Fault code 2 1 4 2, knock sensor

[Gisli Ottarsson <gisli@master.adams.com>]

I am now getting fault code 2 1 4 2.  Mockry writes:

2142 
         Knock sensor #1
         Open or short circuit, Defective sensor
         Check sensor and wiring
         Symptom: Timing retarded, High fuel consumption, power loss,
         Boost pressure not attained

I am at a slight loss how to debug this, short of sticking in a $100+
replacement.  How the heck do I check the sensor?  Is there a simple
check for open or short circuit that I can perform with a multimeter?

'87 5kcstq, 181kmi.

Thanks in advance.

Gisli

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Gisli Ottarsson, PhD                     
Mechanical Dynamics Inc.            gisli@adams.com    
2301 Commonwealth Blvd.             Tel: 1-734-913-2550
Ann Arbor, Michigan 48105           Fax: 1-734-994-6418