996 Carrera Group 0 Part 2 Diagnosis / PAGE 342
Fault, fault code Possible causes, elimination, notes · Test point 3
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911 Carrera (996) PCM diagnosis
Fault, fault code Possible causes, elimination, notes
Test point 3
Data lead, Short to ground
PCM-navigation unit 1. Pull off plug II on the display and operator control unit.
Short to ground
Short to B+ 2. Pull off plug on the navigationunit.
Fault code 22
3. Check lead from navigation unit plug pin 5 to plug II pin 4
for short to ground.
Short to B+
1. Pull off plug II on the display and operator control unit.
2. Pull off plug on the navigationunit.
3. Check lead from navigation unit plug pin 5 to plug II pin 4
for short to B+.
Test point 4
Data lead, DSP-PCM Open circuit/short to ground
Open circuiVshort to 1. Pull off plug II on the display and operator control unit.
ground
Short to B+ 2. Pulloff plug I (l8..pole)on the amplifier,
Signal disturbance
Fault code 23 3. Check lead from plug II pin 14 to plug I pin 17 for continuity
and short to ground.
Short to B+
1. Pull off plug II on the display and operator control unit.
2. Pull off plug I (l8-Pole) on the amplifier.
Check lead from plug II pin 14 to plug I pin 17 for short to B+
9101 Diagnosis/troubleshooting, PCM 91 -D233.
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