LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2017 >> Legacy 2.5i Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Control System (Diagnostics) (P0161 To P0685) (H6DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0400 EGR "A" Flow >> Diagnostic Method

Diagnostic Method

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

Measure the pressure values when the enable conditions are established, and perform diagnosis by calculating those results.

  1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are established, and set the EGR target step to 50 step(s) (nearly full open).
  2. Label the intake manifold pressure value as PMON, which is observed after 1000 ms has passed since EGR target step was set to 50 step(s) (when the enable conditions were established), and set the EGR target step to 0.
  3. Label the intake manifold pressure as PMOF2, which is observed after 1000 ms has passed since EGR target step was set to 0 (after (1000 ms + 1000 ms) have passed since the enable conditions were established).

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
PMON - (PMOF1 + PMOF2)/2 < 2.5 kPa (18.63 mmHg, 0.7 inHg)

Time Needed for Diagnosis:  1000 ms x 2

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Fig 1: Intake Manifold Pressure Graph
G11589094Courtesy of SUBARU OF AMERICA, INC.