DTC B1B71:14 [INSTRUMENT CLUSTER]

id0902e8998900

Description

Evaporator temperature sensor circuit malfunction

Detection condition

•  The instrument cluster detected an open circuit or a short to ground in the evaporator temperature sensor circuit for 0.1 s or more with the ignition switched ON (engine off or on).

Fail-safe

Not applicable

Possible cause

•  Evaporator temperature sensor connector or terminal malfunction

•  Instrument cluster connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  Instrument cluster terminal 2O—Evaporator temperature sensor terminal B

―  Instrument cluster terminal 2P—Evaporator temperature sensor terminal A

•  Open circuit in wiring harness between the following terminals:

―  Instrument cluster terminal 2O—Evaporator temperature sensor terminal B

―  Instrument cluster terminal 2P—Evaporator temperature sensor terminal A

•  Evaporator temperature sensor malfunction

•  Instrument cluster malfunction

Description	Evaporator temperature sensor circuit malfunction
Detection condition	• The instrument cluster detected an open circuit or a short to ground in the evaporator temperature sensor circuit for 0.1 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	• Evaporator temperature sensor connector or terminal malfunction • Instrument cluster connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Instrument cluster terminal 2O—Evaporator temperature sensor terminal B ― Instrument cluster terminal 2P—Evaporator temperature sensor terminal A • Open circuit in wiring harness between the following terminals: ― Instrument cluster terminal 2O—Evaporator temperature sensor terminal B ― Instrument cluster terminal 2P—Evaporator temperature sensor terminal A • Evaporator temperature sensor malfunction • Instrument cluster malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT EVAPORATOR TEMPERATURE SENSOR CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Disconnect the evaporator temperature sensor connector.

•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

2

INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION

•  Disconnect the instrument cluster connector.

•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

3

INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND

•  Verify that the evaporator temperature sensor and instrument cluster connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:

―  Evaporator temperature sensor terminal B

―  Evaporator temperature sensor terminal A

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

•  Instrument cluster terminal 2O—Evaporator temperature sensor terminal B

•  Instrument cluster terminal 2P—Evaporator temperature sensor terminal A

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

Go to Step 6.

No

Go to the next step.

4

INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT

•  Verify that the evaporator temperature sensor and instrument cluster connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side):

―  Instrument cluster terminal 2O—Evaporator temperature sensor terminal B

―  Instrument cluster terminal 2P—Evaporator temperature sensor terminal A

•  Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

•  Instrument cluster terminal 2O—Evaporator temperature sensor terminal B

•  Instrument cluster terminal 2P—Evaporator temperature sensor terminal A

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has an open circuit.

Go to Step 6.

5

INSPECT EVAPORATOR TEMPERATURE SENSOR

•  Inspect the evaporator temperature sensor.
(See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

•  Is the evaporator temperature sensor normal?

Yes

Go to the next step.

No

Replace the evaporator temperature sensor, then go to the next step.

(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

6

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Always reconnect all disconnected connectors.

•  Connect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Clear the DTC for the instrument cluster using the M-MDS.
(See CLEARING DTC [INSTRUMENT CLUSTER].)

•  Switch the ignition ON (engine off or on) and wait for 1 s or more.

•  Retrieve the instrument cluster DTCs using the M-MDS.
(See DTC INSPECTION [INSTRUMENT CLUSTER].)

•  Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

7

VERIFY IF OTHER DTCs DISPLAYED

•  Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT EVAPORATOR TEMPERATURE SENSOR CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Disconnect the evaporator temperature sensor connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 6.
2	INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION • Disconnect the instrument cluster connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 6.
3	INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND • Verify that the evaporator temperature sensor and instrument cluster connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Evaporator temperature sensor terminal B ― Evaporator temperature sensor terminal A • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Instrument cluster terminal 2O—Evaporator temperature sensor terminal B • Instrument cluster terminal 2P—Evaporator temperature sensor terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 6.
3		No	Go to the next step.
4	INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Verify that the evaporator temperature sensor and instrument cluster connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Instrument cluster terminal 2O—Evaporator temperature sensor terminal B ― Instrument cluster terminal 2P—Evaporator temperature sensor terminal A • Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Instrument cluster terminal 2O—Evaporator temperature sensor terminal B • Instrument cluster terminal 2P—Evaporator temperature sensor terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 6.
5	INSPECT EVAPORATOR TEMPERATURE SENSOR • Inspect the evaporator temperature sensor. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is the evaporator temperature sensor normal?	Yes	Go to the next step.
5		No	Replace the evaporator temperature sensor, then go to the next step. (See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the instrument cluster using the M-MDS. (See CLEARING DTC [INSTRUMENT CLUSTER].) • Switch the ignition ON (engine off or on) and wait for 1 s or more. • Retrieve the instrument cluster DTCs using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) Go to the next step.
6		No	Go to the next step.
7	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [INSTRUMENT CLUSTER].)
7		No	DTC troubleshooting completed.