DL93 - Wiggle Test Sensor

DIAGNOSTIC TROUBLE CODES (DTC) FOR PRESSURE FEEDBACK EGR (PFE) AND DIFFERENTIAL PRESSURE FEEDBACK EGR (DPFE).

Possible Causes:

DTCs 337 (PFE/DPFE), 336 (PFE/DPFE)

- Open in PFE/DPFE SIG RTN circuit.

- Short to PWR or VREF in PFE/DPFE Signal circuit.

DTC 336 (PFE)

- Obstructed PFE sensor inlet.

DTCs 327 (PFE/DPFE), 326 (PFE)

- Open in PFE/DPFE Signal circuit.

- Open in PFE/DPFE VREF circuit.

- Short to GND in either PFE/DPFE Signal or VREF circuits.

DTCs 327 (PFE), 326 (PFE), 336 (DPFE), 337 (DPFE)

- EGR valve sticking open.

- EGR Vacuum (EGRV) solenoid sticking open.

- EVR solenoid vent restricted.

- EVR solenoid driver shorting to GND.

NOTE: All circuit faults can be in the component, harness or Powertrain Control Module (PCM).

- Enter Engine Running Continuous Monitor test mode. Continuous Monitor Diagnostic Test Mode (Wiggle Test)

- Observe Analog Volt/Ohm Meter (VOM) or STAR LED or indication of a fault while performing the following:

- Lightly tap on PFE/DPFE sensor and wiggle the sensor vehicle harness connector (to simulate road shock).

- Is a fault indicated?

Yes -- Inspect connectors and terminals. If OK, replace PFE/DPFE sensor. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Go to DL94. DL94 - Wiggle Test EEC-IV Vehicle Harness