Question about 1990 Ford Mustang

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1990 ford mustang lx 5.0L Code 54 How do i fix this

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Fault Code 54

Description: No fuel injector sync pickup signal during engine rotation
Power loss light: On
Limp-in mode: Logic module will guess at injector timing

Possible Causes:
Bad connection or wiring - Check the wiring and connections between the hall effect sensor (located underneath the distributer cap) and the logic module. Check the continuity of the two 3 conductor cables coming out of the sensor--these are prone to fatiguing and breaking inside the insulation where they exit the sensor if the cables are not properly tied down. You may be able to resolder them. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

Hall effect sensor failure - Check the two, flat 3 conductor cables coming out of the sensor. These often fatigue where they exit from the sensor. Upon replacing the sensor, make sure the cables are clipped or tied to the distributor cap shroud (or elsewhere) so they do not swing around.

Diagnostic Method
Trigger Parameters
- Engine cranking or running (signal coming from ignition reference sensor)
- No signal from the fuel injector sync pickup sensor

Results If Component Fails
Fault code 54 is stored. The engine will stall and will not start.

Good luck.

Posted on Apr 22, 2011

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54 - Intake Air Temperature/Air Charge Temperature Circuit Open (CM,O,R)
O-Key On, Engine Off code.
CM-Continuous Memory code.
R-Engine Running code.


From the above information I would say that you need to replace your IAT (Intake Air Temperature) sensor.
It is located in the tube that runs from your air filter to the throttle body.

Posted on Apr 22, 2011

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Posted on Jan 02, 2017

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