TM 5-3805-293-23-1
0011
Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
ERROR/EVENT
CORRECTIVE ACTION
1785-03 Intake Manifold
System Response:
Pressure Sensor Voltage
A warning will appear on display
Above Normal
on instrument panel. ECM will log
diagnostic code. Data for intake
manifold pressure will be set to a
maximum valid pressure for two
seconds. ECM will flag intake
manifold pressure as being
invalid. A default value is used for
intake manifold pressure.
Current for waste gate solenoid
will be set to a default value while
this code is active. This will cause
engine to have poor acceleration
but default setting will prevent any
overpressure in intake manifold
which could be caused by an
overspeed of turbocharger.
Possible Performance Effect:
None.
N OT E
The 5-Volt supply circuit is a common supply circuit which is bussed
internally of 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 J2-55 circuit X731-BU
Change 1
0011-158
