Electric Power Steering Control Unit (Honda Civic 7)

Examination

Check the voltage at the terminals of the EPS control unit and compare the measured values with those given in the table "Checking the signals at the terminals of the EPS control unit".

Replace the faulty element if necessary.

Table. Checking signals at the EPS control unit terminals.

Conclusion	Output name	Wire colors	Examination
			Compound	Verification conditions	Result
A1	+B	W/BI	A1 <-> GND	Constantly	VB
A2	PG	IN	A2<-> GND	-	-
B1	M1	R	B1 <-> GND	The engine is running, the steering wheel is turning	0<->7-14V
B2	M2	G	B2 <-> GND	The engine is running, the steering wheel is turning	7-14<->0B
C1*1	VT6	Y/R	C1 <-> GND	The engine is running, the steering wheel is turning	0 <-> 5 V
C2	T/S GND	R	C2 <-> GND	-	-
SZ	VCC1	ABOUT	SZ GND	The engine is started	Vv
				Ignition is off	0B
C5*2	VT6	Y/R	C5 <-> GND	The engine is running, the steering wheel is turning	0<->5B
C6	WLP	Y/BI	C6 <-> GND	EPS indicator is not on	Vv
				EPS indicator is on	0B
C7	VSP	BI/W	C7 <-> GND	The front wheels are spinning	Varies within 0 <-> 5 V

Table. Checking signals at the terminals of the EPB control unit.(continuation)

Conclusion	Output name	Wire colors	Examination
			Compound	Verification conditions	Result
C8	SCS	Br	C8 <-> GND	The "SCS" pin is shorted	0 B
				The "SCS" pin is not shorted	≈5 V
C10	IG1	Y	C10<->GND	The key in the ignition switch is in the "ON" (II) position	VB
				The key in the ignition switch is in the "OFF" position	0 B
C11	VCC2	G/Y	C11<->GND	The engine is started	5 V
				Ignition is off	0 B
C13	VT3	BI/O	C13<->GND	The engine is running, the steering wheel is turning	0 <-> 5 V
C15	T/SIG	Y/B	C15<->GND	The engine is started	0 <-> 5 V
C17	PSW	Lg/B	C17<->GND	The engine is running, the steering wheel is turning	0<->VB
C19	NEP	Bl	C19<->GND	The engine is running at idle speed	0<-> VB
C20	DIAG-H	Gr	-	-	-

Note:

• ^*1 - 50A;
• ^*2 - 60A.

Removal and installation

1. Disconnect the cable from the negative terminal of the battery.

2. Remove the lower trim panel on the passenger side (see chapter "Body").

3. Bend back the floor covering, unscrew the nuts and remove the control unit.



4. Disconnect the connector from the control unit.

Note:

• Installation is carried out in the reverse order of removal.
• After installation, start the engine and set the idle speed, turn the steering wheel from lock to lock several times and make sure the "EPS" indicator is off.

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