Pinpoint Test E: DTC B2426, B2427, B2795 Or B2796

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

E1 CHECK THE SUNLOAD SENSOR REFERENCE VOLTAGE
- Ignition OFF.
- Disconnect: Sunload Sensor C286.
- Ignition ON.
- Press the AUTO button.
- Measure the voltage between sunload sensor C286-4, circuit GD115 (BK/GY), harness side and:
  - DTC B2426 or B2427 , C286-1, circuit VH416 (VT/GY), harness side.
  - DTC B2795 or B2796 , C286-3, circuit VH417 (YE/OG), harness side.
    
    Fig 1: Measuring Voltage Between Sunload Sensor C286-4, Circuit GD115 (BK/GY)
    Courtesy of FORD MOTOR CO.
- Are the voltages between 4.7 and 5.1 volts?
- Yes: INSTALL a new sunload sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the DTC returns, GO to E5.
- No: For DTC B2426 or B2796 , GO to E2 .
  For DTC B2427 or B2795 , GO to E4.
E2 CHECK CIRCUIT GD115 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between sunload sensor C286-4, circuit GD115 (BK/GY), harness side and ground.
  
  Fig 2: Measuring Resistance Between Sunload Sensor C286-4, Circuit GD115 (BK/GY) And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to E3 .
- No: REPAIR circuit GD115 (BK/GY) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
E3 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR AN OPEN
- Disconnect: HVAC Module - DATC C228A.
  DTC B2426
  
  Fig 3: Measuring Resistance Between HVAC Module - DATC C228A-4, Circuit VH416 (VT/GY) And Sunload Sensor C286-1, Circuit VH416 (VT/GY)
  Courtesy of FORD MOTOR CO.
- For DTC B2426 , measure the resistance between HVAC module - DATC C228A-4, circuit VH416 (VT/GY), harness side and sunload sensor C286-1, circuit VH416 (VT/GY), harness side.
  DTC B2796
  
  Fig 4: Measuring Resistance Between HVAC Module - DATC C228A-5, Circuit VH417 (YE/OG) And Sunload Sensor C286-3, Circuit VH417 (YE/OG)
  Courtesy of FORD MOTOR CO.
- For DTC B2796 , measure the resistance between HVAC module - DATC C228A-5, circuit VH417 (YE/OG), harness side and sunload sensor C286-3, circuit VH417 (YE/OG), harness side.
- Are the resistances less than 5 ohms?
- Yes: GO to E5.
- No: REPAIR circuit VH417 (YE/OG) or VH416 (VT/GY) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
E4 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module - DATC C228A.
- Measure the resistance between ground and:
  - DTC B2427 , sunload sensor C286-1, circuit VH416 (VT/GY), harness side.
  - DTC B2795 , sunload sensor C286-3, circuit VH417 (YE/OG), harness side.
    
    Fig 5: Measuring Resistance Between Sunload Sensor C286-1, Circuit And Ground
    Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes: GO to E5 .
- No: REPAIR circuit VH417 (YE/OG) or VH416 (VT/GY) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
E5 CHECK THE HVAC MODULE CONNECTION
- Inspect the HVAC module connectors for:
  - corrosion.
  - pushed-out terminals.
  - damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
- 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. TEST the system for normal operation.