PINPOINT TEST AM: DTCs C0031:13, C0031:17, C0031:23 (LF), C0034:13, C0034:17, C0034:23 (RF), C0037:13, C0037:17, C0037:23 (LR), C003A:13, C003A:17, C003A:23 (RR)

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

AM1 CHECK FOR FAULT REPEATABILITY
- Ignition ON.
- Using a scan tool, clear the ABS module DTCs.
- Drive the vehicle at least 20 km/h (12 mph).
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Is the DTC still present?
  1. Yes : If the Rotunda Active Wheel Speed Sensor Tester is available, GO to AM2. If the Rotunda Active Wheel Speed Sensor Tester is not available, GO to AM4.
  2. No : INSPECT the wheel speed sensors and wheel speed sensor wiring. REPAIR or INSTALL new as necessary. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) , Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) or Wheel Speed Sensor - Rear, Four-Channel .
AM2 CHECK THE ABS MODULE OUTPUT USING THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER
- Ignition OFF.
- Disconnect: Suspect Wheel Speed Sensor.
- Connect the Rotunda Active Wheel Speed Sensor Tester to the wheel speed sensor connectors.
- Ignition ON.
- Select the correct system polarity on the Rotunda Active Wheel Speed Sensor Tester and turn the power switch to the ON position.
- Is the module output LED illuminated?
  1. Yes : GO to AM3.
  2. No : GO to AM5.
AM3 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER
- Raise the suspect wheel until it can spin freely. Refer to JACKING & LIFTING .
- While monitoring the Rotunda Active Wheel Speed Sensor Tester, slowly spin the suspect wheel.
- Do the sensor output LEDs illuminate and flash and is the current overload LED not illuminated?
  1. Yes : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  2. No : If the current level LED is not illuminated and the sensor output LEDs do not illuminate or if the current level LED is illuminated red, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) , Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) or Wheel Speed Sensor - Rear, Four-Channel . CLEAR the DTCs. REPEAT the self-test.
    If the current level LED is not illuminated and the sensor output LEDs illuminate green, but do not flash, INSPECT the tone ring(s) and INSTALL new if necessary. For front wheel speed sensor tone rings, REFER to Wheel Bearing and Wheel Hub Removal and Installation in WHEEL BEARING AND WHEEL HUB (RWD) -- F450 & F550 or WHEEL BEARING AND WHEEL HUB (4WD) -- F450 & F550 . For rear wheel speed sensor tone rings, REFER to Wheel Speed Sensor Ring - Rear, Four-Channel . If the tone ring(s) are OK, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) , Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) or Wheel Speed Sensor - Rear, Four-Channel . CLEAR the DTCs. REPEAT the self-test.

AM4 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO BATTERY VOLTAGE

Ignition OFF.
Disconnect: ABS Module C135.
Disconnect: Suspect Wheel Speed Sensor.
Ignition ON.

Measure the voltage between the suspect wheel speed sensor connector, harness side and ground as follows:

Wheel Speed Sensor Location	Wheel Speed Sensor	Circuit
LF	C150-1	VCA03 (VT/WH)
LF	C150-2	RCA17 (YE)
RF	C160-1	VCA05 (GY/VT)
RF	C160-2	RCA19 (VT)
LR	C440-1	RCA21 (BN/GN)
LR	C440-2	VCA07 (BU/OG)
RR	C426-1	VCA06 (WH/OG)
RR	C426-2	RCA20 (BN)

Fig 1: Measuring Voltage Between Suspect Wheel Speed Sensor Connector, Harness Side And Ground

Courtesy of FORD MOTOR CO.

Is any voltage present?
1. Yes : REPAIR the affected circuit(s) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
2. No : GO to AM5.

AM5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: ABS Module C135.

Measure the resistance between the suspect wheel speed sensor connector, harness side and ground as follows:

Wheel Speed Sensor Location	Wheel Speed Sensor	Circuit
LF	C150-1	VCA03 (VT/WH)
LF	C150-2	RCA17 (YE)
RF	C160-1	VCA05 (GY/VT)
RF	C160-2	RCA19 (VT)
LR	C440-1	RCA21 (BN/GN)
LR	C440-2	VCA07 (BU/OG)
RR	C426-1	VCA06 (WH/OG)
RR	C426-2	RCA20 (BN)

Fig 2: Measuring Resistance Between Suspect Wheel Speed Sensor Connector, Harness Side And Ground

Courtesy of FORD MOTOR CO.

Are the resistances greater than 10,000 ohms?
1. Yes : GO to AM6.
2. No : REPAIR the affected circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test.

AM6 CHECK THE WHEEL SPEED CIRCUITS FOR AN OPEN

Disconnect: Suspect Wheel Speed Sensor.

Measure the resistance between ABS module connector C135, harness side and the suspect wheel speed sensor connector, harness side as follows:

Wheel Speed Sensor Location	ABS Module	Circuit	Wheel Speed Sensor
LF	C135-27	VCA03 (VT/WH)	C150-1
LF	C135-28	RCA17 (YE)	C150-2
RF	C135-3	VCA05 (GY/VT)	C160-1
RF	C135-4	RCA19 (VT)	C160-2
LR	C135-36	RCA21 (BN/GN)	C440-1
LR	C135-35	VCA07 (BU/OG)	C440-2
RR	C135-11	VCA06 (WH/OG)	C426-1
RR	C135-10	RCA20 (BN)	C426-2

Fig 3: Measuring Resistance Between ABS Module Connector C135 And Suspect Wheel Speed Sensor Connector

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?
1. Yes : GO to AM7.
2. No : REPAIR the affected circuit(s) for an open circuit. CLEAR the DTCs. REPEAT the self-test.

