RM3660EC _55 Steering _080761 POWER ASSIST SYSTEMS _0392075 POWER STEERING SYSTEM(for HV Model) C

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


DESCRIPTION

The power steering ECU assembly distinguishes the power switch status as on (IG) 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

·

IG power source circuit

·

Power steering ECU assembly


EPS warning light: Comes on The ECU judges the system has returned to normal or the power switch is turned on (IG) again -

WIRING DIAGRAM

C320443E63
5.438,2.823 6.76,3.24 1.323,0.417 10 false Power Steering ECU Assembly 3.708,0.875 4.438,1.104 0.729,0.229 10 false EPS-IGR 5.323,0.708 5.563,0.906 0.24,0.198 10 false I21 5.323,1.896 5.677,2.115 0.354,0.219 10 false I42 5.385,0.521 5.823,0.823 0.438,0.302 10 false 1 5.667,0.708 6.104,1.01 0.438,0.302 10 false IG 5.656,1.896 6.094,2.083 0.438,0.188 10 false PGND 5.385,1.708 5.823,2.01 0.438,0.302 10 false 2 1.427,0.719 2.99,1.104 1.563,0.385 10 false from IGR NO. 2 Relay

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER STEERING ECU ASSEMBLY)
a.

Disconnect the I42 and I21 power steering ECU assembly connectors.

C319557C31
2.094,0.344 2.542,0.583 0.448,0.24 5.083,0.344 5.531,0.583 0.448,0.24 4.646,1.938 5.031,1.375 false 2.667,2.167 2.667,1.625 false 0.323,0.135 0.635,0.292 0.313,0.156 10 false *a 2.219,0.375 2.75,0.667 0.531,0.292 10 false I42 5.188,0.375 5.719,0.667 0.531,0.292 10 false I21 2.49,2.219 3.021,2.51 0.531,0.292 10 false PGND 4.583,1.979 5.115,2.271 0.531,0.292 10 false IG
*a Front view of wire harness connector
(to Power Steering ECU Assembly) 		- -



b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I21-1 (IG) - Body ground Power switch on (IG) 8 to 16 V



c.

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