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
0091 08 Throttle Position
System Response:
Sensor Abnormal Fre-
Limp home mode is activated.
quency, Pulse Width, or
Possible Performance Effect:
Period
Engine will remain at low idle
while diagnostic code is active.
Throttle inputs are ignored by
ECM until fault is repaired.
Throttle inputs will also be ignored
by ECM until keyswitch has been
turned to OFF position and back
to ON position.
N OT E
The 8-Volt supply circuit is a common supply circuit which is bussed
internally of the Engine ECM. Out put of the 8-Volt supply circuit is at
Engine ECM J1-43 and J2-10. The 8-Volt supply circuit 996-GN is
spliced externally of the Engine ECM from J2-10 and is supplied to the
engine speed sensor and the secondary engine (Cam) speed sensor
(on the fuel injection pump). The 8-Volt supply circuit J844-GY is sup-
plied to the throttle position sensor from the Engine ECM from J1-43.
Test Step 1. Test 8-Volt Supply and
Signal.
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.
1. Connect MSD (WP 0006). Select
Engine ECM C6.6 120M and ver-
ify 0091-08 is active.
2. Turn ignition switch to the OFF
position.
3. Remove pedal assembly cover
(WP 0288).
4. Disconnect P-C23 (WP 0009, Fig-
ure 13) harness connector from
the throttle position sensor.
5. Turn ignition switch to the ON
position.
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