PINPOINT TEST K: STABILITY CONTROL SENSOR COMMUNICATION AND SIGNAL FAILURE DTCs

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Never probe the electrical connectors on airbag, Safety Canopy or side air curtain assemblies. Failure to follow this instruction may result in the accidental deployment of these assemblies, which increases the risk of serious personal injury or death.

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

K1 CHECK FOR A HS-CAN CONCERN WITH THE RCM
- Ignition ON.
- NOTE: The network test does not test the dedicated CAN communications between the ABS module and RCM .
  
  Using the scan tool, carry out the network test.
Does the RCM pass the Network Test?
- Yes : GO to K2 .
- No : REFER to MODULE COMMUNICATIONS NETWORK to diagnose the RCM does not respond to the scan tool.
K2 VERIFY THE RCM PART NUMBER
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Log Viewer. Retrieve and record the RCM part number from the log viewer.
- Check the part number recorded against the number listed in the parts catalog.
Does the part number on the RCM match the part number listed in the parts catalog?
- Yes : GO to K3 .
- No : INSTALL the correct RCM . REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.
K3 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO VOLTAGE
- Depower the Supplemental Restraint System (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: RCM C310B .
- Disconnect: ABS Module C135 .
- Ignition ON.
- Measure the voltage between ground and:
  - ABS module C135-19 , circuit VCA24 (GN/OG), harness side.
  - ABS module C135-18 , circuit VCA23 (BU/WH), harness side.
    
    Fig 1: Measuring Voltage Between Ground And ABS Module C135-19, Circuit VCA24 (GN/OG)
    Courtesy of FORD MOTOR CO.
Is any voltage present?
- Yes : REPAIR the affected circuit(s) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
- No : GO to K4 .
K4 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between ground and:
  - ABS module C135-19 , circuit VCA24 (GN/OG), harness side.
  - ABS module C135-18 , circuit VCA23 (BU/WH), harness side.
    
    Fig 2: Measuring Resistance Between Ground And ABS Module C135-18, Circuit VCA23 (BU/WH)
    Courtesy of FORD MOTOR CO.
Are the resistances greater than 10, 000 ohms?
- Yes : GO to K5 .
- No : REPAIR the affected circuit(s). TEST the system for normal operation.
K5 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between ABS module C135-19 , circuit VCA24 (GN/OG), harness side and ABS module C135-18 , circuit VCA23 (BU/WH), harness side.
  
  Fig 3: Measuring Resistance Between ABS Module C135-19 And Circuit VCA24 (GN/OG)
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to K6 .
- No : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

K6 CHECK THE DEDICATED CAN CIRCUITS FOR AN OPEN

Measure the resistance between the ABS module C135 , harness side and the RCM C310B , harness side as follows:

ABS Module	Circuit	RCM
C135-18	VCA23 (BU/WH)	C310B-20
C135-19	VCA24 (GN/OG)	C310B-19

Fig 4: Measuring Resistance Between ABS Module C135 And RCM C310B Harness Side

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : GO to K7 .
No : REPAIR the affected circuit(s). CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.

K7 CHECK FOR CORRECT RCM OPERATION
- Disconnect: RCM C310B .
- Check for:
  - corrosion
  - pushed-out pins
  - spread terminals
- Connect: RCM C310B .
- Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
Is the concern still present?
- Yes : INSTALL a new RCM . REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test. If DTC U0151:88 is retrieved again GO to K8
- 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.
K8 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS module C135 .
- Check for:
  - corrosion
  - pushed-out pins
  - spread terminals
- Connect: ABS module C135 .
- Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
Is the concern still present?
- Yes : For vehicles without adaptive cruise control, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.
  For vehicles with adaptive cruise control, INSTALL a new HCU . REFER to HYDRAULIC CONTROL UNIT (HCU) .
- 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.