P1223/3: Failure B With Rack Actuator Relay - Yanmar 3TNV82A Troubleshooting Manual

FAILURE DIAGNOSIS

(2) P1223/3: Failure B with Rack Actuator Relay

DTC P1223/3
DTC Detecting Conditions
1 - Precondition; 2 - Detecting condition(s); 3 - Flashing pattern of failure indicator
1. Key switch ON.
2. Make an assessment logically as to followings.E-ECU detects the rack actuator
relay turning OFF during the command to turn ON the rack actuator relay.
3. One flash followed by seven flashes.
Movement at Error occurrence
Error Mode [Stop Immediately]: The engine stops running.
Run restricted? Yes: The rack actuator relay is turned OFF, and the rack position is forcibly set to the
Recovery No.
Conditions
Remarks
Estimation of Failure cause/Error condition
• Wiring defect of the harness
The rack actuator relay wiring may be short-circuited with POWER SUPPLY (*NOTE).
•
• The rack actuator relay may be faulty.
Inner wiring short-circuited with POWER SUPPLY (*NOTE).
•
*NOTE) If the rack actuator relay wire is short-circuited with POWER SUPPLY, inner circuit of E-ECU may fail
before the E-ECU's power supply line fuse 10A is blown.In this case, the ECU fails to detect/indicate
the error, and to store the error history.
• The E-ECU internal circuitry may be faulty.
1-68
DTCs (Diagnostic Trouble Codes) General Description
engine stop position.
Failure B with Rack Actuator Relay
TNV DI Service Manual
Check points
Connector
Harness
Rack actuator Relay
E-ECU