Lexus ES: Drive Motor "A" Temperature Sensor Voltage Out of Range (P0A2A1C,P0A2A1F)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System (for Lithium-ion Battery) / Drive Motor "A" Temperature Sensor Voltage Out of Range (P0A2A1C,P0A2A1F)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs are stored when the motor temperature sensor output is abnormal. The cause of this malfunction may be one of the following:

Motor temperature sensor malfunction

Internal motor temperature sensor malfunction
Open or short in motor temperature sensor

Wire harness between the motor temperature sensor and hybrid vehicle control ECU

The connectors are not connected properly
Foreign matter or water on the connector terminals
Open or short in wire harness

HINT:

If any of these DTCs are stored, the motor temperature sensor is malfunctioning and the self-protection function may not operate. Therefore under certain high load driving condition, the temperature of the motor (MG2) becomes high. If the self-protection function does not operate, the motor (MG2) may malfunction and cause the vehicle to enter fail-safe mode.

DESCRIPTION

Refer to the description for DTC P0A2A11.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0A2A1C	Drive Motor "A" Temperature Sensor Voltage Out of Range	After a long soak, the value of the motor (MG2) temperature sensor is different from the value of the other temperature sensors. (2 trip detection logic)	Wire harness or connector Motor temperature sensor (Hybrid vehicle transaxle assembly)	Comes on	Master Warning Light: Comes on
P0A2A1F	Drive Motor "A" Temperature Sensor Circuit Intermittent	Sudden change in motor temperature sensor output or hunting: Unusual sudden change in motor temperature sensor output occurs and offset condition continues for a certain period of time, or unusual change in motor temperature sensor output occurs repeatedly. (1 trip detection logic)	Wire harness or connector Motor temperature sensor (Hybrid vehicle transaxle assembly)	Comes on	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A2A1C

Drive Motor "A" Temperature Sensor Voltage Out of Range

After a long soak, the value of the motor (MG2) temperature sensor is different from the value of the other temperature sensors.

(2 trip detection logic)

Wire harness or connector
Motor temperature sensor (Hybrid vehicle transaxle assembly)

Comes on

Master Warning Light:

Comes on

P0A2A1F

Drive Motor "A" Temperature Sensor Circuit Intermittent

Sudden change in motor temperature sensor output or hunting:

Unusual sudden change in motor temperature sensor output occurs and offset condition continues for a certain period of time, or unusual change in motor temperature sensor output occurs repeatedly.

(1 trip detection logic)

Wire harness or connector
Motor temperature sensor (Hybrid vehicle transaxle assembly)

Comes on

Master Warning Light:

Comes on

Related Data List

DTC No.	Data List
P0A2A1C	Generator Temperature Motor Temperature Inverter Coolant Water Temperature
P0A2A1F	Motor Temperature

MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the motor temperature sensor, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0A2B (INF P0A2A1C): Drive Motor "A" Temperature Sensor Circuit Range/Performance P0A2E (INF P0A2A1F): Drive Motor "A" Temperature Sensor Circuit Intermittent
Required sensors/components	Motor temperature sensor
Frequency of operation	Continuous
Duration	TMC's intellectual property
MIL operation	2 driving cycle / 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 P0A2B (INF P0A2A1C) is not detected

DTC P0A2E (INF P0A2A1F) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

DTC P0A2A1C

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.
Leave the vehicle as is for 5 hours or more and then check the values of the Data List items "Generator Temperature", "Motor Temperature" and "Inverter Coolant Water Temperature". [*1]
Turn the power switch on (IG) and turn the Techstream on. [*2]
HINT:

[*1] to [*2]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

DTC P0A2A1F

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 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
With power switch on (IG) and wait for 5 seconds or more. [*1]
HINT:

[*1] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A2A11.

Click here

PROCEDURE

1.	CHECK DTC OUTPUT (ENGINE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

Powertrain > Engine > Trouble Codes

(d) Check for DTCs.

Result	Proceed to
No DTCs are output, or DTCs except the ones in the table below are also output	A
Any of the following DTCs are also output	B

Relevant DTC
P261029	ECM/PCM Engine Off Timer Performance Signal Invalid

(e) Turn the power switch off.

GO TO DTC CHART (SFI SYSTEM)

2.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
No DTCs are output, or DTCs except the ones in the table below are also output	A
Any of the following DTCs are also output	B

Relevant DTC
P0A2A11	Drive Motor "A" Temperature Sensor Circuit Short to Ground
P0A2A15	Drive Motor "A" Temperature Sensor Circuit Short to Auxiliary Battery or Open

(e) Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

3.	CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (MOTOR TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the A32 hybrid vehicle control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A32-24 (MMT) - A32-23 (MMTG)	Power switch off	0.3443 to 1446 kΩ

*a	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

GO TO STEP 9

5.	CHECK CONNECTOR CONNECTION CONDITION (INTERMEDIATE CONNECTOR)

Click here

Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the CA3 No. 1 engine room relay block and No. 1 junction block assembly connector.

(b) Disconnect the A32 hybrid vehicle control ECU connector.

HINT:

When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
CA3-4 (MMT) - A32-24 (MMT)	Power switch off	Below 1 Ω
CA3-16 (MMTG) - A32-23 (MMTG)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
CA3-4 (MMT) or A32-24 (MMT) - Body ground and other terminals	Power switch off	10 kΩ or higher
CA3-16 (MMTG) or A32-23 (MMTG) - Body ground and other terminals	Power switch off	10 kΩ or higher

(d) Reconnect the A32 hybrid vehicle control ECU connector.

(e) Reconnect the CA3 No. 1 engine room relay block and No. 1 junction block assembly connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK CONNECTOR CONNECTION CONDITION (MOTOR TEMPERATURE SENSOR CONNECTOR)

Click here

Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - MOTOR TEMPERATURE SENSOR)

(a) Disconnect the C90 motor temperature sensor connector.

(b) Disconnect the CA3 No. 1 engine room relay block and No. 1 junction block assembly connector.

HINT:

When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
CA3-4 (MMT) - C90-1 (MMT)	Power switch off	Below 1 Ω
CA3-16 (MMTG) - C90-2 (MMTG)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
CA3-4 (MMT) or C90-1 (MMT) - Body ground and other terminals	Power switch off	10 kΩ or higher
CA3-16 (MMTG) or C90-2 (MMTG) - Body ground and other terminals	Power switch off	10 kΩ or higher

(d) Reconnect the CA3 No. 1 engine room relay block and No. 1 junction block assembly connector.

(e) Reconnect the C90 motor temperature sensor connector.

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR TEMPERATURE SENSOR)

(a) Disconnect the CA3 No. 1 engine room relay block and No. 1 junction block assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
CA3-4 (MMT) - CA3-16 (MMTG)	Power switch off	0.3443 to 1446 kΩ

REPAIR OR REPLACE HARNESS OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)

10.	INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR TEMPERATURE SENSOR)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - MOTOR TEMPERATURE SENSOR)

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

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Lexus ES: Drive Motor "A" Temperature Sensor Voltage Out of Range (P0A2A1C,P0A2A1F)

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