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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 213 (ENGINE CONTROLS SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0401: EGR FLOW INSUFFICIENTCONDITIONS FOR RUNNING TEST
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Conditions For Running Test

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Conditions For Running Test
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  • DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0336, P0403, P0404, P0502, P0503, P0506, P0507, P1106, P1107, P1111, P1112, P1114, P1115, P1121, P1122, P1374 or P1404 are not set.
  • The Ignition 1 signal parameter is 11-18 volts.
  • The AC Relay Command parameter does not change.
  • The Current Gear parameter does not change.
  • The Intake Air Temperature (IAT) sensor parameter is 32-212°F (0-100°C).
  • The Engine Coolant Temperature (ECT) sensor parameter is more than 167°F (75°C).
  • The Engine Speed parameter is 1050-1400 RPM.
  • The Manifold Absolute Pressure (MAP) sensor parameter is 15-70 kPa.
  • The Mass Airflow (MAF) sensor parameter does not change more than 2 grams per second.
  • The Barometric Pressure (BARO) parameter is more than 74 kPa.
  • The Throttle Position (TP) sensor parameter is less than one percent.
  • The Vehicle Speed sensor parameter is more than 30 MPH during deceleration.
  • The Idle Air Control (IAC) position parameter does not change more than 5 counts while the above conditions are met.
  • The vehicle will need to be driven more than 50 MPH, and then allowed to decelerate. When the vehicle is decelerating, while meeting all of the criteria listed above, the PCM will enable the EGR flow test to run. As the EGR flow test is running, you will see the desired EGR position parameter and the EGR position sensor parameter on the scan tool momentarily change from zero to a calibrated value above zero. Additionally, the EGR flow test count parameter on the scan tool will increment when each EGR flow test is completed.
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