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 >> P0A93

P0A93








P311 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A93-346: Inverter Cooling System Performance

DTC P0A93-346 - Inverter Cooling System Performance

DESCRIPTION

The inverter converts the boosted high-voltage direct-current from the HV battery into alternating current for MG2 and MG1. The inverter generates heat during the conversion process, and this heat could damage the inverter if a cooling system is unavailable. Therefore, similar to MG2 and MG1, the inverter is cooled by a special cooling system consisting of an electric water pump, cooling fan, and radiator. This cooling system is independent of the engine cooling system. The hybrid vehicle control ECU monitors the electric water pump, cooling fan, and cooling system, and detects malfunctions.






MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the electric water pump, fan or radiator, the ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





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 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:





HINT:
- *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
- Turning the power switch on (IG) with the service plug grip and inverter cover removed causes interlock switch system DTC P0A0D-350 to be output.
- P0A93-346 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

YES -- GO TO DTC CHART
NO -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0343
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK QUANTITY OF HV COOLANT
(a) Check for coolant leaks.
(b) Check the coolant in the water reserve tank assembly is above the low level.
Result:





HINT: After repairing the coolant leaks and adding coolant, perform the WATER PUMP and COOLING FAN SPD active tests and make sure that there are no malfunctions.

C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT
B -- ADD COOLANT
A -- Continue to next step.
4. CHECK COOLANT HOSE
(a) Check if the hoses of the cooling system are kinked or clogged.





NG -- CORRECT THE PROBLEM
OK -- Continue to next step.
5. CHECK FUSE (INV W/P FUSE)




(a) Remove the INV W/P fuse from the engine room R/B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Install the INV W/P fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
6. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0343
NG -- CONNECT SECURELY
OK -- Continue to next step.
7. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR & BRACKET ASSEMBLY CONNECTOR)




(a) Check the connection of the water pump with motor & bracket assembly connector.
OK:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
8. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
(d) Perform the "Activate the Water Pump" active test.
(e) During the "Activate the Water Pump" active test, open the water reserve tank cap and check that there are ripples in the coolant. Continue the active test for at least 1 minute.
Result:
There are ripples in the coolant in the water reserve tank assembly for 1 minute.
HINT: The water pump motor operates even in inspection mode.

NG -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
OK -- Continue to next step.
9. CHECK CONNECTOR CONNECTION CONDITION (COOLING FAN MOTOR CONNECTOR)




(a) Check the connections of the cooling fan motor connectors.
OK:
The connectors are connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
10. PERFORM ACTIVE TEST USING TECHSTREAM (DRIVING THE BATTERY COOLING FAN)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Engine and ECT / Active Test / Driving the Battery Cooling Fan.
(d) Perform the "Driving the Battery Cooling Fan" active test.
OK:
The cooling fan rotates.
NG -- CHECK COOLING FAN SYSTEM
OK -- Continue to next step.
11. READ VALUE USING TECHSTREAM
(a) Stop the engine and leave the vehicle for at least 1 hour.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Select the following menu items: Powertrain / Hybrid Control / Data List / Inverter Coolant Water Temperature, Inverter Temp-(MG2), Converter Temperature, Inverter Temp-(MG1).
(e) Read the data list.
Result:
The displayed "Inverter Coolant Water Temperature" value is at least 20°C (68°F) higher than "Inverter Temp-(MG2), Converter Temperature, and Inverter Temp-(MG1)".
NOTICE: The lower limit temperature that can be displayed for "Inverter Temp-(MG2), Converter Temperature, and Inverter Temp-(MG1)" is 15°C (59°F). The lower limit temperature for "Inverter Coolant Water Temperature" is -40°C (-40°F). The "Inverter Coolant Water Temperature" value displayed on the Techstream may be lower than the others, but this is not a malfunction.

NG -- REPLACE WATER PUMP WITH MOTOR & BRACKET ASSEMBLY
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
12. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
(a) Connect the Techstream to the DLC3.
(b) Compress the inlet hose for the water pump with motor & bracket assembly several times.
(c) Turn the power switch on (IG).
(d) Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
(e) Perform the "Activate the Water Pump" active test.
(f) During the "Activate the Water Pump" active test, open the water reserve tank cap and check that there are ripples in the coolant. Continue the active test for at least 1 minute.
Result:
There are ripples in the coolant in the water reserve tank assembly for 1 minute.
HINT:
- Keep compressing the water pump inlet hose until the coolant level in the water reserve tank assembly stops dropping.
- The water pump motor operates even in maintenance mode.
- After repairing the coolant leaks and adding coolant, perform the WATER PUMP and COOLING FAN SPD active tests and make sure that there are no malfunctions.

OK -- ADD COOLANT
NG -- Continue to next step.
13. CHECK WATER PUMP WITH MOTOR & BRACKET ASSEMBLY




(a) Disconnect the A61 hybrid vehicle control ECU connector.
(b) Remove the INV W/P fuse from the engine room R/B.
(c) Apply 12 V to terminal 2 of the socket for the fuse in the engine room R/B and check that the water pump operates.
OK:
The water pump operates.
(d) Install the INV W/P fuse to the engine room R/B.
NG -- CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT)
OK -- Continue to next step.
14. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR & BRACKET ASSEMBLY - HV CONTROL ECU)




(a) Disconnect the A65 water pump with motor & bracket assembly connector.
(b) 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.
15. CHECK ENGINE ROOM R/B




(a) Remove the INV W/P fuse from the engine room R/B.
(b) Remove the IGCT relay from the engine room R/B.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE ENGINE ROOM R/B
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
16. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT)
(a) Remove the INV W/P fuse from the engine room R/B.
(b) 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 -- REPLACE WATER PUMP WITH MOTOR & BRACKET ASSEMBLY
Diesel-Data.com