BRACKET 2N7152 - Caterpillar

Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the DTC is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.
FMI 3 DTC, proceed to Table 2.
FMI 4 DTC, proceed to Table 3.
Table 2
FMI 3 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Voltage At The Sensor
A. Turn key switch and disconnect switch ON.
B. Refer to the schematic to determine the voltage source for the sensor.
C. At the machine harness connector for the sensor, insert 7X-1710 multimeter probes along the sensor supply voltage and sensor ground.
D. At the sensor harness connector, measure voltage between the sensor supply voltage and sensor ground.
Voltage reading is correct for the sensor. OK - The voltage reading is correct for the sensor.
Proceed to Test Step 2.
NOT OK - The voltage is not correct for the circuit.
Repair: There is a problem with the machine harness. Repair or replace the machine harness.
Proceed to Test Step 4.
2. Check The Harness For An Open
A. Turn the key switch and the disconnect switch to the OFF position.
B. Disconnect the machine harness connector from the sensor.
C. At the sensor harness connector, install a jumper wire between the sensor ground contact and signal contact.
D. Turn the key switch and disconnect switch ON.
E. Observe the status of the DTC.
The DTC changes from an FMI 3 to an FMI 4. OK – The DTC changes from an FMI 3 to an FMI 4. The sensor has failed.
Repair: Replace the sensor.
Proceed to Test Step 4.
NOT OK – The DTC does not change from an FMI 3 to an FMI 4.
Proceed to Test Step 3.
3. Check Signal Circuit For A Short To +Battery
A. Turn the key switch and the disconnect switch to the OFF position.
B. Disconnect the ECM harness connectors. The sensor harness connector remains disconnected.
C. Remove the jumper wire that was installed in the previous test step.
D. At the ECM harness connector, measure the resistance between the signal contact and all other contacts used in the ECM harness connectors.
Each resistance is greater than 5 K Ω. OK: Each resistance is greater than 5 K Ω. The harness circuit is correct.
Proceed to Test Step 4.
NOT OK: The resistance is less than 5 Ω. A short exists in the harness between the signal circuit and the circuit with the low resistance measurement.
Repair: Repair or replace the machine harness.
Proceed to Test Step 4.
4. Check If The DTC Remains
A. Reconnect all harness connectors. Return machine to normal operating condition.
B. Turn the key switch and the disconnect switch ON.
C. Clear all DTCs.
D. Operate the machine.
E. Stop the machine and engage the parking brake.
F. Check if the DTC