Mitsubishi Fuso CANTER FE85DE6SLGP, Shop Manual

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13E-42
P0687: EDU Relay (High) (warning lamp flashes: 84)
P0698: Sensor Supply Voltage 3 (Low) (warning lamp flashes: 81)
P0699: Sensor Supply Voltage 3 (High) (warning lamp flashes: 81)
P1171: Q Adjustment Resistor (Low) (warning lamp flashes: 34)
Generation condition Electronic drive unit relay circuit shorted to power source.
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
• Injection quantity is limited.
• Turbocharger target opening value is replaced by a backup value.
• Exhaust gas recirculation control is stopped.
• Throttle control is stopped.
Possible causes
• Open-circuited or short-circuited harness between engine electronic control
unit and electronic drive unit relay
• Malfunction of each connector
• Malfunction of electronic drive unit relay
• Malfunction of engine electronic control unit
Generation condition
Engine electronic control unit internal voltage (sensor supply voltage 3) 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 Effects no special control.
Possible causes
• Open-circuited or short-circuited harness between engine electronic control
unit and common rail pressure sensor
• Open-circuited or short-circuited harness between engine electronic control
unit and diesel particulate filter pressure sensor
• Open-circuited or short-circuited harness between engine electronic control
unit and intake air temperature sensor 2
• Malfunction of each connector
• Malfunction of common rail pressure sensor
• Malfunction of diesel particulate filter differential pressure sensor
• Malfunction of intake air temperature sensor 2
• Malfunction of engine electronic control unit
Generation condition
Engine electronic control unit internal voltage (sensor supply voltage 3) 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 common rail pressure sensor
• Open-circuited or short-circuited harness between engine electronic control
unit and diesel particulate filter pressure sensor
• Open-circuited or short-circuited harness between engine electronic control
unit and intake air temperature sensor 2
• Malfunction of each connector
• Malfunction of common rail pressure sensor
• Malfunction of diesel particulate filter differential pressure sensor
• Malfunction of intake air temperature sensor 2
• Malfunction of engine electronic control unit
Generation condition Voltage of fuel injection rate adjustment resistor is too low (below 0.2 V).
Recoverability
System recovers if any valid signal is input when starter switch is turned from
OFF to ON (the warning lamp does not extinguish unless 3 consecutive valid sig-
nals are input).
Control effected by electronic control unit Control is made using a backup value (No. 1).
Possible causes
• Open-circuited or short-circuited harness between engine electronic control
unit and fuel injection rate adjustment resistor
• Malfunction of each connector
• Malfunction of fuel injection rate adjustment resistor
• Malfunction of engine electronic control unit
TROUBLESHOOTING