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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 2 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.3L)DIAGNOSTIC TESTSDTC P0106: MAP SYSTEM PERFORMANCEDIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F

Diagnostic Procedures

2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, observe throttle angle parameter. Move throttle slowly from closed to wide open position. If throttle angle move steadily and completely from 0-98 percent, go to next step. If throttle angle does not move steadily and completely from 0-98 percent, see DTC P0121: TP SENSOR PERFORMANCE .
    3. NOTE: Perform either of the following to determine correct MAP sensor value of barometric pressure for any evaluation.
  3. Compare MAP sensor value to barometric pressure value in a known-good vehicle. Or, obtain local weather service barometer reading (in. Hg). Multiply reading by 3.4. Result indicates correct barometric pressure value in kPa for your area. If MAP value is normal for altitude, go to next step. If MAP value is not normal for altitude, go to step  8.
  4. Observe MAP sensor kPa display on scan tool. Start engine. If MAP sensor value changes, go to next step. If MAP sensor value does not change, go to step  8.
  5. Turn ignition off. Remove MAP sensor from vacuum source. See COMPONENT LOCATIONS . Leave electrical harness connected. Connect a hand vacuum pump to MAP sensor. Turn ignition on, engine off. Observe MAP sensor kPa as you slowly apply vacuum one in. Hg at a time. Each in. Hg of vacuum should result in a 3-4 kPa drop in MAP sensor display. Observe MAP sensor kPa display for a skip or jump while increasing vacuum up to 20 in. Hg. If scan tool indicates a skip or a jump in MAP sensor kPa, go to step  16. If scan tool does not indicate a skip or a jump in MAP sensor kPa, go to next step.
  6. Observe MAP sensor kPa display with 20 in. Hg of vacuum applied to MAP sensor. If scan tool indicates MAP sensor kPa is less than 34 kPa, go to next step. If scan tool does not indicate MAP sensor kPa is less than 34 kPa, go to step  8.
  7. Disconnect MAP sensor from hand vacuum pump. MAP sensor kPa should return to value observed in step  2. If MAP sensor kPa returns to original value, see DIAGNOSTIC AIDS . If MAP sensor does not return to original value, go to step  16.
  8. Turn ignition off. Disconnect MAP sensor connector. Turn ignition on, engine off. If scan tool indicates MAP sensor voltage is more than 0.1 volt, go to step  15. If scan tool does not indicate MAP sensor voltage is more than 0.1 volt, go to next step.
  9. Connect a fused jumper wire (3-amp) between MAP sensor connector terminals "B" (Light Green wire) and "C" (Gray wire). See Figure or Figure . If scan tool indicates MAP sensor voltage is about 5 volts, go to next step. If scan tool does not indicate MAP sensor voltage is about 5 volts, go to step  14.
  10. Remove jumper wire. Measure voltage between MAP sensor connector terminal "B" (Light Green wire) and ground. If voltage is more than 5.2 volts, go to step  12. If voltage is not more than 5.2 volts, go to next step.
  11. Using test light connected to battery voltage, probe MAP sensor connector terminal "A" (Orange/Black wire). If test light is on, go to step  16. If test light is off, go to step  13.
  12. Check Gray wire between MAP sensor and PCM for short to voltage. If problem was found, repair as necessary. After repairs, go to step  20. If problem was not found, go to step  17.
  13. Check Orange/Black wire between MAP sensor and PCM for high resistance or open. If problem was found, repair as necessary. After repairs, go to step  20. If problem was not found, go to step  17.
  14. Check Gray wire between MAP sensor and PCM for high resistance. If problem was found, repair as necessary. After repairs, go to step  20. If problem was not found, go to step  17.
  15. Check Light Green wire between MAP sensor and PCM for short to voltage. If problem was found, repair as necessary. After repairs, go to step  20. If problem was not found, go to step  17.
  16. Check MAP sensor connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  20. If problem was not found, go to step  18.
  17. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  20. If problem was not found, go to step  19.
  18. Replace MAP sensor. After repairs, go to step  20.
  19. Replace PCM. Program PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  20. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  21. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
RENDER: 1.0x

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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.