996 Carrera Group 0 Part 2 Diagnosis / PAGE 152
Fault, Fault code Possible causes, elimination, notes · Test point 6
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911 Carrera (996) Heating diagnosis
Fault, Fault code Possible causes, elimination, notes
Test point 6
Supply voltage Diagnosis conditions
(5 volts) No control module fault stored,
Voltage too high Voltage too high
Voltage too low
Fault code 25 1. Unplug connector C from the heating/air-conditioningcontrol.
2. Connectvoltmeterto C 8 andground.
Switchon ignition.
Display: a volts
If the battery voltage is displayed, check the wiring harness
for pinchingand chafing damage.
3. Push on connector C
4. Connectvoltmeter to C 8 and ground.
Switch on ignition.
Display: 5 :i: 0.5 volts
If more than 5.5 volts are displayed,replace the heating/air-conditioning
control.
Voltage too low
1. UnplugconnectorC from the heating/air-conditioningcontrol,
2. Unplugall connectorsfrom the valve drive motors,
3. Connectohmmeter to connector C 8 and ground.
Display: 00 .Q
If 0 -5 .Q is displayed, check wiring harness for pinching
and chafing damage.
8001 Diagnosis/troubleshooting, heating 80 -D 21
Printed in Germany -11, 1998 99680Dl
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