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Page Title:
Test Step 6. Insert a Jumper at the Service Brake Pedal Position (Switch 1) |
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 384
TM 9-2320-312-24-2
Troubleshooting Section
Test Step 6. Insert a Jumper at the
E. Install the jumper into terminal 45 Service Brake
Service Brake Pedal Position (Switch 1).
Pedal Position Switch 1 of the Breakout T.
Connect the other end of the jumper to ECM
Table 192
Connector P1 terminal 5 (AP sensor/switch
sensor common) of the Breakout T.
Table for Status of the Service Brake Pedal
Position (Switch 1)
F. Turn the ignition key switch to the ON position.
Condition of Switch
Switch Status
Circuit
Circuit
G. Connect an electronic service tool to the cab
data link connector.
Service Brake Pedal
ON
Open
Position Switch 1 Wires
H. Access the electronic service tool status screen.
are Disconnected.
Service Brake Pedal
I. While the status of the Service Brake Pedal
OFF
Shorted
Position Switch 1 Wires
Position (Switch 1) is being monitored on
Connected.
the electronic service tool status screen
slowly remove the jumper from terminal 5 and
A. Turn the ignition key switch to the OFF position.
slowly insert the jumper from terminal 5 (AP
sensor/switch sensor common).
B. Ensure that ECM vehicle harness connector
J1/P1 is connected.
Refer to Table 191.
C. Find the switch for the Service Brake Pedal
Expected Result:
Position (Switch 1) in the vehicle.
The switch status changes per the information in
D. Disconnect the wires from the switch terminals.
Table 191.
E. Turn the ignition key switch to the ON position.
Results:
F. Connect the electronic service tool to the cab
Yes The ECM is functioning properly. Proceed
data link connector.
to Test Step 6.
G. Access the electronic service tool status screen.
No The ECM is NOT functioning properly.
H. While the switch status is being monitored on
Repair: Perform the following repair:
the electronic service tool status screen slowly
connect the switch wires and slowly disconnect
1. Temporarily connect a test ECM.
the switch wires.
Refer to Table 192.
3. Recheck the system for active diagnostic
Expected Result:
codes.
The switch status changes per the information in
4. Repeat the test step.
Table 192.
5. If the problem is resolved with the test ECM,
Results:
reconnect the suspect ECM.
Yes
6. If the problem returns with the suspect ECM,
replace the ECM.
Repair: Perform the following repair:
7. Verify that the repair eliminates the problem.
Replace the faulty switch.
STOP.
Verify that the repair eliminates the problem.
STOP.
No There is a problem in the harness between
the switch and the ECM. Proceed to Test Step 7.
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