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P0605: ECU System (Hardware) (warning lamp flashes: 33)
P1171: Q Adjustment Resistor (Low) (warning lamp flashes: 34)
P1172: Q Adjustment Resistor (High) (warning lamp flashes: 34)
P1176: PTO Adjustment Resistor (Low) (warning lamp flashes: 62)
Generation condition
Diagnosis code is generated under either of the following conditions.
(1) Power supply circuit or power supply in electronic control unit is abnormal.
(2) Devices (analog-digital converter, IC for driving injector or timer IC) in electron-
ic control unit or CPU gate array communication are abnormal.
Recoverability
• In the case of above problem (1)
• System recovers if power supply circuit or power supply in electronic con-
trol unit becomes normal.
• In the case of above problem (2)
• System recovers (power is re-supplied to electronic control unit) if signal
becomes normal when starter switch is turned OFF → ON.
Control effected by electronic control unit
• In the case of above problem (1)
• Engine warning lamp (orange) display
• In the case of above problem (2)
• Engine warning lamp (red) display
• Engine is stopped.
Inspection Other Replace the engine electronic control unit.
Generation condition
Fuel injection rate adjustment resistor voltage remains less than 0.2 V for 3 sec-
onds.
Recoverability
System recovers when fuel injection rate adjustment resistor voltage remains 0.2
V or more for 1 second.
Control effected by electronic control unit Control is effected using backup value (No. 1). (Output is slightly reduced.)
Inspection
Service data 33: Q Adjustment Resistor No.
Electronic control unit connector : Fuel injection rate adjustment resistor
Electrical equipment #828: Fuel injection rate adjustment resistor
Electric circuit diagram Fuel injection rate adjustment resistor system
Generation condition
Fuel injection rate adjustment resistor voltage remains higher than 4.8 V for 3
seconds.
Recoverability
System recovers when fuel injection rate adjustment resistor voltage remains 4.8
V or less for 1 second.
Control effected by electronic control unit Control is effected using backup value (No. 1). (Output is slightly reduced.)
Inspection
Service data 33: Q Adjustment Resistor No.
Electronic control unit connector : Fuel injection rate adjustment resistor
Electrical equipment #828: Fuel injection rate adjustment resistor
Electric circuit diagram Fuel injection rate adjustment resistor system
Generation condition
Power take-off resistor voltage remains less than 0.2 V for 3 seconds when gov-
ernor control switch is ON.
Recoverability
System recovers when power take-off resistor voltage remains 0.2 V or more for
1 second when governor control switch is ON.
Control effected by electronic control unit Control is effected using backup value (not resistor).
Inspection
Service data 36: PTO Adjustment Resistor No.
Electronic control unit connector : Power take-off resistor
Electrical equipment #828: Power take-off resistor
Electric circuit diagram Power take-off resistor system
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