P0A4D
P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A4B-253: Generator Position Sensor Circuit
DTC P0A4B-253 - Generator Position Sensor Circuit
DTC P0A4C-513 - Generator Position Sensor Circuit Range / Performance
DTC P0A4D-255 - Generator Position Sensor Circuit Low
DESCRIPTION
A resolver is a sensor that is used to detect the position of the magnetic poles of a motor rotor. Knowing the position of the poles is indispensable for ensuring precise control of a motor generator.
The resolver structure and method of connection with the MG ECU are the same as those of the motor resolver P0A3F.
The MG ECU monitors output signals from the resolver and detects a malfunction.
MONITOR DESCRIPTION
The MG ECU monitors the generator 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 generator resolver. The hybrid vehicle 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 or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally 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. After waiting for 5 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
NOTE: Check the output DTCs again after the repair has been completed. If P0A78-286, P0A7A-324, or P0A79-696 is output, replace the inverter with converter assembly.
HINT:
- Waiting for at least 5 minutes is required to discharge the high-voltage capacitor inside the inverter with converter 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 253 is output, there may be an interphase short in the resolver circuit due to an intrusion of water into the resolver. Therefore, if the problem symptom cannot be reproduced, replace the hybrid vehicle transaxle assembly.
PROCEDURE
1. CHECK CONNECTOR CONNECTION CONDITION (MG ECU CONNECTOR)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off.
(b) Remove the service plug grip Removal.
NOTE: 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.
(c) Remove the inverter cover Removal.
NOTICE:
- Wrap the round interlock terminal for the inverter cover with insulating tape to prevent it from shorting to ground.
- Be sure to prevent coolant in the inverter reserve 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.
(d) Check the connections of the MG ECU connectors.
OK:
The connectors are connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
2. INSPECT GENERATOR RESOLVER
NOTE: Be sure to wear insulated gloves.
(a) Disconnect the B49 connector from the MG ECU.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NOTE: Turning the power switch on (IG) with the MG ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.
(d) Turn the power switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
NG -- CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
OK -- Continue to next step.
3. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
(a) Remove the inverter with converter assembly Removal.
(b) Check the connection of the generator resolver connector.
OK:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
4. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
(a) Remove the inverter with converter assembly Removal.
(b) Check the connection of the generator resolver connector.
OK:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
5. CHECK GENERATOR RESOLVER
(a) Disconnect the B53 generator 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