P0A4C

P112 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

The generator resolver detects the position of the magnetic poles, which are indispensable for ensuring the highly efficient control of the MG1 and MG2. The construction of the generator resolver and how it is connected to the HV control ECU are the same as those of the motor resolver P0A3F.

The motor resolver is a type of sensor that detects the position of the magnetic poles, which are indispensable for ensuring the highly efficient control of the MG1 and MG2.
The stator of the resolver contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and the rotor changes as the rotor turns. 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 position of the sensor rotor.
The HV control ECU detects the absolute position of the rotor in accordance with the phases of detection coils S and C and the height of their waveform. 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 HV control ECU monitors the output signals of the motor resolver and detects a malfunction.






MONITOR DESCRIPTION

The HV control ECU monitors the generator resolver output signal. If the HV control 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 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
HINT:
- If INF code 253 is stored and the malfunction cannot be reproduced, replace the hybrid vehicle generator (MG1) as the last step.
- When measuring insulation resistance using a megohmmeter, set the megohmmeter to 500 V.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR RESOLVER)




(a) Disconnect the H17 HV control ECU connector.




(b) Disconnect the M5 generator resolver connector.
(c) Turn the power switch ON (IG).
(d) Measure the voltage between the terminals of the HV control ECU connector and body ground.
Standard voltage:





(e) Turn the power switch OFF.
(f) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):





Standard resistance (Check for short)





(g) Reconnect the generator resolver connector.
(h) Reconnect the HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. INSPECT GENERATOR RESOLVER
(a) Disconnect the M5 generator resolver connector.




(b) Measure the resistance between the terminals of the generator resolver.
Standard resistance:





(c) Using a megohmmeter set to 500 V, measure the insulation resistance between the terminals of the generator resolver.
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 GENERATOR ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU