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

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DTC P0616:24 [START STOP UNIT]

Description	Circuit malfunction on downstream side of starter relay
Detection condition	Start stop unit detects an open circuit in the starter relay downstream circuit continuously for 0.5 s or more for a continuous 5 times.
Fail-safe	Not applicable
Possible cause	DTCs are stored in the PCM. Starter relay malfunction PCM connector or terminal malfunction Open circuit in wiring harness between starter relay terminal E and PCM terminal 2AZ PCM malfunction Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].)
		No	Go to the next step.
2	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 6. (See RELAY LOCATION.)
3	INSPECT PCM CONNECTOR CONDITION Disconnect the PCM 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 6.
4	INSPECT DOWNSTREAM SIDE OF STARTER RELAY CIRCUIT FOR OPEN CIRCUIT Verify that the starter relay is removed. Verify that the PCM connector is disconnected. Inspect for continuity between starter relay terminal E (wiring harness-side) and PCM terminal 2AZ (wiring harness-side). Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between starter relay terminal E and PCM terminal 2AZ. 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 an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 6.
5	VERIFY IF MALFUNCTIONING LOCATION IS PCM DEPENDING ON REPEATABILITY 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].) With the programmed remote transmitter in the vehicle, switch the ignition ON (engine off). Perform the following work 5 times or more. Depress the clutch pedal. (MT) Operate the selector lever to P or N position from other than P and N position and hold for 1 s or more. (AT) Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
		No	Go to Step 7.
6	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].) With the programmed remote transmitter in the vehicle, switch the ignition ON (engine off). Perform the following work 5 times or more. Depress the clutch pedal. (MT) Operate the selector lever to P or N position from other than P and N position and hold for 1 s or more. (AT) 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.
7	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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