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Bus communication, Trionic T7

Bus communication, Trionic T7

For a further description of the car's bus system, see System overview, bus and diagnostic communication, petrol

Missing control module Diagnostic trouble code
TCM

P1623

MIU

P1622

TC/ABS/ESP

P1625



The engine control module uses the following information:

Information Sensor system Description
Maximum permitted torque (Nm)

TCM

TCM sends maximum permissible torque, unit Nm. The value is used in the air mass control for engine torque limitation.

Sports mode selected (ON/OFF)

TCM

TCM sends sport position, unit ON/OFF. The value is used in the air mass control to correct the conversion of the pedal position to requested air mass/combustion.

Selector lever position, automatic transmission (PRND321)

TCM

TCM sends selector lever position, unit PRND321. The value is used in the air mass control for idle speed control.

Vehicle speed, left rear wheel (km/h)

MIU

MIU sends speed, unit km/h. The value is used by cruise control and as a substitute value if the speed signal from ABS or TC/ABS is missing.

Reverse gear selected (ON/OFF)

DICE

DICE sends reverse gear engaged, unit ON/OFF. The value is used to determine if first gear or reverse gear is engaged as the gear ratio is not enough to distinguish between them.

A/C request (ON/OFF)

DICE

DICE sends A/C request, unit ON/OFF. The value is used in the air mass control, compensation, to compensate for the increase in load. The control module also activates the A/C relay.

A/C pressure, high pressure side (bar)

DICE

DICE sends pressure, unit bar. The value is used in the air mass control, compensation, to calculate the increase in load before the A/C compressor is activated.

Current consumption (A)

DICE

DICE sends the calculated current consumption of the electrically heated rear window and radiator fans just before they are activated, unit A. The value is used in the air mass control, compensation, to compensate for the increase in load.

Fast idling speed (ON/OFF)

DICE

DICE sends fast idling speed, unit ON/OFF. ON is sent if the radiator fan is activated for high-speed during the present driving cycle. The value is used in the idle speed control.

Brake lights (ON/OFF)

TWICE

TWICE sends brake lights, unit ON/OFF. The value is used in the air mass control for engine torque limitation.

Fuel level (Litres)

MIU

MIU sends fuel level, unit Litres. The value is used in the on-board diagnostics to generate special diagnostic trouble codes during misfiring in conjunction with low fuel levels and for adaptation of the tank pressure sensor value.

CHECK ENGINE Request (ON/OFF)

TCM

TCM sends request, unit ON/OFF. The value is used in the on-board diagnostics to turn on the CHECK ENGINE lamp when ON is sent. Diagnostic trouble code P1624 is generated to indicate a fault in TCM.

Immobilizer (ON/OFF)

TWICE

TWICE sends immobilizer, unit ON/OFF. The value is used in the fuel injection to activate fuel shut-off.

Ignition +50 circuit (ON/OFF)

DICE

DICE sends +50, unit ON/OFF. The value is used for diagnosis of the crankshaft position sensor.

Vehicle speed, front right wheel

TC/ABS

The signal comes from the FR wheel speed sensor. The value is used for Traction Control.

Vehicle speed, output speed

TCM

Engine speed signal converted to vehicle speed.

The engine speed signal comes form a sensor on the gearbox. The output speed is the same as the vehicle speed and its value is used for engine torque limitation.

Diagnostics

DICE/diagnostic tool

The diagnostic tool sends a diagnostics request via DICE, no unit. The value is used to respond to the current request.



The engine control module sends the following information:

Information User system
Engine torque (Nm)

TCM

TC/ABS/ESP

The current air mass/combustion converted to engine torque, unit Nm. The value is used by TCM and TC/ABS/ESP.

Accelerator pedal position (%)

TCM

TC/ABS/ESP

The highest requested value of air mass/combustion from either the accelerator pedal position or cruise control is chosen. The value is converted to the corresponding accelerator position, unit percent. The value is used by TCM and TC/ABS/ESP.

Kickdown (ON/OFF)

TCM

When the voltage from pedal potentiometer 1 corresponds with the kickdown position (below 1.50 V), kickdown ON, unit ON/OFF is sent. The value is used by TCM.

Engine speed (rpm)

MIU, TCM, ACC and TC/ABS/ESP

Current engine speed is sent, unit rpm. The value is used by TCM, ACC, MIU and TC/ABS/ESP.

Engine coolant temperature (°C)

MIU, DICE and ACC

Current temperature is sent, unit °C. The value is used by ACC, MIU and DICE.

Engine running (ON/OFF)

ACC, DICE

ON, unit ON/OFF, is sent when the engine speed exceeds 650 rpm. The value is used by ACC and DICE.

CHECK ENGINE (ON/OFF)

MIU

ON, unit ON/OFF, is sent when the on-board diagnostics reports that the lamp is to be turned on. The value is used by MIU.

SHIFT UP (ON/OFF)

MIU

ON, unit ON/OFF, is sent at low loads and high engine speeds and at very high engine speeds irrespective of load. The value is used by MIU.

CRUISE lamp (ON/OFF)

MIU

ON, unit ON/OFF, is sent when cruise control is activated with the switch. The value is used by MIU.

Fuel consumed since start (ml)

MIU

When the ignition is switched on, the value is 0 ml and is then accumulated for each injection, unit ml. The value is used by MIU.

Diagnostics

DICE/diagnostic tool

Trionic T7 responds to the diagnostics request from the diagnostic tool via DICE, no unit.