Description Of Frozen Values, ECM

Description of frozen values

Explanation
Not all the parameters described need to be implemented in the control module. This varies from system to system.
Frozen values are parameter values that are stored when a diagnostic trouble code (DTC) is stored.

Status
A diagnostic trouble code (DTC) stored in the engine control module (ECM) can be found in four different status positions:
- Temporary: When a fault is detected by the engine control module (ECM) the diagnostic trouble code (DTC) is first stored in the Temporary status.
- Not yet stored: If the fault remains at the next diagnosis the diagnostic trouble code (DTC) is stored in the Not yet stored status.
- Stored: If the fault is still active at the next operating cycle, the diagnostic trouble code (DTC) is stored in Stored status.
- Erased: If an existing fault disappears and does not recur after a certain number of fault-free operating cycles, the engine control module (ECM), stores the diagnostic trouble code (DTC) as status Erased depending on the diagnostic trouble code (DTC) and previous status of the diagnostic trouble code (DTC). The diagnostic trouble code (DTC) remains here until the engine control module (ECM) is erased of diagnostic trouble codes (DTCs) or is disconnected from current.

Hint: The diagnostic trouble codes (DTCs) in Temporary, Not yet stored and Stored are read in the normal manner. When reading with Reading off extended diagnostic trouble code (DTC) information the diagnostic trouble codes (DTCs) can also be read in Erased status.

°
Outside temperature (via central electronic module (CEM)) (C)
Measurement range -40 - +120 °C.
The engine control module (ECM) derives the temperature from the outside temperature sensor signal.

Atmospheric pressure (Pa)
Measurement range 0-2267 hPa.
The value indicates atmospheric pressure at the engine control module (ECM). Normal value at sea level is 1013 hPa.

Vehicle speed (km/h)
Measurement range 0 - 255 km/h.
The value displays the vehicle speed.

Engine speed (rpm)
Measurement range 0-10400 rpm.
The engine control module (ECM) derives the engine speed (RPM) from the engine speed (RPM) sensor signal. The idle speed varies depending on the engine coolant temperature (ECT) (850 ± 50rpm).

Engine load (g/rev)
The parameter indicates the engine load.
Measurement range 0-2 g/rev.

Manifold absolute pressure (MAP) (Pa)
Measurement range -400 - 2200 hPa. The normal pressure (atmospheric pressure at sea level) is approximately 1013 hPa at ignition on (open throttle).

°
Engine coolant temperature (ECT) (C)
Measurement range -40 - +120 °C.
The engine control module (ECM) derives the temperature from the engine coolant temperature (ECT) sensor signal.

Fuel trim, rapid adjustment
The parameter displays the adaptation factor of the lambda probe.
Measurement range 0-2 lambda-adap. Compensates the injection period at the relevant load so that the lambda-value can be correctly reached. Normal value 1.

Fuel trim, slow adjustment
The parameter displays the adaptation factor of the lambda probe.
Measurement range 0-2 lambda-adap. Compensates the injection period at the relevant load so that the lambda-value can be correctly reached. Normal value 1.

Gear shift position
The parameter indicates the gear position.
Inactive = Gear position P/N.

Engine cooling fan (%)
Measurement range: 0 - 100%
PWM signals transmitted by the engine control module (ECM) to the engine cooling fan control module to control the speed of the engine cooling fan.

A/C request
The deployment signal from the engine control module (ECM) to the air conditioning (A/C) compressor relay.
Active = The engine control module (ECM) does not activate the air conditioning (A/C) compressor relay.
Inactive = The engine control module (ECM) activates the air conditioning (A/C) compressor relay.

Air conditioning (A/C) compressor
The parameter indicates the air conditioning (A/C) compressor status.

Brake pedal
The parameter indicates the brake pedal position.

EVAP canister purge valve
The parameter indicates the EVAP canister purge valve position.

Cruise control
The parameter indicates cruise control status.

EVAP canister shut-off valve
The parameter indicates the EVAP canister shut-off valve position.

Battery voltage (V)
Measurement range 0-20 V.
The normal value is 13-14.5 V when the generator (GEN) is charging.
The value indicates the voltage at the engine control module (ECM).

