HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P1CAD49,P1C651F,P1CB038; Drive Motor "A" Position Sensor Internal Electronic Failure; 2023 - 2025 MY Corolla HV [09/2022

The motor generator control ECU (MG ECU), which is built into the inverter with converter assembly, monitors its internal operation and detects malfunctions.

Although the DTC titles refer to the generator control module, these DTCs relate to the motor control module.

MONITOR DESCRIPTION

The motor generator control ECU performs diagnostic tests to verify proper operation of internal ECU systems. In one of those tests, the motor generator control ECU checks for an R/D (Resolver/ Digital converter) malfunction involving the motor resolver. If the motor generator control ECU detects an R/D converter error, it will conclude that there is an internal malfunction involving the motor resolver. The motor generator control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and wait for 5 seconds or more.* [*1]
*: Lightly wiggle the connectors and wire harnesses up and down and right and left.
Turn the ignition switch to ON (READY) and wait for 5 seconds or more. [*2]
Depress the accelerator pedal of the vehicle with the engine stopped and the shift lever in P to start the engine. [*3]
Keep the engine running for 5 seconds or more. [*4]
Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more. [*5]
Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more. [*6]
HINT:

[*1] to [*6]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

HINT:

If the problem symptom cannot be reproduced, performing a road test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
If the resolver is malfunctioning, the vehicle may not drive smoothly.
When inspecting the connectors, if it is difficult to judge if a connector was disconnected, deformed or improperly secured, disconnect and reconnect the connector and then check for DTCs again. Check if the same DTC is output. If the same DTC is not output, improper connection of connectors is suspected.
As a malfunction detection threshold may be exceeded when performing the vibration or heat connector inspections, make sure to perform the following inspection to check that the DTC was not stored due to the malfunction of a part.
P1CAD49, P1C651F and P1CB038 may be output as a result of the malfunction indicated by the DTCs in table below.
1. The chart above is listed in inspection order of priority.
2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

PROCEDURE

If the "Rear Motor Resolver Circuit" inspection results are normal, perform the next step.