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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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2006 Toyota Corolla L4-1.8L (1ZZ-FE) Vehicle Level Heating and Air Conditioning Service and Repair Air Conditioning Unit Assy
Air Conditioning Unit Assy Notes Air Conditioner Unit Assy Part 1 Air Conditioner Unit Assy Part 2 OVERHAUL
HINT: Installation is in the reverse order of removal.
1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM SST 07110-
58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-
88070, 07117-88080)
2. DISCONNECT SUCTION HOSE SUB-ASSEMBLY

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1. Check the A/C clutch air gap at three equally spaced places between the clutch plate and the A/C clutch pulley. 2. If the A/C clutch air gap is out of range, remove the clutch plate. Add or remove spacers between the clutch plate hub and the compressor shaft until the clearance is within specification. Heating and Air Conditioning Compressor HVAC Compressor Clutch Adjustments AIR CONDITIONING (A/C) CLUTCH AIR GAP ADJUSTMENT

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Heater blower speed resistor Inertia fuel shut off switch Inertia fuel shut off switch – Diesel Interior lamp delay relay Outside air temperature sensor Seat adjustment relay, driver’s side Seat adjustment relay, passenger’s side Steering position sensor Sunroof motor Suspension adjustment valve block, rear Suspension control module Suspension G-force sensor Suspension ride height sensor, front Suspension ride height sensor, rear Vehicle speed sensor Air conditioning air temperature control module (-1994MY) Air conditioning condenser blower motor control module Air conditioning control module Air conditioning control module (1995MY-) Air conditioning refrigerant pressure switch Airbag control module (in steering wheel) Alarm system control module Central locking control module Central locking signal control module Coded keypad Compact disc interface Cruise control actuator valve Cruise control module Cruise control vacuum pump Diagnostic link Door mirror adjustment control module Electric windows control module, right front Engine control module relay 1 Engine control module relay 2 Engine coolant blower motor relay 1

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Relay location on the thirteen position auxiliary relay panel, above relay panel: 1 – Auxiliary Emergency Flasher Relay (404) 2 – Relay for Motor Remote Unlock Rear Lid (79) 3 – Starting Interlock Relay (53) (185) (465) 4 – Fog Light Relay (53) 5 – Control Module for Multi-function Steering Wheel (450) 6 – Control Module for Multi-function Steering Wheel (450) 7 – Daytime Running Lights Change-over Relay (173), from April 1999 8 – Daytime Running Lights Change-over Relay (173), through March 1999 9 – Dual Horn Auxiliary Relay (53) 10 – Glow Plug Relay (180) 10 – Warning Lamp Auxiliary Relay (200) 11 – Park/Neutral Position (PNP) Relay (175) 12 – Power Supply (Terminal 30, B+) Relay (109) Relay Panel: 1 – Dual Horn Relay (53) 2 – Load Reduction Relay (18) (100) 4 – Fuel Pump (FP) Relay (409) V – Wiper/Washer Intermittent Relay (192) (377) (389) VI – Wiper/Washer Intermittent Relay (192) (377) (389) NOTE Number in parentheses ( ) indicates production control number stamped on relay housing.