P0122/4: Accelerator Sensor Error (Low Voltage) - Yanmar 3TNV82A Troubleshooting Manual

FAILURE DIAGNOSIS
Accelerator sensor

(1) P0122/4: Accelerator Sensor Error (Low Voltage)

DTC P0122/4
DTC Detecting Conditions
1 - Precondition; 2 - Detecting condition(s);
3 - Flashing pattern of failure indicator
1. Key switch ON.
2. Sensor voltage 0.2 [V] or lower.
3. Five flashes.
Movement at Error occurrence
Error Mode [Run Under Restrictions]:
The engine runs at a constant rotational
speed.
Run restricted? Yes: The target speed is set to the "on-
Recovery Yes: This error will be automatically reset
Conditions
Remarks
Estimation of Failure cause/Error condition
• The connector may not be properly connected.
• Wiring defect of the harness
The accelerator sensor's signal wires may be disconnected or short-circuited with GND.
•
The SENSOR 5V wire may be disconnected or short-circuited with GND.
•
The SENSOR GND wire may be short-circuited with POWER SUPPLY (*NOTE).
•
*NOTE) If the SENSOR GND wire is short-circuited with POWER SUPPLY, the E-ECU's power supply line fuse
10A might be blown.With this fuse blown, the E-ECU may fail to detect/indicate the error, and to store
the error history.
• The accelerator sensor may be faulty.
Sensor output defect by a disconnection of the accelerator sensor inner wiring or a sliding resistance
•
increase
• The E-ECU internal circuitry may be faulty.
1-12
DTCs (Diagnostic Trouble Codes) General Description
Spare Accelerator Sensor Function
Unavailable
error target speed (standard value:
-1
1500[min ])" or "pre-error target
speed".
when a normal voltage (0.2 to
4.6[V]) is input.
Accelerator Sensor Error (Low Voltage)
Harness
Accelerator sensor
[Stop Immediately]:
The engine continues to run using the
spare accelerator sensor instead.
No.
Yes: This error will be automatically reset
when a normal voltage (0.2 to
4.6[V]) is input.
TNV DI Service Manual
Check points
Available