P1764

P1764
Instrument cluster triggering no signal change.

Function:
The Tiptronic control module (pin 25) is connected with the Instrument cluster (pin 11/17) via a serial data lead.

Specification:
Signal type = PWm
Frequency = 50 Hz
Level = 0 ... 12 V

Diagnosis Condition:
- Ignition on




Wiring Diagram:




Diagnosis Procedure:



1 Check PWm signal with the Porsche System Tester 2.
1. Connect Porsche System Tester 2 and call up "Instrument cluster actual values/Tiptronic."
move selector lever to position "P" and run engine at idle speed.

Display: 70 %.

Note



The pulse width in the individual gears can also be tested using the Porsche System Tester 2 while the vehicle is being driven.

2 Check wire from Tiptronic control module to instrument cluster for continuity.
1. Pull off instrument cluster connector II (white). (The dashboard insert must be removed for this purpose; see Page 70-5)
2. Pull off Tiptronic control module connector.
3. Connect ohmmeter to Tiptronic control module connector pin 25 and instrument cluster connector II (white) pin 17.

Display: 0 ... 5 ohm.

If infinite ohm is displayed, check wiring harness for chafing and pinching damage.

2 Check wire from Tiptronic control module to instrument cluster for short circuit to ground.
1. Connect ohmmeter to Tiptronic control module connector pin 25 and ground.

Display: infinite ohm.

If 0 .. 5 ohm is displayed, check wiring harness for chafing and pinching damage.

2 Check wire from Tiptronic control module to instrument cluster for short circuit to B+.
1. Switch on ignition.
2. Connect voltmeter to Tiptronic control module connector pin 25 and ground.

Display: 0 Volt.

If battery positive voltage is displayed, check wiring harness for chafing and pinching damage.