Engine Controls and Fuel - 3.6l - DTC p0335 to DTC p2544 Chevrolet Malibu VII

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions: Close routing of secondary ignition wires Close routing of aftermarket electrical equipment Close to solenoids, motors, and relays Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference.
Start the engine. Using the Live Plot function on the scan tool, select the Camshaft Position parameter. Change the minimum spec to 400 RPM and the maximum spec to 4,000 RPM. Select the crankshaft position sensor parameter. Change the minimum spec to 600 RPM and the maximum spec to 3,300 RPM.
Observe the scan tool.
Quickly accelerate and release the accelerator pedal several times. Do not exceed 3,200 RPM. The graphed lines on the Live Plot display should track together across the screen. If the vehicle passes the Circuit/System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Ignition OFF, disconnect the crankshaft position sensor connector.
Test for less than 1 ohms between low reference circuit terminal 1 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 V between the 5 V reference circuit terminal 3 and ground. If less than the specified range, test the 5 V 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 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 2 and ground. If less than the specified range, test the 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 signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Ignition ON, engine OFF, using a jumper wire connected to ground, momentarily touch the crankshaft position sensor signal circuit terminal 2 repeatedly. The Crankshaft Position Active Counter parameter should increment If the Crankshaft Position Active Counter parameter does not increment, replace the ECM. If the Crankshaft Position Active Counter increments, test or replace the crankshaft position sensor.

Component Test

IMPORTANT

You must perform the Circuit/System Testing before proceeding with Component Testing.

Inspect the crankshaft position sensor for looseness and correct installation. Remove the crankshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the crankshaft position sensor.
Connect the crankshaft position sensor connector to the crankshaft position sensor. Turn ON the ignition, with the engine OFF.
Observe the Crankshaft Position Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The Crankshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the crankshaft position sensor.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Crankshaft Position Sensor Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5 V Reference Circuit	P0651	P0335	P0651, P2135
Crankshaft Position Sensor Signal Circuit	P0335	P0335	P0335	P0336
Low Reference Circuit		P0335	P0335

DTCs P0340, P0341, P0345, P0346, P0365, P0366, P0380, P0381, P0641 or P0651 are not set.
The engine is cranking or running.
The DTC runs continuously when the above conditions are met.

IMPORTANT

The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor is more than 3 g/s, or by sensing camshaft position sensor pulses.

The ECM detects that the engine is running, but receives less than 51 or more than 65 crankshaft position sensor pulses each engine revolution for 8 of 10 engine revolutions.
The ECM detects that the engine is running, but more than 19 resyncs occur within 25 s.
The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 s.

DTC P0336 is a Type B DTC.
The camshaft position actuator is commanded to the Home or Parked position.
The ignition system defaults to a limp home mode. The camshaft position sensor is used to determine engine position.

DTC P0336 is a Type B DTC.

Schematic Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

If DTC P0335 is also set, diagnose P0335 first.
With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions: Close routing of secondary ignition wires Close routing of aftermarket electrical equipment Close to solenoids, motors, and relays Correct any wire harness routing or component placement conditions if it is determined to be a possible source of electrical interference.
Start the engine. Using the Live Plot function on the scan tool, select the Camshaft Position parameter. Change the minimum spec to 400 RPM and the maximum spec to 4,000 RPM. Select the crankshaft position sensor parameter. Change the minimum spec to 600 RPM and the maximum spec to 3,300 RPM.
Observe the scan tool.
Quickly accelerate and release the accelerator pedal several times. Do not exceed 3,200 RPM. The graphed lines on the Live Plot display should track together across the screen. If the vehicle passes the Circuit/System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Ignition OFF, inspect the crankshaft position 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 and contamination Crankshaft 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 «Camshaft Timing Drive Components Cleaning and Inspection»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-repair-instructions-off-vehicle-2-of-3) and «Crankshaft and Bearing Cleaning and Inspection»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-repair-instructions-off-vehicle-2-of-3) .

Inspect the crankshaft position sensor for looseness and correct installation. Remove the crankshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the crankshaft position sensor.
Connect the crankshaft position sensor connector to the crankshaft position sensor. Turn ON the ignition, with the engine OFF.
Observe the Crankshaft Position Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The Crankshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the crankshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Crankshaft Position Sensor Replacement

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5 V Reference Circuit	P0641, P0452, P0107, P0532, P0522	P0340, P0345, P0365, P0390	P0641
Camshaft Position Sensor Signal Circuit	P0340, P0345, P0365, P0390	P0340, P0345, P0365, P0390	P0340, P0345, P0365, P0390	P0341, P0346, P0366, P0391
Low Reference Circuit		P0340, P0345, P0365, P0390	P0340, P0345, P0365, P0390

The 4X camshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an output signal circuit. The camshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the camshaft position sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the camshaft position sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses camshaft position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.

