What does ABS Code 33 mean on a 1996 Ford Bronco or F-Series?

Code 33 is Rear Axle Speed Sensor Diagnosis. Possible sources include a poor connection at the vehicle speed sensor, terminal damage or backout at ABS module connector pins 21 or 22 or the two-pin sensor connector, an open/shorted sensor coil, open or shorted Circuit 518 (LG/R) or 519 (LG/BK), improper cable routing, or a defective test circuit in the ABS module. The action is to GO to Pinpoint Test K.

Which ABS codes indicate a left front anti-lock sensor problem?

Codes 35, 41, 55, and 75 indicate Left Front Brake Anti-Lock Sensor Diagnosis (Dynamic). The chart directs you to Pinpoint Test L.

What wire colors are used for the right front ABS sensor circuits?

Circuit 514 is Y/R (yellow/red) and Circuit 516 is Y/BK (yellow/black); an intermittent short or open in these circuits can set codes 36, 42, 56, or 76.

What causes ABS Code 51?

Code 51 is Hydraulically Inoperative Front Left Outlet Valve or Sensor Disturbance Detected. Possible sources are a pinched or closed brake line or hose, or a worn or clogged front left outlet valve. GO to Pinpoint Test P.

What is the note about Circuit 523?

The chart notes that some vehicles were built using Circuit 523 (R/PK) in place of Circuit 518 (LG/R) for the rear axle speed sensor circuits.

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1996 Ford Bronco/F-150 4-Wheel ABS Codes 33-77 Diagnosis Chart (06-09B-18)

Scanned 1996 F-150 service manual page, 4-wheel ABS sensor diagnosis trouble-code table

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Scanned Ford service manual page with 4-wheel ABS speed-sensor diagnostic codes and pinpoint-test actions in a condition/source/action table.

AI caption June 2017 · Photo 312 of 413

This is page 06-09B-18 from the 1996 Ford Body/Chassis service manual (F-150, F-250, F-350, Bronco, F-Super Duty), covering Diagnosis and Testing of the 4-Wheel Anti-Lock Brake (ABS) system. The page continues a diagnostic trouble code chart with three columns: Condition, Possible Source, and Action. It covers Rear Axle Speed Sensor Diagnosis (Code 33), Left Front Brake Anti-Lock Sensor Diagnosis Dynamic (Codes 35, 41, 55, 75), Right Front Brake Anti-Lock Sensor Diagnosis Dynamic (Codes 36, 42, 56, 76), Rear Axle Speed Sensor Diagnosis Dynamic (Codes 37, 43, 57, 77), and Hydraulically Inoperative Front Left Outlet Valve or Sensor Disturbance (Code 51). Possible sources include poor connections, terminal damage or backout at module connector pins 21/22, open or shorted sensor circuits (Circuit 518 LG/R, 519 LG/BK, 521 T/O, 522 T/BK, 514 Y/R, 516 Y/BK), air gap issues, axle vibration, RFI/ignition disturbances, and defective trigger circuits in the ABS electronic control module. Notes indicate some vehicles used Circuit 523 (R/PK) in place of 518 (LG/R). Actions direct the technician to Pinpoint Tests K, L, M, N, or P for further diagnosis.

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Frequently asked questions

What does ABS Code 33 mean on a 1996 Ford Bronco or F-Series?: Code 33 is Rear Axle Speed Sensor Diagnosis. Possible sources include a poor connection at the vehicle speed sensor, terminal damage or backout at ABS module connector pins 21 or 22 or the two-pin sensor connector, an open/shorted sensor coil, open or shorted Circuit 518 (LG/R) or 519 (LG/BK), improper cable routing, or a defective test circuit in the ABS module. The action is to GO to Pinpoint Test K.
Which ABS codes indicate a left front anti-lock sensor problem?: Codes 35, 41, 55, and 75 indicate Left Front Brake Anti-Lock Sensor Diagnosis (Dynamic). The chart directs you to Pinpoint Test L.
What wire colors are used for the right front ABS sensor circuits?: Circuit 514 is Y/R (yellow/red) and Circuit 516 is Y/BK (yellow/black); an intermittent short or open in these circuits can set codes 36, 42, 56, or 76.
What causes ABS Code 51?: Code 51 is Hydraulically Inoperative Front Left Outlet Valve or Sensor Disturbance Detected. Possible sources are a pinched or closed brake line or hose, or a worn or clogged front left outlet valve. GO to Pinpoint Test P.
What is the note about Circuit 523?: The chart notes that some vehicles were built using Circuit 523 (R/PK) in place of Circuit 518 (LG/R) for the rear axle speed sensor circuits.