Pinpoint Test D: No Power in START - Vehicles With an Ignition Switch

Steering Column Switches

Pinpoint Test D: No Power in START - Vehicles With an Ignition Switch

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number

Normal Operation

When the ignition switch is in the START position, voltage is sent to the One-Touch Integrated Start (OTIS) diode in the Battery Junction Box (BJB) and the PCM along circuit CDC35 (BU/WH).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Ignition switch

PINPOINT TEST D : NO POWER IN START - VEHICLES WITH AN IGNITION SWITCH

NOTICE: 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 START CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: OTIS (One-Touch Integrated Start) Diode.

- Disconnect: PCM C175B.

- Disconnect: Ignition Switch C250.

- Measure the resistance between ignition switch C250-7, circuit CDC35 (BU/WH), harness side and:
- OTIS (One-Touch Integrated Start) diode, circuit CDC35 (BU/WH), input side.

- PCM C175B-9, circuit CDC35 (BU/WH), harness side.






Are the resistances less than 5 ohms?

Yes
GO to D2.

No
REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.

D2 ISOLATE THE IGNITION SWITCH

- With the ignition in the START position, measure the resistance between ignition switch C250-4, component side and ignition switch C250-7, component side.

Is the resistance less than 5 ohms?

Yes
GO to D3.

No
INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.

D3 CHECK FOR CORRECT IGNITION SWITCH OPERATION

- Connect: OTIS (One-Touch Integrated Start) Diode.

- Connect: PCM C175B.

- Connect: Ignition Switch C250.

- Attempt to start the engine.

Does the engine crank?

Yes
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.

No
If the engine does not crank, REFER to The Engine Does Not Crank in Starting System.