Lexus ES manuals

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 Nickel Metal Hydride 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
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
  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off.
  5. 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]
  6. 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.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. 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
  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. 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.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. 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).

(c) Enter the following menus: Powertrain / Engine / Trouble Codes.

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.

B

GO TO DTC CHART (SFI SYSTEM)

A

2.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(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.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

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
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

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)

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

NG

GO TO STEP 9

OK

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
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

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.

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

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.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

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.

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

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.

OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

NG

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

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

OK

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

10.

INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR TEMPERATURE SENSOR)

Click here

OK

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

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

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