Nissan Quest E52. Instruction — part 1181

POWER STEERING CONTROL MODULE

STC-13

< ECU DIAGNOSIS INFORMATION >

STC

*4: This may not agree with the speedometer indication immediately after the ignition switch is turned ON. This
is not a malfunction.

TERMINAL LAYOUT

PHYSICAL VALUES

Fail-safe

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When an error occurs in the hydraulic pump electric power steering system, fail-safe brings the system to a
halt (instruction steering) or restricted (constant steering assist level) state. When the system is in a halt state,
fail-safe turns ON the hydraulic pump electric power steering warning lamp to warn the driver that the hydrau-
lic pump electric power steering system is in the manual steering state.

Protection Function

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• When the steering wheel is operated repeatedly or turned all the way for a long period during parking or low

speed driving, the function of the hydraulic pump electric power steering system becomes limited to prevent
the system from overheating. If the steering wheel is operated further more, the hydraulic pump electric
power steering system stops and the hydraulic pump electric power steering system warning lamp may be
turned ON. In this case, the steering wheel operation temporarily becomes hard. This is not a malfunction.
When the engine is turned OFF (ignition switch OFF) and steering operation is stopped for a while, the tem-

JSGIA0835ZZ

Terminal No.

(Wire Color)

Description

Condition

Value

(Approx.)

−

Signal name

Input/Output

(R)

Ground

Battery power supply

Input

Always

8.5 – 18.5 V

(B)

Ground

—

Always

0 V

(BR)

Ground

Ignition power supply

Input

Ignition switch: ON

8.5 – 18.5 V

Ignition switch: OFF

0 V

(P)

—

CAN-L

Input/Output

—

(L)

—

CAN-H

Input/Output

—

DTC

Fail-safe condition

C1143

Certain steering assist force

C1601

Instruction steering state

C1602

Certain steering assist force

C1606

Instruction steering state

C1607

Certain steering assist force

C1608

Instruction steering state

U1000

Normal control
NOTE:
If the cause is in a different ECU, the state changes to fixed steering assist force.

STC-14

< ECU DIAGNOSIS INFORMATION >

POWER STEERING CONTROL MODULE

perature of the hydraulic pump electric power steering system decreases and the steering operation returns
to normal after restarting the engine.

• Then, the hydraulic pump electric power steering system warning lamp turns OFF. If the system is OFF

under the protection state, the hydraulic pump electric power steering system warning lamp turns ON to
warn that the system is in the instruction steering state. (This is not a system malfunction.) In addition, the fol-
lowing DTC remains to distinguish from malfunction.

DTC Inspection Priority Chart

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

DTC Index

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NOTE:
If two or more DTCs are detected, refer to

STC-14, "DTC Inspection Priority Chart"

DTC

vehicle condition

C160A

The system temporarily enters the instruction steering state. (This is not a hydraulic pump electric
power steering system malfunction.)

Priority