Diagnostic Aids
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the sensing element for contamination and clean it if possible. If the sensing element cannot be cleaned - Replace the sensor.
- When the EGR valve is closed, the ideal Induction System Leak Indication parameter is 1. 0: 1; the normal range is between 0. 80: 1 and 1. 20: 1.
- A scan tool Induction System Leak Indication parameter greater than 1. 20: 1, when the EGR valve is commanded closed, may indicate:
- A leak after the turbocharger
- An inaccurate MAP sensor
- An inaccurate IAT sensor 3
- A skewed MAF sensor
- A scan tool Induction System Leak Indication parameter less than 0. 80: 1, when the EGR valve is commanded closed, may indicate:
- A leak before the turbocharger
- An inaccurate MAP sensor
- An inaccurate IAT sensor 3
- A skewed MAF sensor
- A leaking EGR valve, when it is commanded closed
- A leaking positive crankcase valve (PCV) system