SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2000CAB & CHASSIS K2500, 7.4 J, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 122 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L)DIAGNOSTIC TESTSDTC P0106: MAP SYSTEM PERFORMANCEDIAGNOSTIC PROCEDURES
2000 Chevrolet Cab & Chassis K2500, 7.4 J, Automatic

Diagnostic Procedures

2000 Chevrolet Cab & Chassis K2500, 7.4 J, AutomaticSECTION Diagnostic Procedures
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Is the vehicle equipped with electronic throttle control (ETC)? If yes, go to step  4. If no, go to next step.
  3. Install a scan tool. Turn ON the ignition, with the engine OFF. Observe the throttle angle parameter with a scan tool. Move the throttle slowly from closed to wide open position. Does the throttle angle move steadily and completely from 0% to above 98%? If yes, go to next step. If no, see DTC P0121: TP SENSOR PERFORMANCE .
  4. Observe the MAP sensor pressure with a scan tool. Compare this value to value observed in a known-good vehicle. Is the difference between the vehicles less than 3 kPa? If yes, go to next step. If no, go to step  9.
  5. Observe the MAP sensor pressure on the scan tool. Start the engine. Does the MAP sensor change value? If yes, go to next step. If no, go to step  9.
  6. Turn OFF the ignition. Remove the MAP sensor from the vacuum source. Leave the electrical harness connected. Connect a hand vacuum pump to the MAP sensor port. Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure as you SLOWLY apply vacuum 1 in. Hg at a time. Each inch of vacuum should result in a 3-4 kPa drop in the MAP sensor pressure. Does the scan tool indicate that the MAP sensor is operating normally? If yes, go to next step. If no, go to step  17.
  7. Observe the MAP sensor pressure with 20 in. Hg applied to the MAP sensor. Does the scan tool indicate that the MAP sensor pressure is less than 34 kPa? If yes, go to next step. If no, go to step  9.
  8. Disconnect the MAP sensor from the hand vacuum pump. Does the MAP sensor pressure return to the original value that was observed in step  4? If yes, see DIAGNOSTIC AIDS . If no, go to step  17.
  9. Turn OFF the ignition. Disconnect the MAP sensor electrical connector. Turn ON the ignition, with the engine OFF. Does the scan tool indicate that the MAP sensor voltage is more than 0.1 V? If yes, go to step  16. If on, go to next step.
  10. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the MAP sensor and the signal circuit of the MAP sensor. Does the scan tool indicate that the MAP sensor voltage is near 5 V? If yes, go to next step. If no, go to step  15.
  11. Remove the jumper wire. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground. Does the voltage measure more than 5.2 V? If yes, go to step  13. If no, go to next step.
  12. Probe the low reference circuit with a test lamp connected to a battery positive voltage source. Does the test lamp illuminate? If yes, go to step  17. If no, go to step  14.
  13. Test the 5-volt reference circuit of the MAP sensor for a short to voltage. Did you find and correct the condition? If yes, go to step  21. If no, go to step  18.
  14. Test the low reference circuit of the MAP sensor for high resistance or an open. Did you find and correct the condition? If yes, go to step  21. If no, go to step  18.
  15. Test the 5-volt reference and the signal circuit of the MAP sensor for high resistance. Did you find and correct the condition? If yes, go to step  21. If no, go to step  18.
  16. Test the signal circuit of the MAP sensor for a short to voltage. Did you find and correct the condition? If yes, go to step  21. If no, go to step  18.
  17. Inspect the MAP sensor for poor connections. Did you find and correct the condition? If yes, go to step  21. If no, go to step  19.
  18. Inspect the PCM for poor connections. Did you find and correct the condition? If yes, go to step  21. If no, go to step  20.
  19. Replace the MAP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  21.
  20. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  21. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  3.
  22. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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.

Shop Manual-Ready ToolsFree Quote CheckQuote 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.