Pinpoint Test C: No Power In Run
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
- C1 ISOLATE THE RUN CIRCUIT
- Ignition In ACC.
- Operate the windshield wipers.
- Do the windshield wipers operate?
- Yes: GO to C2 .
- No: GO to PINPOINT TEST B .
- C2 CHECK THE RUN/START CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Disconnect: Smart Junction Box (SJB) C2280B.
- Disconnect: SJB C2280E.
- Disconnect: PCM C175B.
- Disconnect: Battery Junction Box (BJB) Fuse 35 (5A).
- Disconnect: BJB Fuse 25 (5A).
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and:
- SJB C2280B-45, circuit CDC34 (WH/OG), harness side.
- SJB C2280E-1, circuit CDC34 (WH/OG), harness side.
- PCM C175B-42, circuit CDC34 (WH/OG), harness side.
- BJB fuse 35 (5A), circuit CDC34 (WH/OG), input side.
- BJB fuse 25 (5A), circuit CDC34 (WH/OG), input side.
- Are the resistances less than 5 ohms?
- Yes:
VERIFY BJB
fuses 35 (5A) and 25 (5A) are OK.
If the fuse(s) is OK, GO to C3 .
If the fuse(s) is not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the cause of the circuit short. TEST the system for normal operation.
- No: REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
- C3 CHECK THE RUN/START CIRCUIT FOR SHORT TO GROUND
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to C4 .
- No: REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
- C4 CHECK THE PCM FOR SHORT TO GROUND
- Connect: PCM C175B.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to C5 .
- No: GO to C6.
- C5 CHECK THE SJB FOR SHORT TO GROUND
- Connect: SJB C2280B.
- Connect: SJB C2280E.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes:
INSPECT the ignition switch connector for pushed-out pins, spread and bent terminals. REPAIR as necessary.
If the connector is OK, INSTALL a new ignition switch. REFER to REMOVAL AND INSTALLATION .
TEST the system for normal operation.
- No: GO to C7.
- C6 CHECK FOR CORRECT PCM OPERATION
- Disconnect: All PCM Connectors.
- Check the connectors for:
- corrosion.
- spread terminals.
- pushed-out pins.
- Connect: All PCM Connectors.
- Connect: All SJB Connectors.
- Connect: All SJB Fuses.
- Connect: Ignition Switch C250.
- Make sure the connectors seat properly, then operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new PCM. Refer to the POWERTRAIN CONTROL MODULE (PCM) ,POWERTRAIN CONTROL MODULE (PCM) ,POWERTRAIN CONTROL MODULE (PCM) for the procedure. 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. TEST the system for normal operation.
- C7 CHECK FOR CORRECT SJB OPERATION
- Disconnect: SJB C2280B.
- Disconnect: SJB C2280E.
- Check the connectors for:
- corrosion.
- spread terminals.
- pushed-out pins.
- Connect: All PCM Connectors.
- Connect: All SJB Connectors.
- Connect: All SJB Fuses.
- Connect: Ignition Switch C250.
- Make sure the connectors seat properly, then operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new SJB . REFER to REMOVAL AND INSTALLATION . 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. TEST the system for normal operation.