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 184 (MULTIPLEX INTEGRATED CONTROL SYSTEM)MICU INPUT TEST
2008 Chevrolet HHR LT, 2.4 P, Automatic
MICU Input Test
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION MICU Input Test
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:
- Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Before testing, check the No. 1 (15 A), No. 10 (7.5 A), No. 14 (7.5 A), No. 20 (15 A) and No. 22 (7.5 A) fuses in the under-dash fuse/relay box.
- Turn the ignition switch to LOCK (0).
- Remove the fuse access panel (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
- Disconnect under-dash fuse/relay box connectors A, B, K, M, N, and Q.NOTE: All connector views are shown from wire side of female terminals.
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.