EPS Control Module Inspection

Remove the following parts:
1. Engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [13B-MSP] .)
2. Battery cover. (See BATTERY REMOVAL/INSTALLATION [13B-MSP] .)
3. PCM cover (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
4. PCM (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
5. PCM bracket No. 1 (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
6. PCM bracket No. 2 (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
7. PCM bracket No. 3 (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
8. EPS control module (See EPS CONTROL MODULE REMOVAL/INSTALLATION .)
Connect the PCM and EPS control module connectors.
Attach the tester lead to the underside of the control module connector and inspect the voltage and continuity according to the Terminal Voltage Table (Reference) indicated in the table.
NOTE:
- When inspecting the torque sensor and EPS motor for continuity, turn the ignition switch off and inspect with the connectors for the EPS control module, torque sensor, and EPS motor disconnected.
Terminal Voltage Table (Reference)

Fig 1: Identifying EPS Control Module Connector
Courtesy of MAZDA MOTORS CORP.

EPS CONTROL MODULE CONNECTOR TERMINAL REFERENCE

Terminal	Signal name	Connected to	Measured item	Measured terminal (measured condition)	Standard	Inspection item(s)
1A	Battery power supply	Battery	Voltage	Under any condition	B+	Wiring harness (1 A-battery) Fuse (60 A)
1B	Ground	Ground point	Voltage	Under any condition	1 V or less	Wiring harness (1B-ground point)
2A	Ground	Ground point	Voltage	Under any condition	1 V or less	Wiring harness (2A-ground point)
2B	-	-	-	-	-	-
2C	-	-	-	-	-	-
2D	-	-	-	-	-	-
2E	-	-	-	-	-	-
2F	-	-	-	-	-	-
2H	-	-	-	-	-	-
2J	-	-	-	-	-	-
2K	CAN_L	-	Inspect under DTC inspection.			-
2L	-	-	-	-	-	-
2M	CAN_H	-	Inspect under DTC inspection.			-
2N	-	-	-	-	-	-
20	Ground	Ground point	Voltage	Under any condition	1 V or less	Wiring harness (20-ground point)
2P	Ignition power supply	Ignition switch	Voltage	Ignition switch is ON	B+	Wiring harness (2P-ignition switch-battery) Fuse (15 A)
2P	Ignition power supply	Ignition switch	Voltage	Ignition switch is OFF	1 or less	Wiring harness (2P-ignition switch-battery) Fuse (15 A)
3A	Torque sensor (Signal 2)	Torque sensor	Continuity	Terminal 3A-torque sensor terminal A	Continuity detected	Wiring harness (3A-torque sensor A)
3B	Torque sensor (Drive signal)	Torque sensor	Continuity	Terminal 3B-torque sensor terminal B	Continuity detected	Wiring harness (3B-torque sensor B)
3C	Torque sensor (Signal 1)	Torque sensor	Continuity	Terminal 3C-torque sensor terminal C	Continuity detected	Wiring harness (3C-torque sensor C)
4A	EPS motor	EPS motor	Continuity	Terminal 4A-EPS motor terminal A	Continuity detected	Wiring harness (4A-EPS motor A)
4B	EPS motor	EPS motor	Continuity	Terminal 4B-EPS motor terminal B	Continuity detected	Wiring harness (4B-EPS motor B)