HOW TO READ THIS MANUAL How to Use Diagnostic Codes The contents of this manual include functions and parts that are not used in your truck depending on the truck specifications. Please refer to the chassis service manual for the details. 00-6 TROUBLESHOOTING 1. Diagnostic Procedure This section suggests areas to 2. Diagnostic Precautions inspect for each diagnostic 3. Inspections Based On Diagnostic Codes code. 4. Multi-use Tester Service Data 5. Actuator Tests Performed Using Multi-use Tester 6. Inspections Performed At Electronic Control Unit Connectors There are the diagnostic code and message displayed on Multi-Use Tester.
Numerical values in parenthesis are added only when a diagnostic code indicated in the Multi-Use Tester display differs from the code indicated by the number of warning lamp flashes. P125A: Common Rail Pressure M/V1 (high) (warning lamp flashes: 63) Code generation criteria MPROP1 (rail pressure control valve) voltage is above standard valve. System recovers (power is re-supplied to electronic control unit) if signal Resetability becomes normal when starter switch is turned OFF → ON. • Engine is stopped. Electronic control unit control • Exhaust gas recirculation control is stopped. Service data 0C: Difference Common Rail Pressure In- Actuator test B9:
Fuel Leak Check spec- tion Electronic control unit 08 : Resistance of MPROP (rail pressure control valve) item connector Electrical part #574: MPROP1 (rail pressure control valve) Refer to “Inspection of Electrical Equipment.” TROUBLESHOOTING 1. Diagnostic Procedure 2. Diagnostic Precautions 3. Inspections Based On Diagnostic Codes 4. Multi-use Tester Service Data 5. Actuator Tests Performed Using Multi-use Tester 6. Inspections Performed At Electronic Control Unit Connectors Refer to “Inspection of Electrical Equipment.” Code generation criteria MPROP1 (rail pressure control valve) voltage is above standard valve.
Resetability System recovers (power is re-supplied to electronic control unit) if signal becomes normal when starter switch is turned OFF → ON. Electronic control unit control • Engine is stopped. • Exhaust gas recirculation control is stopped. In- spec- tion item Service data 0C: Difference Common Rail Pressure Actuator test B9: Fuel Leak Check Electronic control unit connector 08 : Resistance of MPROP (rail pressure control valve) Electrical part #574: MPROP1 (rail pressure control valve)