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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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1. Relieve the fuel pressure. Refer to Section 10-01 for the procedure. 2. Disconnect the battery ground cable (14301). 3. Drain the cooling system. Refer to Section 03-03 for the procedure. 4. Remove the engine air cleaner intake tube (9A624) and engine intake air resonator (9F763). Refer to Section 03-12 for the removal procedure. 5. Disconnect the two throttle position (TP) sensor electrical connectors. 6. Slide the TP sensor electrical wiring out of the bracket. 7. Remove the coolant hose from the throttle body (9E926). 8. Disconnect the exhaust gas recirculation (EGR) vacuum regulator solenoid electrical connector. 9. Remove the evaporative emission (EVAP) canister vacuum hose. 10. Disconnect the EVAP canister-to-throttle body hose from the throttle body. 11. Remove the fuel pressure regulator-to-upper intake manifold vacuum hose from the upper intake manifold (9424). 12. Disconnect the No. 1, 3, and 5 cylinder distributor to spark plug wires (12286) from the spark plugs (12405), then remove the spark plug wire boots from in between the upper intake manifold runners. 13. Remove the two spark plug wire bracket bolts and spark plug wire brackets from the upper intake manifold. 14. Remove the distributor dust cover. 15. NOTE: The distributor cap screws are not removable from the distributor cap (12106). Loosen the three distributor cap screws. 16. Remove the distributor cap from the distributor (12127). Position the distributor cap and distributor to spark plug wires aside to gain access to the main engine wiring harness. 17. Disconnect the rear heater valve vacuum hose from the right side of the upper intake manifold, if equipped.

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NOTE: The 3.0L throttle body (9E926) and upper intake manifold are combined in one piece. 1. Perform Pre-Service procedures as described in this section. 2. Disconnect electrical connectors to the intake air temperature sensor (IAT sensor) (12A697) and mass air flow sensor (MAF sensor) (12B579). 3. Disconnect air crankcase ventilation hose (6853) from nipple on valve cover (6582). 4. Loosen clamps and remove air cleaner outlet tube (9B659). 5. Using trim removing tool, remove pushpins and accelerator control splash shield (9E766). 6. Disconnect accelerator cable (9A758) from throttle body. Remove three screws and accelerator cable bracket (9723) and position assembled accelerator cable and accelerator cable bracket out of the way. 7. Tag and disconnect connectors of emission control vacuum harness and remove. 4 9J459 5 9A474 8. Disconnect PCV hose from throttle body. PCV Hose EGR Vacuum Regulator Solenoid Intake Manifold Vacuum Outlet Fitting and Cap 9. Disconnect spark plug wires from ignition coil (12029) and position out of the way. 10. Disconnect electrical connections from ignition coil, EGR vacuum regulator solenoid (9J459), EGR transducer (9J433), idle air control valve (IAC valve) (9F715), and throttle position sensor (TP sensor) (9B989). 11. Remove two nuts and ignition coil mounting bracket (12N004). 12. Remove two nuts and ignition coil with assembled bracket, EGR vacuum regulator solenoid and radio ignition interference capacitor (18801).