°
Passenger compartment temperature (via central electronic module (CEM)) (C)
The parameter indicates the car's passenger compartment temperature.

Total mileage (via central electronic module (CEM)) (km)
The parameter indicates the car's total mileage.

Fuel pressure (Pa)
Measurement range 0-1067 kPa.
The parameter indicates absolute pressure.
Normal value 480 ± 5 kPa when idling with the engine at operating temperature. The pressure drops when the ignition is switched off.

°
Ignition advance ()
Measurement range -20 - +62 ° BTDC.
Normal value when idling varies depending on the engine coolant temperature (ECT) etc.

Mass air flow (g/s)
Measurement range 0-200 g/s.
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 signal from the mass air flow (MAF) sensor.
Normal value with the engine at operating temperature and idling and under no load, neutral and air conditioning (A/C) switched off: approximately 4 g/s.

°
Intake air temperature (IAT) (C)
Measurement range -40 - +120 °C.
The engine control module (ECM) calculates the temperature from the temperature sensor for intake air (integrated in the mass air flow (MAF) sensor).

Throttle angle, actual value (%)
Measurement range 0 -100 %.
The engine control module (ECM) calculates the value from potentiometer 1 for the throttle position (TP) sensor. The value indicates the throttle opening.
If a fault is detected in the throttle position (TP) sensor, potentiometer 1, by the engine control module (ECM), the value from the throttle position (TP) sensor, potentiometer 2, will be used to represent the throttle angle. This presumes that the function of throttle position (TP) sensor, potentiometer 2 is OK.
0 % = throttle shut.
100 % = throttle fully open. This corresponds to an opening angle of approximately 84 degrees.
Must follow the parameter "Throttle angle, desired value".

Fuel level (via central electronic module (CEM)) (I)
The parameter indicates the fuel level in the fuel tank.

°
Calculated three-way catalytic converter (TWC) temperature (C)
The parameter indicates the calculated temperature of the three-way catalytic converter (TWC).

°
Calculated exhaust temperature (C)
The parameter indicates the calculated temperature of the exhaust temperature.

Throttle position, circuit 1 (%)
Measurement range -3 - +130 %.
Normal value 0 - 100 %.
There is an electrical fault if the displayed value is outside the measurement range. The value must increase with increased throttle angle.
Approximately 0 % = throttle closed.
Approximately 100 % = wide open throttle (WOT). This corresponds to an opening angle of approximately 84 degrees.

Throttle position, circuit 2 (%)
Measurement range -4 - +140 %.
Normal value 0 - 100 %.
There is an electrical fault if the displayed value is outside the measurement range. The value must increase with increased throttle angle.
Approximately 0 % = throttle closed.
Approximately 100 % = wide open throttle (WOT). This corresponds to an opening angle of approximately 84 degrees.

Accelerator pedal (AP), PWM (%)
Measurement range 0 -100 %.
PWM signal from the accelerator pedal (AP) position sensor to the engine control module (ECM). The value indicates the accelerator pedal (AP) position.
Approximately 8 %= the accelerator pedal (AP) completely released.
Approximately 88 %= the accelerator pedal (AP) completely depressed.
The PWM signal is used if there is a fault with the analog signal.

Hint: The value must follow the parameter "Accelerator pedal, analog".

Accelerator pedal (AP), analog (%)
Measurement range 0 -100 %.
Analog signal from the accelerator pedal (AP) position sensor to the engine control module (ECM). The value indicates the accelerator pedal (AP) position.
Approximately 8 %= the accelerator pedal (AP) completely released.
Approximately 88 %= the accelerator pedal (AP) completely depressed.
The analog signal is usually used by the engine control module (ECM).

Hint: The value must follow the parameter "Accelerator pedal, PWM".

Throttle angle, desired value (%)
Measurement range 0 -100 %.
The value indicates the signal transmitted to the throttle unit from the engine control module (ECM).
0 % = throttle shut.
100 % = throttle fully open. This corresponds to an opening angle of approximately 84 degrees.