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
1797-04 Fuel Rail Pressure
Test Step 1. Test Signal Circuit.
Sensor Voltage Below Nor-
N OT E
mal - Continued
·
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.
2. Start and run the engine and
Diagnostic Code 1797-04 Active -
verify diagnostic code 1797-04 is
Proceed to step 2.
active.
3. Turn ignition switch to the OFF
position.
4. Disconnect the fuel rail pressure
sensor harness connector EA-C6
(WP 0009, Figure 25).
5. Start and run the engine.
N OT E
Wait at least 30 seconds in order for diagnostic codes to become active.
1797-04 Remains Active - Proceed
6. Using MSD (WP 0006), select
to step 7.
Engine ECM C6.6 120M, and
check if diagnostic code 1797-03
1797-03 Becomes Active - Fuel rail
is active.
pressure sensor is faulty, replace fuel
rail pressure sensor (WP 0111).
7. Using a digital multimeter, check
Voltage OK (4.84 - 5.16 Volts) - 5-
5-Volt supply circuit for voltage
Volt supply circuit R997-OR and
between fuel rail pressure sensor
Engine ECM test OK, proceed to
harness connector EA-C6 (WP
step 8.
0009, Figure 25) terminal 1 and
Voltage NOT OK - Proceed to Test
ground.
Step 2.
Voltage should be within 4.84 - 5.16
Volts.
8. Turn the ignition switch and bat-
tery disconnect switch to the OFF
position.
9. Disconnect harness connector
EA-C1 (WP 0009, Figure 3) from
Engine ECM J2.
Change 1
0011-170