Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
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1627-06 Fuel Pump Relay
Current Above Normal -
Battery voltage is provided from the 20 amp Trans Control Breaker. The
battery voltage supply circuit 150-RD is spliced and supplied to the
Engine ECM harness connector FA-C17 terminal 7
Engine ECM harness connector FA-C17 terminal 8
Engine ECM harness connector FA-C17 terminal 15
Engine ECM harness connector FA-C17 terminal 16
Fuel prime pump relay harness connector FE-C4 terminal 1
Fuel prime pump relay harness connector FE-C4 terminal 5
The Engine ECM uses the fuel prime pump relay control circuit 365-YL
at Engine ECM harness connector FA-C17 terminal 64 and controls the
fuel prime pump relay at fuel prime pump relay harness connector FE-
C4. The fuel prime pump relay provides voltage from the relay harness
connector FE-C4 terminal 4 to the fuel prime pump supply circuit A893-
OR at the fuel prime pump harness connector FE-C5 terminal 1. The
ground circuit 220-BK for the fuel prime pump is provided between the
fuel prime pump harness connector FE-C5 terminal 2 and frame
At ignition on, the Engine ECM willactivate the fuel prime pump relay
for up to 3 minutes. The Engine ECM only monitors the fuel prime pump
relay control circuit.
Test Step 1. Verify Diagnostic Code
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.
Perform Fuel Pump Relay Command
Diagnostic Code 1627-06 Active -
Override (WP 0035) and verify diag-
Proceed to Test Step 2.
nostic code 1627-06 is active.
Test Step 2. Test Relay Control Cir-
1. Turn the ignition switch to the