Operation CHARM: Car repair manuals for everyone.
Home >> Porsche >> 2001 >> 911 Carrera 4 Cabriolet (996) F6-3.4L >> Repair and Diagnosis >> Instrument Panel, Gauges and Warning Indicators >> Instrument Cluster / Carrier >> Testing and Inspection >> Component Tests and General Diagnostics >> Checking Actual Values

Checking Actual Values




Checking The Actual Values
In the Actual values menu item, the current values of the following parameters can be read out and checked:

Test point 1
Tiptronic

- Ignition on
- Brake pedal actuated
- Engine off
PST2 display 100 %
- Engine idling
PST2 display P,R,N: 70 %
- Depends on gear engaged
PST2 display:
D:
1st gear 10 %
2nd gear 20 %
3rd gear 30 %
4th gear 40 %
5th gear 50 %
M:
1st gear 15 %
2nd gear 25 %
3rd gear 35 %
4th gear 45 %
5th gear 55 %

See also "Input signals" Transmission and Drivetrain, Transmission Control Systems, Testing and Inspection. Testing and Inspection

Test point 2
Vehicle speed

- Engine off
PST2 display 0 km/h
- Drive vehicle at a constant speed
PST2 display
Tester display approximately equal to actual driving speed in km/h.

Troubleshooting:
- Switch off ignition
- Pull off plug II on the instrument cluster
- Switch ignition on
- Lift the vehicle
- Rotate the rear left wheel by hand
- Measure the voltage between plug II, pin 16 and ground (AC range)
- Voltmeter display > 1 V

If the wheel speed signal is present at the instrument cluster, replace the instrument cluster. If the wheel speed signal is not present at the instrument cluster:
- Switch off ignition
- Pull plug off the ABS control module
- Ohmmeter on instrument cluster plug II pin 16 and ground
Ohmmeter display: Infinity ohm
- Ohmmeter on instrument cluster plug II pin 16 and plug on ABS control module pin 21
Ohmmeter display: < 5 ohm

Test point 3
Speed

- Ignition on
- Engine off
PST2 display 0 rpm
- Engine idling
PST2 display:
Tester display approximately equal to engine speed in rpm

Troubleshooting:
- Switch off ignition
- Pull off plug II on the instrument cluster
- Engine idling
- Measure the voltage between instrument cluster plug II, pin 15 and ground (AC range)
Voltmeter display: > 1 V
- Disconnect plug on DME control module (ME 5.2) or
- Disconnect plug IV on DME control module (ME 7.2)
- Switch ignition on
- Measure the voltage between instrument cluster plug II, pin 15 and ground
Voltmeter display: 0 V
- Ohmmeter on instrument cluster plug II pin 15 and plug on DME control module (ME 5.2) pin 80 or ME 7.2 plug IV pin 17
Ohmmeter display: < 5 ohm
- See also Drive Links, "Tachometer". Drive Links

Test point 4
Supply voltage

- Ignition on
- Engine off
- All loads switched off
PST2 display > 11 V
- Examine battery and generator

Test point 5
Brightness sensor

- Engine off
- Shine the pocket lamp on the sensor
PST2 display:
Tester display increases to a value of approx. 97 % - 100 % Displays darken (dimming takes place slowly).
- Brightening of the sensor PST2 display:
Tester display drops to a value of 0 - 5 %
Displays brighten (dimming takes place slowly).
If there is no change in the dimming, the instrument cluster is faulty.

Test point 6
Total mileage

- Ignition on
- Engine off
PST2 display:
Tester display equals the total mileage in km.
- Check speed signal. See "Actual values" Test point 2 above.

Test point 7
Trip mileage

- Ignition on
- Engine off
Tester display equals the trip mileage in km.
- See also Input signals, Test point 18. Checking The Input Signals

Test point 8
Tank content sensor value

- Engine off
- Tank content greater than 19 liters
PST2 display:
Tester display approximately equal to the sensor value in I.
- Check the wire on the instrument cluster plug I pin 22 to the DME control module for open circuit/short to ground.

