1999 Chevrolet Cutaway 7.4 JFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedures

  1. 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.
    2. NOTE: Diagnose and repair any Electronic Throttle Control (ETC) DTCs before proceeding.
  2. If any other DTCs are set, diagnose affected DTC(s). If no other DTCs are set, go to next step.
  3. Visually inspect throttle body. Ensure throttle valve is in closed position. If throttle is closed, go to next step. If throttle valve is not closed, go to step  7.
  4. Using scan tool, monitor TP sensors No. 1 and No. 2 voltages. TP sensor No. 1 voltage should be.16-.80 volt. TP sensor No. 2 voltage should be 4.0-5.0 volts. If voltages are as specified, go to step  8. If voltages are not as specified, go to next step.
  5. Check TP sensors No. 1 and No. 2 circuit for open or short to ground. If circuit is faulty, go to next step. If circuit is okay, go to step  8.
  6. Repair as necessary. After repairs, go to step  9.
  7. Repair sticking or binding throttle valve. After repairs, go to step  9.
  8. Replace ECM. New ECM must be programmed with theft deterrent module frequency code currently on vehicle. After replacing module, go to next step.
  9. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions that set 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.
  10. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.