996 Carrera Group 0 Part 1 Diagnosis / PAGE 174
8.3 CAN bus communication circuit · Test Work instruction Result Possible causes of fault
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911 Carrera 4 (996) PSM diagnosis
8.3 CAN bus communication circuit
Test Work instruction Result Possible causes of fault
TOl voltage short in signal circuit Lessthan No:
11 V -Short circuitto voltagebetween:
.Ignition off PSMcontrol module
.Pull wiring harnessplug off of: wiring harnessplug (wiring harnessside)
PSM control module terminals61, 63
and and
PSM steering-anglesensor PSMsteering-anglesensor
and wiring harnessplug (wiring harnessside)
DME control module terminals2, 1
.Ignition on and
.Measure voltage betweenthe DMEcontrol module
following terminals: wiring harnessplug IV(wiring harnessside)
PSM control module wiring harness terminals36, 37
plug (wiring harness side) terminals
61,63 Note: The connectionpoints 136, 137
and are locatedbetweenthe PSMcontrol
ground moduleand the DMEcontrolmodule.
Yes: T02 These must also be checked.
TO2 Test: short to ground in signal Greater No:
circuit than 500 -Short circuitto groundbetween:
kOhm PSMcontrol moduleIwiring
.Ignition off harnessplug (wiring harnessside)
.Measure resistance betweenthe 'terminals61, 63
following terminals: and
PSM control module wiring harness PSMsteering-anglesensor
plug wiring harnessplug (wiring harnessside)
(wiring harness side)terminals 61, 63 terminals2, 1
and and
ground DMEcontrol module
wiring harnessplug IV(wiring harnessside)
terminals36, 37
Note: The connectionpoints136, 137
are locatedbetweenthe PSMcontrolI
moduleand the DMEcontrol module.
Yes:TO3 These must also be checked.
45 -DIll
Test:
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