (ECM) does not activate the engine cooling fan (FC) at intermediate speed.
See Engine cooling fan (FC) stage 1 for the engagement temperature.

Engine cooling fan (FC) stage 3
ON = The engine control module (ECM) activates the highest speed of the engine cooling fan (FC).
OFF = The engine control module (ECM) does not activate the highest speed of the engine cooling fan (FC).
See Engine cooling fan (FC) stage 1 for the engagement temperature.

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

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

Cruise control set-
The cruise control must be on when reading this parameter.
OFF = SET- not activated.
ON = SET- activated.

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.