P0615
DTC P0615
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0615
- Starter Relay Control Circuit
Diagnostic Fault Information
Circuit/System Description
When the ignition 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 transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the crank relay. When this occurs, battery voltage is supplied through the switch of the crank relay to S terminal of the starter solenoid. The ECM monitors the voltage on the starter relay control circuit. If the voltage is not what is expected, then DTC P0615 sets.
Conditions for Running the DTC
* The Ignition is in the START position.
* The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM detects improper voltage on the control circuit of the crank relay.
Action Taken When the DTC Sets
DTC P0615 is a C type DTC.
Conditions for Clearing the DTC
DTC P0615 is a C type DTC.
Circuit/System Verification
1. Ignition ON. Verify that no theft deterrent or automatic transmission DTCs are set that would cause the ECM to disable engine starting.
• If any DTCs are set that would inhibit engine starting, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
2. Attempt to start the engine. Verify that DTC P0615 is set as current.
• If DTC P0615 is not current, Refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
3. Refer to Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF, disconnect the crank relay.
2. Test for 60-80 ohms between relay terminals 85 and 86.
• If not within the specified range, replace the crank relay.
3. Test for less than 1.0 ohm between the relay ground circuit terminal 85 and the negative terminal of the battery.
• If greater than the specified value, test the ground circuit for an open/high resistance.
4. Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85. Turn the ignition to the start position. The test lamp should illuminate only when the ignition is held in the start position.
• If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests 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 circuit tests normal, replace the ECM.
5. Replace the CRANK relay. Attempt to start the vehicle. Verify that DTC P0615 does not set.
• If DTC P0615 sets again, replace the ECM.
Component Testing
Crank Relay
1. Ignition OFF, disconnect the crank relay.
2. Test for 60-180 ohm between terminals 85 and 86.
• If not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If not the specified value, replace the relay.
4. Install a 20 amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohm between terminals 30 and 87.
• If greater than specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)