Diesel Data: Automotive Repair
Home >> Toyota >> 2009 >> Camry L4-2.4L (2AZ-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0A1B >> P0A1B-788

P0A1B-788








P311 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A1B-788: Drive Motor "A" Control Module

DTC P0A1B-788 - Drive Motor "A" Control Module

DESCRIPTION

If the inverter with converter assembly (MG ECU) is reset due to a problem with the power source in the inverter, the hybrid vehicle control ECU will set this DTC.





HINT: Clearing the DTCs using the Techstream when DTC U0110-657 is detected and the problem is still occurring will cause DTC P0A1B-788 to be stored. However, it is not necessary to perform inspection for DTC P0A1B-788 because DTC P0A1B-788 indicates a communication system malfunction.

MONITOR DESCRIPTION

If an abnormal power source IC CPU reset is detected in the MG ECU, 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 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 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.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0343
NG -- CONNECT SECURELY
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - ENGINE ROOM R/B)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip Hybrid Control System.
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) Remove the IGCT relay from the engine room R/B.
(c) Disconnect the A62 inverter with converter assembly connector.
(d) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)
CAUTION: Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.




(b) Check that the bolts for the motor cable are tightened to the specified torque.
NOTICE: Make sure that the tightening torque of the bolts is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).

Torque: 8.0 Nm (82 kgf-cm, 71in-lbf)
NG -- TIGHTEN TO SPECIFIED TORQUE
OK -- Continue to next step.
4. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)
CAUTION: Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.




(b) Check that the bolts for the generator cable are tightened to the specified torque.
NOTICE: Make sure that the tightening torque of the bolts is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).

Torque: 8.0 Nm (82 kgf-cm, 71in-lbf)
NG -- TIGHTEN TO SPECIFIED TORQUE
OK -- Continue to next step.
5. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1)
CAUTION: Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
(b) Disconnect the generator cable and motor cable from the inverter with converter assembly Components.




(c) Using a milliohmmeter, measure the resistance according to the value(s) in the table below. (Check MG1 for an interphase short.)
HINT: If the MG1 temperature is high, the resistance varies greatly. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

Standard resistance:





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) (mOhms)
Rt: Measured resistance (mOhms)
T: Temperature when the resistance is measured (°C)
(d) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
NOTICE: 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 -- Continue to next step.
6. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG2)
CAUTION: Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
(b) Disconnect the generator cable and motor cable from the inverter with converter assembly Components.




(c) Using a milliohmmeter, measure the resistance according to the value(s) in the table below. (Check MG2 for an interphase short.)
HINT: If the MG2 temperature is high, the resistance varies greatly. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

Standard resistance:





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) (mOhms)
Rt: Measured resistance (mOhms)
T: Temperature when the resistance is measured (°C)
(d) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
NOTICE: 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 -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
Diesel-Data.com