Mitsubishi Fuso CANTER FE85DE6SLGP, Shop Manual

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13E-40
P0643: Sensor Supply Voltage 1 (High) (warning lamp flashes: 81)
P0650: MIL (warning lamp flashes: 3)
P0652: Sensor Supply Voltage 2 (Low) (warning lamp flashes: 81)
Generation condition
Engine electronic control unit internal voltage (sensor supply voltage 1) is higher
than specification.
Recoverability
System recovers if any valid signal is input when starter switch is turned from
OFF to ON (the warning lamp does not go out unless 3 consecutive valid signals
are input).
Control effected by electronic control unit Effects no special control.
Possible causes
• Open-circuited or short-circuited harness between engine electronic control
unit and idling speed adjustment potentiometer
• Open-circuited or short-circuited harness between engine electronic control
unit and accelerator pedal position sensor 1
• Open-circuited or short-circuited harness between engine electronic control
unit and intake air temperature sensor 1
• Malfunction of each connector
• Malfunction of idling speed adjustment potentiometer
• Malfunction of accelerator pedal position sensor 1
• Malfunction of intake air temperature sensor 1
• Malfunction of engine electronic control unit
Generation condition Engine warning lamp (orange) circuit shorted, open-circuited, or overloaded
Recoverability System recovers if signal becomes normal with starter switch in ON position.
Control effected by electronic control unit Effects no special control.
Possible causes
• Open-circuited or short-circuited harness between engine electronic control
unit and meter cluster
• Malfunction of each connector
• Malfunction of meter cluster
• Malfunction of engine electronic control unit
Generation condition
Engine electronic control unit internal voltage (sensor supply voltage 2) is lower
than specification.
Recoverability
System recovers if any valid signal is input when starter switch is turned from
OFF to ON (the warning lamp does not go out unless 3 consecutive valid signals
are input).
Control effected by electronic control unit
• Output to sensor is stopped if voltage is lower than 3.5 V.
• Output level is lowered if voltage is higher than 3.5 V.
Possible causes
• Open-circuited or short-circuited harness between engine electronic control
unit and boost pressure sensor
• Open-circuited or short-circuited harness between engine electronic control
unit and accelerator pedal position sensor 2
• Open-circuited or short-circuited harness between engine electronic control
unit and fuel temperature sensor
• Malfunction of each connector
• Malfunction of boost pressure sensor
• Malfunction of accelerator pedal position sensor 2
• Malfunction of fuel temperature sensor
• Malfunction of engine electronic control unit
TROUBLESHOOTING