ON-BOARD DIAGNOSTIC SYSTEM FUNCTION [ELECTRIC POWER STEERING (EPS)]

• The malfunction detection function detects malfunctions in the input/output signal system of the EPS control module when the ignition switch is at the ON position or driving the vehicle.

• When the malfunction detection function detects a malfunction, the EPS warning light illuminates or flashes to advise the driver. Using the external tester communication function, DTCs can be output to the DLC-2 via the CAN line. At the same time, malfunction detection results are sent to the memory and fail-safe functions.

• The EPS warning light may not illuminate depending on the detected malfunction.

• The memory function stores DTCs of malfunctions in input/output signal systems. With this function, once a DTC is stored it is not cleared after the ignition switch has been turned off (LOCK position), even if the malfunctioning signal system has returned to normal.

• Since the EPS control module has a built-in non-volatile memory, DTCs are not cleared even if the battery is removed. Therefore, it is necessary to clear the memory after performing repairs. Refer to the Workshop Manual for the DTC clearing procedure.

• When the malfunction detection function determines a malfunction, the EPS warning light illuminates or flashes to advise the driver. At this time, the fail-safe function disables system control.

System Malfunction Location	DTC (Mazda Modular Diagnostic System (M-MDS) display)	Fail-safe function
System Malfunction Location	DTC (Mazda Modular Diagnostic System (M-MDS) display)	EPS warning light illumination status	Control status
Steering angle sensor	C1B00:2F	Not illuminated	Control enabled^*1
Steering angle sensor	C1B00:54	Illuminated^*2	Control enabled^*1
Steering angle sensor	C1B00:61	Illuminated	Control disabled
Steering angle sensor	C1B00:62	Not illuminated	Control enabled^*1
Steering angle sensor (mis-assembly)	C1B00:95	Illuminated^*3	Control enabled^*1
Torque sensor	C200B:2F	Illuminated	Control disabled
Torque sensor	C200B:61	Illuminated	Control disabled
Torque sensor	C200C:2F	Illuminated	Control disabled
EPS motor	C200D:49	Illuminated	Control disabled
CAN system communication error	U0001:88	Illuminated	Control enabled^*1
CAN system communication error	U0100:00	Not illuminated^*4	Control disabled^*5
EPS control module	U0300:00	Not illuminated	Control enabled^*1
CAN system communication error	U0401:00	Not illuminated^*4	Control disabled^*5
EPS motor	U2011:49	Illuminated	Control disabled
EPS motor	U2011:61	Illuminated	Control disabled
EPS configuration	U2100:00	Illuminated	Control disabled^*5
EPS control module	U3000:05	Illuminated	Control disabled
EPS control module	U3000:41	Illuminated	Control disabled
EPS control module	U3000:43	Not illuminated	Control disabled
EPS control module	U3000:46	Not illuminated	Control disabled
EPS control module	U3000:49	Illuminated	Control disabled
EPS control module	U3000:61	Illuminated	Control disabled
EPS control module	U3000:96	Illuminated	Control disabled
Battery power supply	U3003:16	Illuminated	Control disabled
Battery power supply	U3003:17	Illuminated	Control disabled
EPS control module	U3004:49	Illuminated	Control disabled

*1 :Control is maintained in fail mode.

*2 :The EPS warning light illuminates when a present malfunction is detected. When the ignition switch is turned off and then turned to the ON position after detecting a malfunction, the EPS warning light flashes if the malfunction was caused by an incorrect installation, and re-illuminates if the cause is the EPS control module internal malfunction.

*3 :Illuminates only when a present malfunction is detected. Does not illuminate when a past malfunction is detected (Ignition switch is turned off after detection).

*4 :Illuminates if a malfunction is detected when the ignition switch is turned to the ON position. It does not illuminate if a malfunction is detected after the engine is started.

*5 :Control is inhibited if a malfunction is detected when the ignition switch is turned to the ON position. Control is maintained in fail mode if a malfunction is detected after the engine is started.