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DUAL RELAY TERMINAL PIN
FUNCTION TABLE
RELAY TERMINAL PIN FUNCTION
88Y 12 Volts from Battery via the regulator and rear fuse
panel. This line is not fused.
88d 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.
88z 12 Volts from Battery. This line is not fused.
88b 12 Volts to Limiting Resistors and Injection Valves,
when ignition is on.
88a 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.
88c 12 volts to Auxiliary Air Valve
86 12 Volts to Cold Start Valve, thermo time switch, and
pin 4 of ECU
86a 12 Volts from Ignition Switch (pin 50)
86c 12 Volts from Ignition Switch (pin 15)
85 Ground
85a Not Used
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.