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
0549-02 Throttle Lock
14.
Using a digital multimeter, test for
Continuity - ECM faulty, replace
Switch Data Erratic, Intermit-
continuity between the harness
Engine ECM (WP 0067).
tent, or Incorrect - Contin-
connector FA-C17 (WP 0009, Fig-
Connect connector R-C1 (WP 0009,
ued
ure 14) terminal 50 and ground.
Figure 33) to connector P-C3 (WP
There should be continuity.
0009, Figure 34).
Connect harness connector A-C9
(WP 0009, Figure 30) to throttle hold
mode switch.
No Continuity - Rear chassis wiring
harness is open, replace rear chassis
wiring harness (WP 0189).
Connect connector R-C1 (WP 0009,
Figure 33) to connector P-C3 (WP
0009, Figure 34).
Connect harness connector A-C9
(WP 0009, Figure 30) to throttle hold
mode switch.
System Response:
1589-03 Turbocharger Inlet
Air Pressure Sensor Volt-
ECM defaults to an air inlet
age Above Normal Code
restriction of 2.0 psi (14 kPa).
Engine derates by 10%.
A warning will appear on display
on instrument panel. ECM will log
diagnostic code.
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.
Out put 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 turbocharger air inlet pressure sensor signal circuit is an input to
the Engine ECM at Engine ECM J1-55 circuit F713-OR.
0011-141
Change 1
