Anti-Lock Brake System (ABS) C155

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Anti-Lock Brake System (ABS) C155

Courtesy of FORD MOTOR CO.

CIRCUIT DESIGNATION/DESCRIPTION

Pin Number(s)	Circuit Designation/Description	Normal Condition/Measurement
1	534 (YE/LG) hydraulic control unit (HCU) pump power	B+ voltage at all times.
3	1572 (DG) steering wheel rotation sensor angle 1	0 volts. Greater than 10,000 ohms between the ABS module and ground. Less than 5 ohms between the ABS module and the steering wheel rotation sensor.
4	601 (LB/PK) ignition power	Greater than 10 volts with the ignition switch on.
5	1577 (RD/LB) steering wheel rotation sensor ground	0 volts. Greater than 10,000 ohms between the ABS module and ground. Less than 5 ohms between the ABS module and the steering wheel rotation sensor.
6	1573 (YE) steering wheel rotation sensor angle 2	0 volts. Greater than 10,000 ohms between the ABS module and ground. Less than 5 ohms between the ABS module and the steering wheel rotation sensor.
7	1576 (TN/BK) steering wheel rotation sensor/accelerometer/yaw rate sensor power	0 volts. Greater than 10,000 ohms between the ABS module and ground. Less than 5 ohms between the ABS module and the steering wheel rotation sensor.
13	960 (BK/LB) stability assist OFF indicator	Greater than 10 volts with the ignition switch on. Less than 5 ohms between the ABS module and the stability assist switch.
16	274 (BK/WH) ABS module ground	0 volts, less than 5 ohms between the ABS module and ground.
17	1582 (LG/RD) active brake booster power	0 volts, less than 5 ohms between the ABS module and the active brake booster. Greater than 10,000 ohms between the ABS module and ground.
18	3601 (WH/RD) brake pressure transducer power	0 volts, less than 5 ohms between the ABS module and the brake pressure transducer. Greater than 10,000 ohms between the ABS module and ground.
19	3603 (RD) brake pressure transducer ground	0 volts, less than 5 ohms between the ABS module and the brake pressure transducer. Greater than 10,000 ohms between the ABS module and ground.
20	3600 (RD/WH) brake pressure transducer signal	0 volts, less than 5 ohms between the ABS module and the brake pressure transducer. Greater than 10,000 ohms between the ABS module and ground.
24	3011 (BK/OG) brake pedal travel sensor ground	0 volts, less than 5 ohms between the ABS module and the brake pedal travel sensor. Greater than 10,000 ohms between the ABS module and ground.
25	1879 (PK/BK) sensor cluster CAN Bus (-)	0 volts, less than 5 ohms between the ABS module and the sensor cluster. Greater than 10,000 ohms between the ABS module and ground.
26	3010 (TN) brake pedal travel sensor power	0 volts, less than 5 ohms between the ABS module and the brake pedal travel sensor. Greater than 10,000 ohms between the ABS module and ground.
27	1581 (PK/LB) brake pedal force switch normally open (NO)	0 volts, less than 5 ohms between the ABS module and the active brake booster. Greater than 10,000 ohms between the ABS module and ground.
28	1579 (OG/RD) brake pedal force switch signal	0 volts, less than 5 ohms between the ABS module and the active brake booster. Greater than 10,000 ohms between the ABS module and ground.
29	1878 (WH/BK) sensor cluster CAN Bus (+)	0 volts, less than 5 ohms between the ABS module and the sensor cluster. Greater than 10,000 ohms between the ABS module and ground.
30	1580 (WH/LG) brake pedal force switch normally closed (NC)	0 volts, less than 5 ohms between the ABS module and the active brake booster. Greater than 10,000 ohms between the ABS module and ground.
31	1583 (BN/WH) active brake booster power	0 volts, less than 5 ohms between the ABS module and the active brake booster. Greater than 10,000 ohms between the ABS module and ground.
32	493 (BK/PK) HCU valve power	Greater than 10 volts with the ignition switch in any position.
33	514 (YE/RD) RF active wheel speed sensor power	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
34	516 (YE/BK) RF active wheel speed sensor ground	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
36	518 (LG/RD) LH rear (or axle) active wheel speed sensor power	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
37	519 (LG/BK) LH rear (or axle) active wheel speed sensor ground	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
38	959 (GY) stability assist switch input	0 volts, greater than 10 volts with stability assist switch pressed. Less than 5 ohms between the ABS module and the stability assist switch.
40 (ABS only)	307 (BK/YE) brake pressure switch signal	Greater than 10 volts with the brake pedal released and the ignition switch on. 0 volts when the brake pedal is pressed. Less than 5 ohms between the ABS module and the speed control deactivator switch.
40 (ABS with stability assist)	3012 (WH) brake pedal travel sensor signal	0 volts, less than 5 ohms between the ABS module and the Brake pedal travel sensor. Greater than 10,000 ohms between the ABS module and ground.
41	511 (LG) stoplamp switch input	0 volts with the brake pedal released, greater than 10 volts with the brake pedal pressed.
42	524 (PK/BK) RH rear active wheel speed sensor ground	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
43	523 (RD/PK) RH rear active wheel speed sensor power	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
44	810 (RD/LG) driver brake apply signal (to trailer tow relay)	0 volts, less than 5 ohms between the ABS module and the PCM.
45	522 (TN/BK) RH rear active wheel speed sensor ground	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
46	521 (TN/OG) LH front active wheel speed sensor power	CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result. 0 volts, less than 5 ohms between the ABS module and the wheel speed sensor. Greater than 10,000 ohms between the ABS module and ground.
47	530 (LG/YE) ABS module ground	0 volts, less than 5 ohms between the ABS module and ground.