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Refer to Engine Controls Schematics MAF, Secondary Air Injection Pump Bypass Solenoid, IAC and Secondary AIR Pump . Circuit Description The AIR pump is used on this vehicle to lower tail pipe emissions on start-up. The powertrain control module (PCM) grounds the AIR pump relay control circuit, which energizes the AIR pump. The PCM also grounds the AIR solenoid valve control circuit, which energizes the AIR solenoid valve. The AIR solenoid valve opens allowing manifold vacuum to open the AIR control valves. The PCM enables both control circuits when AIR system operation is desired. When the AIR system is active, the AIR pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR control valves replace the conventional check valves. When the AIR system is inactive, the AIR control valves prevent air flow in either direction. DTC P0412 applies to the AIR solenoid control circuit. DTC P0418 applies to the AIR pump relay control circuit. DTC P0410 sets if an air flow problem is detected. The PCM will run two tests using the heated oxygen sensor (HO2S) voltage to diagnose the AIR system. Both tests have two parts. The passive test is performed during regular AIR pump operation. The passive test consists of the following: Passive Test Part 1 When the AIR system is enabled, the PCM monitors the HO2S voltage. If the HO2S voltage goes below a threshold, the PCM interprets this as an indication that the AIR system is operational. Passive Test Part 2 When the AIR system is disabled, the PCM monitors the HO2S voltage. The HO2S voltage should increase above a threshold and switch normally. If both of these tests indicate a pass, no further action is taken. If one of the above tests failed or is inconclusive, the diagnostic will proceed to test two. The active test is performed specifically for diagnostic purposes. Test two consists of the following: Active Test Part 1 During this test the PCM turns the AIR system on during closed loop operation. When the AIR system is activated, the PCM monitors the HO2S voltage. If the AIR system is operating properly, the HO2S voltage should go below a predetermined threshold. Active Test Part 2 The PCM turns the AIR system off. The HO2S voltage should return to above a rich threshold.

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Models: 2004-2005 Buick Rainier 2002-2005 Chevrolet TrailBlazer Models 2002-2005 GMC Envoy Models 2002-2004 Oldsmobile Bravada 2005 Saab 9-7X Condition Some customers may comment on slow to cool Air Conditioning (A/C) performance or high A/C outlet temperatures after start up or that the A/C system is not cooling sufficiently, especially in high ambient temperatures. This may be an intermittent condition and the performance of the Heating, Ventilation and Air Conditioning (HVAC) system may not meet customer expectations. Cause This condition may be caused by the response of the Electro-Viscous (EV) fan clutch and can be related to airflow across the condenser. This low A/C system performance can occur for longer periods of time if the vehicle is allowed to idle or is driven in low speed conditions. The response of the EV fan clutch will affect A/C system performance. As higher road speeds are attained, the increased airflow across the condenser will usually improve A/C system performance and the response of the EV fan clutch. This condition may be more evident after the vehicle has set for a period of time and can be difficult to duplicate. The condition may occur after the vehicle has set for as little as 10 minutes or as long as overnight. It is most prevalent intermittently during the first 15 minutes of operation.

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The fluid level screw is intended to be used for diagnosing a transaxle fluid leak or resetting the transaxle fluid level after service that involves a loss of fluid. Inspect The fluid level should be checked when the transaxle is near Room temperature or at 40° (104° . C F) CAUTION: Removal of the fluid level screw when the transaxle fluid is hot may cause injury. Use care to avoid contact of transaxle fluid to exhaust pipe. The engine must be running when the transaxle fluid level screw is removed, or excessive fluid loss will occur. Since the actual fluid level is unknown, stand clear when removing the fluid level screw. Have a container ready to capture any lost fluid. WARNING: Do not turn the engine off with the fluid level screw removed as you can be injured by hot transaxle fluid being expelled out of the fluid check hole. 1. Let vehicle idle for three to five minutes with accessories off. 2. Apply brake 3. Move shift lever through all gear ranges, pausing three seconds in each range. 4. Place shift lever in Park. Important: Vehicle must be kept level on the hoist. 5. Raise vehicle on hoist. 6. Place oil container under fluid level screw. 7. Remove the fluid level screw with the engine running at idle. 8. Fluid level should be at the bottom of the fluid check hole. Because the transaxle operates correctly over a range of fluid levels, fluid may or may not drain out of the fluid check hole when the fluid level screw is removed. If fluid drains through the fluid check hole, this transaxle may have been overfilled. When fluid stops draining, the fluid level is correct and the fluid level screw may be installed. If fluid does not drain through the fluid check hole, the transaxle fluid level may be low. Proceed to ADDING TRANSAXLE FLUID. 9. Install fluid level screw. Tighten 12 N.m (106 lb in) 10. Lower vehicle. 11. Shut off engine. Adding Transaxle Fluid: With the engine running, add fluid at the vent cap location in half liter (1 pint) increments until fluid drains through the fluid check hole. Allow the fluid to finish draining through the fluid check hole. 1. Install fluid level screw. Tighten 12 N.m (106 lb in) 2. Lower vehicle.

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Remove or Disconnect: 1. Disconnect negative battery cable 2. Remove serpentine belts from crankshaft pulley 3. Properly raise and support vehicle 4. Remove right front tire and wheel assembly 5. Remove right inner fender access cover 6. Using 28 mm socket, remove crankshaft harmonic balancer retaining bolt 7. Using special tool J38197, remove crankshaft harmonic balancer 8. Remove crankshaft position sensor shield 9. Disconnect sensor electrical connector 10. Remove sensor from block face Install or Connect: 1. Install crankshaft position sensor to block face 2. Tighten bolts Torque Value: 20-40 N-m (14-28 lb.ft.) 3. Install crankshaft position sensor shield 4. Connect electrical connector 5. Install balancer on crankshaft 6. Apply thread sealer GM #1052080 or equivalent to threads of crankshaft balancer bolt Torque Value: 150 N-m + 76° (110 lb.ft. + 76°) 7. Install inner fender shield 8. Install tire and wheel assembly Torque Value: 140 N-m (104 lb.ft.) 9. Lower vehicle 10. Install serpentine belt 11. Connect negative battery cable

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The purpose of this test is to satisfy the enable criteria necessary to execute I/M readiness diagnostics for the evaporative emission (EVAP) system. The test may be used to set the I/M System Status indicators to YES. Service Bay Tests are included on the scan tool for some systems depending upon vehicle make and model. The test is designed to allow the EVAP Diagnostic Tests to run in service bay conditions. Ensure that the vehicle meets the requirements listed in Conditions for Running before performing either EVAP System Test. Failure to meet the necessary requirements may produce inaccurate test results. CONDITIONS FOR RUNNING Non Scan Tool Service Bay Test equipped vehicles ^ The barometric pressure (BARO) is more than 75 kPa. ^ The fuel level is between 15-18 percent. ^ The battery voltage is between 10-18 volts. ^ The test will initiate only after a cold start. The control module considers the engine to be cold if the following conditions are met: – The engine coolant temperature (ECT) is between 4-30°C (39-86°F). – The intake air temperature (IAT) is between 4-30°C (39-86°F). – The difference between the ECT and the IAT is less than 8°C (14°F). Scan Tool Service Bay Test equipped vehicles ^ The BARO is more than 75 kPa. ^ The ECT is less than 70°C (158°F). ^ The fuel level is between 15-18 percent. ^ The battery voltage is between 9-18 volts.