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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC P0615:16 [START STOP UNIT]

Description	Starter relay circuit malfunction
Detection condition	Start stop unit detects that the starter relay circuit voltage that is less than the specification for 0.05 s or more during cranking.
Fail-safe	Not applicable
Possible cause	Starter relay malfunction Start stop unit connector or terminal malfunction Short to ground in wiring harness between starter relay terminal A and start stop unit terminal 2V Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT STARTER RELAY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Remove the starter relay. (See RELAY LOCATION.) Inspect the starter relay. (See RELAY INSPECTION.) Is the starter relay normal?	Yes	Go to the next step.
		No	Replace the starter relay, then go to Step 4. (See RELAY LOCATION.)
2	INSPECT START STOP UNIT CONNECTOR CONDITION Disconnect the start stop unit connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then go to Step 4.
3	INSPECT STARTER RELAY CIRCUIT FOR SHORT TO GROUND Verify that the starter relay is removed. Verify that the start stop unit connector is disconnected. Inspect for continuity between start stop unit terminal 2V (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between starter relay terminal A and start stop unit terminal 2V. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to the next step.
		No	Go to the next step.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Wait until 1 s or more have elapsed during cranking. Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
		No	Go to the next step.
5	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
		No	DTC troubleshooting completed.

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