DESCRIPTION
If the ignition switch is ON, the hybrid vehicle control ECU applies current to the MREL terminal to turn the IGCT relay on. This supplies power to the +B1 terminal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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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 |
---|---|---|
I249-8 (+B1) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Turn the ignition switch off.
NG | GO TO STEP 3 |
|
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 |
---|---|---|
A192-12 (E01) - Body ground |
Always | Below 1 Ω |
A192-24 (E12) - Body ground |
Always | Below 1 Ω |
I249-1 (E1) - Body ground |
Always | Below 1 Ω |
(c) Reconnect the hybrid vehicle control ECU connectors.
OK | GO TO PROBLEM SYMPTOMS TABLE |
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 |
---|---|---|
I249-10 (MREL) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Turn the Ignition switch off.
NG | REPLACE HYBRID VEHICLE CONTROL ECU |
|
4. | CHECK FUSE (PM-IGCT) |
(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.
NG | GO TO STEP 11 |
|
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.
NG | GO TO STEP 12 |
|
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:
|
|
(c) Install the IGCT-MAIN NO. 1 relay.
NG | REPLACE RELAY (IGCT-MAIN NO. 1) |
|
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 |
---|---|---|
I249-8 (+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 |
|
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 |
|
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 |
---|---|---|
I249-10 (MREL) - 1 (IGCT-MAIN NO. 1 relay holder) |
Always | Below 1 Ω |
I249-10 (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 |
|
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.
OK | CHECK FOR INTERMITTENT PROBLEMS |
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 |
---|---|---|
I249-8 (+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 (IGCT SCENE) |
NG | GO TO STEP 13 |
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) |
NG | GO TO STEP 14 |
13. | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NEXT | REPLACE FUSE (IGCT-MAIN NO. 1) |
14. | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NEXT | REPLACE FUSE (IGCT-MAIN NO. 1) |