996 Carrera Group 0 Part 2 Diagnosis / PAGE 148
Fault, Fault code Possible causes, elimination, notes · Test point 2
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911 Carrera (996) Heating diagnosis
8
Fault, Fault code Possible causes, elimination, notes
Test point 2
Outside temperature sensor Diagnosis conditions
No control module fault stored.
Open circuit No fault with supplyvoltage (5 volts).
Short to ground
Fault code 21 Open circuit
1. Unplug connector A from the heating/air-conditioningcontrol,
2. Connectohmmeter to connectors A 7 and A 12.
Display: approx. 1.2 kn at 23 °C
3. Unplug connector from the outside temperature sensor.
4. Connectohmmeter to connector A 7 and pin 1
(connector of outside temperature sensor).
Display: 0 -5 .Q
5. Connectohmmeter to connector A 12 and pin 2
(connector of outside temperature sensor).
Display: 0 -5 .Q
6. Connectvoltmeter to connector A 7 and ground.
Switch on ignition.
Display: 0 volts
If approx. 5 volts are displayed,check wiring harness
for pinchingand chafing damage.
Short to ground
1. UnplugconnectorA from the heatingjair-conditioningcontrol.
2. Connectohmmeter to connector A 7 and ground
Display: 00 .0.
If 0 -5 Q is displayed,check wiring harnessfor pinching
and chafingdamage.
80 01 Diagnosis/troubleshooting, heating 80 -D 17
Printed in Germany -11, 1998 99680Dl
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