P1203/3: Failure With Rack Position Sensor (High Voltage) - Yanmar 3TNV82A Troubleshooting Manual

FAILURE DIAGNOSIS

(2) P1203/3: Failure with Rack Position Sensor (High Voltage)

DTC P1202/3
DTC Detecting Conditions
1 - Precondition; 2 - Detecting condition(s);
3 - Flashing pattern of failure indicator
1. Key switch ON.
2. The sensor voltage upper limit and above [at E-ECU activation,
engine running]
3. Seven flashes.
Movement at Error occurrence
Error Mode [Run Under Restrictions]:
Start the engine in on-error engine control
mode.
It takes 1 to 10 seconds from the starter's
rotation to the engine start.
Run restricted? Yes: • The High idle is restricted to one of
Recovery No.
Conditions
Remarks The High and Low idle speeds must be
equal to those specified in the engine
specifications.
Estimation of Failure cause/Error condition
• The connector may not be properly connected.
• Wiring defect of the harness
The SENSOR GND wire may be disconnected.
•
The rack position sensor signal wire may be short-circuited with POWER SUPPLY.
•
The rack actuator wiring may be short-circuited with GND (with engine running).
•
• The rack position sensor may be faulty.
Output defect of the rack position signal by a disconnection or a short circuit of the inner wiring
•
• The rack actuator may be faulty.
The rack actuator inner wiring may be short-circuited with GND (with engine running).
•
• The E-ECU internal circuitry may be faulty.
1-10
DTCs (Diagnostic Trouble Codes) General Description
Detection at the engine start
the following, whichever smaller:
80% of the pre-error High idle speed
•
150% of the Low idle speed
•
• The fuel injection rate is restricted.
Failure with Rack Position Sensor (High Voltage)
Connector
Harness rack position sensor
Rack actuator
E-ECU
Detection at the engine running
[Stop Immediately]:
The engine stops running.
Yes: The rack actuator relay is turned
OFF, and the rack position is forcibly
set to the engine stop position.
No.
TNV DI Service Manual
Check points