Sensor 5V; P0642/4: Failure With Sensor 5V (Low Voltage) - Yanmar 3TNV82A Troubleshooting Manual

DTCs (Diagnostic Trouble Codes) General Description

SENSOR 5V

(1) P0642/4: Failure with SENSOR 5V (Low Voltage)

DTC P0642/4
DTC Detecting Conditions
1 - Precondition; 2 - Detecting condition(s); 3 - Flashing pattern of failure indicator
1. Key switch ON.
2. SENSOR 5V monitoring voltage 4.5 [V] or lower.
3. Two flashes followed by four flashes.
Movement at Error occurrence
Error Mode [Operation Continuation]: After detecting the error, the system lets the engine
continue to run without any restrictions.
Run restricted? No.
Recovery No.
Conditions
Remarks
Estimation of Failure cause/Error condition
• Wiring defect of the harness
The SENSOR 5V wire may be short-circuited with GND.
•
• The E-ECU internal circuitry may be faulty.
Diagnosis Description
1) Initial diagnosis
with the diagnosis
tool
2) Check of
connectors/wiring
3) Failure Diagnostic
Work
TNV DI Service Manual
• Check the fault indication.
• Check the voltage of the Sensor 5V .
*For details of the method and the procedure of diagnosis, see P.1-160
• Before beginning your work, be sure to turn off the key switch.
• Check that the insulation of the Sensor 5V is not peeled.
• Check the harness for correct continuity.
• Check the output voltage of the E-ECU (voltage of the sensor 5V line).
*For details of the method and the procedure of diagnosis, see P.1-160
Failure with SENSOR 5V (Low Voltage)
FAILURE DIAGNOSIS
Check points
Harness
E-ECU
1-53