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Home >> Chevrolet >> 1997 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Engine Controls - Tests W/Codes - 5.7L) >> Diagnostic Trouble Codes >> DTC P0106 - Map Sensor System Performance >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1997 GMC Yukon, 1997 GMC Suburban, 1997 GMC Pickup, 1997 GMC Cab & Chassis, and 1997 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING - 5.7L article. After performing OBD system check, go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Monitor MAP sensor voltage on scan tool. If voltage is 0.4 volt, go to next step. If voltage is not 0.4 volt, go to step 6).
  3. Disconnect and plug MAP sensor vacuum source. Connect a vacuum pump to MAP sensor. Start engine. Observe MAP sensor voltage on scan tool. Apply 10 in. Hg vacuum and observe MAP sensor voltage. Subtract this reading from voltage reading noted in step 2). If difference is greater than 1.5 volts, see DIAGNOSTIC AIDS. If difference is not greater than 1.5 volts, go to next step.
  4. Check MAP sensor connections. If problem is found, go to next step. If connections are okay, go to step 7).
  5. Repair connections as necessary. After repairs, go to step 7).
  6. Replace MAP sensor. After replacing sensor, go to next step.
  7. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0106. 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).
  8. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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