Passat L4-1984cc 2.0L DOHC (1991)
Knock Sensor: Technical Service Bulletins
Knock Sensor - Test Procedure
Group: 28
Number: 92-01
Date: September 30, 1992
Subject:
New knock sensor checking procedure
Model(s):
Passat Syncro (with Engine code PG),
Canada Only
This bulletin supersedes TB number 91-03 (Repair Group 28) of November 30, 1991.
The following checking procedure replaces the information found on page 28-80-1 of the Passat Syncro Repair Microfiche.
Knock Sensor, checking
Vehicles WITHOUT On-Board diagnostic capability CANNOT have the knock sensor functionally checked.
The complaint "high speed not attainable" can be caused by an intermittent or nonfunctioning knock sensor.
Possible causes:
^
disconnected wiring
^
corroded terminals (poor or no contact)
^
knock sensor shield damaged
^
mounting bolt incorrectly torqued; must be 20 Nm (15 ft lb)
^
abnormal noises caused by:
^
torn or loose brackets
^
loose wiring
^
loosened components
^
broken, loose or missing bolts
^
mechanical damage
If NO fault found
^
replace knock sensor
