When the ignition mode switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch is fully depressed or the automatic transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the crank relay. When this occurs, battery voltage is supplied through the switch of the crank relay to the starter solenoid.

The ECM detects improper voltage on the control circuit of the crank relay.

DTC P0615 is a C type DTC.

DTC P0615 is a C type DTC.

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Starting System Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify that no clutch pedal position sensor, brake pedal position sensor, theft deterrent or automatic transmission DTCs are set that would cause the ECM not to enable engine starting.

1. Ignition OFF, disconnect the crank relay.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1  minute. Test for less than 5.0 Ω between the relay ground circuit terminal 85 and ground.

⇒	If greater than the specified range, test the relay ground circuit for an open/high resistance.

3. Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
4. With the transmission range selector in park or neutral, cycle the ignition between the OFF and CRANK position. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always On, test the control circuit for short to voltage. If the circuits test normal replace the ECM.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal replace the ECM.

5. If all circuits tests normal, replace the crank relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.