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1993-1996 4WABS trouble codes WITH troubleshooting guide!

iLoveMyExploder

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City, State
Texas
Year, Model & Trim Level
1993 Explorer XLT 4X4
after much research... I found it! im sure someone will find this info useful!

1993-1996 4WABS trouble codes WITH troubleshooting guide!

Codes:
11 Possible Source(s):
-Anti-lock brake electronic control module failure.
Action(s) to take:
-REPLACE anti-lock brake electronic control module.

16 Possible Source(s):
-System OK.
Action(s) to take:
-None.

17 Reference Voltage/Intermittent Valve Fault
Possible Source(s):
- 30 amp fuse open.
- Intermittent connections to battery, main relay or ground.
- Main relay coil or contacts open.
- Open or short to ground in Circuit 532 (O/Y).
- Open or short to ground in Circuit 599 (PK/LG).
- Open or short to ground in Circuit 601 (LG/PK).
- Short to ground through anti-lock hydraulic control unit.
- Intermittent valve failures.
- High resistance valves.

22 Front Left Inlet Solenoid Valve Concern Diagnosis
Possible Source(s):
- Intermittent open Circuit 495 (T).
- Terminal backout in anti-lock brake electronic control module connector Pins 17 and 40.
- Terminal backout in anti-lock hydraulic control unit connector Pins 1, 4 and 6.
- Open or shorted inlet front left valve coil.
- Open or shorted driver in anti-lock brake electronic control module.

23 Front Left Outlet Solenoid Concern Diagnosis
Possible Source(s):
- Intermittent open Circuit 496 (O).
- Terminal backout in anti-lock brake electronic control module connector Pins 17 and 26.
- Terminal backout in anti-lock hydraulic control unit connector Pins 1, 4 and 7.
- Open or shorted outlet front left valve coil.
- Open or shorted driver in anti-lock brake electronic control module.

24 Front Right Inlet Solenoid Valve Concern Diagnosis
Possible Source(s):
- Intermittent open Circuit 497 (W).
- Terminal backout in anti-lock brake electronic control module connector Pins 17 and 34.
- Terminal backout in anti-lock hydraulic control unit connector Pins 1, 4 and 8.
- Open or shorted inlet front right valve coil.
- Open or shorted driver in anti-lock brake electronic control module.

25 Front Right Outlet Solenoid Valve Concern Diagnosis
Possible Source(s):
- Intermittent open Circuit 498 (PK).
- Terminal backout in anti-lock brake electronic control module connector Pins 17 and 15.
- Terminal backout in anti-lock hydraulic control unit connector Pins 1, 4 and 5.
- Open or shorted outlet front right valve coil.
- Open or shorted driver in anti-lock brake electronic control module.

26 Rear Axle Inlet Solenoid Valve Concern Diagnosis
Possible Source(s):
- Intermittent open Circuit 499 (GY/BK).
- Terminal backout in anti-lock brake electronic control module connector Pins 17 and 33.
- Terminal backout in anti-lock hydraulic control unit connector Pins 1, 4 and 2.
- Open or shorted inlet rear axle valve coil.
- Open or shorted driver in anti-lock brake electronic control module.

27 Rear Axle Outlet Solenoid Concern Diagnosis
Possible Source(s):
- Intermittent open Circuit 510 (T/R).
- Terminal backout in anti-lock brake electronic control module connector Pins 17 and 27.
- Terminal backout in anti-lock hydraulic control unit connector Pins 1, 4 and 3.
- Open or shorted outlet rear axle valve coil.
- Open or shorted driver in anti-lock brake electronic control module.

31 Left Front Brake Anti-Lock Sensor Diagnosis (Static)
Possible Source(s):
- Poor connection at left front brake anti-lock sensor.
- Terminal damage or backout in anti-lock brake electronic control module connector Pins 24 and 25.
- Terminal damage or backout in two-pin sensor connector.
- Open or shorted left front brake anti-lock sensor.
- Open or shorted Circuit 521 (T/O) or 522 (T/BK).
- Improper front left anti-lock brake sensor cable routing leading to above.
- Defective front left wheel speed sensor electrical test circuit in anti-lock brake electronic control module.

