Question about 1993 Ford Ranger SuperCab
Code 542 is the only one you need to worry about, and you've got the wrong
definition for it (or at least you need some term correction). Code 542
simply means there is a fuel pump circuit failure, i.e. there's no
voltage seen by the PCM going to the fuel pump. This could be as simple
as a bad relay or fuse.
From service literature.... DTC 542 indicates that one of the following has occurred:
-- Inertia Fuel Shutoff (IFS) switch not reset or electrically open.
-- Open circuit between the fuel pump and FPM circuit connection to the power-to-pump circuit.
-- Poor fuel pump ground.
-- Fuel pump electrically open.
-- Fuel pump secondary circuit short to power.
-- Fuel pump relay contacts always closed.
-- Open in FPM circuit between PCM and connection to the power-to-pump circuit.
-- Left/front HO2S short to power (dual HO2S applications).
-- Damaged Powertrain Control Module (PCM).
l Does the engine start? (For trucks with dual fuel tanks, verify tank selector is in the same position it was when KOEO DTC 542 was received.)
GO to «J11».
GO to «J15».
Check woth ypur dealer about this TSB. Hope this helps.
Posted on Feb 02, 2011
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