How to Fix JCB Excavator P0615-13 Starter Relay Open Circuit Fault

This guide provides step-by-step instructions for diagnosing and resolving the P0615-13 fault code related to a starter relay open circuit in JCB excavators.

Possible Causes:

1. Faulty starter relay
2. Starter relay not properly connected to the machine
3. Damaged or faulty wire harness
4. Terminal backed out from the starter relay base
5. Terminal backed out from the MECU (Machine Electronic Control Unit) wire harness connector

Diagnostic Steps:

1. Measure Starter Relay Coil Resistance
   • Use a multimeter to check the resistance of the starter relay coil.
   • The resistance should be approximately 220 ohms.
2. Verify Starter Relay Connection
   • Ensure the starter relay is securely connected to the relay box. Refer to the image below for reference.
     
3. Inspect MECU Connector Wiring
   • Check the connectivity between wire no. 8065 and wire no. 8067 at the MECU wire harness connector.
   • Look for terminal back-out or disconnection. Refer to the image below for guidance.
     
4. Inspect Relay Base Wiring
   • Check the continuity between wire no. 8065 and wire no. 8067 at the starter relay base (Relay Box).
   • Verify if terminals have backed out. See the photograph for clarification.
     

Corrective Actions:

1. Replace the Starter Relay
   • If the relay is faulty, install a new one with the correct specifications.
2. Repair or Replace the Wire Harness
   • If there’s an open circuit or terminal back-out in the wire harness, repair the damaged section or replace the entire harness as needed.

Following these steps should resolve the P0615-13 fault code and restore normal starting operation for your JCB excavator.

More topics for JCB machine,please refer to:JCB Machine Trouble Repair.