Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (EGR FUNCTION TESTING - DIESEL GENERAL MOTORS)GENERAL MOTORSTEST 3DIESEL (2001-13)
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Diesel (2001-13)
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Diesel (2001-13)
WARNING: This page is about a different variant/trim than selected.
- The barometric pressure (BARO) is at least 72 kPa.
- Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
- Start and allow the engine to idle for 2 minutes.
- Observe the DTC Information with a scan tool.
If scan tool shows failed EGR DTCs, follow appropriate diagnostic information.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.