Scania fault code 804
Code 804 is used by 7 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Propulsion battery level monitor T181 is defective
The level monitor for the propulsion battery cooling system is defective. Discovered through the response from the level monitor.
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COO Coordinator
Voltage supply, short circuit to earth
Short circuit in voltage supply travelling via relay 19.
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MBS
Refrigerant system passenger area, pressure too high
The high pressure sensor for the climate system reports too high a pressure.
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DDU
Missing CAN-messages from AMP
No CAN message recieved from the external amplifier (AMP1) . Only stored when ignition is ON.
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CMS
Solenoid valve for differential lock, 2nd rear axle
The solenoid valve (V1005) controlling the differential lock for the second rear axle, connected on PWM output 4 (Pin: signal A16, earth A18) is either not connected or is short-ci…
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ALM
Interrupted electric power supply
Unexpected interruption in the electric power supply while the alarm system was activated.
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DCU
Micro switch front door leaf, door lock, open circuit
The measured voltage on the input pin, 3-phase input, to the door control unit indicates an open circuit. This occurs when the measured voltage is approx. 8 – 16 V and the supply v…
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