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

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DTC P0616:29 [START STOP UNIT]

Description	Downstream side of starter relay signal malfunction
Detection condition	Start stop unit detects that the following signals are unmatched for 0.5 s or more for a continuous 5 times. Transmission range switch (AT)/starter interlock switch (MT) condition Starter relay downstream circuit condition PCM control result CAN signal condition output from PCM
Fail-safe	Not applicable
Possible cause	DTCs are stored in the PCM. PCM malfunction Start stop unit malfunction
System wiring diagram	Not applicable

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	VERIFY IF MALFUNCTIONING LOCATION IS PCM DEPENDING ON REPEATABILITY 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 and release it. (MT) Operate the selector lever to other than P and N position from P or 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 4.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED 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 and release it. (MT) Operate the selector lever to other than P and N position from P or 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 start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
		No	Go to the next step.
4	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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