COUPLING-STRAIGHT 7X1463 - Caterpillar

Table 6
Status of Parking Brake Pressure Switch    
Parking Brake Pressure Switch    Terminal B
(N/O)
Wire G756-YL
J2-53    Terminal C
(N/C)
C491-PU
J2-52    
Low Pressure
Parking Brake Engaged     Open     Closed    
High Pressure
Parking Brake Engaged     Closed     Open    
Table 7
Troubleshooting Test Steps    Values    Results    
1. Identify Active FMI Code Associated With Sensor Circuit    
Code present.     FMI 3 diagnostic code, proceed to Test Step 2.
FMI 4 diagnostic code, proceed to Test Step 7.    
Begin Process For FMI 3 Troubleshooting HERE    
2. Check the Harness For an Open
A. Turn key start switch and disconnect switch OFF.
B. Disconnect the switch from the machine harness.
C. Disconnect the J1 and J2 machine harness connector.
D. At the machine harness connector for the switch, place a jumper wire between the signal contact and frame ground.
E. At the machine harness connect for the ECM, measure the resistance between the signal contact and frame ground.    
The resistance is less than 5 Ω.     OK - The circuit is correct.
Proceed to Test Step 3.
NOT OK - The resistance is greater than 5K Ω. The circuit is open.
Repair: Repair or replace the machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω indicates a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in