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HOMESERVICE MANUALSCADILLAC2007XLR VREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS AND FUEL - 4.4L - DTC P0010 TO DTC P0154DTC P0068 OR P0121CIRCUIT/SYSTEM TESTING
2007 Cadillac XLR V

Circuit/System Testing

2007 Cadillac XLR VSECTION Circuit/System Testing
IMPORTANT: You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
  1. Start the engine. The Manifold Absolute Pressure (MAP) and SC Inlet Pressure Sensor parameters should decrease and closely match each other.
    • If the MAP sensor parameter does not decrease, refer to DTC P0106 .
    • If the SC Inlet Pressure Sensor parameter does not decrease, refer to DTC P012B .
  2. Engine running, inspect for any of the following conditions:
    • Vacuum hoses for splits, leaks and improper connections
    • Air leaks at throttle body mounting area and intake manifold sealing surfaces
    • A supercharger bypass valve that is binding or incorrectly adjusted-Refer to Supercharger Cleaning and Inspection
    • If any of the above conditions are found, repair as necessary.
  3. While taking a snapshot of the engine data list, perform the following actions. Idle the engine. Increase the engine speed slowly to 3,000 RPM, then return to an idle. Observe the Mass Air flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor parameter should change smoothly as the engine speed is increased and is returned to idle.
    • If the MAF sensor parameter does not change smoothly as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101 .
  4. Ignition ON, slowly depress the accelerator pedal to a WOT position, then slowly release the pedal while comparing the TP Sensor 1 and TP Sensor 2 parameters. The difference between the parameters should be less than 4 percent.
    5. CAUTION: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
  5. Ignition OFF, inspect the throttle body for the following conditions:
    • Loose or damaged throttle blade
    • Broken throttle shaft
    • Any throttle body damage
    • If any of these conditions exist, replace the throttle body assembly.
RENDER: 1.0x

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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.