Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Terminals Of Ecu

Toyota Corolla Cross (2022-2025) Service Manual / Steering / Power Assist Systems / Power Steering System / Terminals Of Ecu

TERMINALS OF ECU

CHECK POWER STEERING ECU ASSEMBLY

*a

Component without harness connected

(Power Steering ECU 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 assembly terminals to become 0 V.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I21-1 (IG) - Body ground

IG power source

Ignition switch ON

8 to 16 V

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

CAN communication line

Ignition switch off

54 to 69 Ω

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

Torque sensor 2 signal
  • Ignition switch ON and steering wheel not being turned (without load)*1
  • Engine running and steering wheel not being turned (without load)*2

2.3 to 2.7 V
  • Ignition switch ON and steering wheel being turned to the right with vehicle stopped*1
  • Engine running and steering wheel being turned to the right with vehicle stopped*2

1.2 to 2.5 V
  • Ignition switch ON and steering wheel being turned to the left with vehicle stopped*1
  • Engine running and steering wheel being turned to the left with vehicle stopped*2

2.5 to 3.8 V

z7-2 (TRQG2) - Body ground

Torque sensor 2 ground

Always

Below 1 Ω

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

Torque sensor 2 voltage source

Ignition switch ON

4.5 to 5.5 V

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

Torque sensor 1 voltage source

Ignition switch ON

4.5 to 5.5 V

z7-8 (TRQG1) - Body ground

Torque sensor 1 ground

Always

Below 1 Ω

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

Torque sensor signal
  • Ignition switch ON and steering wheel not being turned (without load)*1
  • Engine running and steering wheel not being turned (without load)*2

2.3 to 2.7 V
  • Ignition switch ON and steering wheel being turned to the right with vehicle stopped*1
  • Engine running and steering wheel being turned to the right with vehicle stopped*2

2.5 to 3.8 V
  • Ignition switch ON and steering wheel being turned to the left with vehicle stopped*1
  • Engine running and steering wheel being turned to the left with vehicle stopped*2

1.2 to 2.5 V

I42-1 (PIG) - Body ground

Power source

Always

9 to 16 V

I42-2 (PGND) - Body ground

Power ground

Always

Below 1 Ω
  • *1: for HEV Model
  • *2: for Gasoline Model

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

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