32 Right Front Brake Anti-Lock Sensor Diagnosis
Possible Source(s):
- Poor connection at right front brake anti-lock sensor.
- Terminal damage or backout in anti-lock brake electronic control module connector Pins 36 or 23.
- Terminal damage or backout in two-pin anti-lock brake sensor connector.
- Open or shorted right front brake anti-lock sensor.
- Open or shorted Circuit 514 (Y/R) or 516 (Y/BK).

33 Rear Axle Speed Sensor Diagnosis
Possible Source(s):
- Poor connection at vehicle speed sensor.
- Terminal damage or backout in anti-lock brake electronic control module connector Pins 21 or 22.
- Terminal damage or backout in two-pin sensor connector.
- Open or shorted vehicle speed sensor coil.
- Open or shorted Circuit 518 (LG/R) or 519 (LG/BK).
- Improper vehicle speed sensor cable routing leading to above.
- Defective vehicle speed sensor electrical test circuit in anti-lock brake electronic control module. Note: some vehicles were built using Circuit 523 (R/PK) in place of 518 (LG/R).

35
41
55
75 Left Front Brake Anti-Lock Sensor Diagnosis (Dynamic)
Possible Source(s):
- Damaged/missing front brake anti-lock sensor indicator teeth or missing front brake anti-lock sensor indicator.
- Air gap too small or too large.
- Excessive axle vibration.
- Weak front brake anti-lock sensor.
- Loose front brake anti-lock sensor.
- INTERMITTENT short or open in Circuit 521 (T/O) or 522 (T/BK).
- Disturbances caused by ignition or radio frequency interference.
- Defective trigger circuit in anti-lock brake electronic control module.

36
42
56
76 Right Front Brake Anti-Lock Sensor Diagnosis (Dynamic)
Possible Source(s):
- Damaged/missing front brake anti-lock sensor indicator teeth or missing front brake anti-lock sensor indicator.
- Air gap too small or too large.
- Excessive axle vibration.
- Weak front brake anti-lock sensor.
- Loose front brake anti-lock sensor.
- INTERMITTENT short or open in Circuit 514 (Y/R) or 516 (Y/BK).
- Disturbances caused by ignition or radio frequency interference.
- Defective trigger circuit in anti-lock brake electronic control module.

37
43
57
77 Rear Axle Speed Sensor Diagnosis (Dynamic)
Possible Source(s):
- Damaged/missing indicator ring teeth or missing indicator ring.
- Air gap too small or too large.
- Excessive axle vibration.
- Weak rear axle sensor.
- Loose rear axle sensor.
- Disturbances caused by ignition or radio frequency interference.
- Defective trigger circuit in anti-lock brake electronic control module.
- Intermittent short or open in Circuit 518 (LG/R) or 519 (LG/BK). Note: Some vehicles were built using Circuit 523 (R/PK) in place of 518 (LG/R).

51 Hydraulically Inoperative Front Left Outlet Valve or Sensor Disturbance Detected
Possible Source(s):
- Pinched or closed brake line or hose.
- Worn or clogged front left outlet valve.

52 Hydraulically Inoperative Right Front Outlet Valve or Sensor Disturbance Detected
Possible Source(s):
- Pinched or closed brake line or hose.
- Worn or clogged front right outlet valve.

53 Hydraulically Inoperative Rear Axle Outlet Valve or Sensor Disturbance Detected
Possible Source(s):
- Pinched or closed brake line or hose.
- Worn or clogged rear axle outlet valve.

63 Pump Motor Triggered but Did Not Run
Possible Source(s):
- Damaged pump motor.
- Terminal backout in anti-lock brake electronic control module harness connector Pins 17, 29, 37 and 38.
- Open or shorted pump motor relay coil.
- Open contacts in pump motor relay.
- Terminal backout in pump motor 4-way, Pins 1, 2, 3 or 4.

65 Acceleration Sensor
Possible Source(s):
- Terminal backout in anti-lock brake electronic control module wiring harness connector Pins 30, 31 and 32.
- Worn or damaged acceleration switch.
- Worn or damaged anti-lock brake electronic control module.
- Acceleration switch terminal backout, Pins 1, 2 and 3.
- Short to ground in Circuits 836 (O/W), 886 (O/BK) and 887 (Y).

67 Pump Motor Running but Not Triggered
Possible Source(s):
- Damaged trigger circuit in anti-lock brake electronic control module.
- Terminal backout in anti-lock brake electronic control module harness connector Pins 2 and 3.
- Welded relay contacts.
- Short to ground in Circuit 539 (PK/LB).

-- Amber ABS Warning Lamp On, No Code
Possible Source(s):
- Worn or damaged ignition switch.
- Open ignition feed circuit to anti-lock brake electronic control module.
- Low battery voltage (less than 8V).
- Blown ignition fuse.
- Open system ground.

ABS and Speedometer Are Not Functioning Properly
Possible Source(s):
- No signal to anti-lock brake electronic control module from vehicle speed sensor.
- No signal to speedometer from anti-lock brake electronic control module.
- Defective vehicle speed sensor.

Unwarranted ABS Activity
Possible Source(s):
- Tone ring is damaged.
Action(s) to take:
- INSPECT both front brake anti-lock sensor indicators and the rear axle tone ring.
Possible Source(s):
- Sensor output is weak.
Action(s) to take:
- Left front brake anti-lock sensor -- GO to -Pinpoint Test L-.
- Right front brake anti-lock sensor -- GO to -Pinpoint Test M-.
- Rear axle sensor -- GO to -Pinpoint Test N-.
Possible Source(s):
- Intermittent open or shorted sensor circuit.
- Intermittent open sensor circuit at intermediate connections especially bulkhead.
Possible Source(s):
- Chafed wire insulation or pinched wire due to improper routing causing intermittent short.
Action(s) to take:
- INSPECT wiring harness from front brake anti-lock sensors on knuckle to the frame and from the rear axle to the frame for worn or chafed wire insulation.
Possible Source(s):
- Rear brake adjustment too tight.
- Linings are "grabby".

Wheels Lock Up
Possible Source(s):
- Hydraulic outlet (dump) valve.
- Damp or contaminated rear brake shoe linings, stuck/leaking wheel cylinder, overadjusted rear brakes.
- Hung-up parking brake.
- Leaking rear axle seal.

Hard or Soft Brake Pedal
Possible Source(s):
- Stuck shut inlet (isolation) valve (hard) or leaky outlet (dump) valve (soft).
- Leaky inlet (isolation) valve during ABS (soft).
- Hydraulic leak in brake line or hose, fitting, brake master cylinder, wheel cylinder, or caliper.
- Air in brake system.
- Little or no vacuum boost.
- Stuck or inoperative wheel cylinder or caliper.
- Pinched or crimped brake line or hose.

Lack of Deceleration During Medium/Hard Brake Application
Possible Source(s):
- Stuck shut inlet (isolation) valve or leaky outlet (dump) valve -- rear axle ONLY.
Possible Source(s):
- Hydraulic leak in brake line or hose, fitting, brake master cylinder, wheel cylinder, or caliper.
- Air in brake system.
- Little or no vacuum boost.
- Stuck or inoperative wheel cylinder or caliper.
- Pinched or crimped brake line or hose.
- Ineffective brake shoe or pad linings.

Vehicle Pulls During Braking
Possible Source(s):
- Fully or partially blocked right front inlet (isolation) valve.
- Fully or partially blocked left front inlet (isolation) valve.
- Improperly adjusted rear brake.
- Frozen or binding caliper (one side of vehicle).
- Uneven brake pad or shoe wear.
- Pinched or crimped brake line or hose.

ABS Warning Light On Intermittently with Code 16
Possible Source(s):
- Ignition circuit 601 loose.
- INSPECT Circuit 601 harness from ignition switch to anti-lock brake electronic control module harness connector for opens/shorts especially at the bulk-head connector. CORRECT as necessary.
Possible Source(s):
- Loose anti-lock brake electronic control module grounds.
Action(s) to take:
- INSPECT anti-lock brake electronic control module grounds for looseness, corrosion or excessive dirt. CORRECT as necessary.
Possible Source(s):
- Loose power log at power distribution box.
Action(s) to take:
- CORRECT and REPAIR as necessary.
Possible Source(s):
- Low battery/charging system.
Action(s) to take:
- VERIFY ABS warning light does not come on at idle with high electrical loads.
==
4WABS Self Test Connector pic in 93-96 (near driver's side hood hinge)
Source: by s8c2 (the wagon) at SuperMotors.net
 




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