Porsche 928 Workshop Manual page 574

28
Ignition System 928
Troubleshooting
Relay output Effect
El
E2
AL
61
Injection circuit I
switched off
Injection circuit I
switched off
Injection circuit II
switched off
Injection circuit I
switched off
Injection circuit I
switched off
Injection circuit II
switched off
Fault code
1132 or 1232
Fault crxie
1132 or 1232
Short circuit to + Us
Short circuit to ground
Discontinuity
Short circuit to + Us
Short circuit to ground
Discontinuity
Short circuit to + Us
Shortcircuit to ground
Discontinuity
Voltage at
terminal 61 less than 3.5
Possible test
Measure voltage
Display: Battery voltage
Measure resistance
to ground
Display: 0 D
Measure resistance
between El and E2
Measure voltage
Display: Battery voltage.
Measure resistance
to ground
Display: 0 D
Measure resistance
between El and E2
Measure voltage
Display: Battery voltage
Measure resistance
to ground
Display: 0 R
Measure resistance
between terminal AL and
pin 28 LH control unit
Measure voltage
Display: Battery voltage
with engine running
Injection circuit I switched off red LED illuminated in relay housing
Injection circuit II switched off green LED illuminated in relay housing
26 - 78
a
Checking the ignition circuit monitoring relay
Printed in Germany - XXII. 1989