Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GCL7 |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [01/2019 - 09/2022] |
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P312387; Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] |
DTC
|
P312387
|
Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message
|
DESCRIPTION
Refer to the description for P0D2D16.
Click here
The MG ECU, which is built into in the inverter with converter assembly, controls motor (MG2) based on commands from the hybrid vehicle control ECU. The MG ECU monitors communication data and detects malfunctions.
The hybrid vehicle control ECU monitors communication data and detects malfunctions.
A communication error between the MG ECU and the hybrid vehicle control ECU.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Warning Indicate
|
P312387
|
Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message
|
Error in reception from inverter with converter assembly (MG ECU) via serial communication (out of communication standard)
(1 trip detection logic)
|
-
Wire harness or connector
-
Inverter with converter assembly
-
Hybrid vehicle control ECU
-
PCU FR fuse
|
Does not come on
|
Master Warning: Comes on
|
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
-
Connect the Techstream to the DLC3.
-
Turn the power switch on (IG) and turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the power switch off and wait for 2 minutes or more.
-
Turn the power switch on (IG) and turn the Techstream on.
-
With power switch on (IG) and wait for 2 minutes or more.
-
Enter the following menus: Powertrain / Hybrid Control / 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 or N/A, perform driving pattern again.
WIRING DIAGRAM
Refer to the wiring diagram for the inverter low-voltage circuit.
Click here
CAUTION / NOTICE / HINT
CAUTION:
-
Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
-
Inspecting the high-voltage system
-
Disconnecting the low voltage connector of the inverter with converter assembly
-
Disconnecting the low voltage connector of the HV battery
-
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
-
After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here
PROCEDURE
(a) Remove the PCU FR fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
PCU FR fuse
|
Always
|
Below 1 Ω
|
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
PCU FR Fuse
|
|
|
(c) Install the PCU FR fuse.
OK
|
|
|
Click here
NEXT
|
|
|
3.
|
CHECK DIAGNOSIS RELATED INFORMATION AND DTC OUTPUT (HYBRID CONTROL)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and wait for 2 minutes or more.
(c) Enter the following menus: Powertrain / Hybrid Control / Utility / Diagnosis Related Information.
Powertrain > Hybrid Control > Utility
Tester Display
|
Diagnosis Related Information
|
(d) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(e) Check for Diagnosis Related Information and DTCs.
Powertrain > Hybrid Control > Trouble Codes
Result
|
Proceed to
|
P312387 is listed in Diagnosis Related Information or DTC P312387 is output
|
A
|
P312387 is not listed in Diagnosis Information and DTC P312387 is not output
|
B
|
(f) Turn the power switch off.
A
|
|
|
4.
|
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
|
Click here
NG |
|
CONNECT SECURELY
|
OK
|
|
|
5.
|
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
|
Click here
Result
|
Proceed to
|
OK
|
A
|
NG (The connector is not connected securely.)
|
B
|
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)
|
C
|
B |
|
CONNECT SECURELY
|
C |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
A
|
|
|
6.
|
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY POWER SOURCE CIRCUIT)
|
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the C89 inverter with converter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
C89-24 (GND1) - Body ground
|
Power switch off
|
Below 1 Ω
|
C89-23 (GND2) - Body ground
|
Power switch off
|
Below 1 Ω
|
|
|
*a
|
Front view of wire harness connector
(to Inverter with Converter Assembly)
|
|
|
(d) Connect the cable to the negative (-) auxiliary battery terminal.
(e) Turn the power switch on (IG).
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
C89-6 (+B) - Body ground
|
Power switch on (IG)
|
11 to 14 V
|
C89-5 (+B2) - Body ground
|
Power switch on (IG)
|
11 to 14 V
|
NOTICE:
Turning the power switch on (IG) with the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(g) Turn the power switch off.
(h) Disconnect the cable from the negative (-) auxiliary battery terminal.
(i) Reconnect the C89 inverter with converter assembly connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
7.
|
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
|
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the C89 inverter with converter assembly connector.
(c) Disconnect the A57 hybrid vehicle control ECU connector.
(d) Connect the cable to the negative (-) auxiliary battery terminal.
(e) Turn the power switch on (IG).
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A57-14 (HMCL) - Body ground
|
Power switch on (IG)
|
Below 1 V
|
A57-4 (HMCH) - Body ground
|
Power switch on (IG)
|
Below 1 V
|
NOTICE:
Turning the power switch on (IG) with the hybrid vehicle control ECU connector and the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
|
|
*a
|
Front view of wire harness connector
(to Inverter with Converter Assembly)
|
*b
|
Front view of wire harness connector
(to Hybrid Vehicle Control ECU)
|
|
|
(g) Turn the power switch off.
(h) Disconnect the cable from the negative (-) auxiliary battery terminal.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection
|
Condition
|
Specified Condition
|
C89-19 (HMCL) - A57-14 (HMCL)
|
Power switch off
|
Below 1 Ω
|
C89-20 (HMCH) - A57-4 (HMCH)
|
Power switch off
|
Below 1 Ω
|
Standard Resistance (Check for Short):
Tester Connection
|
Condition
|
Specified Condition
|
C89-19 (HMCL) or A57-14 (HMCL) - Body ground and other terminals
|
Power switch off
|
10 kΩ or higher
|
C89-20 (HMCH) or A57-4 (HMCH) - Body ground and other terminals
|
Power switch off
|
10 kΩ or higher
|
HINT:
As there might be an intermittent malfunction, inspect the following items even if the measured resistance is as specified.
Check that each connector between the inverter with converter assembly and hybrid vehicle control ECU is not loose or disconnected.
(j) Reconnect the A57 hybrid vehicle control ECU connector.
(k) Reconnect the C89 inverter with converter assembly connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
8.
|
CHECK HYBRID VEHICLE CONTROL ECU
|
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the C89 inverter with converter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
*a
|
Component with harness connected
(Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A57-14 (HMCL) -A57-4 (HMCH)
|
Power switch off
|
110 to 130 Ω
|
(d) Reconnect the C89 inverter with converter assembly connector.
(a) Replace the PCU FR fuse.
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
PCU FR Fuse
|
|
|
(b) Turn the power switch on (READY).
(c) Check if there is an open circuit in the PCU FR fuse in the No. 1 engine room relay block and No. 1 junction block assembly.
OK:
There is no open circuit in the PCU FR fuse.
HINT:
If the fuse does not become open again after turning the power switch on (READY), it can be assumed that the previous fuse failed due to age.
(d) Turn the power switch off.
OK |
|
END
|
NG
|
|
|
10.
|
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - PCU FR FUSE)
|
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Remove the PCU FR fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
(c) Disconnect the C89 inverter with converter assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
PCU FR Fuse Holder
|
*a
|
Front view of wire harness connector
(to Inverter with Converter Assembly)
|
-
|
-
|
Standard Resistance (Check for Short):
Tester Connection
|
Condition
|
Specified Condition
|
C89-6 (+B), C89-5 (+B2) or 2 (PCU FR fuse holder) - Body ground and other terminals
|
Power switch off
|
10 kΩ or higher
|
(e) Reconnect the C89 inverter with converter assembly connector.
(f) Install the PCU FR fuse.
OK
|
|
|
11.
|
REPLACE INVERTER WITH CONVERTER ASSEMBLY
|
Click here
NEXT |
|
REPLACE FUSE (PCU FR)
|
12.
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
NEXT |
|
REPLACE FUSE (PCU FR)
|
|