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.
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HOMESERVICE MANUALSCHEVROLET1999CUTAWAY 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0352-P0452DTC P0401DTC P0401: EGR SYSTEM-INSUFFICIENT FLOW (4.8L, 5.3L & 6.0L "C" & "K" SERIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Cutaway 7.4 J
Diagnostic Procedures
1999 Chevrolet Cutaway 7.4 JSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- If a MAP related DTC is present, diagnose DTC first. If no other DTCs are present, go to next step.
- Inspect exhaust system for modifications from original parts or leaks. Repair as necessary. After repairs, go to step 7. If exhaust system is okay, go to next step.
- Check EGR valve gasket and pipe for leaks. Repair or clean EGR components as necessary. After repairs, go to step 7. If EGR components are okay, go to next step.
- Remove EGR valve. Check EGR pintle and passages for leak or restriction. Repair or replace as necessary. After repairs, go to step 7. If EGR valve is okay, go to next step.
- Remove EGR inlet and outlet pipes from exhaust and intake manifolds. Check for leaks or restrictions. Repair as necessary. After repairs, go to next step. If repairs were not required, problem is intermittent. See DIAGNOSTIC AIDS .
- Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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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.