Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
1627-05 Fuel Pump Relay
Test Step 1. Verify Diagnostic Code
Current Below Normal -
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.
2. Verify diagnostic code 1627-05 is
Diagnostic Code 1627-05 Active -
Proceed to Test Step 2.
Test Step 2. Test Relay Control Cir-
1. Turn the ignition switch to the
2. Disconnect harness connector
fuel prime pump relay.
3. Turn ignition switch to the ON
N OT E
Do not disable fuel pump override; fuel pump override may turn off after
4. Perform Fuel Pump Command
Override (WP 0035) to force fuel
pump relay On.
Voltage OK (18-24 Volts) - Replace
sure voltage supply circuit 150-
fuel pump relay (Fuel Transfer Pump,
RD for voltage between fuel prime
Test Step 4, WP 0035).
pump relay harness connector
Voltage NOT OK - Proceed to Test
Terminal 5 and 2 ground.
Voltage should be within 18 - 24 Volts.