ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0545 EXHAUST GAS TEMPERATURE SENSOR CIRCUIT MALFUNCTION (LOW INPUT)

ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0545 EXHAUST GAS TEMPERATURE SENSOR CIRCUIT MALFUNCTION (LOW INPUT)

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode , and Inspection Mode .

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK CURRENT DATA. 1) Start the engine. 2) Read the data of “Catalyst Temperature #11” using the Subaru Select Monitor or a general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”. • General scan tool For detailed operation procedures, refer to the general scan tool operation manual.	Is the data of “Catalyst Temperature #11” 1000°C (1832°F)?		Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2.CHECK HARNESS BETWEEN ECM AND EXHAUST TEMPERATURE SENSOR 1 CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from the ECM and exhaust temperature sensor 1. 3) Measure the resistance between ECM connector and chassis ground. Connector & terminal (B135) No. 34 — Chassis ground:	Is the resistance 1 MΩ or more?	Replace the exhaust temperature sensor 1.	Repair the short circuit to ground in harness between ECM connector and exhaust temperature sensor 1 connector.