Справочник Пользователя для Porsche 912E

 

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The following table provides a quick reference for verifying the measurement 
values for each L-Jetronic fuel injection component. 
 
 

Fuel Injector Valves 

2 – 3 ohm coil resistance 

Thermo-time Switch 

Below 95

0

F = 0 ohms  Above 95

0

F = Infinite  

Cold Start Valve 

Remove cold start valve from manifold and place in a 
container to collect the fuel, reconnect electrical plug. 
Disconnect plug from thermo-time switch and apply 
12Vdc to pin W and ground to pin G of the connector. 
Pressurize the fuel system and observe fuel exiting the 
cold start valve.   

Air Flow Sensor 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

Auxiliary Air Regulator 

Pins of Aux Air Reg should read 30 

Ω.  

Alternate check

 

of contacts would be to read from 88c of dual relay 
and pin 35 of ECU plug.  Aux Air Reg should be open 
when cold. Apply 12 Vdc to pins and it should close 
completely. 

Temperature Sensor II  

 
 
 
 
 
 
(Troubleshooting Hint – Disconnect the sender unit wire at the 
disconnect near the distributor and substitute with resistors at specific 
values (2.5K 

Ω when temp is 70

0

F) and see if problem goes away. 

Ground one side of resistor to engine block.) 
 

Throttle Valve Switch 

Pins 18 to 3 - 0

 

Ω   

with throttle valve wide open  

 

 

 
 

Function Terminal 

Contacts Measurements 

 Air 

Flow 

Sensor 

ECU 

Plug 

Infinite = 

∞   

Ohms =

  Ω

 

  

Air Flow  plus 
limiting resistor 

6 to 9 

6 to 9 

200 – 400 

Ω   

Air Flow without 
limiting resistor 

7 to 8 

8 to 7 

120 –200 

Ω 

Temperature 
Sensor in AFS 

6 to 27 

6 to 27 

2k 

Ω at room temp 

Fuel Pump 
Contacts 

36 to 39 

N/A 

∞ with AFS flap 
closed, 0 

Ω with 

AFS flap open 

Value Temperature 

Range 

2k – 3k 

Ω 

68

0

 F 

7.5k – 12k 

Ω 

14

0

F 

250 – 400 

Ω  

176

0

F