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.

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, engine, or automatic transmission DTCs are that would cause the ECM to not enable engine starting.

^ If any DTCs are set, go to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions

2. Clear the DTCs. Attempt to start the engine. Verify that DTC P0615 does not set.

^ If DTC P0615 sets, go to Circuit/System Testing.

3. Go to Diagnostic Aids for Circuit Testing and Wiring Repair Procedures.

Circuit/System Testing

1. Ignition OFF. Disconnect the crank relay. Test for 60-80 ohms between relay terminals 85 and 86.

^ If not within the specified range, replace the crank 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 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.

4. If all circuits test normal, 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)