Fault Overview

Fault Overview Of 911 Carrera (996) As Of Model Year '02
- In order to ensure that a fault is no longer present after a repair or after the fault memory has been erased, a short test or test drive should be performed. Only in this way can you ensure that all diagnostic routines have been performed by the DME control module.
- In the case of Tiptronic vehicles, the Tiptronic fault memory must also be read out, because activation of the Check Engine MIL can also be initiated by the Tiptronic.
- The fault memory must always be deleted after repairs.

Fault type 1: Signal implausible/Implausible operating range/Malfunction
Fault type 2: Open circuit/No signal
Fault type 3: Short to ground/Below lower limit/Lean mixture threshold
Fault type 4: Short to B+/Above upper limit/Rich mixture threshold

*: In the event of misfiring faults, the fault types have a different meaning.
Fault type 1: Emission-relevant fault after start-up
Fault type 3: Emission-relevant fault during the journey
Fault type 4: Fault damaging to TWC

**: In the event of oxygen sensor faults, the fault types have a different meaning.
Fault type 1: All electrical faults (open circuit, short to B+ or ground) lead to this fault output
Fault type 2: Injection of oxygen sensor heating into the sensor signal
Fault type 3: Oxygen sensor aging fault, sensor dynamics
Fault type 4: Oxygen sensor aging fault, sensor contamination, characteristic shift

CE Check Engine MIL
0 Function deactivated
1 CE is flashing, fault damaging to TWC
2 CE is on, emission relevant fault
3 CE is on after 2 driving cycles
4 CE is on after 5 seconds
5 CE is off, fault output to scan tool
6 CE is off, emission relevant fault
7 Fault caused by short test
11 Fuel supply fault, CE is on after 2 driving cycles, higher freeze frame priority
30 CE is on after 3 driving cycles
31 CE is on after 3 driving cycles with misfires
32 CE is off, fault output to scan tool after 3 driving cycles
33 Fuel supply fault, CE is on after 3 driving cycles, higher freeze frame priority