AM7 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS

Measure the resistance between the suspect wheel speed sensor connector, harness side as follows:

Wheel Speed Sensor Location	Wheel Speed Sensor	Circuit	Wheel Speed Sensor
LF	C150-1	VCA03 (VT/WH)/RCA17 (YE)	C150-2
RF	C160-1	VCA05 (GY/VT)/RCA19 (VT)	C160-2
LR	C440-1	RCA21 (BN/GN)/VCA07 (BU/OG)	C440-2
RR	C426-1	VCA06 (WH/OG)/RCA20 (BN)	C426-2

Fig 4: Measuring Resistance Between Suspect Wheel Speed Sensor Connector, Harness Side

Courtesy of FORD MOTOR CO.

Is the resistance greater 10,000 ohms?
1. Yes : GO to AM8.
2. No : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

AM8 CHECK FOR CORRECT ABS MODULE OUTPUT

Connect: ABS Module C135.
Ignition ON.

Measure the voltage between the suspect wheel speed sensor connector, harness side.

Wheel Speed Sensor Location	Wheel Speed Sensor	Circuit	Wheel Speed Sensor
LF	C150-1	VCA03 (VT/WH)/RCA17 (YE)	C150-2
RF	C160-1	VCA05 (GY/VT)/RCA19 (VT)	C160-2
LR	C440-1	RCA21 (BN/GN)/VCA07 (BU/OG)	C440-2
RR	C426-1	VCA06 (WH/OG)/RCA20 (BN)	C426-2

Fig 5: Measuring Voltage Between Suspect Wheel Speed Sensor Connector, Harness Side

Courtesy of FORD MOTOR CO.

Is the voltage greater than 10 volts?
1. Yes : INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) , Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) or Wheel Speed Sensor - Rear, Four-Channel . CLEAR the DTCs. REPEAT the self-test.
2. No : GO to AM9.

AM9 CHECK THE WHEEL SPEED SENSOR OUTPUT
- Ignition OFF.
- Disconnect: Wheel Speed Sensor C150.
- For LF wheel DTCs , connect a fused jumper wire between LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor C150, pin 1, circuit VCA03 (VT/WH), component side.
  
  Fig 6: Connecting Fused Jumper Wire Between LF Wheel Speed Sensor C150-1 And LF Wheel Speed Sensor C150, Pin 1
  Courtesy of FORD MOTOR CO.
- Connect the automotive meter between LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side and LF wheel speed sensor C150, pin 2, circuit RCA17 (YE), component side.
- For RF wheel DTCs , connect a fused jumper wire between RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor C160, pin 1, circuit VCA05 (GY/VT), component side.
  
  Fig 7: Connecting Fused Jumper Wire Between RF Wheel Speed Sensor C160-1 And RF Wheel Speed Sensor C160, Pin 1
  Courtesy of FORD MOTOR CO.
- Connect the automotive meter between RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side and RF wheel speed sensor C160, pin 2, circuit RCA19 (VT), component side.
- For LR wheel DTCs , connect a fused jumper wire between LR wheel speed sensor C440-1, circuit VCA07 (BU/OG), harness side and LR wheel speed sensor C440, pin 1, circuit VCA07 (BU/OG), component side.
  
  Fig 8: Connecting Fused Jumper Wire Between LR Wheel Speed Sensor C440-1 And LR Wheel Speed Sensor C440, Pin 1
  Courtesy of FORD MOTOR CO.
- Connect the automotive meter between LR wheel speed sensor C440-2, circuit RCA21 (BN/GN), harness side and LR wheel speed sensor C440, pin 2, circuit RCA21 (BN/GN), component side.
- For RR wheel DTCs , connect a fused jumper wire between LF wheel speed sensor C426-1, circuit VCA06 (WH/OG) harness side and RR wheel speed sensor C426, pin 1, circuit VCA06 (WH/OG) component side.
  
  Fig 9: Connecting Fused Jumper Wire Between LF Wheel Speed Sensor C426-1 And RR Wheel Speed Sensor C426, Pin 1
  Courtesy of FORD MOTOR CO.
- Connect the automotive meter between RR wheel speed sensor C426-2, circuit RCA20 (BN), harness side and LF wheel speed sensor C426, pin 2, circuit RCA20 (BN), component side.
- Ignition ON.
- Measure the current while slightly rotating the wheel using incremental turns.
- Does the automotive meter switch between the low state (5-8 mA) and the high state (12-16 mA)?
  1. Yes : GO to AM10.
  2. No : INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) , Wheel Speed Sensor - Front, Four Wheel Drive (4WD) or Wheel Speed Sensor - Rear, Four-Channel . CLEAR the DTCs. REPEAT the self-test.
AM10 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module.
- Check for:
  - corrosion
  - pushed-out pins
  - spread terminals
- Connect: ABS Module.
- Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
- Is the concern still present?
  1. Yes : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.
  2. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.