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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 119 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P1220: THROTTLE POSITION SENSOR 2 CIRCUITDIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada AWD

Diagnostic Procedures

2004 Oldsmobile Bravada AWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTC P1639 is also set, diagnose that DTC first. See DTC P1639: 5-VOLT REFERENCE 2 CIRCUIT  .
  1. Turn ignition on, engine off. Using scan tool, monitor TP sensor 2. If reading is less than 0.2 volt, go to next step. If reading is not less than 0.2 volt, go to step  6 .
  2. Disconnect throttle body connector. If reading is more than 4.88 volts, go to next step. If reading is not more than 4.88 volts, go to step  5 .
  3. Using DVOM, measure voltage at throttle body connector terminal "H" (Light Blue/Black wire). If 4-6 volts is present, check throttle body connector. If connector is okay, replace throttle body connector. If 4-6 volts is not present, go to next step.
  4. Using scan tool, monitor MAP SENSOR and APP SENSOR 1. If both readings are less than 0.2 volts, check for possible short to ground in 5-volt reference 2 circuit. See DTC P1639: 5-VOLT REFERENCE 2 CIRCUIT  . If both readings are not less than 0.2 volt, check Light Blue/Black wire for open between throttle body and ECM. If wire is okay, replace throttle body.
  5. Turn ignition off. Disconnect ECM connector J2. Check continuity between throttle body connector terminal "D" (Purple wire) and ground. Check continuity between throttle body connector terminals "B" (Black/White wire) and "D" (Purple wire). If continuity exists in either test, repair short to ground or short to Black/White wire in Purple wire between ECM and throttle body. If continuity does not exist in either test, replace ECM.
  6. If reading is more than 4.67 volts, go to next step. If reading is not more than 4.67 volts, problem is intermittent. See DIAGNOSTIC AIDS  .
  7. Disconnect throttle body connector. Using a test light, jumper throttle body connector terminals "B" (Black/White wire) and "D" (Purple wire). If reading is less than 0.2 volt, go to step  9 . If reading is not less than 0.2 volt, go to next step.
  8. Remove jumper. Using DVOM, measure voltage between throttle body connector terminals "B" (Black/White wire) and "H" Light Blue/Black wire. If 4-6 volts are present, check Purple wire between ECM and throttle body for open. If wire is okay, replace ECM. If 4-6 volts are not present, check Black/White wire between ECM and throttle body for open. If wire is okay, replace ECM.
  9. Remove jumper. Using DVOM, measure voltage at throttle body connector terminal "D" (Purple wire). If 4-6 volts are present, go to next step. If 4-6 volts, are not present, repair short to voltage in Purple wire between ECM and throttle body.
  10. Using DVOM, measure voltage at throttle body connector terminal "H" (Light Blue/Black wire). If voltage is more than 6 volts, check 5-volt reference for short to voltage. See DTC P1639: 5-VOLT REFERENCE 2 CIRCUIT  . If voltage is not more than 6 volts, go to next step.
  11. Turn ignition off. Disconnect ECM connector J2. Check continuity between throttle body connector terminals "D" (Purple wire) and "H" (Light Blue/Black wire). If continuity exists, repair short between Purple wire and Light Blue/Black wire. If continuity does not exist, check throttle body connector. If connector is okay, replace throttle body.
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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.