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. Standard Voltage:
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(c) Turn the power switch off.
NG | GO TO STEP 3 |
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2. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND) |
(a) Disconnect the G59 and G60 hybrid vehicle control ECU connectors.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(c) Reconnect the G59 and G60 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 VOLTAGE) |
(a) Turn the power switch on (IG).
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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(c) Turn the power switch off.
NG | REPLACE HYBRID VEHICLE CONTROL ECU |
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4. | CHECK FUSE (PM-IGCT) |
(a) Remove the PM-IGCT fuse from the No. 4 relay block. |
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(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 12 |
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5. | CHECK FUSIBLE LINK BLOCK ASSEMBLY (IGCT FUSE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the cable from the positive (+) auxiliary battery terminal.
(c) Disconnect the 7A fusible link block assembly connector. | |
(d) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(e) Reconnect the 7A fusible link block assembly connector.
(f) Reconnect the cable to the positive (+) auxiliary battery terminal.
(g) Reconnect the cable to the negative (-) auxiliary battery terminal.
NG | GO TO STEP 13 |
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6. | INSPECT RELAY (IGCT) |
(a) Remove the IGCT relay from the No. 3 relay block. |
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(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(c) Install the IGCT relay.
NG | REPLACE RELAY (IGCT) |
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7. | CHECK HARNESS AND CONNECTOR (NO. 4 RELAY BLOCK - HYBRID VEHICLE CONTROL ECU) |
(a) Disconnect the A32 and A33 hybrid vehicle control ECU connectors.
(b) Remove the PM-IGCT fuse from the No. 4 relay block.
(c) Measure the resistance according to the value(s) in the table below.
*1 | No. 4 Relay Block | *2 | PM-IGCT Fuse Holder |
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU) | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A33-4 (+B1) - 2 (PM-IGCT fuse holder) | Always | Below 1 Ω |
A32-1 (+B2) - 2 (PM-IGCT fuse holder) | Always | Below 1 Ω |
(d) Reconnect the A32 and A33 hybrid vehicle control ECU connectors.
(e) Install the PM-IGCT fuse.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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8. | CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK - NO. 4 RELAY BLOCK) |
(a) Remove the IGCT relay from the No. 3 relay block.
(b) Remove the PM-IGCT fuse from the No. 4 relay block.
(c) Measure the resistance according to the value(s) in the table below.
*1 | No. 3 Relay Block | *2 | No. 4 Relay Block |
*3 | IGCT Relay Holder | *4 | PM-IGCT Fuse Holder |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
5 (IGCT relay holder) - 1 (PM-IGCT fuse holder) | Always | Below 1 Ω |
(d) Install the PM-IGCT fuse.
(e) Install the IGCT relay.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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9. | CHECK HARNESS AND CONNECTOR (FUSIBLE LINK BLOCK ASSEMBLY - NO. 3 RELAY BLOCK) |
(a) Disconnect the 7A fusible link block assembly connector.
(b) Remove the IGCT relay from the No. 3 relay block. |
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
3 (IGCT relay holder) - 7A-1 | Always | Below 1 Ω |
(d) Install the IGCT relay.
(e) Reconnect the 7A fusible link block assembly connector.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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10. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 3 RELAY BLOCK) |
(a) Disconnect the A33 hybrid vehicle control ECU connector.
(b) Remove the IGCT relay from the No. 3 relay block.
(c) Measure the resistance according to the value(s) in the table below.
*1 | No. 3 Relay Block | *2 | IGCT Relay Holder |
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU) | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A33-6 (MREL) - 1 (IGCT relay holder) | Always | Below 1 Ω |
A33-6 (MREL) or 1 (IGCT relay holder) - Body ground and other terminals | Always | 10 kΩ or higher |
(d) Install the IGCT relay.
(e) Reconnect the A33 hybrid vehicle control ECU connector.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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11. | CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK - BODY GROUND) |
(a) Remove the IGCT relay from the No. 3 relay block.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(c) Install the IGCT relay.
OK | CHECK FOR INTERMITTENT PROBLEMS |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
12. | CHECK HARNESS AND CONNECTOR (NO. 4 RELAY BLOCK - HYBRID VEHICLE CONTROL ECU) |
(a) Remove the PM-IGCT fuse from the No. 4 relay block.
(b) Disconnect the A32 and A33 hybrid vehicle control ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
*1 | No. 4 Relay Block | *2 | PM-IGCT Fuse Holder |
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU) | - | - |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A33-4 (+B1) or 2 (PM-IGCT fuse holder) - Body ground and other terminals | Always | 10 kΩ or higher |
A32-1 (+B2) or 2 (PM-IGCT fuse holder) - Body ground and other terminals | Always | 10 kΩ or higher |
(d) Reconnect the A32 and A33 hybrid vehicle control ECU connectors.
(e) Install the PM-IGCT fuse.
OK | REPLACE FUSE (PM-IGCT) |
NG | GO TO STEP 15 |
13. | CHECK HARNESS AND CONNECTOR (FUSIBLE LINK BLOCK ASSEMBLY - NO. 3 RELAY BLOCK) |
(a) Disconnect the 7A fusible link block assembly connector.
(b) Remove the IGCT relay from the No. 3 relay block.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(d) Install the IGCT relay.
(e) Reconnect the 7A fusible link block assembly connector.
NG | GO TO STEP 16 |
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14. | CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK - NO. 4 RELAY BLOCK) |
(a) Remove the IGCT relay from the No. 3 relay block.
(b) Remove the PM-IGCT fuse from the No. 4 relay block.
(c) Measure the resistance according to the value(s) in the table below.
*1 | No. 3 Relay Block | *2 | No. 4 Relay Block |
*3 | IGCT Relay Holder | *4 | PM-IGCT Fuse Holder |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
5 (IGCT relay holder) or 1 (PM-IGCT fuse holder) - Body ground and other terminals | Always | 10 kΩ or higher |
(d) Install the PM-IGCT fuse.
(e) Install the IGCT relay.
OK | REPLACE FUSIBLE LINK BLOCK ASSEMBLY (IGCT FUSE) |
NG | GO TO STEP 17 |
15. | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NEXT | REPLACE FUSE (PM-IGCT) |
16. | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NEXT | REPLACE FUSIBLE LINK BLOCK ASSEMBLY (IGCT FUSE) |
17. | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NEXT | REPLACE FUSIBLE LINK BLOCK ASSEMBLY (IGCT FUSE) |