Removing Odometer Pause Wiring Modifications

TSB-54-100-WST

Creation Date: 2025-08-20

Engine or Vehicle Affected:

» 49X
»47X

This is an informational bulletin only. The described condition is a product improvement and is not warrantable.
Described Condition

For vehicles with Common Powertrain Controller (CPC5) software installed prior to January 9, 2024, hardware
and software modifications were necessary to allow vehicle speed and mileage sensors to be ignored during
split shaft Power Takeoff (PTO) operations. This bulletin applies to Freightliner and Western Star vehicles
equipped with Detroit® engines and the CEEA+ architecture.

This bulletin provides instructions on removing the wiring modifications described in the ‘Odometer Pause’
Service Solution before the CPC5 software update. After removing the obsolete wiring modifications, see TEM-
11=00012: Odometer pause for Split Shaft PTO Applications to implement a parameter solution to pause the
odometer.

Determining Which Service Solution Was Applied
The following solutions were available based on vehicle type and odometer pause method:

e Tone Wheel - SS 755 — WST X Series Odometer Reading Incorrect with Split Shaft PTOs

e Tone Wheel — SS 3126 — M2/SD CEEA+ Odometer Reading Incorrect with Split Shaft PTOs

e Relay Option — SS 750 — WST2023 Odometer Disable in Split Shaft PTO Mode

e Relay Option — SS 3127 — M2 and SD CEEA+ Trucks Odometer Disable in Split Shaft PTO Mode
Replacement of SS 755 or SS 3126 — Tone Whee]
The following wiring and parameter changes are to be made to remove the old service solution.

Wiring Changes
@ Important: The tone ring or vehicle speed sensor does not need to be removed.

1. Disconnect the harness from the sensor and securely tie back the connector into the harness. The disconnected harness and speed
sensor do not affect the vehicle operations after the vehicle speed sensor parameter is changed.

Parameter Changes
Verify that parameters are set to the factory settings.

1. _ Turn the keyswitch to the ON position.
2. — Connect an RP1210B-compliant vehicle diagnostic adaptor to the diagnostic connector on the vehicle.

3. Connect the other end of the adaptor to the laptop. Ensure the laptop is connected to a power source.

© Important: Make sure that DiagnosticLink is updated to the latest version (8.21
SP3 at the time of publication or newer), before programming the vehicle.

4. — Open DiagnosticLink®.

5. Use the DTNA Portal credentials to connect DiagnosticLink to the server.

6. _ Go to the ‘Parameters’ tab. Select and expand the ‘CPC501T - Common Powertrain Controller’ parameter folder.
7. Select the ‘330 - Vehicle Speed Sensor’ parameter subfolder.

8. — Set the parameter value to ‘Vehicle Speed Sensor = OutShaftSpeed CAN’

Replacement of SS 750 or SS 3127 Allison OSS Relay Solution

This section describes how to rewire the Allison Output Shaft Speed (OSS) sensor to the Original Equipment
Manufacturer (OEM) configuration.

Figure 1 shows the modification diagram for the system to be removed.

Alison TOM Ailsos Tranyr son
Output Speed Sensor Low 140' 37 M2 497 M2 x34] Output Speed Sensor -
Quiput Speed Sersor High 1a fo xa Output Speed Semor +
Purp Mode = GNO inp 12 497M1
Pump Mate =+12 Vino 3 2.2% Orn Resistor

4974

Relay
(shown Se-energzed }

49701

497 04
°22V SH PTC Pin?

Park Brake Signal
oDsengage
xine
Felay
(hownde-ene gzed)
2
GNOs
Driveline WOOK Suite
Coon = Xk Connected & $5°TO mococnex
GNO =XX déconmected & SSPTO soon
07/28/2025 1548918

Fig. 1, Allison Split Shaft PTO (SSPTO) Modification Diagram

Wiring Changes

Note: With the relays removed, the control signals, directed to the park brake
signal node, and the driveline disconnect switch are to be connected to the Allison
Transmission Control Module (TCM) pins 122 and 123. Control signals to TCM
123 and 122 are to be re-established. The two relays no longer sequence signals
to the TCM.

1. Remove the 2.2K ohm resistor. Leave the circuit 497M2 intact.
2. — Remove both ends of 497M11 from the relay and connect 497M1 again. Leave the TCM pin 160 and the output speed sensor pin X34
intact. The final configuration is shown in Fig. 2.

Allison TCM

Output Speed Sensor Low
Output Speed Sensor Hgh
Pump Mode GND Input
Pump Mode 12 V Input

Allison Transmission

Output Speed Sensor

Output Speed Sensor

07/28/2025

Fig. 2, Allison OSS Sensor Wiring

548919

3. Remove the remaining relay for the driveline status. Keep the wires 497D1 and 497D4 intact. These wires connect to the TCM pins 122 and

123 and are re-used.

4. — After the relay circuits are removed, the fourth gear lock-up function needs to be enabled by sending power to TCM 123 and a switch to
ground for TCM 122 when the driveline is disengaged, and the SSPTO is engaged.

© TCM 123 reflects the selection of pump mode by the operator and the application of the park brake.

© TCM 122 indicates that the split shaft PTO is fully engaged, and the driveline is disengaged.

5. _ After removing the relay circuits, for instructions to set the Single Signal Detect and Actuation Module (SSAM) and CPCS5 parameters for
the odometer pause function, see TEM-54-00012: Odometer Pause for SSPTO.

Parameter Changes

There are no parameters to be changed.

Verificati

After following these instructions, the vehicle must operate as stated in the body manufacturer’s operation
manual. Start the vehicle, engage the SSPTO, and raise the engine rpm as per the Truck Equipment
Manufacturer's operating instructions.

If the engine rpm drops below normal idle speed after following the instructions described in TEM-54-00012,
follow the instructions for delaying activation of PTO mode until direct drive gear has been attained.

Warranty.

This is an informational bulletin only. The described condition is a product improvement and is not warrantable.

Note:

wi2

wi4

wié

wi7
REMOVE
REPLACE
TROUBLESHOOT
027-033-023
025-001-103
045-021-022
034-004-107
053-025-003
025-001-103
034-004-107

Document Number: 0000158034
Topic Publication Date: 2025-08-20