TUBE AS 1W6012 - Caterpillar

Table 1
Table for Status of the Service Brake Pedal Position    
Switch Position or Pedal Position    Status    Circuit    
The service brake pedal is depressed.     OFF     Open    
The service brake pedal is released.     ON     Closed    
Access the Cat ET status screen.
Turn the ignition key switch to the ON position.
Depress the service brake while the status of the service brake pedal position (switch 1) is being observed. Also, release the service brake while the status of the service brake pedal position (switch 1) is being observed.Refer to Table 1 for the status of the switch or for the status of the pedal position.Expected Result:The switch status changes per the information in Table 1.Results:
Yes - The switch is operating normally.STOP
No - The ECM is not reading the switch status change. Proceed to Test Step 3.Test Step 3. Check the Switch Circuit
Table 2
Table for Status of Service Brake Pedal Position (Switch 1)    
Condition of Switch Circuit    Switch Status    Circuit    
Terminal 45 is open.     ON     Open    
Terminal 45 connected to terminal 5.     OFF     Shorted    
Turn the ignition key switch to the OFF/RESET position.
Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch Pin to both ends of the wires.
Disconnect vehicle harness connector P1 from the ECM.
Connect a breakout T to ECM connector J1 and connect P1 to the breakout T.
Install the jumper into terminal 45 (Service Brake Pedal Position Switch 1) of the breakout T. Connect the other end of the jumper to P1-5 (AP sensor/switch sensor common) of the breakout T.
Turn the ignition key switch to the ON position.
Verify that Cat ET is connected to the cab data link connector.
Access the Cat ET status screen.
While the status of the service brake pedal position (switch 1) is being monitored on the Cat ET status screen slowly remove the jumper from terminal 5 and slowly insert the jumper from terminal 5 (AP sensor/switch sensor common).Refer to Table 2.Expected Result:The switch status changes per the information in Table 2.Results:
Yes - The ECM is functioning properly. Proceed to Test Step 4.
No - The ECM is not functioning properly.Repair: Perform the following repair:
Temporarily connect a test ECM.
Remove all jumpers and replace all connectors.
Recheck the system for active diagnostic codes.
Repeat the test step.
If the problem is resolved with the test ECM, reconnect the suspect ECM.
If the problem returns with the suspect ECM, replace the ECM.
Verify that the repair eliminates the problem.STOPTest Step 4. Insert a Jumper at the Service Brake Pedal Position (Switch 1)
Table 3
Table for Status of the Service Brake Pedal Position (Switch 1)    
Condition of Switch Circuit    Switch Status    Circuit    
The wires for the service brake pedal position switch 1 are disconnected.     ON     Open    
The wires for the service brake pedal position switch 1 are connected.     OFF     Shorted    
Turn the ignition key switch to the OFF/RESET position.
Ensure that ECM vehicle harness connector J1/P1 is connected.
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