Test point 9
Tank content display

- Engine off PST2 display:
Tester display approximately equal to the display in I.
- See also Drive links "Fuel level display, warning light". Drive Links

Test point 10
Coolant temperature

- Engine off (with engine cold)
PST2 display:
Tester display corresponds to the ambient temperature.
- Engine runs at idle speed at operating temperature
PST2 display:
Tester display corresponds to the coolant temperature of 80°C...100°C.

Troubleshooting:
Resistance values:
- Switch off ignition
- Disconnect plug connection X3/1
- Ohmmeter on pin 29 and pin 30 on the sleeve side
Ohmmeter display at 20 °C: approx. 1 Kohm
- Switch ignition on
- Measure voltage at plug connection X3/1 pin 29 and pin 30 on pin side
Voltmeter display: approx. 5 V
- Switch off ignition
- Reconnect plug connection X3/1
- Remove connector of temperature sensor
- Pull off plugs I and II on the instrument cluster
- Switch ignition on
- Measure the voltage between instrument cluster plug II, pin 5 and ground
Voltmeter display: 0 V
- Measure the voltage between instrument cluster plug 17 pin 24 and ground
Voltmeter display: 0 V
- Switch off ignition
- Ohmmeter on instrument cluster plug I pin 24 and plug on temperature sensor pin 2
Ohmmeter display: < 5 ohm
- Ohmmeter on instrument cluster plug II pin 5 and plug on temperature sensor pin 3
Ohmmeter display: < 5 ohm
- See also Input signals, Test point 9 above and Drive links "Coolant warning light and "Coolant temperature". Drive Links

Test point 11
Average consumption

- Engine off
- Select average consumption with on-board computer selector lever
PST2 display:
Tester display approximately equal to actual average consumption
- Switch off ignition
- Pull off plug II on the instrument cluster
- Disconnect plug on DME control module (ME 5.2) or
- Disconnect plug IV on DME control module (ME 7.2)
- Switch ignition on
- Measure the voltage between instrument cluster plug II pin 13 and ground
Voltmeter display: 0 V
- Switch off ignition
- Ohmmeter on instrument cluster plug II pin 13 and ground
Ohmmeter display: Infinity ohm
- Ohmmeter on instrument cluster plug II pin 13 and plug on DME control module (ME 5.2) pin 83 or
- Ohmmeter on instrument cluster plug II pin 13 and on DME control module plug IV, pin 33 (ME 7.2)
Ohmmeter display: < 5 ohm

Test point 12
Average speed

- Engine off
- Select average speed with on-board computer selector lever.
PST2 display:
Tester display approximately equals the average speed
- See also Actual values, "Speed", Test point 2 above.

Test point 13
Outside temperature sensor value

- Engine off
PST2 display:
Tester display approximately equals the ambient temperature

Troubleshooting:
- Warm sensor with fingers and observe the increase in temperature on PST 2. If no change in temperature is determined or displayed:
- Disconnect outside temperature sensor
- Switch ignition on
- Measure the voltage at the outside temperature plug, pin 1 and pin 2
Voltmeter display: approx. 4.5 - 5 V
- Ohmmeter on pin 1 and pin 2 on the outside temperature sensor
Ohmmeter display at 20 °C: 2.5 - 3 Kohm
- Switch off ignition
- Pull off plug I on the instrument cluster
- Switch ignition on
- Measure the voltage between plug I on outside temperature sensor, pin 1 and ground
Voltmeter display: 0 V
- Switch off ignition
- Ohmmeter on outside temperature sensor plug, pin 2 and ground
Ohmmeter display: < 5 ohm
- Ohmmeter on instrument cluster plug I pin 17 and plug on outside temperature sensor pin 1
Ohmmeter display: < 5 ohm

If no fault is established in the wires or on the outside temperature sensor, replace the instrument cluster.

Test point 14
Outside temperature display

- Engine off
PST2 display:
Tester display approximately equals the ambient temperature
- See test point 13.

There is a time delay in the PST 2 for the temperature increase between sensor value and display.

Test point 15
Range on remaining fuel

- Engine off
- Select range on remaining fuel with on-board computer selector lever
PST2 display:
Tester display equals the remaining value displayed in km.
- See also Actual values, "Speed", Test point 2 above and "Average consumption", Test point 11.

pro multis · About Operation CHARM