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






Typical Scan Tool Data






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 CRNK 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 ON.
* 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 CRNK 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 G107. 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. Observe the Starter Relay Circuit Status scan tool parameter in the ECM Electrical/Theft data list. Verify that the scan tool displays the status is Incomplete.

• If the scan tool displays a blank or a circuit fault, then refer to Circuit/System Testing.

3. Refer to Diagnostic Aids.

Circuit/System Testing

1. Ignition OFF, disconnect the CRNK relay.
2. Test for 60-100 ohms between relay terminals 85 and 86.

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

3. Probe the the relay ground circuit left front terminal 85 with a test lamp that is connected to B+. The test lamp should illuminate.

• If the test lamp does not illuminate, then test the ground circuit for an open/high resistance.

4. Ignition OFF, connect a test lamp between the right rear control circuit terminal 86 and the ground circuit left front terminal 85. Turn the ignition to the start position. The test lamp should illuminate for a maximum of 10 seconds when the ignition is held in the start position.

• If the test lamp is ON when the ignition is not in the start position, 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 CRNK relay. Attempt to start the vehicle. Verify that DTC P0615 does not set.

• If DTC P0615 sets again, replace the ECM.

Component Testing

CRNK Relay

1. Ignition OFF, disconnect the CRNK 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 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 ohms 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)