Lexus NX: Motor Electronics Coolant Temperature Sensor Circuit Low (P0A02-719,P0A03-720)
DESCRIPTION
Refer to the description for DTC P0A01-726.
Click here .gif)
| 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 |
Click here
| NEXT | .gif) | COMPLETED |
READ NEXT:
DC / DC Converter Status Circuit (P0A08-264)
DESCRIPTION The DC/DC converter converts the DC 244.8 V of the HV battery into DC 12 V in order to supply power to areas such as the vehicle's lighting, audio, and ECU systems. In addition, it charges
DC / DC Converter Status Circuit Low Input (P0A09-265)
DESCRIPTION Refer to the description for DTC P0A08-264. Click here The hybrid vehicle control ECU sends a signal to the DC/DC converter to prohibit its control and receives signals indicating a nor
DC / DC Converter Status Circuit Low Input (P0A09-591)
DESCRIPTION The DC/DC converter varies output voltage based on voltage change signals (VLO signal line) received from the hybrid vehicle control ECU. If the vehicle is being driven with an inoperative
SEE MORE:
Removal
REMOVAL PROCEDURE 1. DISCONNECT INTAKE MANIFOLD Click here 2. DISCONNECT FUEL TUBE SUB-ASSEMBLY (a) Remove the No. 1 fuel pipe clamp from the fuel tube sub-assembly. Click here (b) Disconnect the fuel tube sub-assembly from the fuel pipe. Click here 3. REMOVE FUEL DELIVERY P
Terminals Of Ecu
TERMINALS OF ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
*1: w/ Manual (SOS) Switch
*2: It is connected, but not used *3: w/o Manual (SOS) Switch #: There is no wire color information I151-1 (GND1) - Body ground W-B - Body ground