DTC P0335, P0336, P0641 or P0651 is not set.
The engine is cranking or running.
The DTCs run continuously when the above conditions are met.

IMPORTANT

The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor is more than 3 g/s, or by sensing crankshaft position sensor pulses.

The ECM detects that the starter is commanded ON and the engine has been cranking for more than 4 s without a camshaft position sensor pulse. OR
The ECM detects that the engine has started, but did not received a camshaft position sensor pulse during the first engine revolution. OR
The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1,000 engine cycles.

DTCs P0340, P0345, P0365, and P0390 are Type B DTCs.
The camshaft position actuator is commanded to the Home or Parked position.
The ignition system defaults to a failed camshaft position sensor limp home mode.

DTCs P0340, P0345, P0365, and P0390 are Type B DTCs.
With a DTC set, the engine may crank for an extended period of time at start-up.

Diagnostic Aids

With a DTC set, the engine may crank for an extended period of time at start-up

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Start the engine. Using the Live Plot function on the scan tool, select the Camshaft Position parameter. Change the minimum spec to 400 RPM and the maximum spec to 4,000 RPM. Select the crankshaft position sensor parameter. Change the minimum spec to 600 RPM and the maximum spec to 3,300 RPM.
Observe the scan tool.
Quickly accelerate and release the accelerator pedal several times. Do not exceed 3,200 RPM. The graphed lines on the Live Plot display should track together across the screen. If the vehicle passes the Circuit/System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Ignition OFF, disconnect the affected camshaft position sensor connector.
Test for less than 1 ohms between the low reference circuit terminal 1 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 V between the 5 V reference circuit terminal 3 and ground. If less than the specified range, test the 5 V 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 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 2 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 camshaft position sensor signal circuit terminal 2 repeatedly. The applicable camshaft position active counter parameter should increment. If the camshaft position active counter does not increment, replace the ECM. If the circuits test normal, replace the camshaft position sensor.

IMPORTANT

You must perform the Circuit/System Testing before proceeding with Component Testing.

Inspect the camshaft position sensor for looseness and correct installation. Remove the camshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the camshaft position sensor.
Connect the camshaft position sensor connector to the camshaft position sensor. Turn ON the ignition, with the engine OFF.
Ignition ON and engine OFF. Observe the applicable Camshaft Position Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The Camshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the camshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5 V Reference Circuit	P0107, P0452, P0522, P0532, P0641	P0340, P0345, P0365, P0390	P0641
Camshaft Position Sensor Signal Circuit	P0340, P0345, P0365, P0390	P0340, P0345, P0365, P0390	P0340, P0345, P0365, P0390	P0341, P0346, P0366, P0391
Low Reference Circuit		P0340, P0345, P0365, P0390	P0340, P0345, P0365, P0390

DTC P0335, P0336, P0641 or P0651 is not set.
The engine is cranking or running.
The DTCs run continuously when the above conditions are met.

IMPORTANT

The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor is more than 3 g/s, or by sensing crankshaft position sensor pulses.

The ECM detects that the engine has started, but has received either of the following during the first engine revolution: Less than or more than 4 camshaft position sensor pulses, if equipped with an automatic transmission Less than 4 or more than 8 camshaft position sensor pulses, if equipped with a manual transmission OR
The ECM detects that the engine is running but receives less than 398 camshaft position or more than 402 camshaft position sensor pulses per 100 engine cycles in 800 of 1000 engine cycles.

DTCs P0341, P0346, P0366, and P0391 are Type B DTCs.
The camshaft position actuator is commanded to the Home or Parked position.
The ignition system defaults to a failed camshaft position sensor based on the crankshaft position sensor.

DTCs P0341, P0346, P0366,, and P0391 are Type B DTCs.
With a DTC set, the engine may crank for an extended period of time at start-up.

