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

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DTC U0115:00 [TCM (SJ6A-EL)]

DTC U0115:00	CAN communication: Communication error between PCM (local CAN between TCM and PCM)
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects communication error with PCM Period: Detects communication time-out
FAIL-SAFE FUNCTION	Inhibits learning control. Inhibits direct mode. Inhibits AAS mode. Inhibits the TCC control and slip control. Inhibits 5GR and 6GR. Inhibits the neutral control. Inhibits the slope control.
POSSIBLE CAUSE	PCM connector or terminal malfunction TCM connector or terminal malfunction CAN communication line malfunction between PCM and TCM CAN drive error (TCM or PCM) PCM malfunction TCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION NOTE: Recording can be facilitated using the screen capture of the PC function. Record the freeze frame data/snap shot data.	—	Go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
		No	Go to the next step.
3	VERIFY OTHER RELATED DTCs Switch the ignition off, then ON (engine off). Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Is any other DTC stored?	Yes	Follow the applicable DTC inspection procedure, then go to the next step. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)
		No	Go to the next step.
4	INSPECT PCM CONNECTOR FOR POOR CONNECTION Switch the ignition off. Disconnect the PCM connector. Inspect for poor connection at PCM terminals 1A and 1B (such as damaged/pulled-out pins, corrosion). Are terminals normal?	Yes	Go to the next step.
		No	Repair or replace the connector and/or terminal, then go to Step 7.
5	INSPECT TCM CONNECTOR FOR POOR CONNECTION Disconnect the TCM connector. Inspect for poor connection at TCM terminals 1AI and 1AE (such as damaged/pulled-out pins, corrosion). Are terminals normal?	Yes	Go to the next step.
		No	Repair or replace the connector and/or terminal, then go to Step 7.
6	VERIFY PCM DTC Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) Are any DTCs present?	Yes	DTC U0074:00 or U0302:00 is displayed: CAN communication line can be considered the cause. Repair or replace the wiring harness between PCM and TCM, then go to the next step. DTC other than U0074:00 and U0302:00 is displayed: Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].)
		No	PCM can be considered the cause. Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
7	VERIFY SAME DTC IS NOT PRESENT Always reconnect all disconnected connectors. Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Perform the following procedure to ensure that the DTC has been resolved: Start the engine. Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)
		No	Go to the next step.
8	VERIFY DTC TROUBLESHOOTING COMPLETED Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (SJ6A-EL)].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)
		No	DTC troubleshooting completed.

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