DTC P040D: EGR Temperature Sensor "A" Circuit High: Notes

WARNING: This page is about a different variant/trim than selected.

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DTC detecting condition:

Immediately at fault recognition

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Courtesy of SUBARU OF AMERICA, INC.

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, read the value of [Exhaust Gas Recirculation Temperature Sensor A (B1-S1)] of the data monitor.
  NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .
  
  Is the value of [Exhaust Gas Recirculation Temperature Sensor A (B1-S1)] -40[°C] (-40°F) or less?
  
  Yes: Go to 2.
  
  No: 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.
CHECK FOR POOR CONTACT .
Check for poor contact of ECM connector and EGR temperature sensor connector.

Is there poor contact of ECM connector or EGR temperature sensor connector?

Yes: Repair the poor contact of ECM or EGR temperature sensor connector.

No: Go to 3.
CHECK HARNESS BETWEEN ECM CONNECTOR AND EGR TEMPERATURE SENSOR CONNECTOR (OPEN) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connector from EGR temperature sensor.
4. Measure the resistance of the harness between ECM connector and EGR temperature sensor connector.
  Connector & terminal
  
  (E158) No. 58 - (E176) No. 1:
  
  (E158) No. 31 - (E176) No. 2:
  
  Is the resistance less than 1 Ω?
  
  Yes: Go to 4.
  
  No: Repair the open circuit in harness between ECM connector and EGR temperature sensor connector.
CHECK HARNESS BETWEEN ECM AND EGR TEMPERATURE SENSOR CONNECTOR (SHORT TO POWER SUPPLY) .
1. Turn the ignition switch to ON.
2. Measure the voltage between ECM connector and engine ground.
  Connector & terminal
  
  (E158) No. 31 (+) - Engine ground (-):
  
  Is the voltage 5 V or more?
  
  Yes: Repair the short circuit to power supply in harness between ECM connector and EGR temperature sensor connector.
  
  No: Replace the EGR temperature sensor. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>EGR TEMPERATURE SENSOR .