DAF CF65, CF75, CF85 Series . Manual - part 58

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ZF intarder EST42 fault codes

ZF INTARDER EST42

DAVIE XD diagnostics manual 

15

1. ZF INTARDER EST42 FAULT CODES

1.1 INTRODUCTION

If the electronic unit detects a system fault, this 

fault is usually stored in the memory of the 

electronic unit as a fault code.

Most system faults will also generate a warning.

ZF INTARDER EST42

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ZF intarder EST42 fault codes

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DAVIE XD diagnostics manual

1.2 EXPLANATORY NOTES TO FAULT CODES FOR ZF-INTARDER EST 42

Fault code

Fault code description with possible cause

Symptom

11-11 

Short circuit to earth in air supply valve (B089):

-

pin  2

-

Delayed activation of intarder

-

No noticeable system limitation

Short circuit to earth in air supply valve output: 

-

pin 1 of intarder unit (D902)

Short circuit in air supply valve outputs

-

pins 1 and 34 of intarder unit (D902)

11-12 

Short circuit to supply in air supply valve (B089):

-

pin  2

-

Delayed activation of intarder

-

No noticeable system limitation

Short circuit to supply in air supply valve output: 

-

pin 1 of intarder unit (D902)

11-13 

Interruption in air supply valve (B089):

-

pin  2

-

Delayed activation of intarder

-

No noticeable system limitation

Interruption in air supply valve output: 

-

pin 1 of intarder unit (D902)

Interruption in air supply valve output: 

-

pin 34 of intarder unit (D902)

13-11 

Short circuit to earth in "intarder active" function 

indication output:

-

pin 29 of intarder unit (D902)

-

No "intarder active" function indication on 

DIP when intarder is activated

-

No noticeable system limitation

13-12 

Short circuit to supply in "intarder active" function 

indication output: 

-

pin 29 of intarder unit (D902)

-

No "intarder active" function indication on 

DIP when intarder is activated

-

No noticeable system limitation

13-13 

Interruption in "intarder active" function indication 

output: 

-

pin 29 of intarder unit (D902)

-

No "intarder active" function indication on 

DIP when intarder is activated

-

No noticeable system limitation

15-11 

Short circuit to earth in brake light relay (G036) 

output:

-

pin 2 of intarder unit (D902)

-

No noticeable system limitation

15-12 

Short circuit to supply in brake light relay (G036) 

output:

-

pin 2 of intarder unit (D902)

-

No noticeable system limitation

16-11 

Short circuit to earth in "intarder warning" function 

indication input: 

-

pin D24 of VIC unit (D900)

-

No noticeable system limitation

Short circuit to earth in "intarder warning" function 

indication output:

-

pin 52 of intarder unit (D902)

16-12

Short circuit to supply in "intarder warning" 

function indication input: 

-

pin D24 of VIC unit (D900)

-

Normal braking effect of the intarder if the 

steering column switch is in position 1. 

-

Reduced braking effect of the intarder if the 

steering column switch is in position 2 or 3. 

(Current through proportional valve is 

restricted to 250 mA max.) 

Short circuit to supply in "intarder warning" 

function indication output:

-

pin 52 of intarder unit (D902)

16-13 

Interruption in "intarder warning" function 

indication input: 

-

pin D24 of VIC unit (D900)

-

No noticeable system limitation

Interruption in "intarder warning" function 

indication output:

-

pin 52 of intarder unit (D902)

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ZF intarder EST42 fault codes

ZF INTARDER EST42

DAVIE XD diagnostics manual 

15

18-11 

Short circuit to earth in supply voltage input for 

steering column switch: 

-

pin B11 of steering column switch (C831)

-

No braking effect of intarder possible in any 

position of steering column switch

-

No "intarder active" function indication on 

DIP when intarder is activated

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

Short circuit to earth in supply voltage output for 

steering column switch

-

pin 30 of intarder unit (D902)

18-12 

Short circuit to supply in supply voltage input for 

steering column switch (C831): 

-

pin  B11

-

No noticeable system limitation

Short circuit to supply in supply voltage output for 

steering column switch: 

-

pin 30 of intarder unit (D902)

19-11 

Short circuit to earth in proportional solenoid 

valve input: 

-

pin 4 of intarder unit (D902)

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

Short circuit in proportional solenoid valve inputs

-

pins 4 and 3 of intarder unit (D902)

19-12 

Short circuit to supply in proportional solenoid 

valve input: 

-

pin 4 of intarder unit (D902)

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

19-13 

Interruption in proportional solenoid valve output 

(B088): 

-

pin 1 or 2

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

Interruption in proportional solenoid valve output: 

-

pin 3 or 4 of intarder unit (D902)

