996 Carrera Group 0 Part 1 Diagnosis / PAGE 221
PSM diagnosis 911 Carrera 4 (996) · 8.23 Booster valve 2 circuit
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PSM diagnosis 911 Carrera 4 (996)
8.23 Booster valve 2 circuit
Test Work instruction Result Possible causes of fault
TOI Test: voltage short in signal circuit Less than No:
0.3 V -Short circuit to voltage between:
.Ignition off PSMcontrol module
.Pull wiring harnessplug off of: wiring harnessplug (wiring harness
PSM control module side)
and terminal 52
PSM hydraulic unit iand
.Ignition on PSMhydraulic unit
.Measure voltage betweenthe wiring harnessplug (wiring harness
following terminals: side)
PSM control module terminal 4
wiring harnessplug (wiring harness
side)terminal 52 Note: Check the wiring harness for
and pinching or chafing damage.
ground Yes:102
TO2 Test: short to ground in signal Greater No:
circuit than500 -Short circuit to ground between:
kOhm PSM control module
.Ignition off wiring harnessplug (wiring harness side)
.Measure resistance betweenthe terminal 52
following terminals: and
PSM control module PSMhydraulic unit
wiring harnessplug (wiring harness wiring harnessplug (wiring harness side)
side)terminal 52 terminal 4
and
ground INote: Check the wiring harness for
TO3 pinching or chafing damage.
45 -D 158
Yes:
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