Nissan Sentra B18 (2020-2025) Service Manual / Steering / Steering Control System :: Ecu Diagnosis Information. Eps Control Unit

Nissan Sentra B18 (2020-2025) Service Manual: Steering Control System :: Ecu Diagnosis Information. Eps Control Unit

Eps Control Unit. Values on the Diagnosis Tool

Values on the Diagnosis Tool

Note:

The following table includes information (items) inapplicable to this Nissan Sentra vehicle: For information (items) applicable to this vehicle, refer to CONSULT display items.

Monitor item	Data Monitor
Monitor item	Condition		Display value
Steering torque	Engine running	Steering wheel: Not steering (There is no steering force)	Approx. 0.0 Nm
		Steering wheel: Right turn	Positive value (Nm)
		Steering wheel: Left turn	Positive value (Nm)
Assist level	Engine running		100%^*1
EPS warning	Engine running	EPS system is normal	No error
		Not used	Error1
		EPS system malfunction	Error2
Demanded assistance torque	Engine running	Steering wheel: Not steering (There is no steering force)	Approx. 0 Nm
		Steering wheel: Right turn	Positive value
		Steering wheel: Left turn	Negative value
Measured motor current	Engine running	Steering wheel: Not steering (There is no steering force)	Approx. 0 A
Measured motor current	Engine running	Steering wheel: Left or Right turn	Displays consumption current of EPS motor^*2
ECU temperature	Ignition switch ON or engine running		Displays temperature of inside of EPS control unit
Battery voltage	Ignition switch ON		10.5 - 16 V
Nissan Sentra Vehicle speed	Nissan Sentra Vehicle stopped		0.00 kp/h or mph
Nissan Sentra Vehicle speed	While driving		Approximately equal to the indication on speedometer^*3 (inside of ±10%)
ENGINE STATUS	Engine not running		STOP
	Engine stall		STALL
	Engine running		RUN
	Engine cranking		CRANK

*1: Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls. However, it returns to 100% when left standing.

*2: Almost in accordance with the value of “Target motor current”. It is not a malfunction though these values are not accorded when steering quickly

*3: It is not a malfunction, though it might not be corresponding just after ignition switch ON.

Reference Value

TERMINAL LAYOUT

PHYSICAL VALUES

Terminal No. (Wire Color)		Description		Condition	Value (Approx.)
+	−	Signal name	Input/Output	Condition	Value (Approx.)
1 (P)	—	CAN-Low	Input/Output	—	—
2 (L)	—	CAN-High	Input/Output	—	—
4 (SB)	Ground	Ignition power supply	Input	Ignition switch: ON	Battery voltage
4 (SB)	Ground	Ignition power supply	Input	Ignition switch: OFF	0 V
7 (R)	Ground	Battery power supply	Input	Always	Battery voltage
8 (B)	Ground	Ground	—	Always	0 V
9 (Y)	—	—	—	—	—
10 (W)	—	—	—	—	—
12 (BR)	—	—	—	—	—
13 (G)	—	—	—	—	—

Fail-Safe

If any malfunction occurs in the system and control unit detects the malfunction, EPS warning lamp on combination meter turns ON to indicate system malfunction.
When EPS warning lamp is ON, the system enters into a manual steering state (control turning force steering wheel becomes heavy).

DTC	Fail-safe condition
C1601-16	Manual steering state
C1601-17
C1604-96
C1606-96
C1608-43
C1608-44
C1608-45
C1608-46	Normal control
C1608-49	Manual steering state
C1608-54	Normal control
C161A-82	Constant steering assist level
C161A-83
C161A-86
C161B-86
C161B-87
C1624-00	Slowly reducing assistance
C161C-82	Normal control
C161C-83
C161C-86
C161C-87
C161E-86
C1621-86
C1621-87
C1623-87
C1629-87
C1630-87
U0073-00
U2140-87
U2148-87
U214F-87
U2156-87
U215B-87

Protection Function

EPS control unit decreases the output signal to EPS motor while extremely using the power steering function (e.g., full steering) consecutively for protecting EPS motor and EPS control unit (overload protection control). While activating overload protection control, the assist torque gradually decreases, and the steering wheel turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a while.

