Instruments Consumption indicators Burglar alarm

Fuel consumption indicator, upshift indicator 90-1

Troubleshooting - fuel consumption indicator 90-2

Troubleshooting - upshift indicator 90-3

Relay arrangement, Model 84 onward 90-5

Fuses in central electric system, Model 84 onward 90-7

Fuses in auxiliary fuse box, Model 84 onward 90-8

Instrument cluster, Model 85/2 onward 90-9

Instrument cluster, removing and installing, Model 85/2 onward 90-13

Sensor for speedometer, removing and installing 90-14

Checking instruments . 90-15

Checking burglar alarm 90-19

Checking auxiliary control unit, burglar alarm 90-20

Radio, Telephone, On-board computer

Retrofitting radio in vehicles prepared for radio installation from Model 85/2 onward . . 91-1 Connections in vehicles prepared for radio installation from Model 86 onward . . . . . 91-3

Preparatory equipment for telephone 91-5

Retrofitting CD player, Model 89 onward 91 -15

Windshield wipers and washer

Windshield wiper/washer, removing and installing, Model 85/2 onward 92-1

Electric pump for windshield washer system, removing and installing 92-2

Exterior lights

Lubricating concealed-headlight linkage 94-1

Switch covers, removing and installing, Model 85/2 onwards 94-3

Lock cylinder, removing and installing, Model 85/2 onward 94-5

Beam control, removing and installing actuator . < 94-7

Checking beam control 94 - 8

Adjusting headlamps with beam control 94-9

Wiring

Central electric system, removing and installing, Model 85/2 onward 97-01

Central electric system, assignment , 97 - 03

Cable-harness modification 97-04

Supplementary electrical equipment . 97-05

Table of contents 1

Printed in Germany - XXII, 1989

Page

Current-flow diagram - Type 944 Model 82 97 -1

Current-flow diagram ?Type 944 Model 83 > , . .97 -19

Current-flow diagram -:Type .944 Mode! 84 , , ^ ... . 97 - 33

Circuit diagram - Type 944p944 turfeo 85/2 §7 - 52 A

Circuit diagram 1 Type 944, 944 turbo, Mode! 86 . 97-71

Circuit diagram - Type 944, 944 turbo, 944 S, Model 87 .97 - 97

Circuit diagram - Type 924 S, Model 87 . . .97 - 515

- 4 ^ 1 -c . • r' Printed in Germany - XX!I, 1989

ECONOMY CONTROL Upshift Indicator

UPSHIFT INDICATOR

(Extra for USA Cars with

Manual Transmission)

Description and Troubleshooting

Both systems are integrated in the tachometer.

Car Teile Tacho Instrumente

Economy Control

The upshift indicator lights up when it is practicle and economical to shift up into the next higher gear. It works in gears 1 through 4 and remains on until the next higher gear :rc is selected or the operating condition causing display changes (e. g. coasting, full throttle, etc.).

The indicator lamp is designed for good recognition in daylight and will have less brightness when main lights are switched on.

The electronic control for both systems is housed in the tachometer and, as also the indicator lamp, cannot be replaced separately.

Signals Required for Operation

Economy Control — Road speed (hall sensor signal) from speedometer

— Injection signal (t| signal) from DME control unit

The economy control displays the instantaneous fuel consumption in Itr./ 100 km (miles per gallon) or Itr./hour (gallons per hour) depending on road speed and injection time (tj = signal of fuel injectors).

Upshift Indicator — Engine speed (ignition term. 1)

— Coolant temperature

— Road speed (hall sensor signal) from speedometer

— Injection time (tj signal) from DME control unit

TROUBLESHOOTING ECONOMY CONTROL

1. Check voltage on two-pin plug next to the DME control unit.

Remove Porsche 944 Dme

A = Plug for economy control and upshift indicator (square version)

B = Plug for altitude correction box USA (round version)

Term. 1 (black wire) should have battery voltage with ignition turned on.

3. The tachometer must be removed (plugs remain connected) to measure the hall sensor signals in the speedometer. Term. 5 and H + should have battery voltage with ignition turned on.

JH A

g ftp

4. Connect voltmeter on term. HG (hall sensor pulse).

Lift and turn left front wheel slowly by hand.

Voltage should rise and drop four times from less than 1 volt to more than 6 volts for each wheel revolution (square-wave pulses).

2. Term. 2 of two-pin plug will have the injection signal with the engine running and it can be seen with help of an oscilloscope.

The injection signal is a square-wave signal, which increases in width as speed picks up.

.TROUBLESHOOTING UPSHIFT INDICATOR

If the upshift indicator malfunctions, perform same tests as for troubleshooting the economy control.

