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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 160 (IMA SYSTEM)AUTO IDLE STOP SYSTEM INSPECTION
2008 Chevrolet HHR LT, 2.4 P, Automatic

Auto Idle Stop System Inspection

2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Auto Idle Stop System Inspection
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check under these conditions:
    • At 2.500 m (8,200 ft) or less altitude (At higher altitudes, auto idle stop is often prevented because of the lack of vacuum in the brake booster).
    • The low temperature indicator is off.
    • The IMA battery level indicator displays at least half full.
    • Climate control off.
    • All electrical items (headlights, blower fan, radiator fan, rear window defogger, A/C, etc.) are off.
    • The transmission is in D.
    • The D indicator is not flashing.
    • No heavy load in the vehicle (A heavy load prevents auto idle stop because the system "thinks" the vehicle is going uphill).
    • Drive the vehicle on a flat road or downhill.
  2. Start the engine.
  3. Test-drive under these conditions:
    • Drive the vehicle at 25 mph (40 km/h), then stop it within 5-15 seconds.
    • Press and hold the brake pedal until the vehicle stops (Do not pump the brake pedal).
    • Keep the brake pedal pressed after the vehicle stops.
  4. Repeat step  3 several times.

    Is auto idle stop working? 

    YES  -The system is OK at this time. If needed, refer to auto idle stop conditions (see AUTO IDLE STOP CONDITIONS  ).

    NO  -Go to the auto idle stop system troubleshooting (see AUTO IDLE STOP SYSTEM TROUBLESHOOTING  ).

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.