Test A: The Engine Does Not Crank/The Relay Does/Does Not Click
PINPOINT TEST A: THE ENGINE DOES NOT CRANK/THE RELAY DOES/DOES NOT CLICKNormal Operation
Under normal operation, voltage from the battery junction box (BJB) is supplied to the ignition switch through circuit SBB09 (RD). When the ignition switch is placed in the START position, voltage is supplied through circuit CDC35 (BU/WH) to smart junction box (SJB) fuse 21 (5A).
For automatic transmission equipped vehicles, voltage is supplied from SJB fuse 21 (5A) to the digital transmission range (TR) sensor through circuit CBP21 (BU/GY) and then to the starter relay coil through circuit CET 40 (GN/OG) and CBP 21 (GN/OG). A ground is supplied through circuit CDC12 (YE) and the PCM.
For manual transmission equipped vehicles, voltage is supplied from SJB fuse 21 (5A) to the starter relay coil through circuit CBP 21 (BU/GY). A ground is supplied through circuit CDC12 (YE) and the PCM. The PCM will not supply ground to the starter relay coil unless the clutch is depressed, grounding the clutch pedal position bottom of travel input to the PCM on circuit CDC 36 (GN/BN).
When the starter relay coil is energized, the relay contacts close. This allows power to be supplied from BJB fuse 7 (40A) through circuit SBB07 (WH/RD) to the relay contacts. Power then flows through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear. It also closes the solenoid contacts allowing power directly from the battery to energize the starter motor to start the engine.
This pinpoint test is intended to diagnose the following:
- Battery
- Fuse(s):
- BJB fuse 7 (40A)
- SJB fuse 21 (5A)
- Starter motor
- Ignition switch
- Circuitry
- Starter motor relay
- TR sensor (automatic transmission only)
- Clutch pedal position (CPP) switch (manual transmission only)
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