Fault Code 17-1985


Notes:  For 1985 models only

Description: Detonation sensor output is too low
Power loss light:  On
Limp-in mode:  None

Possible Causes

Bad detonation sensor - The detonation sensor should produce voltage spikes above 0.04V at 5,000 rpm (you will need an oscilloscope to see them).  Remove the sensor and tap on the bottom of it with a wrench.  This should produce voltage spikes of a couple of volts.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module.  Clean and regrease any corroded connectors with dielectric grease.  Check to see that the sensor threads do not have tape on them.  This may prevent it from getting a good ground.

Diagnostic Method

Trigger Parameters

- Engine speed above 5,000 rpm
- Sensor voltage output is not greater than 0.04V for 3 seconds

Results If Component Fails

Fault code 17 is stored and the power loss light is turned on.  If the sensor ever outputs more than 0.04V, the power loss light is turned off.
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This page is maintained by Russell W. Knize and was last updated 08/28/98. Comments? Questions? Send email.

Copyright © 1996-2003 Russ W. Knize