DESCRIPTION
The cause of the malfunction may be the low-voltage circuit.
Check whether there is an open circuit in the inverter +B low-voltage power source system or a problem in the communication between the hybrid vehicle control ECU and inverter.
Related Parts Check Area | Inspection |
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Inverter +B low-voltage power source system check | Check for inverter overcurrent malfunction. |
Communication malfunction between hybrid vehicle control ECU and MG-ECU inside inverter with converter assembly | Check for inverter overcurrent malfunction due to communication malfunction. |
Check for short to ground in inverter +B low-voltage power source system | - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
This diagnostic procedure is referenced to in the diagnostic procedure of several DTCs.
If the result of this diagnostic procedure is normal, proceed as directed in the procedure for the DTC.
CAUTION:
*a | Without waiting for 10 minutes |
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HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
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 FUSE (PCU) |
(a) Remove the PCU 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 |
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PCU fuse | Always | Below 1 Ω |
(c) Install the PCU fuse.
NG | GO TO STEP 5 |
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2. | 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 A58 inverter with converter assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(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 |
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A58-6 (+B) - Body ground | Power switch on (IG) | Same as auxiliary battery voltage |
A58-5 (+B2) - Body ground | Power switch on (IG) | Same as auxiliary battery voltage |
NOTICE:
Turning the power switch on (IG) with the inverter with converter assembly connector 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 and wait for 2 minutes or more.
(i) Reconnect the A58 inverter with converter assembly connector.
NG | REPAIR OR REPLACE POWER SOURCE CIRCUIT |
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3. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) |
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 A58 inverter with converter assembly connector.
(c) Disconnect the A33 hybrid vehicle control ECU connector.
(d) Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
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(e) Connect the cable to the negative (-) auxiliary battery terminal.
(f) Turn the power switch on (IG).
(g) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
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A58-20 (HMCH) or A33-31 (HMCH) - Body ground and other terminals | Power switch on (IG) | Below 1 V |
A58-19 (HMCL) or A33-30 (HMCL) - Body ground and other terminals | Power switch on (IG) | Below 1 V |
NOTICE:
Turning the power switch on (IG) with the hybrid vehicle control ECU and inverter with converter assembly connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(h) Turn the power switch off.
(i) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 2 minutes or more.
(j) Reconnect the A33 hybrid vehicle control ECU connector.
(k) Reconnect the A58 inverter with converter assembly connector.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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4. | CHECK HYBRID VEHICLE CONTROL ECU |
(a) Disconnect the A33 hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(c) Reconnect the A33 hybrid vehicle control ECU connector.
OK | INVERTER LOW-VOLTAGE CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC) |
NG | REPLACE HYBRID VEHICLE CONTROL ECU |
5. | CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - PCU 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) Disconnect the A58 inverter with converter assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(d) Reconnect the A58 inverter with converter assembly connector.
NG | GO TO STEP 7 |
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6. | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
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NEXT | REPLACE FUSE (PCU) |
7. | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NEXT | REPLACE FUSE (PCU) |