Here is the instruction show you guide on how to solve JCB excavator P0615-13 trouble code starter relay open circuit.
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Possible Cause:
1 Faulty starter relay.
2 Starter relay not connected to machine
3 Faulty wire harness.
4 Terminal back out from starter relay base.
5 Terminal back out from MECU wire harness connector.
Diagnosis:
1 Check the starter relay coil resistance. Resistance values shall be 220 Ω.
2 Check starter relay connected to relay box. Refer below photograph.
Check the connectivity between wire no 8065 & wire no 8067 in MECU wire harness connector for the terminal back out. Refer below photograph.
Check the connectivity between wire no 8065 & wire no 8067 to verify the terminal back out in the starter relay base (Relay Box).Refer below photograph.
Corrective Action:
1 Replace faulty starter relay.
2 Replace the wire harness or correct the open circuit in the wire harness if terminal back out is there.
More topics for JCB machine,please refer to:JCB Machine Trouble Repair.