RM36D0EC _55 Steering _083083 POWER ASSIST SYSTEMS _0403821 POWER STEERING SYSTEM J

POWER ASSIST SYSTEMS  POWER STEERING SYSTEM  EPS Warning Light Circuit  


DESCRIPTION

Perform the following troubleshooting procedure when the EPS warning light remains on after the ignition switch is turned to ON (READY) but no DTCs are stored.

HINT:
·

If the power steering ECU (rack and pinion power steering gear assembly) detects a malfunction in the power source voltage input (IG) circuit, the EPS warning light illuminates.

·

If the power steering ECU (rack and pinion power steering gear assembly) detects a drop in the power voltage input (IG and PIG) circuit, the force required to turn the steering wheel may increase, the EPS warning light turns on in order to warn the driver.



WIRING DIAGRAM

for HV Model:
C437654E10
3.333,1.813 3.792,2.01 0.458,0.198 10 false EPS 3.208,2.448 3.979,2.646 0.771,0.198 10 false EPS-IGR 4.906,1.531 5.073,1.698 0.167,0.167 10 false 8 4.885,2.125 5.052,2.292 0.167,0.167 10 false 4 5.635,1.646 6.094,1.844 0.458,0.198 10 false PIG 5.635,2.26 6.094,2.458 0.458,0.198 10 false IG 5.625,0.521 6.24,0.719 0.615,0.198 10 false CANH 5.625,0.917 6.24,1.115 0.615,0.198 10 false CANL 4.792,0.344 5.104,0.542 0.313,0.198 10 false 10 4.802,0.771 5.115,0.969 0.313,0.198 10 false 11 4.875,2.823 5.031,3.021 0.156,0.198 10 false 7 5.635,2.958 6.25,3.156 0.615,0.198 10 false PGND 1.729,0.531 2.344,0.729 0.615,0.198 10 false CANH 1.729,0.927 2.344,1.125 0.615,0.198 10 false CANL 2.229,0.354 3.333,0.594 1.104,0.24 10 false 31 2.229,0.771 3.281,0.958 1.052,0.188 10 false 14 0.667,1.094 1.125,1.292 0.458,0.198 10 false G150 0.667,1.302 2.938,1.583 2.271,0.281 10 false Combination Meter Assembly 5.24,3.365 6.583,3.583 1.344,0.219 10 false Power Steering ECU 4.052,3.958 7.094,4.198 3.042,0.24 10 false Rack and Pinion Power Steering Gear Assembly 0.833,4.344 4.5,4.542 3.667,0.198 10 false : CAN Communication Line 4.042,3.729 4.5,3.927 0.458,0.198 10 false C54

for Gasoline Model:
C530649E02
3.333,1.813 3.792,2.01 0.458,0.198 10 false EPS 4.906,1.531 5.073,1.698 0.167,0.167 10 false 8 4.885,2.125 5.052,2.292 0.167,0.167 10 false 4 5.635,1.646 6.094,1.844 0.458,0.198 10 false PIG 5.635,2.26 6.094,2.458 0.458,0.198 10 false IG 5.625,0.521 6.24,0.719 0.615,0.198 10 false CANH 5.625,0.917 6.24,1.115 0.615,0.198 10 false CANL 4.792,0.344 5.104,0.542 0.313,0.198 10 false 10 4.802,0.771 5.115,0.969 0.313,0.198 10 false 11 4.875,2.823 5.031,3.021 0.156,0.198 10 false 7 5.635,2.958 6.25,3.156 0.615,0.198 10 false PGND 1.729,0.531 2.344,0.729 0.615,0.198 10 false CANH 1.729,0.927 2.344,1.125 0.615,0.198 10 false CANL 2.229,0.354 3.333,0.594 1.104,0.24 10 false 9*1 , 31*2 2.208,0.771 3.26,0.958 1.052,0.188 10 false 25*1 , 14*2 0.688,1.25 1.625,1.469 0.938,0.219 10 false G18*1, G150*2 0.688,1.479 2.958,1.76 2.271,0.281 10 false Combination Meter Assembly 5.24,3.365 6.583,3.583 1.344,0.219 10 false Power Steering ECU 4.052,3.958 7.094,4.198 3.042,0.24 10 false Rack and Pinion Power Steering Gear Assembly 0.833,4.344 4.5,4.542 3.667,0.198 10 false : CAN Communication Line 4.042,3.729 4.5,3.927 0.458,0.198 10 false C54 0.198,3.396 3.563,3.594 3.365,0.198 10 false *1: except 12.3 Inch TFT Display Type 0.198,3.833 3.563,4.031 3.365,0.198 10 false *2: for 12.3 Inch TFT Display Type 2.208,2.198 3.323,2.625 1.115,0.427 10 false from Engine Start and Stop ECU

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

When replacing the rack and pinion power steering gear assembly, perform Power Steering ECU Initial Setting.

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>UTILITY



PROCEDURE

1.CHECK VEHICLE CONTROL HISTORY
a.

Check the vehicle control history (RoB).

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>VEHICLE CONTROL HISTORY

HINT:

If vehicle control history is stored, the EPS warning light may illuminate.



Result:
Result Proceed to
Vehicle control history of power steering system control does not exist A
Vehicle control history of power steering system control exists B



A

2.CHECK HARNESS AND CONNECTOR

B

PERFORM INSPECTIONS AND REPAIRS ON THE SYSTEM RELATED TO THE VEHICLE CONTROL HISTORY

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>VEHICLE CONTROL HISTORY

NOTICE:

After performing inspections and repairs on the system related to the vehicle control history, clear the vehicle control history.



2.CHECK HARNESS AND CONNECTOR
a.

Jiggle the rack and pinion power steering gear assembly connectors and wire harness up and down, and left and right to check the illumination condition of the EPS warning light in the combination meter assembly.

OK:

The EPS warning light illumination condition does not change.


HINT:

for HV Model:

When the EPS warning light is operating properly, it illuminates when the ignition switch is turned to ON and turns off when the ignition switch is turned to ON (READY).

for Gasoline Model:

When the EPS warning light is operating properly, it illuminates when the ignition switch is ON and turns off when the engine is started.



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - GROUND)
a.

Disconnect the C54 rack and pinion power steering gear assembly connector.


C376308E06
3.417,0.094 3.75,0.333 0.333,0.24 1.75,0.5 1.917,0.5 1.917,0.5 3.479,1.073 true 1.75,1.5 1.917,1.5 1.917,1.5 3.167,1.25 true 4,1.25 5.25,1.5 5.25,1.5 5.417,1.5 true 3.458,0.125 3.802,0.344 0.344,0.219 11 false C54 1.531,0.406 1.875,0.625 0.344,0.219 11 false IG 1.271,1.417 1.833,1.667 0.563,0.25 11 false PGND 5.5,1.406 5.844,1.625 0.344,0.219 11 false PIG 0.177,0.104 0.521,0.323 0.344,0.219 11 false *a

b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
C54-4 (IG) - Body ground Ignition switch ON 8 to 16 V
C54-8 (PIG) - Body ground Always 9 to 16 V



c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
C54-7 (PGND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

4.INSPECT COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR