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 >> P0A01 >> P0A01-726

P0A01-726








P311 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A01-725,P0A01-726: Motor Electronics Coolant Temperature Sensor Circuit Range / Performance

DTC P0A01-725 - Motor Electronics Coolant Temperature Sensor Circuit Range / Performance

DTC P0A01-726 - Motor Electronics Coolant Temperature Sensor Circuit Range / Performance

DESCRIPTION

The hybrid vehicle control ECU detects HV coolant temperature through the coolant temperature sensor built into the inverter with converter assembly. The inverter cooling system is the same as that for MG2 or MG1, and operates independently of the engine cooling system. The hybrid vehicle control ECU controls the inverter cooling system to prevent overheating based on signals from the HV coolant temperature sensor. The ECU also monitors cooling system operation and detects malfunctions in the HV coolant temperature sensor and the circuit.






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 (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:
- 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.
- P0A01-725 or P0A01-726 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 P0A93
C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT
B -- ADD COOLANT
A -- Continue to next step.
4. CHECK COOLANT HOSE P0A93
NG -- CORRECT THE PROBLEM
OK -- Continue to next step.
5. CHECK FUSE (INV W/P FUSE) P0A93
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) P0A93
NG -- CONNECT SECURELY
OK -- Continue to next step.
8. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A93
NG -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
OK -- Continue to next step.
9. CHECK CONNECTOR CONNECTION CONDITION (COOLING FAN MOTOR CONNECTOR) P0A93
NG -- CONNECT SECURELY
OK -- Continue to next step.
10. PERFORM ACTIVE TEST USING TECHSTREAM (DRIVING THE BATTERY COOLING FAN) P0A93
NG -- CHECK COOLING FAN SYSTEM
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
11. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A93
OK -- ADD COOLANT
NG -- Continue to next step.
12. CHECK WATER PUMP WITH MOTOR & BRACKET ASSEMBLY P0A93
NG -- CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT)
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR & BRACKET ASSEMBLY - HV CONTROL ECU) P0A93
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
14. CHECK ENGINE ROOM R/B P0A93
NG -- REPAIR OR REPLACE ENGINE ROOM R/B
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
15. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT) P0A93
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE WATER PUMP WITH MOTOR & BRACKET ASSEMBLY
Diesel-Data.com