19-14 

Circuit resistance for proportional solenoid valve 

(B088) is not within the specifications

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

21-11 

Short circuit to earth in proportional solenoid 

valve output (B088):

-

pin 1 or 2

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

Short circuit to earth in proportional solenoid 

valve input (B088): 

-

pin 3 of intarder unit (D902)

21-12 

Short circuit to supply in proportional solenoid 

valve output (B088):

-

pin 1 or 2

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

Short circuit to supply in proportional solenoid 

valve input (B088): 

-

pin 3 of intarder unit (D902)

23-16 

Internal fault in intarder unit (D902)

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

23-17 

Internal fault in intarder unit (D902)

-

No braking effect of intarder possible in any 

position of steering column switch

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

Fault code

Fault code description with possible cause

Symptom

ZF INTARDER EST42

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ZF intarder EST42 fault codes

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DAVIE XD diagnostics manual

31-15 

Incorrect or missing vehicle speed signal via 

message on CAN network due to:

-

interruption on pin 22

-

short circuit to earth on pin 49

-

short circuit to supply on pin 22 and/or 49

-

Incorrect CAN message from MTCO unit

-

Normal braking effect of the intarder if the 

steering column switch is in position 1. 

-

Reduced braking effect of the intarder if the 

steering column switch is in position 2 or 3. 

(Current through proportional valve is 

restricted to 250 mA max.)

-

No speed indication on DIP if V-constant 

function is activated

-

No V-constant function possible

32-11 

Short circuit to earth or supply in intarder coolant 

temperature sensor output (F544):

-

pin  1

-

Normal braking effect of the intarder if the 

steering column switch is in position 1. 

-

Reduced braking effect of the intarder if the 

steering column switch is in position 2 or 3. 

(Current through proportional valve is 

restricted to 250 mA max.)

Short circuit to earth or supply in intarder coolant 

temperature sensor input: 

-

pin 9 of intarder unit (D902)

Short circuit in intarder coolant temperature 

sensor inputs: 

-

pins 9 and 37 of intarder unit (D902)

32-13 

Interruption in intarder coolant temperature 

sensor output (F544)

-

pin 9 or 37

-

Normal braking effect of the intarder if the 

steering column switch is in position 1. 

-

Reduced braking effect of the intarder if the 

steering column switch is in position 2 or 3. 

(Current through proportional valve is 

restricted to 250 mA max.)

Interruption in intarder coolant temperature 

sensor input: 

-

pin 9 or 37 of intarder unit (D902)

33-18 

Short circuit to supply in supply voltage input for 

position 2 of steering column switch: 

-

pin 42 of intarder unit (D902)

-

Normal braking effect of the intarder if the 

steering column switch is in position 1. 

-

Reduced braking effect of the intarder if the 

steering column switch is in position 2 or 3. 

(Current through proportional valve is 

restricted to 250 mA max.)

-

No V-constant function possible

Short circuit to supply in supply voltage input for 

position 3 of steering column switch: 

-

pin 16 of intarder unit (D902)

Short circuit in supply voltage inputs for positions 

2 and 3 of steering column switch:

-

pins 16 and 42 of intarder unit (D902)

41-19 

Incorrect or missing accelerator pedal position 

signal via message on CAN network due to:

-

interruption on pin 22

-

short circuit to earth on pin 49

-

short circuit to supply on pin 22 and/or 49

-

incorrect message from UPEC unit

-

The V-constant function is not deactivated 

when the accelerator pedal is operated

-

No noticeable system limitation

42-19 

Incorrect or missing vehicle speed signal via 

message on CAN network due to:

-

interruption on pin 22

-

short circuit to earth on pin 49

-

short circuit to supply on pin 22 and/or 49

-

incorrect message from MTCO unit

-

Intarder is not deactivated if there is an ABS 

intervention in the ABS/EBS system

-

No noticeable system limitation

43-19 Overloaded 

CAN 

communication system 

between all vehicle systems. Not all CAN 

messages can be sent in the same cycle. This 

may be caused by: 

-

short circuit to supply on pin 22

-

defective CAN terminating resistance

-

Actuation of exhaust brake not possible 

during temperature-dependent reduction of 

the braking effect of the intarder.

-

AS Tronic gearbox does not shift down 

automatically when the intarder is activated. 

44-15 

No CAN communication between any vehicle 

systems due to: 

-

interruption on pin 22

-

short circuit to earth on pin 49

-

short circuit to supply on pin 22 and/or 49

-

Actuation of exhaust brake not possible 

during temperature-dependent reduction of 

braking effect.

-

AS Tronic gearbox does not shift down 

automatically when the intarder is activated. 

Fault code

Fault code description with possible cause

Symptom