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MID 128, PID 106 Charge Air Pressure: MID 128: Engine Control Unit Fault Code

This document summarizes a malfunction with the charge air pressure sensor (MID 128, PID 106) in the engine control unit. There are three possible fault codes - FMI 0 indicates excessively high charge air pressure, while FMI 3 and 5 indicate faults with the sensor or sensor circuit. An orange or red lamp will flash and engine power will be cut depending on the specific fault code. The circuit description explains that the combined sensor measures both pressure and temperature, and requires operating voltage from the engine control unit to function properly.

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3K views1 page

MID 128, PID 106 Charge Air Pressure: MID 128: Engine Control Unit Fault Code

This document summarizes a malfunction with the charge air pressure sensor (MID 128, PID 106) in the engine control unit. There are three possible fault codes - FMI 0 indicates excessively high charge air pressure, while FMI 3 and 5 indicate faults with the sensor or sensor circuit. An orange or red lamp will flash and engine power will be cut depending on the specific fault code. The circuit description explains that the combined sensor measures both pressure and temperature, and requires operating voltage from the engine control unit to function properly.

Uploaded by

user1
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Malfunctions, MID 128 Group 30: Electrical system

MID 128, PID 106


Charge air pressure

MID 128: Engine control unit


Fault code
FMI 0: The sensor value is valid but exceeds the nor-
mal working range.
FMI 3: The voltage exceeds the normal value or is
short circuited to higher voltage.
FMI 5: The voltage is less than the normal value or is
there is an open circuit.

FMI Fault code explanation


0 Too high charge air pressure
3, 5 Faulty sensor / Faulty sensor circuit

Fault indication
FMI 0: A red lamp flashes in the alarm panel.
Audible warning.
FMI 3, 5: An orange lamp flashes in the alarm panel.
The charge air pressure gauge shows 0.
The display shows – – –.

Symptom
FMI 0: Engine power is cut.
FMI 3, 5: Engine power is cut.

Connector A
(black) Circuit description
The sensor, which measures charge air pressure is a
combined sensor, which means that it also measures
charge air temperature. The sensor is an active sen-
sor, i.e. the sensor must have operating voltage.
The engine control unit, pin 7, supplies the sensor, pin
1 with +5 Volt. The sensor, pin 4, is connected to bat-
tery negative via the engine control unit, pin 11.
The output signal from the pressure sensor (pin 2 on
sensor to pin 22 on the engine control unit) is a volt-
age signal which is proportional to the pressure mea-
sured by the sensor.

56

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