Lexus NX: Motor Electronics Coolant Temperature Sensor Circuit Low (P0A02-719,P0A03-720)
DESCRIPTION
Refer to the description for DTC P0A01-726.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P0A02-719 | Motor Electronics Coolant Temperature Sensor Circuit Low | Short to ground in the HV coolant temperature sensor circuit (1 trip detection logic) | Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| P0A03-720 | Motor Electronics Coolant Temperature Sensor Circuit High | Open or short to +B in the HV coolant temperature sensor circuit (1 trip detection logic) | Inverter with converter assembly | Comes on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0A02-719 | Inverter Coolant Water Temperature |
| P0A03-720 |
MONITOR DESCRIPTION
If the MG ECU detects a malfunction in the HV coolant temperature sensor circuit, it outputs a malfunction signal to the hybrid vehicle control ECU.
Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A02 (INF 719): Motor Electronics Coolant Temperature malfunction (GND short) P0A03 (INF 720): Motor Electronics Coolant Temperature malfunction (+B short and Disconnection) |
| Required sensors/components | HV coolant temperature sensor |
| Frequency of operation | Continuous |
| Duration | TMC's intellectual property |
| MIL operation | 1 driving cycle |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not stored | TMC's intellectual property |
| Other conditions belong to TMC's intellectual property | - |
TYPICAL MALFUNCTION THRESHOLDS
| TMC's intellectual property | - |
COMPONENT OPERATING RANGE
| Hybrid vehicle control ECU | DTC P0A02 (INF 719) is not detected DTC P0A03 (INF 720) is not detected |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 30 seconds or more.
- Turn the power switch on (IG) and turn the Techstream on.
-
With the shift lever in P, wait for 5 seconds or more.
HINT:
Check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).
- Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
-
Read the current DTCs.
HINT:
- If a current DTC is output, the system is malfunctioning.
- If a current DTC is not output and want to confirm permanent DTC, perform the following procedure.
- Check that permanent DTCs are cleared. If no permanent DTC is output, the system is normal.
- If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.
CAUTION / NOTICE / HINT
HINT:
After the repair, clear the DTCs. If "Inverter Coolant Water Temperature" does not show an abnormal value (110°C (230°F) or -50°C (-58°F)) when the power switch is turned on (IG), the condition is judged as normal.
(If a Low malfunction exists in the HV coolant temperature sensor wiring, 110°C (230°F) is displayed and if a High malfunction exists, -50°C (-58°F) is displayed.)
PROCEDURE
| 1. | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
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| NEXT | .gif) | COMPLETED |
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected
Parts Location
PARTS LOCATION ILLUSTRATION *1 FUEL INJECTOR ASSEMBLY *2 FUEL PUMP *3 FUEL SENDER GAUGE ASSEMBLY *4 EFI-MAIN RELAY *5 EFI-MAIN NO. 2 RELAY *6 ECM *7 FUEL PUMP CONTROL ECU ASSEMBLY *8 NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - EFI-MAIN NO. 1 FU
