Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
9. Install a jumper wire between
Pressure Sensor Abnormal
intake manifold pressure sensor
Rate of Change - Continued
harness connector EA-C7 (WP
0009, Figure 24) terminal 2 and
continuity between engine ECM
harness is good, replace intake
harness connector EA-C1 (WP
manifold pressure sensor (WP 0107).
0009, Figure 3) terminal 38, and
Connect harness connector EA-C1
harness is open, replace engine con-
trol wiring harness (WP 0080).
1797-03 Fuel Rail Pressure
Sensor Voltage Above Nor-
A warning will appear on display on
instrument panel. ECM will log diag-
nostic code. Electronic service tool
will display Voltage Above Normal
next to Desired Fuel Rail Pressure
and Actual Fuel Rail Pressure on sta-
Possible Performance Effect:
Engine will be derated.
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 fuel rail pressure sensor signal circuit is an input to the Engine
ECM at Engine ECM J2-51 circuit Y946-BU.