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Test 15: Differential Pressure Feedback EGR (DPFE) Sensor

TEST 15: DIFFERENTIAL PRESSURE FEEDBACK EGR (DPFE) SENSOR INSPECTION

TEST 15 DIFFERENTIAL PRESSURE FEEDBACK EGR (DPFE) SENSOR
STEP INSPECTION ACTION
1 CHECK DPFE OUTPUT
  • Connect NGS Tester to DLC.
  • Warm up engine and run at idle.
  • Access DPFEGR PID and record value for the following:
    • Key On Engine Off (KOEO).
    • Hot idle.
    • Driving 48 kmh (30 mph).
    • 88 kmh (55 mph).
  • Are DPFEGR PID values as specified? 
 Yes DPFE sensor is OK.
No Go to step 2.
2 CHECK DPFE SENSOR OUTPUT BY APPLYING VACUUM WITH HAND PUMP
  • Key On Engine Off (KOEO).
  • Access DPFEGR PID on NGS Tester.
  • Disconnect upstream and downstream hoses from sensor.
  • Connect a hand vacuum pump to intake manifold side (downstream side = smaller diameter) of DPFE sensor.
  • Apply vacuum and check PID.
    • The DPFE PID voltage must be between 0.2 and 1.3 volt with the key on and no vacuum applied.
    • The DPFE PID voltage must increase to greater than 4.0 volts with the vacuum applied.
    • The DPFE PID must drop to less than 1.5 volts in less than 3 seconds when vacuum is released.
  • Is PID at specification? 
 Yes DPFE sensor is OK.
Check vacuum line to intake manifold for kinks, clogging or restriction.
Repair or replace as necessary.
No Replace DPFE sensor. See ELECTRICAL COMPONENT LOCATOR article.
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