Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H78S
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 06/2021]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): TERMINALS OF ECU; 2020 - 2021 MY Corolla Corolla HV [01/2019 - 06/2021]

TERMINALS OF ECU

CHECK POWER STEERING ECU WITH MOTOR ASSEMBLY

*a

Component without harness connected

(Power Steering ECU with Motor Assembly)

-

-

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

NOTICE:

When the EPS warning light is illuminated due to a malfunction, the fail-safe function may cause the voltage of the power steering ECU with motor assembly terminals to become 0 V.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I21-1 (IG) - Body ground

P - Body ground

IG power source

Power switch on (IG)

8 to 16 V

I21-7 (CANH) - I21-8 (CANL)

G - W

CAN communication line

Power switch off

54 to 69 Ω

z7-1 (TRQ2) - z7-2 (TRQG2)

Y - G

Torque sensor 2 signal

Power switch on (READY) and steering wheel not being turned (without load)

2.3 to 2.7 V

Power switch on (READY) and steering wheel being turned to the right with vehicle stopped

1.2 to 2.5 V

Power switch on (READY) and steering wheel being turned to the left with vehicle stopped

2.5 to 3.8 V

z7-2 (TRQG2) - Body ground

G - Body ground

Torque sensor 2 ground

Always

Below 1 Ω

z7-3 (TRQV2) - z7-2 (TRQG2)

L - G

Torque sensor 2 voltage source

Power switch on (IG)

4.5 to 5.5 V

z7-7 (TRQV1) - z7-8 (TRQG1)

R - B

Torque sensor 1 voltage source

Power switch on (IG)

4.5 to 5.5 V

z7-8 (TRQG1) - Body ground

B - Body ground

Torque sensor 1 ground

Always

Below 1 Ω

z7-9 (TRQ1) - z7-8 (TRQG1)

W - B

Torque sensor signal

Power switch on (READY) and steering wheel not being turned (without load)

2.3 to 2.7 V

Power switch on (READY) and steering wheel being turned to the right with vehicle stopped

2.5 to 3.8 V

Power switch on (READY) and steering wheel being turned to the left with vehicle stopped

1.2 to 2.5 V

I42-1 (PIG) - Body ground

W - Body ground

Power source

Always

9 to 16 V

I42-2 (PGND) - Body ground

W-B - Body ground

Power ground

Always

Below 1 Ω

If the result is not as specified, the ECU may be malfunctioning.