With a DTC set, the engine may crank for an extended period of time at start-up

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

If DTC P0340, P0345, P0365, or P0390 are also set, diagnose them first
With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions: Close routing of secondary ignition components Close routing of aftermarket electrical equipment Close to solenoids, motors, and relays Correct any wire harness routing or component placement conditions if it is determined to be a possible source of electrical interference.
Observe the following parameters are all incrementing: Exhaust Camshaft Position Bank 1 Active Intake Camshaft Position Bank 1 Active Exhaust Camshaft Position Bank 2 Active Intake Camshaft Position Bank 2 Active
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Ignition OFF, inspect the camshaft position 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 Camshaft end play for excess movement-Refer to «Engine Mechanical Specifications (LY7)»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-specifications__engine-mechanical-specifications-ly7) . 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 «Camshaft Timing Drive Components Cleaning and Inspection»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-repair-instructions-off-vehicle-2-of-3) and «Camshaft Cleaning and Inspection»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-repair-instructions-off-vehicle-2-of-3) .

IMPORTANT

You must perform the Circuit/System Testing before proceeding with Component Testing.

Inspect the camshaft position sensor for looseness and correct installation. Remove the camshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the camshaft position sensor.
Connect the camshaft position sensor connector to the camshaft position sensor. Turn ON the ignition, with the engine OFF.
Ignition ON and engine OFF. Observe the applicable Camshaft Position Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The Camshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the camshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition Coil 1 Control Circuit	P0300, P0351	P0300, P0351	P0300, P0351	P0300, P0351
Ignition Coil 2 Control Circuit	P0300, P0352	P0300, P0352	P0300, P0352	P0300, P0352
Ignition Coil 3 Control Circuit	P0300, P0353	P0300, P0353	P0300, P0353	P0300, P0353

The ignition system on this engine uses an individual module/coil for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the 6 individual ignition control (IC) circuits. When the ECM commands the IC circuit ON, electrical current will flow through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM will command the IC circuit OFF, interrupting current flow through the primary winding. The magnetic field created by the primary winding will collapse across the secondary coil windings, producing a high voltage across the spark plug electrodes. The ECM uses information from the crankshaft position (CKP) sensor, and the camshaft position (CMP) sensor for sequencing and timing of the spark events. The ECM monitors each IC circuit for improper voltage levels. Each ignition module/coil assembly has the following electrical circuits

An ignition voltage circuit
A ground
An IC control circuit
A low reference circuit

The engine is cranking or running.
The DTCs run continuously when the above condition is met.

The PCM detects a fault in an ignition coil control circuit for 90 out of 100 engine cycles.

DTCs P0351, P0352, P0353, P0354, P0355, and P0356 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

With the engine running, observe the Cylinder 1 through 6 IC circuit status parameters with the scan tool. All of the parameters should display OK.
With the engine running, observe the Misfire Current counters using the scan tool. The counters should not be incrementing.

With the engine running, observe the applicable Cylinder IC Circuit Status parameters with the scan tool. If a parameter displays IC CKT Short Gnd Test or IC CKT Open Test Fault, test for an open/high resistance or a short to ground in the affected IC circuit. All wire circuit resistance should measure less than 2 ohms. If a parameter displays short to Volts Test Fault, test for a short to voltage in the affected IC circuit.
Connect jumper wires from the harness connector of the ICM to the corresponding terminals of the ICM.
Using the jumper wires, exchange the affected IC control circuit with a known good IC control circuit. Also exchange the spark plug wires of the corresponding coils.
Start the engine.
Observe the Misfire Current counters with the scan tool. If the misfire transfers with the suspect IC control circuit, replace the ECM. If the misfire remains with the coil, replace the ICM.

Component Testing

With positive polarity to the low reference terminal, measure for 9,000-11,000 ohms at 20-23°C (68-74°F) room temperature between each of the ignition coil control terminals and the low reference terminal of the ICM. If the resistance is not within the specified range, replace the ICM.
Measure for 7,000-15,000 ohms at 20-23°C (68-74°F) room temperature between each pair of coil towers on the ICM. If the resistance is not within the specified range, replace the ICM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Ignition Coil Replacement - Bank 1»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Ignition Coil Replacement - Bank 2»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A 3-way catalytic converter (TWC) controls emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx). The catalyst within the converter promotes a chemical reaction, which oxidizes the HC and the CO that are present in the exhaust gas. This process converts the HC and the CO into water vapor and carbon dioxide (CO2), and reduces the NOx, converting the NOx into nitrogen. The catalytic converter also stores oxygen. The engine control module (ECM) monitors this process by using a heated oxygen sensor (HO2S) that is in the exhaust stream after the TWC. The HO2S 2 produces an output signal that the ECM uses to calculate the oxygen storage capacity of the catalyst. This indicates the ability of the catalyst to convert the exhaust emissions efficiently. The ECM monitors the efficiency of the catalyst by allowing the catalyst to heat, then wait for a stabilization period while the engine is idling. The ECM then adds and removes fuel while monitoring the HO2S 2. When the catalyst is functioning properly, the HO2S 2 response to the extra fuel is slow compared to the response of the HO2S 1, which is located before the TWC. When the HO2S 2 response is near that of the HO2S 1, the oxygen storage capability and efficiency of the catalyst may be degraded below an acceptable threshold.

