Fault Code 42


Description:  ASD (Automatic ShutDown) relay circuit is open or shorted
Power loss light:  Off
Limp-in mode:  None

Possible Causes

Blown fusible link to power module (or SMEC) - Check the only white fusible link (may look grey if dirty) by tugging on it.  A good link will feel solid while a blown link will stretch like a rubber band. It is the white link on the two-link circuit (not the four or five link circuit).  This link supplies power to the ASD relay and the voltage sense input on the logic module (may be accompanied by a code 16).  See the Fusible Links page for more details.

Bad connection or wiring - Check the wiring and connections between the ASD relay and the logic module.  Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

ASD relay failure - Disconnect the relay, apply 12V to the relay coil, and check the contacts

Diagnostic Method

Trigger Parameters

- Near 0V or near 12V not detected when the relay is turned on or off, respectively


- 12V not detected at output of ASD relay

Results If Component Fails

Fault code 42 is stored.
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This page is maintained by Russell W. Knize and was last updated 08/28/98. Comments? Questions? Send email.

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