P0A1B-788 - Drive Motor "A" Control Module
L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A1B-788: Drive Motor "A" Control Module
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.
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, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
NOTICE:
Clearing the DTCs using the Techstream when DTC U0110-159, 160, 656 or 657 are 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.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
PROCEDURE
1. CHECK DTC OUTPUT (HV)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Result:
B -- GO TO DTC CHART
A -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
(a) Turn the power switch off.
(b) Check the connection of the low voltage connector of the inverter with converter assembly.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - ENGINE ROOM R/B NO. 1)
CAUTION:
Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle 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 integration relay from the engine room R/B No. 1.
(c) Disconnect connector A60 from the inverter with converter assembly.
(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.
4. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle 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) Check for arc marks at the bolts for the generator cable.
(c) Check that the bolts for the generator cable are tightened to the specified torque, the generator cable terminals are connected securely, and there are no contact problems.
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, 71 in-lbf)
Result:
C -- REPLACE MALFUNCTIONING PARTS
B -- CONNECT SECURELY
A -- Continue to next step.
5. 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 for arc marks at the bolts for the motor cable.
(c) Check that the bolts for the motor cable are tightened to the specified torque, the motor cable terminals are connected securely, and there are no contact problems.
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, 71 in-lbf)
Result:
C -- REPLACE MALFUNCTIONING PARTS
B -- CONNECT SECURELY
A -- Continue to next step.
6. INSPECT HYBRID VEHICLE TRANSMISSION 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:
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 (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 -- CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)
OK -- Continue to next step.
7. INSPECT HYBRID VEHICLE TRANSMISSION 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:
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 (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 -- CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
8. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)
CAUTION:
Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle 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 hybrid vehicle transmission assembly Components.
(c) Check for arc marks at the bolts for the generator cable.
(d) Check that the bolts for the generator cable are tightened to the specified torque, the generator cable terminals are connected securely, and there are no contact problems.
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, 71 in-lbf)
Result:
C -- REPLACE MALFUNCTIONING PARTS
B -- CONNECT SECURELY
A -- Continue to next step.
9. CHECK GENERATOR CABLE
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
(b) Remove the generator cable from the transmission Components.
(c) 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:
(d) Measure the resistance of each conductor in the generator cable according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE GENERATOR CABLE
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components
10. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)
CAUTION:
Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle 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 hybrid vehicle transmission assembly Components.
(c) Check for arc marks at the bolts for the motor cable.
(d) Check that the bolts for the motor cable are tightened to the specified torque, the motor cable terminals are connected securely, and there are no contact problems.
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, 71 in-lbf)
Result:
C -- REPLACE MALFUNCTIONING PARTS
B -- CONNECT SECURELY
A -- Continue to next step.
11. CHECK MOTOR CABLE
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
(b) Remove the motor cable from the transmission Components.
(c) 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:
(d) Measure the resistance of each conductor in the motor cable according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE MOTOR CABLE
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components