DTCs P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0068, P0101, P0012, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0151, P0152, P0153, P0154, P0155, P0156, P0157, P0158, P0160, P0161, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0325, P0327, P0332, P0335, P0336, P0340, P0341, P0442, P0443, P0446, P0449, P0455, P0496, P0506, P0507, P1133, P1153, P1258, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2270-P2273, P2A00, or P2A03 are not set.
Where applicable DTCs P2270, P2271, P2272, P2273, P2A01, P2A04 are not set.
Before the ECM performs the idle test, the vehicle must be driven under the following conditions: The engine speed is greater than 1,000 RPM The engine run time is greater than 10 minutes Both conditions exist for greater than 1 minute
The throttle is in the rest position.
The intake air temperature (IAT) is between -20 to +85°C (-4 to +185°F).
The ignition voltage is greater than 11 volts.
The engine coolant temperature (ECT) is between 70-125°C (156-257°F).
The barometric pressure (BARO) is greater than 70 kPa.
The vehicle speed is less than 3 km/h (2 mph).
The Fuel Trim Learn is enabled.
The short term fuel trim (FT) is between -10 and +10 percent.
The catalytic converter (TWC) calculated temperature is greater than 450°C (1,742°F).
The engine is operating in Closed Loop.
The transmission is not in P/N (automatic transmission only).

This diagnostic attempts one test during each valid idle period once the above conditions have been met. This diagnostic attempts up to 6 tests during each drive cycle.

The ECM determines that the efficiency of the catalyst has degraded below a calibrated threshold.

DTC P0420 and P0430 are Type A DTCs.

Conditions for Clearing the DTC

DTC P0420 and P0430 are Type A DTCs.

Note. A new converter with less than 161 kilometers (100 miles) on it may set DTC P0420 due to out-gassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition.

Inspect for the following conditions, which may cause a catalytic converter to degrade

An engine misfire
High engine oil or high coolant consumption
Retarded spark timing
A weak or poor spark
A lean fuel mixture
A rich fuel mixture
A damaged oxygen sensor or wiring harness

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Engine idling, observe the DTC information with a scan tool. Verify there are no HO2S or misfire DTCs set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to diagnosis the applicable DTC, before proceeding with this diagnostic procedure.
Verify the following conditions do not exist with the catalytic converter: Dents A severe discoloration caused by excessive temperatures Road damage An internal rattle caused by damaged catalyst substrate Restrictions If a condition is found, replace the catalytic converter.
Verify the following conditions do not exist with the exhaust system: Leaks Physical damage Loose or missing hardware Properly torqued HO2S If a condition is found, repair the exhaust system.
Verify the following conditions do not exist with the HO2S 2: A grounded wiring harness Damage If a condition is found, replace the HO2S 2.
If no physical condition is detected and the HO2S 2 is as active as the HO2S 1 after operating the engine at 1,500 RPM for 1 minute and then returning to a stabilized idle, then replace the appropriate catalytic converter.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Exhaust Leakage»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
«Restricted Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system)
«Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Catalytic Converter Replacement - Left Side (LZ4)»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system) or «Catalytic Converter Replacement - Left Side (LY7)»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system)
«Catalytic Converter Replacement - Right Side (LZ4)»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system) or «Catalytic Converter Replacement - Right Side (LY7)»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system)

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine off natural vacuum (EONV) test is the small leak detection diagnostic for the evaporative emission system. This diagnostic tests the Evaporative Emission (EVAP) system for a small leak when the key is turned OFF and the correct conditions are met. Heat from the exhaust system is transferred into the fuel tank while the vehicle is operating. When the vehicle is turned OFF and the EVAP system is sealed a change in the fuel tank vapor temperature occurs which results in a corresponding pressure change in the fuel tank vapor space. This change is monitored by the engine control module (ECM) using the fuel tank pressure sensor input. With a leak in the system, the amount of pressure change will be less than that of a sealed system.

IMPORTANT

The following conditions must be met prior to ignition OFF.

