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Home >> Toyota >> 1994 >> Camry XLE, 2.2 S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> A/C Idle-Up System >> 3.0L
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A/C Idle-Up System: 3.0L

  1. Before testing A/C idle-up system, ensure hoses at A/C idle-up valve are not damaged or clogged. A/C idle-up valve is located on end of air intake manifold on driver's side. See Fig 1.
  2. Ensure idle speed is correct with engine at normal operating temperature. See IDLE SPEED & MIXTURE in appropriate ADJUSTMENTS - V6 article. Apply parking brake. Place transaxle in Neutral.
  3. With engine idling, turn A/C on. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1. See Figure.
  4. Engine idle speed should increase to approximately 1000 RPM for approximately 3 seconds and then drop to just slightly above normal idle speed and remain at this speed. If idle speed does not increase, proceed to step 6) If idle speed is correct, proceed to next step.
  5. After approximately 15 seconds, ensure idle speed does not increase more than 100 RPM than idle speed obtained in step 4). If idle speed increases more than 100 RPM, rotate adjusting screw on A/C idle-up valve so idle speed does not exceed idle speed obtained in step 4). See Fig 1. Remove jumper wire. Turn A/C off and remove tachometer.
  6. If idle speed does not increase as specified, check A/C idle-up valve. See A/C IDLE-UP VALVE  under IDLE CONTROL SYSTEM. If A/C idle-up valve operates correctly, proceed to step 7).
  7. Remove glove compartment for access to Engine Control Module (ECM). Start engine. Using voltmeter, check voltage between Terminal No. 1 (White/Blue) wire of E9 connector and chassis ground. See Figure, Figure and Figure.
  8. Voltage should be 9-14 volts with engine idling and A/C off. If voltage is not within specification, check for defective EFI main relay or wiring harness between EFI main relay and ECM. See EFI MAIN RELAY  under RELAYS. See appropriate wiring diagram inWIRING DIAGRAMS article.
  9. If EFI main relay and wiring harness are okay, check ECM ground circuit. If ECM ground circuit is okay, substitute another ECM and recheck system operation.
Fig 1: Idle Speed Adjusting Screw On A/C Idle-Up Valve ID (3.0L)
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