Additional Tests:

1. Coolant temperature gauge in instrument cluster must be okay. Signal comes from tachometer term. 4 and is sent to the instrument cluster.

2. Term. 6 of tachometer should have the ignition pulse (ignition coil term. 1) with the engine running.

If a defect is not found after troubleshooting the economy control or upshift indicator, check power flow in wires and contact of wires or, if necessary, replace tachometer.

•RELAY ARRANGEMENT - Since 1984 Models a

Porsche 944 Relay Diagram

*4 — Relay for headlight cleaners

*5 — Warning time relay with gong (USA) Catalytic converter monitoring control unit (Japan)

6 — Relay for rear window defogger and seat belts

8 — Relay for additional high beams

10 — Relay for intermittent action

11 — Relay for flashing lights

Relays 4 and 5 changed since December, 1983

Porsche 924 Intermittent Wiper Relay

— Relay for power windows

— Relay for radio or radio and lifting roof

Installation Point:

Center console at bottom left behind trim.

Porsche 944 Alarm Control Unit

— Relay for air conditioner

— Relay for blower shutoff

Installation Point:

Below glove box of trim panel behind knee guard.

1983 Porsche 944 Fog

— Relay for front fog lamps Installation Point:

Underneath instrument panel next to steering column.

Porsche 944 Fuse Box

— Relay for lifting roof Installation Point:

In luggage compartment on left side behind trim panel.

•FUSES ON CENTRAL ELECTRIC BOARD -Since 1984 Models

No. Equipment Amperes

1 Low beam, left 8

2 Low beam, right 8

3 High beam, left 8

4 High beam, right 8

5 Additional high beams 16

6 Hazard lights 8

7 Radio, clock, cigar lighter, inside lights 8

8 Stop lights 8

9 Backup lights, turn signal indicator lamps, outside mirror motor 8

10 Outside mirror heating, control wire for rear window defogger 16

11 Windshield wipers 8

12 Instrument lights, glove box light, ashtray light, license plate lights 1 8

13 Marker light, right 8

14 Marker light, left 8

15 Front fog lamps 16

FUSES IN AUXILIARY FUSE BOX -Since 1984 Models

Porsche 924 Fuel Pump Fuse

No. Equipment Amperes

1 Concealed headlight motor 16

2 Fuel pump 16

3 Blower motor 16

4 Rear window defogger 25

5 Condenser fan (air conditioner) 16

6 Compressor, evaporator fan 25

7 Rear fog light 8

8 Power windows 16

9 Blower, tailgate unlocking motor 25

INSTRUMENT CLUSTER SINCE 1985/2 MODELS

INSTRUMENT CLUSTER SINCE 1985/2 MODELS

Porsche 944 Clocks Measurement

No.

Description

Qty.

Note When: Removing installing

Special instructions

1

Phillips screw

9

2

Housing

1

3

Nut

4

4

Washer

4

5

Plug connector

4

6

Temperature/fuel gage

1

7

Gasket

2

8

Voltmeter/oil pressure gage

1

9

Speedometer

1

Take out carefully

10

Tachometer

1

11

Bolt (long)

7

12

Nut

5

13

Washer

5

14

Printed circuit board

1

15

Solenoid

1

Unweld spots Cement, if ca ref u 11 y necessary

16

Bolt (short)

2

i

17

Foam rubber

1

18

Light bulb with holder

4

1.2 W

19

Light bulb with holder

16

1.2 W

No.

Description

Qty.

Note When: Removing Installing

Special Instructions

20

Light bulb with holder

3

2 W

21

Instrument carrier plate

1

22

Printed circuit terminal

3

23

Printed circuit terminal

4

24

Printed circuit

1

Porsche 944 Tachometer

REMOVING AND INSTALLING INSTRUMENT CLUSTER SINCE 1985/2 MODELS

1. Pull off cover plate by hand. 3. Unscrew mounting screws on instrument

Unscrew nut and take off steering cluster, wheel.

2. Unscrew and take off instrument cover.

4. Unlock and take off plug connections on instrument cluster.

Printed in Germany - V, 1985 Removing and Installing Instrument Cluster 90 - 13

Since 1985/2 Models

REMOVING AND INSTALLING TRANSMITTER FOR SPEEDOMETER

The transmitter is located on the left side of the transmission next to the axle shaft flange.

1. Pull off plug on transmitter.

2. Loosen and unscrew transmitter with a suitable tool. The bottom hexagon belongs to the mechanical drive of the transmitter.

Note

Check specified tightening torque when tightening the transmitter.

Tightening torque: 4 Nm.

Ground Points Porsche 924

Checking the instruments

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