RM3660EC _55 Steering _080761 POWER ASSIST SYSTEMS _0392052 POWER STEERING SYSTEM(for Gasoline Model) C

POWER ASSIST SYSTEMS  POWER STEERING SYSTEM(for Gasoline Model)  C123A17  Supply Voltage Circuit Circuit Voltage Above Threshold  


DESCRIPTION

The power steering ECU assembly distinguishes the ignition switch status as ON or off through the IG power source circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note
C123A17 Supply Voltage Circuit Circuit Voltage Above Threshold IG voltage is 18.5 V or more
·

EPS-IGR fuse (w/o Stop and Start System)

·

IG power source circuit

·

Power steering ECU assembly


EPS warning light: Comes on The ECU judges the system has returned to normal or the ignition switch is turned to ON again -

WIRING DIAGRAM

C319560E15
5.302,0.719 5.76,0.917 0.458,0.198 10 false I21 5.302,2.104 5.76,2.302 0.458,0.198 10 false I42 4.458,0.625 4.917,0.823 0.458,0.198 10 false *1 4.865,1.073 5.177,1.271 0.313,0.198 10 false *2 1.031,1.302 2.938,1.656 1.906,0.354 10 false from Stop and Start System 5.458,2.823 6.74,3.292 1.281,0.469 10 false Power Steering ECU Assembly 0.531,2.604 3.229,2.948 2.698,0.344 10 false *1: w/o Stop and Start System 5.344,0.521 5.5,0.719 0.156,0.198 10 false 1 5.354,1.875 5.51,2.073 0.156,0.198 10 false 2 5.677,0.719 5.99,0.917 0.313,0.198 10 false IG 5.677,2.104 6.156,2.302 0.479,0.198 10 false PGND 1.396,0.698 2.823,0.99 1.427,0.292 10 false from IGR NO. 2 Relay 0.542,3.073 2.594,3.354 2.052,0.281 10 false *2: w/ Stop and Start System 3.698,0.917 4.469,1.115 0.771,0.198 10 false EPS-IGR

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


PROCEDURE

1.CHECK HARNESS AND CONNECTOR (IG)
a.
C417282C01
1.521,0.417 1.875,0.677 0.354,0.26 1.365,1.74 0.948,2.177 false 1.594,0.469 1.917,0.823 0.323,0.354 10 false I21 0.198,0.198 0.635,0.625 0.438,0.427 10 false *a 0.792,2.188 1.229,2.5 0.438,0.313 10 false IG
*a Front view of wire harness connector
(to Power Steering ECU Assembly)


Disconnect the I21 power steering ECU assembly connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition

*1: w/o Stop and Start System

*2: w/ Stop and Start System

I21-1 (IG) - Body ground Ignition Switch ON 8 to 16 V*1
10.5 to 16 V*2



Result:
Result Proceed to
OK A
NG (w/o Stop and Start System) B
NG (w/ Stop and Start System) C



A

2.CHECK HARNESS AND CONNECTOR (PGND)

B

REPAIR OR REPLACE HARNESS OR CONNECTOR

C

GO TO STOP AND START SYSTEM (Backup Boost Converter Circuit)

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>Backup Boost Converter Circuit


2.CHECK HARNESS AND CONNECTOR (PGND)
a.
C417283C01
1.479,0.604 1.896,0.865 0.417,0.26 2.469,1.99 2.885,1.99 true 0.271,0.26 0.635,0.51 0.365,0.25 10 false *a 1.594,0.646 1.958,0.896 0.365,0.25 10 false I42 2.917,1.917 3.365,2.49 0.448,0.573 10 false PGND
*a Front view of wire harness connector
(to Power Steering ECU Assembly)


Disconnect the I42 power steering ECU assembly connectors.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
I42-2 (PGND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE POWER STEERING ECU ASSEMBLY

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR