| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM10000000257FB |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): C155A16,C155A17,C155B16,C155B17; Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
C155A16 |
Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold |
|
DTC |
C155A17 |
Power Steering Motor "A" Supply Voltage Circuit Voltage Above Threshold |
|
DTC |
C155B16 |
Power Steering Motor "B" Supply Voltage Circuit Voltage Below Threshold |
|
DTC |
C155B17 |
Power Steering Motor "B" Supply Voltage Circuit Voltage Above Threshold |
DESCRIPTION
If a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Return-to-normal Condition |
Note |
|---|---|---|---|---|---|---|
|
C155A16 |
Power Steering Motor "A" Supply Voltage Circuit Voltage Below Threshold |
Motor "1" PIG voltage is 3.6 V or less |
|
EPS warning light: Comes on |
Power switch on (IG) again |
- |
|
C155A17 |
Power Steering Motor "A" Supply Voltage Circuit Voltage Above Threshold |
Diagnosis Condition: IG ON Malfunction Status: Motor "1" PIG voltage is 19.6 V or more |
|
EPS warning light: Comes on |
Power switch on (IG) again |
- |
|
C155B16 |
Power Steering Motor "B" Supply Voltage Circuit Voltage Below Threshold |
Motor "2" PIG voltage is 3.6 V or less |
|
EPS warning light: Comes on |
Power switch on (IG) again |
- |
|
C155B17 |
Power Steering Motor "B" Supply Voltage Circuit Voltage Above Threshold |
Diagnosis Condition: IG ON Malfunction Status: Motor "2" PIG voltage is 19.6 V or more |
|
EPS warning light: Comes on |
Power switch 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 (POWER STEERING ECU ASSEMBLY - BODY GROUND) |
(a) Disconnect the I42 power steering ECU assembly connectors.
|
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(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 |
|
|