CABLE AS 1175061 - Caterpillar

Table 3
FMI 4 Troubleshooting
Troubleshooting Test Steps Values Results
1. Safe Shutdown Procedure
This procedure must be performed before service is performed in an area that is near any power train hazardous voltage components or conductors to ensure that the DC bus voltage has discharged properly.
Reference: Refer to "Operation and Maintenance Manual" M0070448 , Safe Shutdown Procedure in order to safely shut down the machine. The Safe Shutdown Procedure has been performed. DC voltage has been discharged to less than 50 VDC. OK -The Safe Shutdown Procedure has been performed. The monitoring system display and the hazardous voltage indicator indicate that DC voltage is less than 50 VDC. The hazardous voltage has been discharged. The power train system for the machine can now be serviced.
NOT OK: The DC voltage is greater than 50 VDC on The monitoring system display or hazardous voltage indicator is illuminated.
REPAIR: Wait for period of at least 10 minutes. Repeat the “Safe Shutdown Procedure”. If the voltage is greater than 50 VDC, voltage is still present in the system. Measure the voltage between ground and the conductors with a multi-meter. Verify that there is less than 50 VDC present between all exposed bus contacts before any other action is taken. Proceed to the next test step.
Do not make personal contact with the exposed conductors until you have manually measured for voltage between ground and the conductors.
2. Check For Active DTCs
A. Check for active DTCs that need to be resolved prior to troubleshooting this DTC. The following DTC should not be active: 3275 OK: The following DTC is not active: 3275 indicating other components that influence this component are functioning properly. Proceed to Test Step 3.
NOT OK: There is an active DTC 3275. This DTC may be the original cause of the DTC and must be repaired first.
REPAIR: Refer to the Troubleshooting material for the active DTC and repair that first. After correcting that issue, operate the machine to determine if the cause of the DTC is fixed.
3. Check The Sensor Circuit For An Open
A. Turn the key switch and the disconnect switch to the OFF position.
B. Disconnect the Control Harness from the Power Inverter.
C. Disconnect the Control Harness connector J2 from the ECM.
D. Inspect and clean all the contacts of the harness connectors. Ensure that the wires and sockets are secured in the connector and the contacts are clean and in good condition.
E. At the connector for the Power Inverter, connect a jumper wire between the phase current contact and the ECM ground contact.
F. Measure the resistance between the ECM connector and Power Inverter connector for the current phase that logged the DTC. Verify that the jumper wire is making good contact at both of the connection points.
G. Observing the multimeter resistance measurement, wiggle the harness connector for the ECM and the harness connector for the Power Inverter. Gently pull and move the wires. Do not disconnect the jumper wire. Resistance is less than 5.0 Ω OK: The resistance is less than 5.0 Ω. Proceed to Test