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
1785-04 Intake Manifold
9. Disconnect engine ECM harness
Pressure Sensor Voltage
connector EA-C1 (WP 0009, Fig-
Below Normal - Continued
ure 3) from engine ECM J2.
10. Using a digital multimeter, test for
Continuity - Engine control wiring
continuity between at Engine
harness is shorted, replace engine
ECM harness connector EA-C1
control wiring harness (WP 0080).
(WP 0009, Figure 3) terminal 55,
No Continuity - Proceed to step 11.
and all other terminals, and
ground.
There should be no continuity.
11. Using a digital multimeter, test for
Continuity - (Resistance should be
continuity between engine ECM
less than 5.0 Ohms) - Engine ECM
harness connector EA-C1 (WP
faulty, replace Engine ECM (WP
0009, Figure 3) terminal 55 and
0067).
intake manifold pressure sensor
Connect the EA-C7 (WP 0009, Figure
harness connector EA-C7 (WP
24) harness connector to intake mani-
0009, Figure 24) terminal 3.
fold pressure sensor.
There should be good continuity.
No Continuity - Engine control wiring
harness is open, replace engine con-
trol wiring harness (WP 0080).
Test Step 2. Test 5-Volt Circuit.
1. Turn the ignition switch and
battery disconnect switch to the
OFF position.
2. Install a jumper wire between
intake manifold pressure sensor
harness connector EA-C7 (WP
0009, Figure 24) terminal 1 and
terminal 2.
3. Disconnect harness connector
EA-C1 (WP 0009, Figure 3) from
Engine ECM J2.
4. Using a digital multimeter, test for
Continuity - (Resistance should be
continuity between ECM harness
less than 5.0 Ohms) - 5-Volt supply
connector EA-C1 (WP 0009, Fig-
circuit tests OK. Engine ECM faulty,
ure 3) terminal 46 and terminal
replace Engine ECM (WP 0067).
38.
Connect the EA-C7 (WP 0009, Figure
24) harness connector to intake mani-
There should be good continuity.
fold pressure sensor.
No Continuity - Engine control wiring
harness is open, replace engine con-
trol wiring harness (WP 0080).
Change 1
