996 Carrera Group 0 Part 1 Diagnosis / PAGE 219
PSM diagnosis 911 Carrera 4 (996) · 8.22 Booster valve 1 circuit
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PSM diagnosis 911 Carrera 4 (996)
8.22 Booster valve 1 circuit
Test Work instruction Result Possible causes of fault
TOI Test: voltage short in signal circuit ILess than No:
0.3 V -Short circuit to voltage between:
.Ignition off PSM control module
.Pull wiring harness plug off of: wiring harnessplug (wiring harness
PSM control module side)
and terminal 54
PSM hydraulic unit and
.Ignition on PSMhydraulic unit
.Measure voltage between the iwiring harnessplug (wiring harness
following terminals: side)
PSM control module terminal 1
wiring harness plug (wiring harness
side) terminal 54 Note: Check the wiring harnessfor
and I pinchingor chafing damage.
ground Yes:T02
TO2 Test: short to ground in signal Greater No:
circuit than 500 -Short circuit to ground between:
kOhm PSMcontrol module
.Ignition off wiring harnessplug (wiring harness side)
.Measure resistance between the terminal 54
following terminals: and
PSM control module PSM hydraulic unit
wiring harness plug (wiring harness wiring harnessplug (wiring harness side)
side) terminal 54 terminal 1
and
!ground Note: Check the wiring harnessfor
Yes: 103 oinchingor chafing~~-
45 -D 156
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