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P1256: Common Rail Pressure M/V 1 (warning lamp flashes: 63)
P1258: Common Rail Pressure M/V 2 (warning lamp flashes: 63)
Generation condition
Diagnosis code is generated under either of the following conditions.
(1) MPROP1 (rail pressure control valve) circuit shorted to battery (high level
when turned ON) as detected for 0.3 second.
(2) MPROP1 (rail pressure control valve) driving voltage remains abnormal for 1
second.
Recoverability
• In the case of above problem (1)
• System recovers (power is re-supplied to electronic control unit) if signal
becomes normal when starter switch is turned OFF (2 minutes or more) →
ON.
• In the case of above problem (2)
• MPROP1 (rail pressure control valve) driving voltage remains normal for 1
second.
Control effected by electronic control unit
• In the case of above problem (1)
• Injection quantity is limited. (Output is reduced, and exhaust emissions
worsen.)
• Exhaust gas recirculation control is stopped.
• Auto cruise control is stopped.
• In the case of above problem (2)
• No specific control is effected.
Inspection
Actuator test B9: Fuel Leak Check
Electronic control unit connector : MPROP1 (rail pressure control valve)
Electrical equipment #574: MPROP1 (rail pressure control valve)
Electric circuit diagram MPROP1 (rail pressure control valve) system
Generation condition
Diagnosis code is generated under either of the following conditions.
(1) MPROP2 (rail pressure control valve) circuit shorted to battery (high level
when turned ON) as detected for 0.3 second.
(2) MPROP2 (rail pressure control valve) driving voltage remains abnormal for 1
second.
Recoverability
• In the case of above problem (1)
• System recovers (power is re-supplied to electronic control unit) if signal
becomes normal when starter switch is turned OFF (2 minutes or more) →
ON.
• In the case of above problem (2)
• MPROP2 (rail pressure control valve) driving voltage remains normal for 1
second.
Control effected by electronic control unit
• In the case of above problem (1)
• Injection quantity is limited. (Output is reduced, and exhaust emissions
worsen.)
• Exhaust gas recirculation control is stopped.
• Auto cruise control is stopped.
• In the case of above problem (2)
• No specific control is effected.
Inspection
Actuator test B9: Fuel Leak Check
Electronic control unit connector : MPROP2 (rail pressure control valve)
Electrical equipment #574: MPROP2 (rail pressure control valve)
Electric circuit diagram MPROP2 (rail pressure control valve) system
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