DTC B2840 [INSTRUMENT CLUSTER]

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DTC B2840 | Ambient temperature sensor circuit malfunction
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DETECTION CONDITION | Open or short circuit in wiring harness between ambient temperature sensor and instrument cluster
POSSIBLE CAUSES | • Open or short circuit in wiring harness between ambient temperature sensor and instrument cluster • Ambient temperature sensor malfunction • Instrument cluster malfunction

System Wiring Diagram

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Diagnostic Procedure

STEP | INSPECTION | ACTION
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1 | INSPECT AMBIENT TEMPERATURE SENSOR CONNECTOR CONDITION • Turn the ignition switch to the LOCK position. • Disconnect the ambient temperature sensor connector. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair/replace the connector or terminal. After repair procedure, go to Step 9.
2 | INSPECT AMBIENT TEMPERATURE SENSOR • Inspect the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is the ambient temperature sensor normal? | Yes | Go to the next step.
No | Replace the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) After replacement, go to Step 9.
3 | INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND • Inspect the wiring harness for continuity between ambient temperature sensor connector terminal B and body ground. • Is there continuity? | Yes | Repair/replace the malfunctioning vehicle wiring harness. After repair procedure, go to Step 9.
No | Go to the next step.
4 | INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position. • Measure the voltage at ambient temperature sensor connector terminal B. • Is the voltage 5 V? | Yes | Go to Step 6.
No | Go to the next step.
5 | INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Measure the voltage at instrument cluster terminal 1I. • Is the voltage 5 V? | Yes | Repair/replace the malfunctioning vehicle wiring harness. After repair procedure, go to Step 9.
No | Go to Step 8.
6 | INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the LOCK position. • Inspect the wiring harness for continuity between ambient temperature sensor connector terminal A and body ground. • Is there continuity? | Yes | Go to Step 9.
No | Go to the next step.
7 | INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between instrument cluster terminal 2P and body ground. • Is there continuity? | Yes | Repair/replace the malfunctioning vehicle wiring harness. After repair procedure, go to Step 9.
No | Go to the next step.
8 | VERIFY INSTRUMENT CLUSTER CONNECTOR CONDITION • Disconnect the instrument cluster connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair/replace the connector or terminal. After repair procedure, go to the next step.
9 | VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • Reconnect the disconnected connectors. • Clear the DTC. (See CLEARING DTC [INSTRUMENT CLUSTER].) • VERIFY DTCs. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Is DTC B2840 output? | Yes | Repeat the inspection from Step 1. • If the malfunction does not recur, go to the next step. • If the malfunction recurs, replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No | Go to the next step.
10 | VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTC displayed. • Are any other DTCs output? | Yes | Perform the corresponding DTC inspection.
No | DTC troubleshooting completed.