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Page Title:
Test Step 6. Insert a Jumper at the Service Brake Pedal Position (Switch 2) |
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 396
TM 9-2320-312-24-2
Troubleshooting Section
H. While the switch status is being monitored on
Results:
the electronic service tool status screen slowly
Yes The ECM is functioning properly. Proceed
connect the switch wires and slowly disconnect
the switch wires.
to Test Step 6.
No The ECM is not functioning properly.
Refer to Table 201.
Expected Result:
Repair: Perform the following repair:
The switch status changes per the information in
1. Temporarily connect a test ECM.
Table 201.
Results:
3. Recheck the system for active diagnostic
Yes
codes.
4. Repeat the test step.
Repair: Perform the following repair:
5. If the problem is resolved with the test ECM,
Replace the faulty switch.
reconnect the suspect ECM.
Verify that the repair eliminates the problem.
6. If the problem returns with the suspect ECM,
replace the ECM.
STOP.
No There is a problem in the harness between
7. Verify that the repair eliminates the problem.
the switch and the ECM. Proceed to Test Step 7.
STOP.
Test Step 7. Insert a Jumper at the
Test Step 6. Insert a Jumper at the
Bulkhead Connector.
Service Brake Pedal Position (Switch 2).
Table 202
Table 201
Table for Status of the Service Brake Pedal
Position (Switch 2)
Table for Status of the Service Brake Pedal
Position (Switch 2)
Switch Position or
Switch Status
Circuit
Pedal Position
Condition of Switch
Switch
Circuit
Circuit
Status
Service Brake Pedal
OFF
Open
Position Switch 2 Wire is
Service Brake Pedal
Disconnected.
OFF
Open
Position Switch 2 Wires
are Disconnected.
Service Brake Pedal
ON
Shorted
Position Switch 2 Wire
Service Brake Pedal
Connected.
On
Shorted
Position Switch 2 Wires
Connected.
A. Turn the ignition key switch to the OFF position.
A. Turn the ignition key switch to the OFF position.
B. Fabricate a jumper wire 100 mm (4 inch) long.
Crimp a Deutsch pin to each end of the wires.
B. Ensure that ECM vehicle harness connector
J1/P1 is connected.
C. Find the switch for the terminal for the service
brake pedal position (switch 2). Also find the
C. Find the switch for the service brake pedal
terminal for the sensor common for the +battery
position (switch 2) in the vehicle.
in the engine side of the bulkhead connector for
the vehicle harness.
D. Disconnect the wires from the switch terminals.
D. Insert the jumper wire between the two terminals
E. Turn the ignition key switch to the ON position.
in the engine side of the bulkhead connector.
F. Connect the electronic service tool to the cab
E. Turn the ignition key switch to the ON position.
data link connector.
G. Access the electronic service tool status screen.
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