Pinpoint Test B: No Power In Acc/Run

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

B1 RETRIEVE THE SJB DTCS
- Connect the diagnostic tool.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: SJB Self-Test.
- Carry out the SJB self-test.
- Record the SJB continuous DTCs.
- Is DTC B1359 or B1555 present?
Yes : If only DTC B1359 is present, GO to B2.

If only DTC B1555 is present, GO to B3.

If both DTCs are present, GO to D4.

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.
B2 CHECK CIRCUIT 297 (BK/LG) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280a.
- Disconnect: Ignition Switch C250.
- Measure the resistance between ignition switch C250-6 circuit 297 (BK/LG), harness side and SJB C2280a-16 circuit 297 (BK/LG), harness side; and between ignition switch C250-6 circuit 297 (BK/LG), harness side and ground.
  
  Fig 1: Checking Circuit 297 (BK/LG) For An Open Or A Short To Ground
- Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground?
Yes : GO to B4.

No : REPAIR circuit 297 (BK/LG) for an open or short to ground. CLEAR the DTCs. REPEAT the self-test.
B3 CHECK CIRCUIT 1050 (LG/VT) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280a.
- Disconnect: Ignition Switch C250.
- Measure the resistance between ignition switch C250-1 circuit 1050 (LG/VT), harness side and SJB C2280a-7 circuit 1050 (LG/VT), harness side; and between ignition switch C250-1 circuit 1050 (LG/VT), harness side and ground.
  
  Fig 2: Checking Circuit 1050 (LG/VT) For An Open Or A Short To Ground
- Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground?
Yes : GO to B4.

No : REPAIR circuit 1050 (LG/VT) for an open or a short to ground. CLEAR the DTCs. REPEAT the self-test.
B4 CHECK THE IGNITION SWITCH
- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch Component Test. Refer to IGNITION SWITCH for gasoline models or IGNITION SWITCH for hybrid models .
- Is the ignition switch OK?
Yes : GO to B5.

No : INSTALL a new ignition switch. REFER to IGNITION SWITCH . CLEAR the DTCs. REPEAT the self-test.
B5 CHECK FOR CORRECT SJB 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 .

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.