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RELAY TERMINAL PIN
88Y
88d
88z
88b
88a
88c
86
86a
86c
85
85a
L-Jetronic System Diagram The next diagram is a schematic drawing of the
complete L-Jetronics fuel injection system. This diagram was adapted from the
Porsche 912E Workshop Manual and has been enhanced to provide additional
information to assist in isolating fuel injection problems.
DUAL RELAY TERMINAL PIN
FUNCTION TABLE
12 Volts from Battery via the regulator and rear fuse
panel. This line is not fused.
12 Volts to Fuel Pump. This output to the fuel pump is
available only while cranking the engine, or after the
engine has started, through the pump relay contacts in
the air flow sensor.
12 Volts from Battery. This line is not fused.
12 Volts to Limiting Resistors and Injection Valves,
when ignition is on.
12 Volts to pin 39 (pump relay contacts) of Air Flow
Sensor and 12 Volts to pin 10 of ECU. This is present
only when 12 Volts is present at pin 86c, which comes
from the ignition switch.
12 volts to Auxiliary Air Valve
12 Volts to Cold Start Valve, thermo time switch, and
pin 4 of ECU
12 Volts from Ignition Switch (pin 50)
12 Volts from Ignition Switch (pin 15)
Ground
Not Used
FUNCTION
20
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