Porsche 944 User Manual Page 159
- Page / 167
- Table of contents
- BOOKMARKS
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944 S/944 S2 Fuel System - Electronic Control
24/28
No display:
Disconnect plug of speed sender on plug
plate in the engine compartment. Connect
tester leads on middle and outside pins of
the plug on the sender end of the plug with
help of test leads (terminals 1 and 2, pin
end). Start the engine. Sinusoidal oscillation
must be displayed on the screen.
Speed sender plug
Remarks:
The display must remain unchanged after
supplying ground to connection 3.
If not, check power flow, spacing and
condition of the sender.
Test Point 22: Ignition
a) Secondary ignition display
Adjust secondary ignition display an the
oscilloscope. Connect tester leads according
to the supplied operating instructions.
Note:
If a fault is displayed for all cylinders, it is in
the primary or secondary circuit from the
ignition coil to the distributor rotor. If a fault is
displayed for one cylinder, this fault is
located after the distributor rotor.
Primary resistor:
Secondary
resistor:
Term.1 + 15 = 0.4-0.6
Term.1 + 4 = 5-7.2 k
b) Spark plug connectors ( )
Suppression resistor: 3 k
Visual inspection for damage or traces of
burning.
c) Distributor
Distributor rotor, distributor cap: suppression
resistor = each 1 k .
Visual inspection for damage, dirt or wrong
location.
DME - Diagnosing/Troubleshooting
Printed In Germany - XXI, 1989
D 24/28 - 25
- Volume IA - Engine, 16 valves 1
- Table of contents 2
- Drive unit 12
- Connection in the 944 S 15
- Tester cable 16
- Starting error diagnosis 17
- Blank page 24
- Test code list 25
- System adaption 27
- Knock detection 29
- Troubleshooting 31
- Error code 1111 31
- Error code 1112 32
- Error code 1113 33
- Error code 1114 33
- Error code 1121 34
- Error code 1123 36
- Error code 1124 36
- Error code 1125 37
- Error code 1131 38
- Error code 1132 38
- Error code 1133 39
- Error code 1134 39
- Error code 1141 40
- Error code - List 41
- Resetting the error memory 43
- 1. General information 46
- 3.5 Engine-knock registration 50
- 4.1 Service parts (Porsche) 51
- 10 - 0100 52
- 01 - 0101 53
- 10 - 0102 54
- Tolerances and wear limits 54
- 10 - 0103 55
- 10 - 0104 56
- 13 - 102 66
- Pistons from Model 89 onwards 67
- 13 - 105 69
- 15 - 104a 75
- 15 - 104b 76
- 87 - 422 81
- Installing camshafts 83
- 15 - 112 84
- Installing Camshafts Seal 85
- 15 - 112a 85
- 15 - 112b 86
- Camshafts specifikations 86
- 15 - 118 92
- 15 - 119 93
- 15 - 120 94
- Checking the valve guides 97
- 15 - 123 97
- 15 - 124 98
- 15 - 126 100
- Replacing valve guides 100
- 15 - 127 101
- 15 - 128 102
- Replacing the valve guides 102
- 15 - 129 103
- 15 - 131 105
- 15 - 132 106
- 15 - 134 108
- 17 - 102 110
- 24 - 102 118
- 24 - 105 121
- Checking idle speed and CO 122
- 24 - 107 123
- 26 - 100 124
- Blank Page 124
- 28 - 102 128
- 28 - 105 131
- 86/746 B 133
- D 24/28 - 1 135
- D 24/28 - 2 136
- D 24/28 - 3 137
- D 24/28 - 4 138
- Diagnosable DME Control Unit 139
- D 24/28 - 6 140
- D 24/28 - 7 141
- D 24/28 - 8 142
- D 24/28 - 9 143
- Test Point 2: 144
- Test Point 3 145
- Test Point 4 146
- D 24/28 - 13 147
- Test Point 6: 148
- Test Point 149
- Test Point 8: 150
- Test Point 9 150
- Test Point 10 151
- Test Point 11 151
- D 24/28 - 18 152
- Point 15: 153
- Point 16: 153
- Test Point 18: Fuel Pressure 155
- D 24/28 - 22 156
- D 24/28 - 23 157
- Mark Sender 158
- Test Point 22: Ignition 159
- D 24/28 - 26 160
- D 24/28 - 27 161
- Injection Timing (V/ ) 162
- Test Point 25: Leads K and L 163
- D 24/28 - 30 164
- D 24/28 - 31 165
- D 24/28 - 32 166
- Check-Engine Lamp 167
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