Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026PUM |
Model Year Start: 2023 |
Model: Corolla HV |
Prod Date Range: [09/2022 -
] |
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): ECU Power Source Circuit; 2023 - 2025 MY Corolla HV [09/2022 - ] |
DESCRIPTION
If the ignition switch is ON, the hybrid vehicle control ECU applies current to the MREL terminal to turn the IGCT-MAIN NO. 1 relay on. This supplies power to the +B1 terminal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
|
CHECK HYBRID VEHICLE CONTROL ECU (+B1 VOLTAGE)
|
(a) Turn the ignition switch to ON.
(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
|
I3-8 (+B1) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
(c) Turn the ignition switch off.
OK
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)
|
(a) Disconnect the hybrid vehicle control ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A161-12 (E01) - Body ground
|
Always
|
Below 1 Ω
|
A161-24 (E12) - Body ground
|
Always
|
Below 1 Ω
|
I3-1 (E1) - Body ground
|
Always
|
Below 1 Ω
|
(c) Reconnect the hybrid vehicle control ECU connectors.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
3.
|
CHECK HYBRID VEHICLE CONTROL ECU (MREL TERMINAL VOLTAGE)
|
(a) Turn the ignition switch to ON.
(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
|
I3-10 (MREL) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
(c) Turn the Ignition switch off.
OK
|
|
|
(a) Remove the PM-IGCT 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
|
PM-IGCT fuse
|
Always
|
Below 1 Ω
|
(c) Install the PM-IGCT fuse.
OK
|
|
|
5.
|
CHECK FUSE (IGCT-MAIN NO. 1)
|
(a) Remove the IGCT-MAIN NO. 1 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
|
IGCT-MAIN NO. 1 fuse
|
Always
|
Below 1 Ω
|
(c) Install the IGCT-MAIN NO. 1 fuse.
OK
|
|
|
6.
|
INSPECT RELAY (IGCT-MAIN NO. 1)
|
(a) Remove the IGCT-MAIN NO. 1 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 - 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-MAIN NO. 1 relay.
NG |
|
REPLACE RELAY (IGCT-MAIN NO. 1)
|
OK
|
|
|
7.
|
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)
|
(a) Disconnect the hybrid vehicle control ECU connector.
(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.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I3-8 (+B1) - 2 (PM-IGCT fuse holder)
|
Always
|
Below 1 Ω
|
(d) Install the PM-IGCT fuse.
(e) Reconnect the hybrid vehicle control ECU connector.
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-MAIN NO. 1 fuse, PM-IGCT fuse and IGCT-MAIN NO. 1 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
|
5 (IGCT-MAIN NO. 1 relay holder) - 2 (IGCT-MAIN NO. 1 fuse holder)
|
Always
|
Below 1 Ω
|
3 (IGCT-MAIN NO. 1 relay holder) - 1 (PM-IGCT fuse holder)
|
Always
|
Below 1 Ω
|
(c) Install the IGCT-MAIN NO. 1 fuse, PM-IGCT fuse and IGCT-MAIN NO. 1 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 hybrid vehicle control ECU connector.
(b) Remove the IGCT-MAIN NO. 1 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.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I3-10 (MREL) - 1 (IGCT-MAIN NO. 1 relay holder)
|
Always
|
Below 1 Ω
|
I3-10 (MREL) or 1 (IGCT-MAIN NO. 1 relay holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
(d) Install the IGCT-MAIN NO. 1 relay.
(e) Reconnect the 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-MAIN NO. 1 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-MAIN NO. 1 relay holder) - Body ground
|
Always
|
Below 1 Ω
|
(c) Install the IGCT-MAIN NO. 1 relay.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
11.
|
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)
|
(a) Remove the PM-IGCT fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the hybrid vehicle control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I3-8 (+B1) or 2 (PM-IGCT fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
(d) Reconnect the hybrid vehicle control ECU connector.
(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-MAIN NO. 1 fuse, PM-IGCT fuse and IGCT-MAIN NO. 1 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
|
5 (IGCT-MAIN NO. 1 relay holder) or 2 (IGCT-MAIN NO. 1 fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
3 (IGCT-MAIN NO. 1 relay holder) or 1 (PM-IGCT fuse holder) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
(c) Install the IGCT-MAIN NO. 1 fuse, PM-IGCT fuse and IGCT-MAIN NO. 1 relay.
OK |
|
REPLACE FUSE (IGCT-MAIN NO. 1)
|
13.
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
NEXT |
|
REPLACE FUSE (PM-IGCT)
|
14.
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
NEXT |
|
REPLACE FUSE (IGCT-MAIN NO. 1)
|
|