996 Carrera Group 0 Part 2 Diagnosis / PAGE 340
Fault, fault code Possible causes, elimination, notes · Test point 1
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911 Carrera (996) PCM diagnosis
Fault, fault code Possible causes, elimination, notes
Test point 1
Data lead, air conditioner Open circuit/short to ground
-PCM
1. Pull off plug II on the display and operator control unit.
Open circuiVshort to
ground 2. Pull off plug C on the heater / A/C control unit.
Short to B+
Signal disturbance 3. Check lead from plug II pin 15 to plug C 12 for continuity
Fault code 20 and short to ground.
Note
The lead is routed via the lQ-pole plug connection
on the heater/ A/C unit.
Short to B+
1. Pull off plug II on the display and operator control unit.
2. Pull off plug C on the heater / A/C control unit.
3. Check lead from plug II pin 15 to plug C 12 for short to B+,
Signal disturbance
Check wiring harness for short with other leads,
9101 Diagnosis/troubleshooting, PCM 91 -D21
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