DAF CF65, CF75, CF85 Series . Manual — part 34
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1-5
Hydronic 10 (ACH-EW) fault codes
HYDRONIC 10 (ACH-EW)
DAVIE XD diagnostics manual
6
1.3 EXPLANATORY NOTES TO FAULT CODES FOR HYDRONIC 10 (ACH-EW)
WITH ELECTRONIC UNIT D979
The below explanatory notes to fault codes apply
to the Hydronic 10 (ACH-EW) with the electronic
unit D979. The electronic unit can be identified by
the connector which is directly fitted in the unit.
Applicable to:
CF85 and XF95 (chassis number
0E621373)
production date
2003-37
K101651
Fault code
Fault code description with possible cause
Symptom
0-0
Internal communication fault in ECU (D979) due
to:
-
defective ECU
-
Cab heater does not start or fails during
operation
0-1
Internal communication fault in ECU (D979) due
to:
-
defective ECU
-
Cab heater does not start or fails during
operation
1-0
Fault when starting ACH-EW, no flame is
detected within the start time. Flame sensor value
remains below 80ºC, voltage on pins 15 and 16 of
the 18-pin connector at the bottom of the ECU
<2.23 V due to:
-
no or insufficient supply of fuel
-
insufficient supply of inlet air
-
clogged exhaust
-
fouled or damaged burner
-
voltage too high or too low during glowing
-
Cab heater does not start. After 2 failed
starts the cab heater switches off and
generates a fault.
1-4
Too many starts without flame detection due to:
-
no or insufficient supply of fuel
-
insufficient supply of inlet air
-
clogged exhaust
-
fouled or damaged burner
-
voltage too high or too low during glowing
-
Cab heater shuts down after 10 failed starts
(20 start attempts) and the ECU will block
HYDRONIC 10 (ACH-EW)
1-6
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Hydronic 10 (ACH-EW) fault codes
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DAVIE XD diagnostics manual
2-0
Flame extinguishes repeatedly during operation
due to:
-
no or insufficient supply of fuel
-
insufficient supply of inlet air
-
undervoltage or overvoltage
-
excessively high flame sensor temperature
-
excessively high overheating sensor
temperature
-
defective combustion device
-
fouled or damaged burner
-
clogged or fouled exhaust
-
Cab heater fails or emits smoke and
supplies insufficient heat
3-1
Voltage (>30 V for at least 20 seconds) on pins
C2 and C3 of the ECU (D979) 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 pins
C2 and C3 of the ECU (D979) is too low due to:
-
insufficient supply voltage, for example
during starting
-
Cab heater fails during operation
4-0
Flame signalling when switching on. Flame
sensor value above 80ºC, despite 4 minutes'
cold-air ventilation; voltage on pins 15 and 16 of
the 18-pin connector at the bottom of the ECU
>2.23 V due to:
-
defective flame sensor
-
Cab heater does not start
5-1
Flame sensor short circuit on pins 15 and 16 of
the 18-pin connector at the bottom of the ECU
-
Cab heater does not start or fails during
operation
5-2
Open connection of flame sensor on pins 15 and
16 of the 18-pin connector at the bottom of the
ECU
-
Cab heater does not start or fails during
operation
6-1
Short circuit in coolant temperature sensor on
pins 14 and 18 of the 18-pin connector at the
bottom of the ECU
-
Cab heater does not start or fails during
operation
6-2
Open connection of coolant temperature sensor
on pins 14 and 18 of the 18-pin connector at the
bottom of the ECU
-
Cab heater does not start or fails during
operation
7-1
Short circuit in fuel metering pump (B122) on pins
C4 and C3 of the ECU
-
Cab heater does not start or fails during
operation
7-2
Open connection in fuel metering pump (B122)
on pins C4 and C3 of the ECU
-
Cab heater does not start or fails during
operation
8-3
Combustion device speed deviation due to:
-
defective combustion device
-
defective electronic unit (D979)
-
Cab heater fails with a delay of 60 seconds
during operation
9-1
Glow filament short circuit on pins 2 and 7 of the
18-pin connector at the bottom of the ECU
-
Cab heater does not start
9-2
Open connection of glow filament on pins 2 and 7
of the 18-pin connector at the bottom of the ECU
-
Cab heater does not start
10-0
Too fast a rise in coolant temperature due to:
-
poor flow of coolant
-
coolant shortage
-
use of intarder
-
Cab heater fails during operation
Fault code
Fault code description with possible cause
Symptom
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1-7
Hydronic 10 (ACH-EW) fault codes
HYDRONIC 10 (ACH-EW)
DAVIE XD diagnostics manual
6
10-4
ACH-EW safety function switched on as a result
of:
-
too many overheatings
-
Cab heater fails. The ECU blocks after 3
failed starts.
11-1
Short circuit in coolant circulation pump on pins 3
and 6 of the 18-pin connector at the bottom of the
ECU
-
Cab heater does not start or fails during
operation
11-2
Open connection of coolant circulation pump on
pins 3 and 6 of the 18-pin connector at the bottom
of the ECU
-
Cab heater does not start or fails during
operation
13-1
Overheating sensor short circuit on pins 11 and
17 of the 18-pin connector at the bottom of the
ECU
-
Cab heater does not start or fails during
operation
13-2
Open connection of overheating sensor on pins
11 and 17 of the 18-pin connector at the bottom
of the ECU
-
Cab heater does not start or fails during
operation
13-3
Difference between value of overheating sensor
and value of coolant temperature sensor too large
due to:
-
poor flow of coolant
-
coolant shortage
-
use of intarder
-
Cab heater does not start or fails during
operation
15-1
Short circuit in wiring "signal ACH-EW on" to pin
A1 on ECU ALS-S (D911)
-
No interior detection alarm system (ALS-S)
Fault code
Fault code description with possible cause
Symptom
HYDRONIC 10 (ACH-EW)
1-8
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Hydronic 10 (ACH-EW) fault codes
6
DAVIE XD diagnostics manual
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