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

WARNING: Never probe the electrical connectors on air bag, Safety Canopy® or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, 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.
- 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: Checking Dedicated CAN Circuits For Short To Voltage
  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: Checking Dedicated CAN Circuits For Short To Ground
  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: Checking Dedicated CAN Circuits For Short Together
  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: Checking Dedicated CAN Circuits For Open

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.