Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
Pressure Sensor Abnormal
A warning will appear on display
Rate of Change
on instrument panel. ECM will log
diagnostic code. ECM will flag
intake manifold pressure as being
invalid. A default value is used for
intake manifold pressure.
be set to a default value while this
code is active. This will cause
but default setting will prevent any
overpressure in intake manifold
which could be caused by an
overspeed of turbocharger.
Possible Performance Effect:
N OT E
The 5-Volt supply circuit is a common supply circuit which is bussed
inside the Engine ECM. The supply voltage is 5.0 ± 0.16 Volts. Output
of the 5-Volt supply circuit is at Engine ECM J2-46 circuit T997-OR, J2-
47 circuit L730-OR, J2-48 circuit R997-OR, and J1-42 circuit R997-OR.
The 5-Volt supply circuits are supplied to the intake manifold pressure
sensor terminal 1, the engine oil pressure sensor terminal 1, the fuel rail
pressure sensor terminal 1, and the turbocharger air inlet pressure
sensor terminal A.
Each sensor has a return or ground circuit and is a common supply
circuit which is bussed internally of the Engine ECM. The sensor return
circuit is at Engine ECM J2-40 circuit Y940-BR, J2-39 circuit Y947-BR,
J2-38 circuit T993-BR, and J1-34 circuit R993-BR.
The intake manifold pressure sensor signal circuit is an input to the
Engine ECM at Engine ECM J1-55 circuit X731-BU.