Allison Transmission Gen 4 / 5 Connector Pin-Outs

Allison Transmission Gen 4 / 5 Connector Pin-Outs

Allison Gen 4 / 5:

Allison Transmissions B400R / B500R that are Gen 4 / 5, use the same style connectors for the TCM and valve body. These pin-outs are beneficial for component and harness testing.

 

 


 

Allison High Side Drivers (HSD):

 

Allison transmissions use three High Side Drivers (HSD) to energize groups of PCS (Pressure Controlled Solenoid). This minimizes wiring.

 

Once the ignition is turned on, the TCM will send power through all three HSD’s, The TCM will energize the PCS’s by sending a ground PWM (Pulse Modulated Signal) through the solenoid ground wire to complete the circuit.
⇒ The power going through the PCS’s also serve as a feedback to check the wiring and the solenoids. Since the power will back feed through the ground circuit back to the TCM.
⇒ Another thing to note is that the TCM will not log a DTC (Diagnostic Trouble Code) with the ignition on and a component disconnected, open or shorted. It will only log once the vehicle
engine is started.
⇒ Average operating voltage to PCS’s is approximately 6-7 volts.


HSD 1 – Energizes PCS-4, Main Mod and PCS-6 (Seven Speed)
HSD 2 – Energizes PCS-1, PCS-2, PCS-3 and SS1 (Shift Sol. 1)
HSD 3 – Energizes TCC (Torque Converter Clutch), SS2 (Shift Sol. 2) and PCS-5

 

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TCM 80 Pin:

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TCM 80 Pin Connector:

Allison, Allison Transmission, B400R, B500R, Allison Gen 4, Allison Gen 5, Allison pin outs, Allison valve body, valve body, Allison 3000, Allison 4000, Allison electronic controls, Allison TCM, Allison ECU, Allison connectors, 20 pin connector, 80 pin connector, Allison harness

 


 

20 Pin Connector to Valve Body:

Allison, Allison Transmission, B400R, B500R, Allison Gen 4, Allison Gen 5, Allison pin outs, Allison valve body, valve body, Allison 3000, Allison 4000, Allison electronic controls, Allison TCM, Allison ECU, Allison connectors, 20 pin connector, 80 pin connector, Allison harness

 


 

20 Pin Valve Body Connector:

Allison, Allison Transmission, B400R, B500R, Allison Gen 4, Allison Gen 5, Allison pin outs, Allison valve body, valve body, Allison 3000, Allison 4000, Allison electronic controls, Allison TCM, Allison ECU, Allison connectors, 20 pin connector, 80 pin connector, Allison harness

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