ALLISON Transmission Solenoids 3000/4000 Series

Solenoid Location - ALLISON Transmission 3000/4000 Series

Figure 1.1 - Control Valve Assy (Allison 4700 OFS) 

PCS-Pressure Control Solenoid
SS-Shift Solenoid
TCC-Torque Converter Clutch
PS-Pressure Switch


Solenoids location in the Control Module are as illustrated in Figure 1.2 and 1.3. Refer to Figure 1.2 as necessary when using the DTC schematics.

Figure 1.2 - Control Module Solenoid Location

SOLENOID AND CLUTCH CHART

Basic Configuration

7-Speed Configuration (3000/4000 Product Families)

Note:

X - Indicates solenoid is electrically ON

Y - Indicates clutch is hydraulically applied.

Blank - Indicates solenoid is electrically OFF or clutch is not hydraulically applied

O - Optional ON or OFF

* See NVL explanation below:

NVL - As a diagnostic response:

If Turbine Speed is below 150 Rpm when Output Speed is below 100 Rpm and Engine Speed is above 400 Rpm, Neutral Very Low (NVL) is commanded when N-C5 (Neutral) is the selected range. NVL is achieved by turning PCS4 Solenoid "ON" in addition to PCS3 being "ON", which locks the output. Otherwise, PCS4 Solenoid is turned "OFF" N1 (Neutral).

As a commanded range when shifting to Fire Truck Pump Mode:

While wire 123 is energized before wire 122 is energized when going into Fire Pump Truck Mode, Neutral Very Low (NVL) will be commanded to lock the output to assist the shifting of the split-shaft PTO transfer case from road mode to pump mode. While wire 123 is de-energized before wire 122 is de-energized when shifting out of Fire Truck Pump Mode, Neutral Very Low (NVL) will be commanded to lock the output to assist the shifting of the split-shaft PTO transfer case from pump mode to road mode.

#Additional Note:

→TCC Solenoid, Allison P/N 29541897 (Color Coded Natural Brown)

→PCS1 Solenoid, Allison P/N 29541897 (Color Coded Natural Brown)

→PCS2 Solenoid, Allison P/N 29544297 (Color Coded Natural Brown)

→PCS3 Solenoid, Allison P/N 29544297 (Color Coded Natural Brown)

→PCS4 Solenoid, Allison P/N 29544297 (Color Coded Natural Brown)

→Main Mod Solenoid, Allison P/N 29544297 (Color Coded Natural Brown)

→Shift Solenoid, Forward (SS1), Allison P/N 29545638

→Shift Solenoid, Forward (SS2), Allison P/N 29546693

→Pressure Switch (PS1), Allison P/N 29552364

Read More:

Solenoids Location on ALLISON Transmission 5000/6000 Series

Solenoids Location on ALLISON Transmission 9800 Series (S9820)

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