Test A: The Engine Does Not Crank

PINPOINT TEST A: THE ENGINE DOES NOT CRANK

A1:

A1-A6:

A7-A9:

A10-A12:

A12-A13:

A13-A14:

A15-A17:

A17-A18:

A19-A20:

A20 Continued:

A20-A21:

A21-A22:

A22 Continued:

Normal Operation
Under normal operation, the battery junction box (BJB) supplies constant power to the starter motor relay through fuse F101 (30A). When the key is placed in the START position, power is sent to the BJB through circuit 0032 (RD/LB). Power continues through circuit 1522 (DG) to the PCM and to the starter diode.

On vehicles equipped with an automatic transmissions, with the vehicle in PARK or NEUTRAL, the transmission range (TR) sensor provides power from the starter diode circuit 0325 (DB/OG) to the start relay through circuit 1093 (TN/RD).

On vehicles equipped with a manual transmission, a jumper connects circuit 0325 (DB/OG) to circuit 1093 (TN/RD). With the clutch pedal fully depressed the clutch pedal position (CPP) switch provides a signal to the PCM through circuit 1903 (WH/BK).

The PCM then provides ground on circuit 1785 (LG/VT) to the starter motor relay. The coil of the relay is energized and sends power to the starter motor on circuit 0113 (YE/LB). The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the flywheel/flexplate ring gear and closes the solenoid contacts allowing power directly from the battery through circuit 2037 (RD) to the starter motor to start the engine.

On automatic transmission equipped vehicles, the PCM will disengage the starter motor based on rpm threshold, a set time has been exceeded or the ignition key has been turned to the OFF position.

On manual transmission equipped vehicles, one-touch integrated start (OTIS) is disabled and the starter motor is disengaged when the key is released from the START position.

This pinpoint test is intended to diagnose the following:
- Anti-theft system
- Battery
- Circuitry
- Fuse(s)
- Ignition switch
- PCM
- Start diode
- Starter motor
- Starter motor relay
- TR sensor - automatic transmission