DAF 95XF. Manual - part 199

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D3LC (ACH-EA) fault codes

D3LC (ACH-EA)

DAVIE XD diagnostics manual 

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1. D3LC (ACH-EA) 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.

D3LC (ACH-EA)

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D3LC (ACH-EA) fault codes

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DAVIE XD diagnostics manual

1.2 EXPLANATORY NOTES TO FAULT CODES D3LC (ACH-EA)

Fault code

Fault code description with possible cause

Symptom

0-0

Internal fault in ECU (D871) due to:
-

defective ECU (D871)

-

insufficient battery voltage

-

Cab heater does not start or fails during 
operation

0-1

Internal fault in ECU (D871) due to:
-

defective internal temperature sensor in 
ECU (D871)

-

Cab heater does not start or fails during 
operation

1-0

Fault when starting ACH-EA, no flame is detected 
within the start time due to:
-

no or insufficient supply of fuel

-

insufficient supply of inlet air

-

clogged exhaust

-

defective flame sensor (F626)

-

defective glow filament (B168)

-

Cab heater does not start. After 2 failed 
starts the cab heater switches off and 
generates a fault.

2-0

Flame extinguishes repeatedly during operation 
due to:
-

no or insufficient supply of fuel

-

insufficient supply of inlet air

-

clogged exhaust

-

defective flame sensor (F626)

-

Cab heater fails or emits smoke and 
supplies insufficient heat

3-1

Voltage (>30 V for at least 20 seconds) on pin A5 
of the ECU (D871) is too high due to:
-

excessive alternator/battery voltage

-

Cab heater fails during operation

3-2

Voltage (<20 V for at least 20 seconds) on pin A5 
of the ECU (D871) is too low due to:
-

insufficient alternator/battery voltage

-

interruption on pin A5 of the ECU (D871)

-

Cab heater does not start

4-0

Flame signalling when switching on due to:
-

defective flame sensor (F626)

-

defective ECU (D871)

-

Cab heater does not start

5-1

Short circuit to earth or short circuit to supply on 
pins FW1 and FW2 of the ECU (D871), flame 
sensor (F626)

-

Cab heater does not start or fails during 
operation

5-2

Interruption on pin FW1 and/or FW2 of the ECU 
(D871), flame sensor (F626)

-

Cab heater does not start or fails during 
operation

6-1

Short circuit to earth or short circuit to supply on 
pins A8 and A13 of the ECU (D871), temperature 
sensor (F509)

-

Cab heater does not start or fails during 
operation

6-2

Interruption on pin A8 and/or A13 of the ECU 
(D871), temperature sensor (F509)

-

Cab heater does not start or fails during 
operation

7-1

Short circuit to earth or short circuit to supply on 
pin A11 and/or A3 of the ECU (D871), fuel 
metering pump (B122)

-

Cab heater does not start

Internal fault in fuel metering pump (B122)

7-2

Interruption on pin 4 and/or 9 of the ECU (D871), 
fuel metering pump (B122)

-

Cab heater does not start

Internal fault in fuel metering pump (B122)

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D3LC (ACH-EA) fault codes

D3LC (ACH-EA)

DAVIE XD diagnostics manual 

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8-1

Short circuit to earth or short circuit to supply on 
pins BM1 and BM2 of the ECU (D871), fan (B305)

-

Cab heater does not start

Internal fault in cab heater fan (B305)

8-2

Interruption on pin BM1 and/or BM2 of the ECU, 
fan (B305)

-

Cab heater does not start

Internal fault in cab heater fan (B305)

8-3

Cab heater fan (B305) speed deviation due to:
-

blocked fan (B305)

-

missing solenoid in electric motor

-

defective ECU (D871)

-

Cab heater fails during operation

9-1

Short circuit to earth or short circuit to supply on 
pin A9 and/or A11 of the ECU (D871), glow 
filament (B168)

-

Cab heater does not start

9-2

Interruption on pin A9 and/or A11 of the ECU 
(D871), glow filament (B168)

-

Cab heater does not start

10-0

Cab heater gets overheated too often due to:
-

clogged hot air pipes

-

defective overheating sensor (F627)

-

insufficient supply of inlet air

-

Cab heater fails during operation

10-4

ACH-EA safety function switched on as a result 
of:
-

too many overheatings

-

The ECU is blocked

12-1

Short circuit to earth or short circuit to supply on 
pins A8, A13, A7 and/or A14 of the ECU (D871), 
thermostat unit (E566)

-

Cab heater does not start

-

Cab heater does not switch on or off at the 
desired temperature

Internal fault in thermostat unit (E566) or timer 
unit (E581)

12-2

Interruption on pin 10 and/or 11 of the ECU, 
thermostat unit (E566)

-

Cab heater does not start

-

Cab heater does not switch on or off at the 
desired temperature

Internal fault in thermostat unit (E566) or timer 
unit (E581)

13-1

Short circuit to earth or short circuit to supply on 
pins UF1 and UF2 of the ECU, overheating 
sensor (F627)

-

Cab heater does not start or fails during 
operation

13-2

Interruption on pin UF1 and/or UF2 of the ECU, 
overheating sensor (F627)

-

Cab heater does not start or fails during 
operation

Fault code

Fault code description with possible cause

Symptom

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D3LC (ACH-EA) fault codes

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DAVIE XD diagnostics manual