P0377 Ford

Ford P0377 OBD-II Trouble Code Definition:

P0377 Timing Reference High Resolution Signal B Too Few Pulses

P0377 FordĀ OBD-II Trouble CodeDescription:

OBD Trouble Code P0377
Timing Reference High Resolution Signal “B” Too Few Pulses
What does the code mean? OBD-ii Code P0377 definition:
The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing. This test monitors the number of high resolution pulses which have been missed (not detected). It’s based on a comparison between the number of pulses that were detected since the last pump cam pulse and the number of the pulses that should have occurred. There are approximately 64 high resolution pulses for every cam pulse.
Symptoms Sumptoms of OBD code P0377
– Engine Light ON (or Service Engine Soon Warning Light)
Causes Causes of the OBD-II code P0377
– Open or short in the optical sensor circuit – Optical sensor connector – Damaged optical sensor – Damaged PCM or ECM The Error code is generally activated on detection of the following conditions: Some high resolution pulses are missing from the optical sensor to the PCM
Solutions – If damage, repair optical sensor circuit – Replaced optical sensor – Replaced PCM or ECM