Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 160 (IMA SYSTEM)SYSTEM DESCRIPTIONENGINE RESTART CONDITIONS
2008 Chevrolet HHR LT, 2.4 P, Automatic
Engine Restart Conditions
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Engine Restart Conditions
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.
NOTE:
The engine restarts when one or more of the conditions below are met.
ENGINE RESTART CONDITIONS CHART
| Engine Restart Conditions | Judgment Method/HDS Judgment Threshold Value | HDS Value | System Menu |
|---|---|---|---|
| PCM | During auto idle stop, the IMA battery state-of-charge drops below 37% | SOC | PGM-FI |
| With the shift lever in N, a start input from the starter switch is received. | STARTER SWITCH | PGM-FI | |
| Once the vehicle is stopped, any vehicle speed input higher than zero. | VEHICLE SPEED | PGM-FI | |
| Accelerator pedal is pressed. | APP SENSOR | PGM-FI | |
| Brake booster pressure increases or vacuum decreases or vacuum decreases into the disable range of auto idle stop. | BRAKE BOOSTER SENSOR (S) A + B | BRAKE/EVPS | |
| Engine coolant temperature and outside air temperature are within the disable range of auto idle stop. | ECT SENSOR 1 | PGM-FI | |
| IAT SENSOR | PGM-FI | ||
| Brake pedal position switch is open (brake pedal released) | BRAKE SWITCH | PGM-FI | |
| Idle stop switch is close (brake pedal released) | IDLE STOP SW | PGM-FI | |
| CVT PCM | A shift position of P, R, or L is detected | A/T P Switch | CVT |
| A/T R Switch | CVT | ||
| A/T L Switch | CVT | ||
| Climate Control Unit | Maximum auto idle stop time has elapsed | - | - |
| VSA PCM | Left-rear wheel speed output is 0.6 mph (1 km/h) or more | LEFT REAR WHEEL SPEED | ABS/VSA |
| Right rear wheel speed output of 0.6 mph (1 km/h) or more | RIGHT REAR WHEEL SEEED | ABS/VSA |
RENDER: 1.0x
NO RELATED
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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.