DESCRIPTION
The cause of this malfunction may be the motor resolver.
Check the motor resolver internal resistance and the connection condition from the inverter to the resolver.
Related Parts Check Area | Inspection |
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Wire harness and connector between the inverter and motor resolver | Check for short circuit between wire harness and +B side. |
Resolver, wire harness, connector | Check the internal resistance of resolver (including wire harness), body ground resistance, and connector connection condition. |
Resolver | Check for open or short circuit of the resolver |
SYSTEM DESCRIPTION
A resolver is a sensor that is used to detect the position of the magnetic poles of the rotor of a motor. Knowing the position of the poles is indispensable for ensuring precise control of the motor (MG2).
Each resolver contains a stator that has an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor turns because the rotor is oval shaped. An alternating current with a predetermined frequency flows through the excitation coil, and detection coils S and C output alternating currents in accordance with the sensor rotor position.
The MG ECU, which is built into the inverter with converter assembly, detects the absolute position of the rotor according to the phases of detection coils S and C and the heights of their waveforms. Furthermore, the CPU calculates the amount of change in the position within a predetermined length of time, in order to use the resolver as a revolution speed sensor.
The MG ECU monitors signals output from the motor resolver and detects malfunctions.
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 |
Click here
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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HINT:
PROCEDURE
1. | CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) |
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 C89 inverter with converter assembly connector.
(c) Connect the cable to the negative (-) auxiliary battery terminal.
(d) Turn the power switch on (IG).
(e) Measure the voltage according to the value(s) in the table below. Standard Voltage:
NOTICE: Turning the power switch on (IG) with the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. |
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(f) Turn the power switch off.
(g) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 2 minutes or more.
(h) Reconnect the C89 inverter with converter assembly connector.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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2. | CHECK MOTOR RESOLVER |
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 C89 inverter with converter assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT: To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F). R20 = Rt / {1 + 0.00393 X (T - 20)} The calculation is based on the following: R20: Resistance at 20°C (68°F) (mΩ) Rt: Measured resistance (mΩ) T: Temperature when the resistance is measured (°C (°F).) Standard Resistance (Check for Short):
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(d) Reconnect the C89 inverter with converter assembly connector.
OK | MOTOR RESOLVER CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC) |
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3. | CHECK CONNECTOR CONNECTION CONDITION (RESOLVER CONNECTOR) |
(a) Check the connection condition of the resolver connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter. Click here OK: - The connector is connected securely. - The terminals are not deformed and are connected securely. - No water or foreign matter in the connector. | |
Result | Proceed to |
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OK | A |
NG (The connector is not connected securely.) | B |
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) | C |
B | CONNECT SECURELY |
C | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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4. | INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR RESOLVER) |
(a) Disconnect the C91 resolver connector. | |
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT: To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F). R20 = Rt / {1 + 0.00393 X (T - 20)} The calculation is based on the following: R20: Resistance at 20°C (68°F) (mΩ) Rt: Measured resistance (mΩ) T: Temperature when the resistance is measured (°C (°F).) Standard Resistance (Check for Short):
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(c) Reconnect the C91 resolver connector.
OK | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NG | REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY |