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HOMESERVICE MANUALSGMC1996SAVANA SPECIAL 6.5 YREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - G SERIES (6.5L DIESEL)DIAGNOSTIC TROUBLE CODESDTC P0236 - TURBOCHARGER BOOST SYSTEMDIAGNOSTIC PROCEDURES
1996 GMC Savana Special 6.5 Y

Diagnostic Procedures

1996 GMC Savana Special 6.5 YSECTION Diagnostic Procedures
  1. Perform Powertrain On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Install scan tool. Turn ignition, with engine off. Observe scan tool boost pressure and BARO parameters. If parameters are within 5 kPa of each other, go to next step. If not, go to step 7).
  3. Disconnect and plug boost sensor vacuum source. Connect a vacuum pump to boost sensor. Start engine. Using DVOM, probe boost signal circuit of PCM connector to ground. Observe boost pressure voltage. Apply 10" Hg vacuum and observe voltage. Subtract second reading from first reading. If voltage difference is greater than 1.5 volts, go to next step. If voltage difference is less than 1.5 volts, go to step 5).
  4. DTC is intermittent. If no additional DTCs are set, see DIAGNOSTIC AIDS. If any additional DTCs are set, go to applicable DTC test.
  5. Check for poor connections at boost sensor. If a problem was found, go to next step. If a problem was not found, go to step 7).
  6. Repair connections as necessary. Go to step 8).
  7. Replace boost sensor. Go to next step.
  8. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0236. 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).
  9. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.