| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000257F7 |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): C123A17; Supply Voltage Circuit Circuit Voltage Above Threshold; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
C123A17 |
Supply Voltage Circuit Circuit Voltage Above Threshold |
DESCRIPTION
The power steering ECU assembly distinguishes the power switch status as on (IG) or off through the IG power source circuit.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Return-to-normal Condition |
Note |
|---|---|---|---|---|---|---|
|
C123A17 |
Supply Voltage Circuit Circuit Voltage Above Threshold |
IG voltage is 18.5 V or more |
|
EPS warning light: Comes on |
The ECU judges the system has returned to normal or the power switch is turned on (IG) again |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER STEERING ECU ASSEMBLY) |
(a) Disconnect the I42 and I21 power steering ECU assembly connectors.
|
*a |
Front view of wire harness connector (to Power Steering ECU Assembly) |
- |
- |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I21-1 (IG) - Body ground |
Power switch on (IG) |
8 to 16 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I42-2 (PGND) - Body ground |
Always |
Below 1 Ω |
| OK |
|
REPLACE POWER STEERING ECU ASSEMBLY
|
![2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL](/t3Portal/stylegraphics/info.gif)
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|