Power Flows (page 2 of 8)

AUTOMATIC TRANSMISSION – ZF 5HP24

44-2-26 DESCRIPTION AND OPERATION

Engine torque is transferred, via operation of single or combinations of clutches, to the planetary gear train. The 
planetary gear train is controlled by reactionary inputs from brake clutches and the freewheel clutch to produce five 
forward gears and one reverse gear.

The following tables show which clutches are operating for selected gear ratios and which solenoids are activated to 
produce the required torque output from the transmission.

Gear Range Reference Chart

Gear Change Solenoid Reference Chart

Gear 

Selector 

Lever 

Position

Gear

Engine 

Braking 

Yes/No

Ratio

Clutches

Freewheel 

Locked Y/N

A

B

C

D

E

F

D

1

Y

3.57

X

Y

D

2

Y

2.20

X

X

D

3

Y

1.51

X

X

D

4

Y

1.00

X

X

D

5

Y

0.80

X

X

P/N

–

–

–

X

R

 

Y

– 4.10

X

X

Gear Selector 

Lever Position

Gear

Shift Control Solenoids

Pressure Regulating Solenoids

SV1

SV2

SV3

EPRS1

EPRS2

EPRS3

EPRS4

EPRS5

D

1

ON

OFF

OFF

ON

ON –

ON

OFF

ON –

D

2

ON

ON

OFF

ON

OFF

ON

OFF

ON

D

3

OFF

ON

OFF

ON

ON

ON

OFF

OFF

D

4

OFF

ON

OFF

ON

OFF

OFF

– ON –

OFF

D

5

OFF

OFF

OFF

ON

ON

OFF

– ON –

OFF

N

ON

OFF

ON

ON

– ON

ON

OFF

– ON

R

OFF

ON

OFF

ON

ON –

ON

OFF

ON –

TCC Lock-up

OFF

OFF

OFF

OFF

OFF

OFF

ON

OFF

ON = Active (pressure build up); OFF = Inactive; – = Inactive (pressure drain)