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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