SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 38 (ENGINE CONTROLS - TESTS W/CODES - 4.3L)DIAGNOSTIC TROUBLE CODESDTC P0106 - MAP SENSOR SYSTEM PERFORMANCECIRCUIT DESCRIPTION
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Circuit Description

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Circuit Description
WARNING: This page is about a different car, the 1998 GMC Pickup and 1998 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). A 5-volt reference is applied to sensor. A variable resistor moves in relation to manifold pressure and a voltage signal is returned to VCM through MAP signal circuit. Voltage signal varies from 1.0-1.5 volts at closed throttle (high vacuum) to 4.0-4.5 volts at wide open throttle (low vacuum). A change in throttle position and engine speed should precede change in MAP. If change does not occur, MAP malfunction is present. VCM utilizes MAP signal and throttle position to determine fuel delivery.

Conditions for setting DTC:

  • Engine is running.
  • No IAC or TP sensor DTCs set.
  • No EGR DTCs are set.
  • Change in engine speed is less than 75 RPM.
  • Change in throttle position is less than 1.5 percent.
  • Change in EGR flow is less than 2 percent.
  • Change in IAC is less than 4 counts.
  • No change in brake switch status.
  • No change in clutch status (M/T).
  • No change in power steering switch status.
  • No change in A/C clutch status.
  • Conditions have stabilized for 2 seconds.
  • Engine speed between 400-5000 RPM.
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.