Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001N40H |
Model Year Start: 2021 |
Model: Corolla |
Prod Date Range: [04/2020 - 09/2022] |
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): ECU Power Source Circuit; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022] |
DESCRIPTION
If the power switch is on (IG), the hybrid vehicle control ECU applies current to the MREL terminal to turn the IGCT relay on. This supplies power to the +B1 and +B2 terminals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
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.
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PROCEDURE
1.
|
CHECK HYBRID VEHICLE CONTROL ECU (+B1, +B2 VOLTAGE)
|
(a) Turn the power switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
*a
|
Component with harness connected
(Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A57-11 (+B1) - Body ground
|
Power switch on (IG)
|
11 to 14 V
|
I3-1 (+B2) - Body ground
|
Power switch on (IG)
|
11 to 14 V
|
(c) Turn the power switch off.
OK
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)
|
(a) Disconnect the I2 and I3 hybrid vehicle control ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
*a
|
Front view of wire harness connector
(to Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I3-3 (E1) - Body ground
|
Always
|
Below 1 Ω
|
I2-12 (E01) - Body ground
|
Always
|
Below 1 Ω
|
I2-11 (E02) - Body ground
|
Always
|
Below 1 Ω
|
I2-34 (E12) - Body ground
|
Always
|
Below 1 Ω
|
(c) Reconnect the I2 and I3 hybrid vehicle control ECU connectors.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
3.
|
CHECK HYBRID VEHICLE CONTROL ECU (MREL VOLTAGE)
|
(a) Turn the power switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
*a
|
Component with harness connected
(Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A57-5 (MREL) - Body ground
|
Power switch on (IG)
|
11 to 14 V
|
(c) Turn the power switch off.
OK
|
|
|
(a) Remove the PM-IGCT fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
PM-IGCT Fuse
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
PM-IGCT fuse
|
Always
|
Below 1 Ω
|
(c) Install the PM-IGCT fuse.
OK
|
|
|
(a) Remove the IGCT-IG fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
IGCT-IG Fuse
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
IGCT-IG fuse
|
Always
|
Below 1 Ω
|
(c) Install the IGCT-IG fuse.
OK
|
|
|
(a) Remove the IGCT relay from the No. 1 engine room relay block and No. 1 junction block assembly.
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
IGCT Relay
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
3 - 5
|
Auxiliary battery voltage not applied between terminals 1 and 2
|
10 kΩ or higher
|
Auxiliary battery voltage applied between terminals 1 and 2
|
Below 1 Ω
|
|
|
(c) Install the IGCT relay.
NG |
|
REPLACE RELAY (IGCT)
|
OK
|
|
|
7.
|
CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
|
(a) Disconnect the A57 and I3 hybrid vehicle control ECU connectors.
(b) Remove the PM-IGCT fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
(c) 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
|
PM-IGCT Fuse Holder
|
*a
|
Front view of wire harness connector
(to Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A57-11 (+B1) - 2 (PM-IGCT fuse holder)
|
Always
|
Below 1 Ω
|
I3-1 (+B2) - 2 (PM-IGCT fuse holder)
|
Always
|
Below 1 Ω
|
(d) Install the PM-IGCT fuse.
(e) Reconnect the A57 and I3 hybrid vehicle control ECU connectors.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
8.
|
CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)
|
(a) Remove the IGCT-IG fuse, PM-IGCT fuse and IGCT relay 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
|
3 (IGCT relay holder) - 2 (IGCT-IG fuse holder)
|
Always
|
Below 1 Ω
|
5 (IGCT relay holder) - 1 (PM-IGCT fuse holder)
|
Always
|
Below 1 Ω
|
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
PM-IGCT Fuse Holder
|
*3
|
IGCT-IG Fuse Holder
|
*4
|
IGCT Relay Holder
|
|
|
(c) Install the IGCT-IG fuse, PM-IGCT fuse and IGCT relay.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
9.
|
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)
|
(a) Disconnect the A57 hybrid vehicle control ECU connector.
(b) Remove the IGCT relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(c) 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
|
IGCT Relay Holder
|
*a
|
Front view of wire harness connector
(to Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A57-5 (MREL) - 1 (IGCT relay holder)
|
Always
|
Below 1 Ω
|
A57-5 (MREL) or 1 (IGCT relay holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
(d) Install the IGCT relay.
(e) Reconnect the A57 hybrid vehicle control ECU connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
10.
|
CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - BODY GROUND)
|
(a) Remove the IGCT relay 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
|
2 (IGCT relay holder) - Body ground
|
Always
|
Below 1 Ω
|
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
IGCT Relay Holder
|
|
|
(c) Install the IGCT relay.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
11.
|
CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
|
(a) Remove the PM-IGCT fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the A57 and I3 hybrid vehicle control ECU connectors.
(c) 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
|
PM-IGCT Fuse Holder
|
*a
|
Front view of wire harness connector
(to Hybrid Vehicle Control ECU)
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A57-11 (+B1) or 2 (PM-IGCT fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
I3-1 (+B2) or 2 (PM-IGCT fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
(d) Reconnect the A57 and I3 hybrid vehicle control ECU connectors.
(e) Install the PM-IGCT fuse.
OK |
|
REPLACE FUSE (PM-IGCT)
|
12.
|
CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)
|
(a) Remove the IGCT-IG fuse, PM-IGCT fuse and IGCT relay 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
|
3 (IGCT relay holder) or 2 (IGCT-IG fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
5 (IGCT relay holder) or 1 (PM-IGCT fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
|
|
*1
|
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
|
*2
|
PM-IGCT Fuse Holder
|
*3
|
IGCT-IG Fuse Holder
|
*4
|
IGCT Relay Holder
|
|
|
(c) Install the IGCT-IG fuse, PM-IGCT fuse and IGCT relay.
OK |
|
REPLACE RELAY (IGCT-IG)
|
13.
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
NEXT |
|
REPLACE FUSE (PM-IGCT)
|
14.
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
NEXT |
|
REPLACE FUSE (IGCT-IG)
|
|