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Nissan Pathfinder Owners & Service Manuals

Nissan Pathfinder: Steering Control System - Eps Control Unit (Ecu Diagnosis Information. Removal and Installation)

Nissan Pathfinder (R53) 2022-2025 Service Manual / Steering :: Steering Control System / Eps Control Unit (Ecu Diagnosis Information. Removal and Installation)

Eps Control Unit (Ecu Diagnosis Information) Nissan Pathfinder

Values on the Diagnosis Tool

NOTE:

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

Monitor item Data monitor
Condition Display value
BATTERY VOLT Engine running 10.5 V – 16 V
STEERING TORQUE Engine running Steering wheel: Not steering (There is no steering force) Approx. 0.0 Nm
Steering wheel: Left turn Positive value (Nm)
Steering wheel: Right turn Negative value (Nm)
STEERING ANGLE SIGNAL Steering wheel: Not steering (There is no steering force) Approx. 0 deg
Steering wheel: Right turn Positive value (deg)
Steering wheel: Left turn Negative value (deg)
MOTOR CURRENT Engine running Steering wheel: Not steering (There is no steering force) Approx. 0 A
Steering wheel: Right or left turn Displays consumption current of EPS motor (A)
MOTOR TORQUE COMMAND Engine running Steering wheel: Not steering (There is no steering force) Approx. 0 A
Steering wheel: Right turn Positive value (A)
Steering wheel: Left turn Negative value (A)
C/U TEMP Engine running Displays temperature of inside of EPS control unit [°C]
ASSIST LEVEL Engine running 100%*1
Nissan Pathfinder Vehicle SPEED Vehicle stopped 0.00 km/h
While driving

Approximately equal to the indication on speedometer*2

(inside of ±10%)
WARNING LAMP Power steering warning lamp: ON On
Power steering warning lamp: OFF OFF
STEERING ANGLE SENSOR STATUS Malfunction in steering angle sensor. ABNORMAL
No Malfunction in steering angle sensor. NORMAL
ENGINE STATUS Engine not running STOP
Engine running RUN
Engine cranking CRANK
HEAT PROTECT STATUS Ignition switch ON or Engine running No over heat. NORMAL
Over heat. PRTECT
ST TORQUE FLAG Off
STOP/START STATUS Power steering system status INACT
Command steering angle -

NOTE:

Displays but not used

Current steering angle -

NOTE:

Displays but not used

PA status -

NOTE:

Displays but not used

PA ST angle valid status -

NOTE:

Displays but not used

Target motor current Engine running Steering wheel: Not steering (There is no steering force) Approx. 0 A
Steering wheel: Right turn Positive value (A)
Steering wheel: Left turn Negative value (A)
ST speed valid status -

NOTE:

Displays but not used

Control gain -

NOTE:

Displays but not used

Steering control request status -

NOTE:

Displays but not used

Steering force judgment -

NOTE:

Displays but not used

EPS status -

NOTE:

Displays but not used

EPS control (ADAS) -

NOTE:

Displays but not used

Steering wheel -

NOTE:

Displays but not used

*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: 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

1

(B)
Ground Ground Always 0 V

2

(W)
Ground Battery power supply Input Always Battery voltage

3

(BR)
Ground Ignition power supply Input Ignition switch: ON Battery voltage
Ignition switch: OFF 0 V

4

(GR)
CAN-High Input/Output

5

(G)
CAN-Low Input/Output

9

(B)
Ground Ground Always 0 V

10

(Y)
Sub signal Input/Output

11

(W)
Main signal Input/Output

12

(R)
Ground Power supply Input Always Battery voltage

Fail-safe

  • If any malfunction occurs in the system and control module detects the malfunction, power steering warning lamp on combination meter turns ON to indicate system malfunction.

  • When power steering warning lamp is ON, the system enters into a manual steering state. (Control turning force steering wheel becomes heavy.)

