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 starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid.

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.

Circuit/System Verification

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

Circuit/System Testing

1. Ignition ON, verify DTC P0615 is set as current.
2. Ignition OFF, disconnect the starter relay, test for 60-180 ohms between relay terminals 85 and 86.

• If not within the specified range, replace the starter relay.

3. Ignition OFF, test for less than 3.0 ohms between the relay ground circuit terminal 85 and ground.

• If greater than the specified range, 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.
5. Place the ignition to the start position. The test lamp should only illuminate 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 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.

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)