Dtc Inspection Priority Chart

DTC Inspection Priority Chart

When multiple DTCs are detected simultaneously, check one by one depending on the following priority list:

Priority	Detected item (DTC)
1	C1601-16 BATTERY VOLT C1601-17 BATTERY VOLT C1630-87 CAN COMM CIRCUIT U0073-00 Control module comm bus "A" Off
2	C1604-96 TORQUE SENSOR C1606-96 EPS MOTOR C1608-43 CONTROL UNIT C1608-44 CONTROL UNIT C1608-45 CONTROL UNIT C1608-46 CONTROL UNIT C1608-49 CONTROL UNIT C1608-54 CONTROL UNIT C1624-00 Signal connector
3	C161A-82 ABS system C161A-83 ABS system C161A-86 ABS system C161B-86 ABS system C161B-87 ABS system C161C-82 ST angle sensor system C161C-83 ST angle sensor system C161C-86 ST angle sensor system C161C-87 ST angle sensor system C161E-86 ABS system C1621-86 BCM system C1621-87 BCM system C1623-87 ECM system C1629-87 IPDM E/R system U2140-87 CAN comm err (ECM) U2148-87 CAN comm err (brake control unit) U214F-87 CAN comm err (BCM) U2156-87 CAN comm err (steering angle sensor) U215B-87 CAN comm err (IPDM E/R)

Dtc Index

DTC Index

Self Diagnostic Result
DTC	Display item	EPS warning lamp	Refer to
C1601-16	BATTERY VOLT	ON	DTC Description
C1601-17	BATTERY VOLT	ON	DTC Description
C1604-96	TORQUE SENSOR	ON	DTC Description
C1606-96	EPS MOTOR	ON	DTC Description
C1608-43	CONTROL UNIT	ON	DTC Description
C1608-44	CONTROL UNIT	ON	DTC Description
C1608-45	CONTROL UNIT	ON	DTC Description
C1608-46	CONTROL UNIT	ON	DTC Description
C1608-49	CONTROL UNIT	ON	DTC Description
C1608-54	CONTROL UNIT	ON	DTC Description
C161A-82	ABS system	OFF	DTC Description
C161A-83	ABS system	OFF	DTC Description
C161A-86	ABS system	OFF	DTC Description
C161B-86	ABS system	OFF	DTC Description
C161B-87	ABS system	OFF	DTC Description
C161C-82	ST angle sensor system	OFF	DTC Description
C161C-83	ST angle sensor system	OFF	DTC Description
C161C-86	ST angle sensor system	OFF	DTC Description
C161C-87	ST angle sensor system	OFF	DTC Description
C161E-86	ABS system	OFF	DTC Description
C1621-86	BCM system	OFF	DTC Description
C1621-87	BCM system	OFF	DTC Description
C1623-87	ECM system	OFF	DTC Description
C1624-00	Signal connector	OFF	DTC Description
C1629-87	IPDM E/R system	OFF	DTC Description
C1630-87	CAN COMM CIRCUIT	OFF	DTC Description

Network-DTC
DTC	Display item	EPS warning lamp	Refer to
U0073-00	Control module comm bus "A" Off	ON	DTC Description
U2140-87	CAN comm err (ECM)	OFF	DTC Description
U2148-87	CAN comm err (brake control unit)	OFF	DTC Description
U214F-87	CAN comm err (BCM)	OFF	DTC Description
U2156-87	CAN comm err (steering angle sensor)	OFF	DTC Description
U215B-87	CAN comm err (IPDM E/R)	OFF	DTC Description

Note:

If two or more DTCs are detected, refer to DTC Inspection Priority Chart.

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