RM38N0EC _55 Steering _111819 POWER ASSIST SYSTEMS _0501137 POWER STEERING SYSTEM J

POWER ASSIST SYSTEMS  POWER STEERING SYSTEM  EPS Warning Light Circuit  


DESCRIPTION

for HV Model:

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.


for Gasoline Model:

Perform the following troubleshooting procedure when the EPS warning light remains on after the engine is started, 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

C475230E02
3.333,1.813 3.792,2.01 0.458,0.198 10 false EPS 3.146,2.427 3.917,2.625 0.771,0.198 10 false EPS-IGR*1 5.344,1.542 5.51,1.708 0.167,0.167 10 false 8 5.354,2.167 5.521,2.333 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 5.625,0.375 6.24,0.573 0.615,0.198 10 false CANH 5.625,0.917 6.24,1.115 0.615,0.198 10 false CANL 5.302,0.24 5.615,0.438 0.313,0.198 10 false 10 5.302,0.76 5.615,0.958 0.313,0.198 10 false 11 5.354,3.125 5.51,3.323 0.156,0.198 10 false 7 5.625,3.26 6.24,3.458 0.615,0.198 10 false PGND 1.469,0.385 1.917,0.583 0.448,0.198 10 false CANH 1.469,0.917 1.917,1.083 0.448,0.167 10 false CANL 2.448,0.156 2.844,0.417 0.396,0.26 10 false 32*4 2.458,0.708 2.865,0.917 0.406,0.208 10 false 31*4 0.281,1.26 2.219,1.51 1.938,0.25 10 false Combination Meter Assembly 2.896,2.885 3.896,3.417 1,0.531 10 false from Stop and Start System*2 4.677,3.969 7.094,4.385 2.417,0.417 10 false Power Steering ECU (Rack and Pinion Power Steering Gear Assembly) 0.833,4.344 4.5,4.542 3.667,0.198 10 false : CAN Communication Line 4.677,3.792 5.135,3.99 0.458,0.198 10 false C37 0.198,3.031 2.167,3.25 1.969,0.219 10 false *1: for HV Model 0.198,3.333 2.083,3.583 1.885,0.25 10 false *2: for Gasoline Model 0.198,3.635 2,3.833 1.802,0.198 10 false *3: for TFT Meter Type 0.208,3.948 2.083,4.167 1.875,0.219 10 false *4: for Optitron Meter Type 1.958,0.375 2.458,0.625 0.5,0.25 10 false E142 1.958,0.906 2.49,1.198 0.531,0.292 10 false E142 2,0.156 2.417,0.406 0.417,0.25 10 false 31*3 2.01,0.708 2.427,0.917 0.417,0.208 10 false 14*3 2.458,0.375 2.917,0.573 0.458,0.198 10 false E17 2.448,0.906 3.219,1.104 0.771,0.198 10 false E17

CAUTION / NOTICE / HINT

NOTICE:
·

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



PROCEDURE

1.CHECK VEHICLE CONTROL HISTORY (RoB)
a.

Check the vehicle control history (RoB).

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>VEHICLE CONTROL HISTORY (RoB)

HINT:

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



Result:
Result Proceed to
Vehicle control history (RoB) of power steering system control does not exist A
Vehicle control history (RoB) 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 (RoB)

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>VEHICLE CONTROL HISTORY (RoB)

NOTICE:

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



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 ON (READY).


for Gasoline Model:

When the EPS warning light is operating properly, it illuminates when the ignition switch is turned to 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 C37 rack and pinion power steering gear assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(C37)Location & Routing

Click Connector(C37)Engine Compartment>Engine Wire>Power Steering ECU with Motor Assembly (Rack and Pinion Power Steering Gear Assembly)

C37-4 (IG) - Body ground Ignition switch ON 11 to 14 V
C37-8 (PIG) - Body ground Ignition switch ON 11 to 14 V



c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(C37)Location & Routing

Click Connector(C37)Engine Compartment>Engine Wire>Power Steering ECU with Motor Assembly (Rack and Pinion Power Steering Gear Assembly)

C37-7 (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