Pinpoint Test C: DTC 1519 - Inoperative From The Hood Ajar Switch

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

C1 VERIFY THE DTC B1519
- Key in OFF position.
- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-5, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 1: Measuring Resistance Between SJB C2280B-5 Circuit 1304 (VT/OG)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to C6.

No : GO to C2.
C2 CHECK CIRCUIT 1304 (VT/OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Hood Ajar Switch C127.
- Measure the resistance between the SJB C2280b-5, circuit 1304 (VT/OG), harness side and the hood ajar switch C127-1, circuit 1304 (VT/OG), harness side.
  
  Fig 2: Checking Circuit 1304 (VT/OG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to C3.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C3 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Measure the resistance between the hood ajar switch C127-2, circuit 570 (BK/WH), harness side and ground.
  
  Fig 3: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to C4

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C4 CHECK CIRCUIT 1304 (VT/OG) FOR VOLTAGE
- Key in OFF position.
- Connect: SJB C2280b.
- Measure the voltage between the hood ajar switch C127-1, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 4: Checking Circuit 1304 (VT/OG) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to C5

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test..
C5 CHECK THE HOOD AJAR SWITCH
- Make sure the hood is open.
- Connect: Hood Ajar Switch C127.
- Disconnect: SJB C2280b.
- With the hood open then closed and then open measure the resistance between the SJB C2280b-5, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 5: Checking Hood AJAR Switch
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms with the hood closed and greater than 10,000 ohms with the hood opened?
Yes : GO to C6.

No : INSTALL a new hood ajar switch. TEST the system for normal operation.
C6 CHECK THE SJB FOR CORRECT OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test.

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.