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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1691 (ENGINE CONTROLS AND FUEL - 4.3L - DTC P0340 TO DTC P2138)DTC P1682CIRCUIT/SYSTEM TESTINGTESTING THE EC IGNITION RELAY FEEDBACK CIRCUIT
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Testing the EC Ignition Relay Feedback Circuit
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Testing the EC Ignition Relay Feedback Circuit
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, remove the powertrain relay from the underhood fuse block.
- Ignition ON, connect a 3A fused jumper wire from B+ to the powertrain ignition 1 voltage circuit terminal. Verify that the EC Ignition Relay Feedback parameter displays B+ on the scan tool.
- If the scan tool parameter is less than the specified value, test the ignition 1 voltage circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
IMPORTANT:
A resistance of 5 ohms or greater in the circuit will cause the DTC to set.
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.