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

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DTC U0442:00 [TCM (SJ6A-EL)]

DTC U0442:00	CAN communication: Error signal received from PCM
DETECTION CONDITION	Throttle opening signal error Vehicle condition: TCM communication normal Status: Detects throttle opening angle signal error Period: Confirmed 1 time in 0.5 s or more Accelerator opening angle signal error Vehicle condition: TCM communication normal Status: Detects accelerator opening angle signal error Period: Confirmed 1 time in 0.5 s or more Engine torque signal error Vehicle condition: TCM communication normal Status: Detects engine torque signal error Period: Confirmed 1 time in 0.5 s or more Engine speed signal error Vehicle condition: TCM communication normal Status: Detects engine speed signal error Period: Confirmed 1 time in 0.5 s or more Engine coolant temperature signal error Vehicle condition: TCM communication normal Status: Detects engine coolant signal error Period: Confirmed 1 time in 0.5 s or more Detects engine misfire Vehicle condition: TCM communication normal Status: Detects engine misfire determination signal Period: Confirmed 1 time
FAIL-SAFE FUNCTION	Throttle opening signal error 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. Accelerator opening angle signal error 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. Engine torque signal error Inhibits learning control. Inhibits AAS mode. Inhibits slip control. Inhibits 5GR and 6GR. Inhibits the slope control. Engine speed signal error 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. Engine coolant temperature signal error Performs control with the ATF temperature of 80 °C {176 °F}. Inhibits AAS mode. Inhibits slip control. Inhibits the neutral control. Inhibits the slope control. Detects engine misfire Inhibits learning control. Inhibits direct mode. Inhibits AAS mode. Inhibits the TCC control and slip control. Inhibits 5GR and 6GR. Inhibits the slope control.
POSSIBLE CAUSE	PCM DTC is stored.
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic procedure

STEP	INSPECTION		ACTION
1	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.
2	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	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].)
		No	Go to the next step.
3	VERIFY DTC TROUBLESHOOTING COMPLETED 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 and warm it up completely. Drive the vehicle for a while under the following conditions: Selector lever position: D position 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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