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 serial data 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 START relay. When this occurs, battery voltage is supplied through the switch of the START relay to terminal A of the starter solenoid. The ECM monitors the voltage on the START 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 START 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.
Diagnostic Aids
Inspect ground connection G109. Verify that it is clean and tight.
Circuit/System Verification
1. Ignition ON, verify that no immobilizer 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. Observe the following scan tool parameters in the ECM Electrical/Theft data list. Verify that the scan tool displays the status is OK.
* Starter Relay Ckt Short Gnd Test Status
* Starter Relay Ckt Open Test Status
* Starter Relay Ckt Short Volts Test Status
Circuit/System Testing
1. Ignition OFF, disconnect the START relay.
2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal 85 and ground.
• If greater than the specified range, test the 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 key 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 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. If all circuits test normal, test or replace the START relay.
Component Testing
START Relay
1. Ignition OFF, disconnect the START relay.
2. Test for 60-100 ohms 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 20A 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 ohms between terminals 30 and 87.
• If greater than specified range, replace the START relay.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Relay Replacement (Attached to Wire Harness)