Circuit/System Verification
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.
- Ignition - On / Vehicle - In Service Mode
- Verify there are no DTCs set related to the following system/component:
- B34 Engine Coolant Temperature Sensor
- B66 Intake Air Temperature Sensor
- B75C Multifunction Intake Air Sensor
- Q17 Fuel Injector
- If a related DTC is set
- Go to next step: If a related DTC is not set
- Verify the scan tool parameter:
- Exhaust Gas Temperature Sensor 1 = Temperature Versus Resistance - Exhaust Gas Temperature Sensor - The value should be within the range listed in the table.
- Exhaust Gas Temperature Sensor 2 = Temperature Versus Resistance - Exhaust Gas Temperature Sensor - The value should be within the range listed in the table.
- If not the specified value
Replace the appropriate component: B131 Exhaust Temperature Sensor
- Go to next step: If the specified value
- Verify the following conditions do not exist:
- Exhaust System - Leaking/Missing components/Restricted - Refer to: Exhaust Leakage
- Charge Air Duct - Leaking/Loose/Restricted
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no condition exists
- Perform the scan tool control function: DPF Service Regeneration
- Verify sensor 2 is at least 100°C (180°F) warmer than sensor 1:
- Exhaust Gas Temperature Sensor 1
- Exhaust Gas Temperature Sensor 2
- If sensor 2 is not at least 100°C (180°F) warmer than sensor 1
Replace the component: Oxidation Catalytic Converter
- Go to next step: If sensor 2 is at least 100°C (180°F) warmer than sensor 1
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
Replace the component: Oxidation Catalytic Converter
- Go to next step: If the DTC does not set
- If the DTC sets
- All OK.