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 (combisensor F691) - defective glow filament (B168)
- Cab heater does not start or fails during operation
1-4 Too many failed start attempts (activation cut-off)
- Cab heater does not start. The cab heater shuts down after a maximum of 255 failed starts and the electronic unit will block.
- Electronic unit released by erasing faults using DAVIE XD
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 (combisensor F691)
- Cab heater fails or emits smoke and supplies insufficient heat
3-1 Voltage (>30 V for at least 20 seconds) on pin 1 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 1 of the ECU (D871) is too low due to:
- insufficient alternator/battery voltage - interruption on pin 1 of the ECU (D871)
- Cab heater fails during operation
4-0 Flame signalling when switching on due to:
- defective flame sensor (combisensor F691) - defective ECU (D871)
- Cab heater does not start
5-1 Short circuit to earth or short circuit to supply of flame sensor (combisensor F691) on pins FF1 and FF2 of the ECU (D871)
- Cab heater does not start or fails during operation
5-2 Interruption of flame sensor (combisensor F691) on pins FF1 and/or FF2 of the ECU (D871)
- Cab heater does not start or fails during operation
5-3 The flame sensor signal (combisensor F691) is out of range
- Cab heater does not start or fails during operation
6-1 Short circuit to earth or short circuit to supply of thermostat unit (E566) temperature sensor on pin 13 and/or 10 of the ECU (D871)
- Cab heater does not start or fails during operation
6-2 Interruption of thermostat unit (E566)
temperature sensor on pin 13 and/or 10 of the ECU (D871)
- Cab heater does not start or fails during operation
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200438 1-3 Airtronic (ACH-EA) fault codes DAVIE XD diagnostics manual
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7-1 Short circuit to earth or short circuit to supply of fuel metering pump (B122) on pin 4 and/or 9 of the ECU (D871)
- 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) 8-1 Short circuit to earth or short circuit to supply of
cab heater fan (B305) on pins BM1 and BM2 of the ECU (D871)
- Cab heater does not start
Internal fault in fan (B305)
8-2 Interruption of cab heater fan (B305) on pins BM1 and/or BM2 of the ECU (D871)
- Cab heater does not start
Internal fault in fan (B305)
8-3 Cab heater fan (B305) speed deviation due to:
- blocked vent
- missing solenoid in electric motor - defective ECU (D871)
- Cab heater fails during operation
9-1 Short circuit to earth or short circuit to supply of glow filament (B168) on pin GS1 and/or GS2 of the ECU (D871)
- Cab heater does not start
9-2 Interruption of glow filament (B168) on pin GS1 and/or GS2 of the ECU (D871)
- Cab heater does not start
10-0 Cab heater gets overheated too often due to:
- clogged hot air pipes
- defective overheating sensor (combisensor F691)
- 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 of thermostat unit (E566) on pin 10, 11 and/or 13 of the ECU (D871)
- 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 of temperature unit (F566) on pin 10 and/or 11 of the ECU (D871)
- 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 of overheating sensor (combisensor F691) on pins UF1 and FF2 of the ECU (D871)
- Cab heater does not start or fails during operation
Fault code Fault code description with possible cause Symptom
Airtronic (ACH-EA) fault codes
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DAVIE XD diagnostics manual
13-2 Interruption of overheating sensor (combisensor F691) on pins UF1 and/or FF2 of the ECU (D871)
- Cab heater does not start or fails during operation
13-3 Combisensor (F691) value is out of measuring range due to:
- clogged hot air pipes
- defective overheating sensor (combisensor F691)
- insufficient supply of inlet air
- defective flame sensor (combisensor)
- Cab heater does not start or fails during operation
Fault code Fault code description with possible cause Symptom
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200438 2-1 System inspection with DAVIE XD DAVIE XD diagnostics manual
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2. SYSTEM INSPECTION WITH DAVIE XD 2.1 GENERAL
Communication between DAVIE XD and the cab heater can only be established if the cab heater is switched on.
System inspection with DAVIE XD
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DAVIE XD diagnostics manual
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200438 1 Contents DAVIE XD diagnostics manual
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10 ABS-D and ABS/ASR-E
CONTENTS
Page Date
1. ABS-D AND ABS/ASR-E FAULT CODES . . . 1-1 . . . 200438 1.1 Introduction . . . 1-1 . . . 200438 1.2 Fault code overview. . . 1-2 . . . 200438 2. SYSTEM INSPECTION WITH DAVIE XD . . . 2-1 . . . 200438 2.1 General . . . 2-1 . . . 200438
Contents
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200438 1-1 ABS-D and ABS/ASR-E fault codes DAVIE XD diagnostics manual
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1. ABS-D AND ABS/ASR-E 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.