Pinpoint Test D: No Power In Start
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- D1 CHECK THE VOLTAGE SUPPLY TO THE IGNITION SWITCH
- Key in OFF position.
- Disconnect: Ignition Switch C250.
- Measure the voltage between the ignition switch circuits and ground, as follows:IGNITION SWITCH CIRCUITS
Ignition Switch C250 Circuit C250-2 325 (DB/OG) C250-9 1050 (LG/PK) - Are the voltages greater than 10 volts?
- Yes : GO to D2.
- No : REPAIR the circuit(s) in question. TEST the system for normal operation.
- D2 CHECK CIRCUIT 16 (RD/LG) FOR AN OPEN
- Measure the resistance between the ignition switch C250-1, circuit 16 (RD/LG), harness side and the CJB C270c-4, circuit 16 (RD/LG), harness side.
- Is the resistance less than 5 ohms?
- Yes : GO to D3.
- No : REPAIR the circuit. TEST the system for normal operation.
- D3 CHECK CIRCUIT 1522 (DG) FOR AN OPEN
- Measure the resistance between the ignition switch C250-5, circuit 1522 (DG), harness side and the CJB C270b-8, circuit 1522 (DG), harness side.
- Is the resistance less than 5 ohms?
- Yes : GO to D4.
- No : REPAIR the circuit. TEST the system for normal operation.
- D4 CHECK THE IGNITION SWITCH
- Carry out the Ignition Switch Continuity Check. Refer to COMPONENT TESTING - F250-F550 SUPER DUTY PICKUP .
- Does the ignition switch test OK?
- Yes : REFER to STARTING SYSTEM - GASOLINE ENGINES or STARTING SYSTEM - DIESEL ENGINE to diagnose the starting system.
- No : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.