DTC Fail-safe condition
C1601–01 Manual steering state
C1602–01 Temporary steering state
C1604–01 Manual steering state
C1606–01 Manual steering state
C1607–01 Constant steering state
C1608–01 Manual steering state
C1620–82 Normal steering state
C1620–83
C1620–86
C1620–87
C1621–86
C1621–87
C1623–86
C1623–87
C1629–87
C1632–86
C1633–86
C1633–87
C1634–86
C1635–87
C1638–86
C161A-82 Constant steering state
C161A-83
C161A-86
C161A-87
C161B-82
C161B-83
C161B-86
C161B-87
C161C-82 Normal steering state
C161C-83
C161C-86
C161C-87
C161E-82
C161E-83
C161E-86
C161E-87
C161F-86 Lock the drive mode function to the last position or STANDARD/AUTO position
C161F-87
U1010–49 Constant steering state
U2140–87 Normal steering state
U2148–87
U214F-87
U2156–87
U215B-87
U2176–87 Last position drive mode switch was in STANDARD/AUTO position

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

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

Priority Priority order item (DTC)
1 C1601–01 BATTERY VOLT
2
  • C1602–01 NO TUNING SET

  • C1604–01 TORQUE SENSOR

  • C1606–01 EPS MOTOR

  • C1607–01 EEPROM

  • C1608–01 CONTROL UNIT

3
  • C161A-82 ABS SYSTEM

  • C161A-83 ABS SYSTEM

  • C161A-86 ABS SYSTEM

  • C161A-87 ABS SYSTEM

  • C161B-82 ABS SYSTEM

  • C161B-83 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-82 ABS SYSTEM

  • C161E-83 ABS SYSTEM

  • C161E-86 ABS SYSTEM

  • C161E-87 ABS SYSTEM

  • C161F-86 Chassis control system

  • C161F-87 Chassis control system

  • C1620-82 Chassis control system

  • C1620-83 Chassis control system

  • C1620-86 Chassis control system

  • C1620-87 Chassis control system

  • C1621-86 BCM SYSTEM

  • C1621-87 BCM SYSTEM

  • C1623-86 ECM SYSTEM

  • C1623-87 ECM SYSTEM

  • C1629-87 IPDM E/R SYSTEM

  • C1632-86 ABS system

  • C1633-86 VDC SYSTEM

  • C1633-87 VDC SYSTEM

  • C1634-86 ST angle sensor system

  • C1635-87 ECM SYSTEM

  • C1638-86 Chassis control 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 angel sensor)

  • U215B-87 CAN comm err (IPDM E/R)

  • U2176-87 CAN comm err (CCM)

4 U1010–49 CONTROL UNIT(CAN)

DTC Index

Self Diagnostic Result
DTC Items Power steering warning lamp Reference
C1601–01 BATTERY VOLT ON DTC Description
C1602–01 NO TUNING SET ON DTC Description
C1604–01 TORQUE SENSOR ON DTC Description
C1606–01 EPS MOTOR ON DTC Description
C1607–01 EEPROM OFF DTC Description
C1608–01 CONTROL UNIT ON DTC Description
C1620–82 Chassis control system OFF DTC Description
C1620–83
C1620–86
C1620–87
C1621–86 BCM system OFF DTC Description
C1621–87
C1623–86 ECM system OFF DTC Description
C1623–87
C1629–87 IPDM E/R system OFF DTC Description
C1632–86 ABS system OFF DTC Description
C1633–86 VDC system OFF DTC Description
C1633–87
C1634–86 ST angle sensor system OFF DTC Description
C1635–87 ECM system OFF DTC Description
C1638–86 Chassis control system OFF DTC Description
C161A-82 ABS system OFF DTC Description
C161A-83
C161A-86
C161A-87
C161B-82 ABS system OFF DTC Description
C161B-83
C161B-86
C161B-87
C161C-82 ST angle sensor system OFF DTC Description
C161C-83
C161C-86
C161C-87
C161E-82 ABS system OFF DTC Description
C161E-83
C161E-86
C161E-87
C161F-86 Chassis control system OFF DTC Description
C161F-87
Network-DTC
DTC Display item EPS warning lamp Refer to
U1010–49 CONTROL UNIT(CAN) 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
U2176–87 CAN comm error (CCM) OFF DTC Description

NOTE:

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

Eps Control Unit (Removal and Installation) Nissan Pathfinder 2025

Removal and Installation

The EPS control unit is an integral part of the steering gear assembly.

If replacement of the EPS control unit is necessary, replace the steering gear assembly. Refer to Removal and Installation.

Nissan Pathfinder (R53) 2022-2025 Service Manual

Eps Control Unit (Ecu Diagnosis Information. Removal and Installation)

Contact Us

Nissan Pathfinder Info Center

Email: info@nipathfinder.com

Phone: +1 (800) 123-4567

Address: 123 Pathfinder Blvd, Nashville, TN 37214, USA

Working Hours: Mon–Fri, 9:00 AM – 5:00 PM (EST)

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