P0A41
P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A3F-243: Drive Motor "A" Position Sensor Circuit
DTC P0A3F-243 - Drive Motor "A" Position Sensor Circuit
DTC P0A40-500 - Drive Motor "A" Position Sensor Circuit Range / Performance
DTC P0A41-245 - Drive Motor "A" Position Sensor Circuit Low
DESCRIPTION
A resolver is a sensor that detects the position of the magnetic poles, which are indispensable for ensuring highly efficient control of the Motor and Generator.
The resolver stator contains an excitation coil and 2 detection coils. 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 detects the absolute position of the rotor according to the phases of detection coils S and C and the height 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 speed sensor.
The MG ECU monitors signals output from the Motor resolver and detects a malfunction.
MONITOR DESCRIPTION
The MG ECU monitors the motor resolver output signal. If the MG ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction of the motor resolver. The HV control ECU will illuminate the MIL and set a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
NOTE: Check the output DTCs again after the repair has been completed. If P0A78-286, P0A7A-324, or P0A79-696 is output, replace the w/ converter inverter assembly.
HINT:
- At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.
- If the problem symptom cannot be reproduced, performing the driving test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
- If INF code 243 is output, there may be an interphase short in the Motor resolver circuit due to an intrusion of water into the resolver. Therefore, if the problem symptom cannot be reproduced, replace the HV transaxle assembly last.
PROCEDURE
1. CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the ignition switch off and remove the service plug grip. Hybrid Control System
NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
(b) Remove the inverter cover. Components
NOTICE:
- Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
- Prevent water in the reservoir tank from entering the inverter.
- Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
(c) Check the connections of the MG ECU connectors.
OK:
Connectors are connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
2. INSPECT MOTOR RESOLVER
CAUTION: Be sure to wear insulated gloves.
(a) Disconnect the I22 connector from the MG ECU.
(b) Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.
Standard Voltage:
NOTE: Turning the ignition switch to the ON position with the MG ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.
(c) Turn the ignition switch off.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):
Standard Resistance (Check for short):
OK -- CHECK CONNECTION CONDITION OF MOTOR RESOLVER CONNECTOR (LOOSENESS AND POOR CONTACT)
NG -- Continue to next step.
3. CHECK CONNECTION CONDITION OF MOTOR RESOLVER CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connection of the motor resolver connector.
OK:
Connector is connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
4. INSPECT MOTOR RESOLVER
(a) Disconnect the M14 motor resolver connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Using a megohmmeter, measure the insulation resistance according to the value(s) in the table below.
NOTE: Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.
Standard Resistance:
NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR
5. CHECK CONNECTION CONDITION OF MOTOR RESOLVER CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connection of the motor resolver connector.
OK:
Connector is connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- REPLACE W/ CONVERTER INVERTER ASSEMBLY (MG ECU)