Farmer 400
Fav 700
Fav 900
Electrics / system in general
Y025 / R001 - cold-start aid / heater plug solenoid valve
E
Testing
900 > 23/3001
20.2.2001
9000
000072
E
b
4/5
Capitel
Docu-No.
Index
Date
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Y025 / R001 - cold-start aid / heater plug solenoid valve
PM-Picturemodule
PM-Picturemodule
Text-module
Switching functions of cold-start system
(see electric circuit diagrams - Chapter 9000 Index C)
Preheating (voltage 12 VDC )
Ignition "ON". At low temperatures heater-plug indicator lights up and shows when engine is ready to
start. At ambient temperature (air temperature) above 2.5
°
C +/- 2.5
°
C no preheating.
Actuation sequence
Voltage is applied to contact 30 of cold-start aid and is transferred via 80 amp fuse to cold-start aid
e-box.
Ignition ON, relay K001 closes, voltage is present at fuse F013.
There is voltage at contact G of cold-start aid. Contact H sends earth signal from cold-start aid to
instrument panel for heater-plug indicator.
At cold-start aid ambient temperature of below 2.5
°
C +/- 2.5
°
C relay in cold-start aid closes. Voltage
present at contacts N and P - heater plug R001 glows. Once indicator on instrument panel flashes,
engine is ready to start.
Depress clutch pedal, solenoid switch S012 closes, there is voltage at relay K008 and relay closes.
Voltage is transferred via fuse F028 and contact K to cold-start aid. Relay in cold-start aid closes, there
is voltage at contact J of cold-start aid, solenoid valve Y025 opens, fuel flows to heater plug R001 when
engine is turning over.
PMTAB_Picture
If no fuel flows from line, check that solenoid
valve Y025 is functioning.
Farmer 400, Fav 700: Remove plug from
"Engine off" solenoid valve Y007.
Fav 900 chassis number 23/3001 and up:
Remove compact plug from A020 - ECU, EDC.
Note:
Confirm EDC fault.
Air temperature below 2.5
°
C +/- 2.5
°
C
Operate starter motor.
Check voltage at electrical terminal of solenoid
valve Y025.
Target value: approx. 12 VDC
If necessary, check electrical cables according to
circuit diagram, or fit new solenoid valve Y025.
PMTAB_Picture
Remove heater plug R001 for testing.
Connect cable and fuel line.
Farmer 400, Fav 700: Remove plug from
"Engine off" solenoid valve Y007.
Fav 900 chassis number 23/3001 and up:
Remove compact plug from A020 - ECU, EDC.
Note:
Confirm EDC fault.
Operate starter motor.
Blow on plug to enhance flame.
Clearly visible flame must be present.
Fit new heater plug R001 if necessary.