Pinpoint Test D: No Power In Start
WARNING: This page is about a different car, the 2014 Ford F-150. 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.
- D1 CHECK THE IGNITION SWITCH
- Ignition OFF.
- Disconnect: Ignition Switch C250 .
- Carry out the IGNITION SWITCH Component Test.
Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for component testing.
Is the ignition switch OK?
- Yes : REINSTALL the ignition switch and CONNECT the ignition switch connector removed during the component test. GO to D2 .
- No : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
- D2 CHECK THE START CIRCUIT TO THE BCM FOR VOLTAGE
- Ignition OFF.
- Disconnect: BCM C2280B .
- Measure the voltage between BCM C2280B-47 , circuit CDC35 (BU/WH), harness side and ground, while holding the key in the START position.
Is the voltage greater than 10 volts?
- Yes : GO to D3 .
- No : REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
- D3 CHECK THE START CIRCUIT TO THE PCM FOR VOLTAGE
- Ignition OFF.
- Disconnect: PCM C1551B (3.5L), C175B (3.7L) or C1381B (5.0L/6.2L).
- For 3.5L, measure the voltage between PCM C1551B-47 , circuit CDC35 (BU/WH), harness side and ground, while holding the key in the START position.
- For 3.7L, 5.0L and 6.2L, measure the voltage between PCM C175B-16 or C1381B-16 , circuit CDC35 (BU/WH), harness side and ground, while holding the key in the START position.
Is the voltage greater than 10 volts?
- Yes : REFER to STARTING SYSTEM to diagnose the starting system. TEST the system for normal operation.
- No : REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.