Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
- Turn ignition on, engine off. Using scan tool, monitor APP SENSOR 2. If reading is less than 0.13 volt, go to next step. If reading is not less than 0.13 volt, go to step 6 .
- Disconnect APP sensor. If reading is more than 4.87 volts, go to step 4 . If reading is not more than 4.87 volts, go to next step.
- Turn ignition off. Disconnect ECM connector J1. Check continuity between APP sensor connector terminal "H" (Light Blue wire) and ground. Check continuity between APP sensor connector terminals "H" (Light Blue wire) and "J" (Tan wire). If continuity exists in either test, repair short in Light Blue wire to ground or Tan wire. If continuity does not exist in either test, replace ECM.
- Using DVOM, measure voltage at APP sensor connector terminal "G" (Purple wire). If 4-6 volts are present, check APP sensor connector. If connector is okay, replace APP sensor. If 4-6 volts are not present, go to next step.
- Using scan tool, monitor TP SENSOR 1, FTP SENSOR and A/C PRESSURE SENSOR. If all 3 readings are less than 0.13 volt, 5-volt reference 1 may be shorted to ground. See DTC P1635: 5-VOLT REFERENCE 1 CIRCUIT . If all 3 readings are not less than 0.13 volt, repair open in Purple wire between ECM and APP sensor.
- If voltage reading is more than 4.87 volts, go to next step. If voltage is 0.13-4.87 volts, problem is intermittent. See DIAGNOSTIC AIDS .
- Disconnect APP sensor. Using test light, connect between APP sensor connector terminals "H" (Light Blue wire) and "J" (Tan wire). If reading is less than 0.13 volt, go to step 9 . If reading is not less than 0.13 volt, go to next step.
- Remove test light. Using DVOM, measure voltage between APP connector terminals "G" (Purple wire) and "J" (Tan wire). If 4-6 volts are present, check Light Blue wire between ECM and APP sensor for open. If wire is okay, replace ECM. If 4-6 volts are not present, check Tan wire between ECM and APP sensor for open. If wire is okay, replace ECM.
- Remove test light. Using DVOM, measure voltage at APP sensor connector terminal "H" (Light Blue). If 4-6 volts are present, go to next step. If 4-6 volts are not present, repair short to voltage in Light Blue wire between ECM and APP sensor.
- Using DVOM, measure voltage at APP sensor connector terminal "G" (Purple wire). If voltage is more than 6 volts, 5-volt reference 1 may be shorted to voltage. See DTC P1635: 5-VOLT REFERENCE 1 CIRCUIT . If voltage is not more than 6 volts, go to next step.
- Turn ignition off. Disconnect ECM connector J1. Check continuity between APP sensor connector terminals "G" (Purple wire) and "H" (Light Blue wire). If continuity exists, repair short between Purple wire and Light Blue wire. If continuity does not exist, check APP sensor connector. If connector is okay, replace APP sensor.
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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.