Fault Code 27-TBI


Notes:  For single-point injection engines only

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

Possible Causes

Bad connection or wiring - Check the wiring and connections between the fuel injector 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 transistor failure - Check the injector signal coming from the power module (or SMEC).  It should rise to about 12V when the injector is off and drop close to 0V when the injector is on.  If it is 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 driver is turned on or off, respectively

Results If Component Fails

Fault code 27 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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