00-6
How to Use Diagnostic Codes <Electronically Controlled Fuel System (Gr13E)>
P125A: Common Rail Pressure M/V1 (high) (warning lamp flashes: 63)
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
: Resistance of MPROP (rail pressure control valve)
Electrical part #574: MPROP1 (rail pressure control valve)
08
This section suggests areas to
inspect for each diagnostic
code.
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
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.
Refer to “Inspection of Electrical
Equipment.”
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.
HOW TO READ THIS MANUAL
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