Porsche 928 Workshop Manual page 1280

39
Differential, transaxle system 928
Fault, DTC
Possible causes, remedy, notes
2. Measure resistance between the following PINS at the control unit
plug:
PIN 19 to PIN 17
PIN 22 to PIN 17
PIN 2 to PIN 17
Nominal value approx. I...2 n
PIN 21 to PIN 23
Nominal value approx. 2...4 .Q
If the nominal value is conect, proceed with 3.
If incorrect values are obtained, localize the fault as appropriate.
From PINS 19. 22, 2 to PIN 17 = ABS valves + wiring.
From PIN 21 to PIN 23 = Lock valve + wiring.
Re ABS valves + wires
Pull off the IZpole plug
at
the hydraulic unit.
Measure the internal resistance of the solenoid valves.
PIN 1 to PIN 4
PIN 3 to PIN 4
PIN 5 to PIN 4
Nominal value approx. 0.7...1.7 n
Nominal value not obtained: replace hydraulic unit.
D39 - 242
a
PSD diagnosis/Troubleshooting
Printed
in Gemuny - XXXV. 1996