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 clutch is depressed for the manual transmission or that the automatic transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the switch of the STRTR relay to the S terminal of the starter solenoid. The ECM monitors the voltage on the starter relay control circuit. If the ECM detects that the starter relay control circuit is open or shorted, 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 starter 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
* Verify that the ground connection for the starter relay ground circuit is clean and tight.
* Inspect the terminals for the starter relay in the underhood fuse block for poor connections.
* Test and/or replace the starter relay.
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 cause the ECM to disable starting, then go to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
2. Start the engine. Verify that DTC P0615 is set as current.
• If DTC P0615 is not current, go to Diagnostic Aids.
3. Go to Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF, disconnect the STRTR relay, test for 60-180 ohms of resistance between relay terminals 85 and 86.
• If not within the specified range, replace the STRTR relay.
2. Test for less than 1.0 ohm between the relay ground circuit terminal 85 and the negative battery terminal.
• If greater than the specified value, 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. Turn the ignition to the start position. The test lamp should turn ON when the ignition is in the START position, and OFF in all other positions.
• 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.
4. If all circuits test normal, go to Diagnostic Aids.
Component Testing
STRTR Relay
1. Ignition OFF, disconnect the STRTR relay.
2. Test for 60-180 ohm between terminals 85 and 86.
• If not within the specified range, replace the STRTR 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 STRTR 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 STRTR 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)