2011 Chevrolet Impala Service & Repair Manual

2010 ENGINE Engine Controls and Fuel - 3.5L - Impala REPAIR INSTRUCTIONS ENGINE CONTROL MODULE REPLACEMENT Service of the engine control module (ECM) should normally consist of either replacement of the ECM or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures call for ECM replacement, inspect the ECM first to see if the replacement is the correct part. If the ECM is faulty, remove the ECM and install the new service ECM. The new service ECM will not be programmed. You must program the new ECM. DTC P0602 indicates the EEPROM is not programmed or has malfunctioned. Removal Procedure CAUTION: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins or the soldered components on the circuit board. CAUTION: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components. NOTE: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change. 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Fig. 1: Identifying ECM Electrical Connectors Courtesy of GENERAL MOTORS CORP. 1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life, if required. 2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LGD) . 3. Remove the left front inner fender brace. Refer to Front Fender Upper Diagonal Brace Replacement . 4. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement . 5. Disconnect the ECM electrical connectors (2). 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Fig. 2: View Of ECM Courtesy of GENERAL MOTORS CORP. 6. Remove the ECM from the air cleaner lower housing. Installation Procedure 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Fig. 3: View Of ECM Courtesy of GENERAL MOTORS CORP. 1. Install the ECM to the air cleaner lower housing. 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Fig. 4: Identifying ECM Electrical Connectors Courtesy of GENERAL MOTORS CORP. 2. Connect the ECM electrical connectors (2). 3. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement . 4. Install the left front inner fender brace. Refer to Front Fender Upper Diagonal Brace Replacement . 5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LGD) . 6. Program the new ECM. Refer to Control Module References . CRANKSHAFT POSITION SYSTEM VARIATION LEARN IMPORTANT: The Crankshaft Position (CKP) system variation learn procedure is also 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

1. Install a scan tool. 2. Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set. 3. With a scan tool, select the CKP System Variation Learn Procedure and perform the following: 1. Block drive wheels. 2. Set parking brake. 3. DO NOT apply brake pedal. 4. Cycle ignition from OFF to ON. 5. Apply and hold brake pedal for the duration of the procedure. 6. Start and idle engine. 7. Turn the air conditioning (A/C) OFF. 8. The vehicle must remain in Park or Neutral. required when the following service procedures have been performed, regardless of whether DTC P0315 is set:  An engine replacement  A engine control module (ECM) replacement  A crankshaft balancer replacement  A crankshaft replacement  A CKP sensor replacement  Any engine repairs which disturb the crankshaft to CKP sensor relationship. IMPORTANT: The ECM monitors certain component signals to determine if all the conditions are met to continue with the CKP System Variation Learn Procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool displays the signals of the following components:  CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set.  Camshaft position (CMP) signal activity-If there is a CMP signal condition, refer to the applicable DTC that set.  Engine coolant temperature (ECT)-If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

9. Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs. 4. The scan tool displays Learn Status: Learned this Ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure. 5. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully in order to store the CKP system variation values in the ECM memory. THROTTLE/IDLE LEARN Description The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to throttle body coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned. An engine that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero. The idle may be unstable or a DTC may set if the learned values do not match the actual airflow. Conditions for Running the Throttle Learn Procedure Reset Procedure  DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.  Ignition ON, engine OFF.  The vehicle speed sensor (VSS) is 0 km/h (0 mph). Learn Procedure  DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.  The engine speed is between 450-4,000 RPM.  The manifold absolute pressure (MAP) is greater than 5 kPa.  The mass air flow (MAF) is greater than 2 g/s.  The ignition voltage is greater than 10 volts. 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Throttle Learn Reset Procedure (Performed after the throttle body is cleaned or replaced) 1. Ignition ON, engine OFF, perform the Idle Learn Reset in Module Setup with a scan tool. 2. Start the engine and monitor the TB Idle Airflow Compensation parameter. The TB Idle Airflow Compensation value should equal 0 percent and the engine should be idling at a normal idle speed. 3. Clear the DTCs and return to the diagnostic that referred you here. Learn Procedure (Performed after the ECM is flashed or replaced) 1. Start and idle the engine for 3 minutes. 2. With a scan tool, monitor the Desired Idle Speed and the actual Engine Speed. 3. The ECM will start to learn the new idle cells and Desired Idle Speed should start to decrease. 4. Ignition OFF for 60 seconds. 5. Start and idle the engine for 3 minutes. 6. After the 3 minute run time the engine should be idling normal.  If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles. 7. After the drive cycle, the engine should be idling normally.  If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6. 8. Once the engine speed has returned to normal, clear DTCs and return to the diagnostic that referred you here. ENGINE COOLANT TEMPERATURE SENSOR REPLACEMENT Removal Procedure NOTE: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle . NOTE: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn. CAUTION: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system. 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Fig. 5: View Of ECT Courtesy of GENERAL MOTORS CORP. 1. Drain the cooling system. Refer to Cooling System Draining and Filling (LZE, LZ4, LGD, 9C1, 9C3, GE47716 Fill) or Cooling System Draining and Filling (LZE, LZ4, LGD Static Fill) . 2. Remove the intake manifold cover, if necessary. Refer to Intake Manifold Cover Replacement . 3. Remove the exhaust crossover. Refer to Exhaust Crossover Pipe Replacement (LZE/LZ4/LGD) . 4. Disconnect the engine coolant temperature (ECT) sensor electrical connector. 5. Remove the ECT sensor. Installation Procedure CAUTION: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

Fig. 6: View Of ECT Courtesy of GENERAL MOTORS CORP. 1. Coat the threads of the ECT sensor with sealer GM P/N 13246004 (Canadian P/N 10953480) or equivalent. 2. Install the ECT sensor. Tighten: Tighten the ECT sensor to 20 N.m (15 lb ft). 3. Connect the ECT electrical connector. 4. Install the intake manifold cover, if necessary. Refer to Intake Manifold Cover Replacement . 5. Install the exhaust crossover. Refer to Exhaust Crossover Pipe Replacement (LZE/LZ4/LGD) . 6. Fill the cooling system. Refer to Cooling System Draining and Filling (LZE, LZ4, LGD, 9C1, 9C3, GE47716 Fill) or Cooling System Draining and Filling (LZE, LZ4, LGD Static Fill) . CAUTION: Refer to Fastener Caution . 2010 Chevrolet Impala LT 2010 ENGINE Engine Controls and Fuel - 3.5L - Impala

2011 Chevrolet Impala Service & Repair Manual

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