Textron Motors 408014, Diagnostic Manual

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33 DHB MPE850 MAR Rev B | 408014 | 408090 | 408101 | 408246 |
5 Troubleshooting with trouble codes
5.2 Description of trouble codes
Trouble code
Displayed fault
Trouble code description
Possible consequences
Affected part/system
►
Possible consequences/remedy
P0643 Sensor Reference Voltage "A" Circuit High
Short circuit to plus at 5 V power supply from
engine control unit. Affected connections 32-
pol C4, E4, B4.
The power supply is outside from 5 V +/-1 V.
5 V power supply from engine control unit
► Check the connected parts and wiring.
(See the vehicle manufacturer‘s
documentation.)
► Replace the engine control unit. (See the
repair manual.)
P0651 Sensor Reference Voltage "B" Circuit/Open
Open circuit at 5 V power supply from engine
control unit. Affected connections 64-pol E1,
F1, G1, H1, J1.
The power supply is outside from 5 V +/-1 V.
5 V power supply from engine control unit
► Check the connected parts and wiring.
(See the vehicle manufacturer‘s
documentation.)
► Replace the engine control unit. (See the
repair manual.)
P0653 Sensor Reference Voltage "B" Circuit High
Short circuit to plus at 5 V power supply from
engine control unit. Affected connections 64-
pol E1, F1, G1, H1, J1.
The power supply is outside from 5 V +/-1 V.
5 V power supply from engine control unit
► Check the connected parts and wiring.
(See the vehicle manufacturer‘s
documentation.)
► Replace the engine control unit. (See the
repair manual.)
P0658 Actuator Supply Voltage "A" Circuit Low
The battery voltage is too low.
Engine does not start or stalls.
Battery
► Check wiring in the wire harness between
ECU 64pol-P2 and relay main. (See
chapter 7 Wiring diagram.)
► Check the battery cable. (See the vehicle
manufacturer‘s documentation.)
► Recharge the battery. (See the vehicle
manufacturer‘s documentation.)
► Replace the battery. (See the vehicle
manufacturer‘s documentation.)