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TM 9-2320-312-24-2
Troubleshooting Section
Test Step 7. Insert a Jumper at the
Inspect the vehicle wiring and repair the vehicle
Bulkhead Connector.
wiring, as required. If the problem still exists with
the wiring, send the vehicle to the OEM dealer.
Table 182
STOP.
Neutral Switch Input Status Table
Condition of Switch
Switch Status
Circuit
Circuit
i01858020
Powertrain Data Link Circuit -
Bulkhead wires are
OFF in gear
Open
disconnected.
Test
Bulkhead wires are
ON in neutral
Shorted
connected.
SMCS Code: 1900-081
System Operation Description:
A. Turn the ignition key switch to the OFF position.
Use this procedure under the following situation:
B. Fabricate a jumper wire 100 mm (4 inch) long.
Crimp a Deutsch pin to both ends of the wires.
Use this procedure if one of the following diagnostic
codes are active:
C. Find the neutral switch terminal and the +battery
connection in the engine side of the bulkhead
231-02 J1939 Required Data Not Received (58)
connector for the vehicle harness.
231-11 J1939 Data Link Fault (58)
D. Insert the jumper wire between the two terminals
in the engine side of the bulkhead connector.
231-12 J1939 Device Not Responding (58)
E. Turn the ignition key switch to the ON position.
Also, use this procedure when ET indicates that the
sensor and the ECM are functioning but the engine
F. Connect ET to the cab data link connector.
is not responding to the accelerator pedal position
sensor.
G. Access the status screen.
The following background information is related
H. While the switch status is being monitored on the
to this procedure:
status screen alternately remove the jumper wire
between the two terminals, and alternately insert
Power train Data Link
the jumper wire between the two terminals.
The power train data link is designed to offer
Refer to Table 182.
electronically controlled Anti-Lock Brakes (ABS),
traction control systems, and/or transmission
Expected Result:
controls. This is accomplished by a momentary
reduction of engine rpm and/or engine torque, that
The switch status changes per the information in
is triggered by a signal from an off-engine control
Table 182.
module for the ABS, the traction control, or the
transmission. An off-engine control module is a
Results:
control module that is not part of the Caterpillar
engine control system.
Yes The problem is in the vehicle wiring
between the bulkhead connector and the switch.
With OCT01 and newer Personality Modules,
information from switches may also be transmitted
Repair: Perform the following repair:
over the J1939 data link. The following parameters
can be programmed to send switch information
Inspect the vehicle wiring and repair the vehicle
over the J1939 data link:
wiring, as required. If the problem still exists with
the wiring, send the vehicle to the OEM dealer.
"Cruise Control On/Off Switch"
STOP.
"Cruise Control Set/Resume Switch"
No The problem is in the vehicle wiring between
"Cruise Pause Switch"
the bulkhead connector and the ECM.
"Service Brake Pedal Position Switch #1"
Repair: Perform the following repair:
"Clutch Pedal Position Switch"

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