Skoda Octavia Workshop Manual page 25

OCTAVIA
Test table display group 000
Display Readout on V.A.G
block 1552
1 less than 35
greater than 156
2 less than 186
greater than 226
3 less than 18
greater than 37
4 not within
tolerance
1) Depending on outside temperature
Edition 11.98
S00.5109.51.20
Possible cause of fault
1)
♦ Open circuit in wiring or short circuit to
intake air temperature sender
1) ♦ Intake air temperature sender faulty
♦ Alternator faulty, battery severely
discharged
♦ Heavy load on electrical circuit shortly after
starting as a result of high charge current
and ancillaries
♦ Contact resistance in voltage supply or
earth connection for engine control unit
♦ Power drain when ignition off
♦ Voltage regulator at alternator faulty
♦ Overvoltage caused by jump-starting or
quick-charger
♦ Coolant temperature sender or cable
connection to engine control unit faulty
♦ Radiator dirty
♦ Radiator fan not operating
♦ Coolant thermostat faulty
♦ Engine too cold
♦ Coolant temperature sender or cable
connection to engine control unit faulty
♦ Coolant thermostat always open
♦ Air filter soiled or air supply blocked
♦ Unmetered air
Self-Diagnosis
- Test cable to sender for open circuit and
- Test intake air temperature sender
- Test voltage, charge battery
- Increase engine speed slightly for a few
- Test voltage supply for engine control unit
- Eliminate power drain
- Test voltage, replace regulator if necessary
- Interrogate fault memory ⇒ page 01-4
- Test coolant temperature sender -G62
- Clean radiator
- Test operation of radiator fan
- Test thermostat
- Warm up engine
- Test coolant temperature sender -G62
- Test thermostat
- Replace air cleaner or clear air supply
- Rectify cause of unmetered air
Rectifying fault
short circuit
⇒ page 24-34
minutes and switch off ancillaries
⇒ page 24-38
⇒ page 24-31
⇒ page 24-31
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