Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
0262-04 5 Volt Sensor DC
Supply Voltage Below Nor-
A warning will display on instrument
panel. Diagnostic code will not be
ECM sets all engine pressure
sensors and engine tempera-
ture sensors to default values.
· ECM will derate engine.
Possible Performance Effect:
Low power, engine will be de-rated.
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
997-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.
Test Step 1. Test for Bad Sensor.
N OT E
Always inspect the harness connectorsthat are involved in the circuit.
Poor connections can often be the cause of a problem in an electrical
circuit. Verify that all connections in the circuit are clean and secure,
and that all connections are in good condition. If a problem with a
connection is found, correct the problem and verify that this diagnostic
code is active before performing this procedure.
Perform open or short circuit test ateach harness connection to identify
correct harness to replace.
Perform this test only if condition is active.
Engine ECM C6.6 120M and ver-
ify 0262-04 is active.