| 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.
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