Fault Code 42-1984


Notes:  For 1984 models only

Description:  Injector control circuit1 open or shorted
Power loss light:  Off
Limp-in mode:  None

Possible Causes

Bad connection or wiring - Check the wiring and connections to injectors 1 and 2 in the injector harness (above the fuel rail) and between the harness and the power module (or SMEC) and the injector contol lines between the logic module and power module.  Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

Injector driver darlington transistor failure - Check the injector signals coming from the power module (or SMEC).  They should rise to about 12V when the injector is off and drop close to 0V when the injector is on.  If they are out of spec, you may need to replace the power module.

Diagnostic Method

Trigger Parameters

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

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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