Info

Fault, Fault code

3. Connect voltmeter to C 14 (positive) and ground.

4. Push connector C on the heating/air-conditioning control.

5. Connect voltmeter to C 14 (positive) and C 11 (negative).

Minimum blower speed

6. Connect voltmeter to C 14 (positive) and C 16 (negative).

Minimum blower speed Display: approx. 9 V

Connect voltmeter to positive and pin 3 on driver connector. Connect voltmeter to positive and pin 1 on driver connector.

Minimum blower speed Display: approx. 9 V

Connect voltmeter to positive and pin 2 on the driver connector. Maximum blower speed Display: approx. 12 V

Minimum blower speed

8. Check wiring from heating/air-conditioning control to driver

9. Check blower motor.

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Voltage too high Note

A higher blower voltage can only be caused by a short to ground on the wires to pins 1 or 2 of the driver.

1. Unplug connector C from the heating/air-conditioning control.

2. Unplug connector from the driver,

3. Connect ohmmeter to C 16 and ground. Display: °° £2

4. Unplug connector from the fan motor.

5. Connect ohmmeter to driver connector pin 2 and ground. Display: °° Q

Heating diagnosis

911 Carrera (996)

Fault, Fault code

Possible causes, elimination, notes

Test point 13

Control module

Replace the heating/air-conditioning control

Control module faulty Fault code 32

Test point 14

Sun sensor

Diagnosis conditions

No control module fault stored. No fault with supply voltage (5 volts).

Short to B+ Short to ground Fault code 33

Short to B+/ Short to ground

1. Remove sun sensor,

2. Remove plug connection from sun sensor.

Fault, Fault code Possible causes, elimination, notes

3. Connect voltmeter on sleeve side to pin 2 (negative) and pin 3 (positive).

Switch on ignition.

Display: approx. 4.5-5 volts

If 0 volts is displayed, check wiring to the heating/air-conditioning control A 12 and B 18 for continuity.

Check wiring to the heating/air-conditioning control B 18

for short to ground.

Note

The wiring to the heating/air-conditioning unit is routed via two If the wiring is OK, replace the heating/air-conditioning control.

4. Connect ohmmeter to sun sensor pins 2 and 3. Sun sensor not in darkness

Sun sensor in darkness Display: approx. 240 k£2

Erasing the fault memoiy

Note

The fault memory can be erased only if it was first read out at least once.

The entire fault memory is always erased

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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