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1. Remove the hood. 2. On A/C equipped vehicles, recover the air conditioning system; refer to Section 412-00 . 3. Drain the cooling system; refer to Section 303-03 . 4. Relieve the fuel pressure; refer to Section 310-00 . 5. Disconnect the battery ground cable. 6. Remove the upper front air deflector (19E525). 1. Remove the ten screws. 2. Remove the upper front air deflector. 7. Remove the engine air cleaner outlet tube; refer to Section 303-12 . 8. Remove the radiator, fan blade assembly, and fan shroud; refer to Section 303-03 . 9. Remove the accelerator control splash shield. 1. Remove the two bolts. 2. Remove the accelerator control splash shield. 10. Disconnect the (A) accelerator cable end and, if equipped, the (B) speed control actuator cable end. 11. Remove the (A) accelerator cable to bracket bolt and, if equipped, the (B) speed control actuator cable to bracket bolt and position the (C) accelerator cable and, if equipped, the (D) speed control actuator cable aside. 12. Disconnect the vapor management valve (VMV) hose. 13. Disconnect the manifold vacuum connection. 14. Disconnect the (A) intake manifold runner control (IMRC) vacuum connectors, the (B) fuel pressure regulator vacuum connector, the (C) IMRC solenoid vacuum connector, the (D) engine vacuum regulator (EVR) vacuum connector, and the (E) vacuum reservoir connector. 15. Disconnect the exhaust gas recirculation (EGR) valve vacuum connector. 16. Position the power steering reservoir aside. 1. Remove the three bolts. 2. Position the power steering reservoir aside. 17. On A/C equipped vehicles, position the A/C lines aside. 1. Remove the A/C compressor manifold bolt. 2. Disconnect and position the A/C lines aside.

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All vehicles 1. Drain the cooling system. For additional information, refer to DRAINING . 2. Disconnect the battery ground cable. For additional information, refer to REMOVAL AND INSTALLATION . 3. Remove the air cleaner outlet pipe. For additional information, refer to REMOVAL AND INSTALLATION . 4. Remove the 4 transaxle roll restrictor cross brace bolts.5. Remove the bolt and the transaxle roll restrictor cross brace. 6. Disconnect the evaporative emissions (EVAP) canister purge valve tube from the upper intake manifold and detach the retainer. 7. Disconnect the positive crankcase ventilation (PCV), brake booster and vacuum harness tubes from the upper intake manifold. 8. Detach the fuel tube retainer from the upper intake manifold. 9. Disconnect the exhaust gas recirculation (EGR) system module electrical connector and vacuum tube. 10. Detach the vacuum tube from the upper intake manifold vacuum tube retainer. 11. Disconnect the EGR system module tube from the EGR system module. Early build 12. Disconnect and plug the throttle body and PCV coolant hoses. Late build 13. Disconnect and plug the 2 PCV coolant hoses. All vehicles 14. Disconnect the throttle body electrical connector. 15. If equipped, remove and discard the 4 upper-to-lower intake manifold screws. 16. Remove the 8 bolts and the upper intake manifold. Remove and discard the gaskets. Installation All vehicles NOTE: Clean and inspect all sealing surfaces. Install new gaskets. 1. Position the upper intake manifold and install the 8 bolts. Tighten in the sequence shown to 10 N.m (89 lb-in). 2. Connect the throttle body electrical connector. Late build 3. Connect the 2 PCV coolant hoses. Early build 4. Connect the throttle body and PCV coolant hoses. All vehicle 5. Connect the EGR system module tube to the EGR system module. Tighten to 40 N.m (30 lb-ft). 6. Attach the vacuum tube to the upper intake manifold vacuum tube retainer. 7. Connect the EGR system module electrical connector and vacuum tube. 8. Attach the fuel tube retainer to the upper intake manifold. 9. Connect the PCV, brake booster and vacuum harness tubes to the upper intake manifold. 10. Connect the EVAP canister purge valve tube to the upper intake manifold and attach the retainer. 11. Clean the 4 transaxle roll restrictor cross brace bolts using a wire brush and apply new threadlock to the threads. 12. Position the transaxle roll restrictor cross brace and install the 4 new bolts. Tighten to 55 N.m (41 lb-ft). 13. Clean the transaxle roll restrictor cross brace-to-roll restrictor bolt using a wire brush and apply new threadlock to the threads. 14. Install a new transaxle roll restrictor cross brace-to-roll restrictor bolt. Tighten to 48 N.m (35 lb-ft). 15. Install the air cleaner outlet pipe. For additional information, refer to REMOVAL AND INSTALLATION . 16. Connect the battery ground cable. For additional information, refer to REMOVAL AND INSTALLATION . 17. Fill and bleed the cooling system.