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 MANUALSCHEVROLET2011MALIBU LTZ, 2.4 1REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 407 (ENGINE CONTROLS & FUEL - 3.5L - DTC P0340 TO DTC P2544)DTC P0340 OR P0341CIRCUIT/SYSTEM TESTING
2011 Chevrolet Malibu LTZ, 2.4 1
Circuit/System Testing
2011 Chevrolet Malibu LTZ, 2.4 1SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
P0340
- Ignition OFF, disconnect the 16-way engine harness to fuel injector harness connector.
- Test for less than 1 ohm of resistance between ECM side of the low reference circuit and ground.
- If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the ECM side of the 5-volt reference circuit and ground.
- If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the ECM side of the signal circuit and ground.
- If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition ON, using a jumper wire connected to ground, momentarily touch the CMP sensor signal circuit repeatedly. The CMP active counter parameter should increment.
- If the CMP active counter does not increment, replace the ECM.
- Ignition OFF, inspect the wiring harness, from the 16-way connector to the CMP sensor, for any damage, opens, or shorts.
- If the circuits test normal replace the CMP sensor.
P0341
- Ignition OFF, inspect the CMP sensor for looseness and correct installation.
- If the sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary
- Inspect the engine for the following conditions:
- Engine oil for debris
- Camshaft reluctor wheel for damage
- The timing chain, tensioner, and sprockets for wear or damage
- If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components. Refer to Timing Chain and Sprockets Cleaning and Inspection and Camshaft and Bearings Cleaning and Inspection .
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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.