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
1785-10 Intake Manifold
Test Step 1. Test 5-Volt and Signal
Pressure Sensor Abnormal
Circuit.
Rate of Change - Continued
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
Diagnostic code 1785-10 Active -
Engine ECM C6.6 120M.
Proceed to step 3.
2. Start and run the engine and ver-
ify 1785-10 is active.
3. Turn ignition switch to the OFF
position.
4. Disconnect the intake manifold
pressure sensor EA-C7 (WP
0009, Figure 24) harness connec-
tor.
5. Install a jumper wire between
intake manifold pressure sensor
EA-C7 (WP 0009, Figure 24) har-
ness connector terminal 1, and
terminal 3.
6. Disconnect harness connector
EA-C1 (WP 0009, Figure 3) from
Engine ECM J2.
7. Using a digital multimeter, test for
No Continuity - Engine control wiring
continuity between engine ECM
harness is open, replace engine
harness connector EA-C1 (WP
control wiring harness (WP 0080).
0009, Figure 3) terminal 46, and
Continuity - (Resistance should be
terminal 55.
less than 5.0 Ohms) - Proceed to step
8.
8. Remove jumper wire from intake
manifold pressure sensor EA-C7
(WP 0009, Figure 24) harness
connector terminal 1 and terminal
3.
Change 1