DTCs P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0128, P0443, P0446, P0449, P0452, P0453, P0463, P0503, P1106, P1107, P1111, P1112, P1114, P1115, P1516, P2101, P2108, P2120, P2125, P2129, P2138, P2610 are not set.
The diagnostic runs once after a cold start drive cycle.
The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up engine coolant temperature (ECT) is less than 30°C (86°F).
The start-up IAT and ECT are within 8°C (15°F).
The barometric pressure (BARO) is greater than 74 kPa.
The ambient air temperature is between 2-32°C (36-90°F).
The engine run time minimum is 10 minutes.
The vehicle has traveled greater than 5 kilometers (3 miles) this trip.
The ECT is greater than 70°C (158°F).
The fuel level is between 15-85 percent.
The ignition is OFF.
A refueling event is not detected.
DTC P0442 runs once per drive cycle during the hot soak period after the ignition is turned OFF and may require up to 45 minutes to complete. The controller will not make more than 2 test attempts per day. The time since the last completed EONV test must be at least 17 hours

The ECM detects a pressure change that is less than a calibrated amount.
The ECM must complete several EONV tests before the diagnostic can turn the MIL ON or OFF.

DTC P0442 is a Type A DTC.

The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. When injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until smoke is observed then close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV at the service port to allow the system to fill faster.
To help locate intermittent leaks using the J 41413-200 , move all EVAP components while observing smoke with the J 41413-SPT .
Individual components can be isolated and tested using adapters in the J 41413-300 .
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the EVAP system and then observe the FTP parameter for vacuum decay.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

DTC Type Reference

Description and Operation

Scan Tool Reference

Control Module References for scan tool information

Special Tools

CH-48096 EVAP Service Access Port Tool
J 41413-200 Evaporative Emissions System Tester (EEST)
J 41413-300 EVAP Cap and Plug Kit
J 41413-SPT High Intensity White Light
J 41413-VLV EVAP Service Port Vent Tool

IMPORTANT

Refer to the J 41413-200 operation manual for detailed instructions in Evaporative Emission System Diagnosis . Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize. Ensure that the underbody temperature of the vehicle and the tester are similar.

Disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096 . Connect the J 41413-200 to the vehicle at the EVAP service port adapter.
Using a scan tool close the EVAP canister vent valve to seal the EVAP system.
Use the flow meter on the J 41413-200 , calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system. If a leak is detected, use the J 41413-200 to apply smoke to the EVAP system at the service port or the purge tube until the leak is located using the J 41413-SPT .

Repair Verification

Seal the EVAP system and use the flow meter on the J 41413-200 , calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.
Clear DTCs.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	High Resistance	Open	Short to Voltage
Ignition 1 Voltage - Purge Supply	P0443	P0443	P0443
Battery Positive - Vent Supply	P0449	P0449	P0449
EVAP Purge Solenoid Control	P0443	P0443	P0443	P0443
EVAP Vent Solenoid Control	P0449	P0449	P0449	P0449

An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge solenoid valve. The engine control module (ECM) grounds the EVAP canister purge solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. The EVAP canister purge solenoid valve is pulse width modulated (PWM). A scan tool will display the amount of ON time as a percentage.

Battery voltage is supplied to the EVAP canister vent solenoid valve. The ECM grounds the EVAP canister vent solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. A scan tool will display the commanded state of the EVAP canister vent solenoid valve as ON or OFF.

The ignition is ON.
The system voltage is between 6-18 volts.
DTC P0443 and P0449 run continuously when the above conditions are met.

The control module detects that the commanded state of the driver and the actual state of the control circuit do not match, for a minimum of 12 seconds.

DTCs P0443 and P0449 are Type B DTCs.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Troubleshooting with a Test Lamp»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

P0443

With the ignition ON, and the engine OFF, you should hear a clicking sound when the EVAP canister purge solenoid valve is commanded to 50 percent with a scan tool. The clicking sound should stop when the EVAP canister purge solenoid valve is commanded to 0 percent. The rate at which the valve cycles should increase when the commanded state is increased, and decrease when the commanded state is decreased.

P0449

With the ignition ON and the engine OFF, command the EVAP vent solenoid ON and OFF with a scan tool.
Listen for a click when the valve operates. Verify that both the ON, and the OFF states are commanded.

Ignition OFF, disconnect the harness connector at the EVAP canister purge or vent solenoid valve.
Ignition ON, verify that a test lamp illuminates between the B+ or ignition circuit terminal A and ground. If the test lamp does not illuminate, test the B+ or ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test or replace the appropriate solenoid valve.
Connect a test lamp between the control circuit terminal B and the B+ or ignition circuit terminal A.
Energize the solenoid with a scan tool. Command the EVAP canister purge solenoid valve to 50 percent with a scan tool, or the EVAP canister vent solenoid valve ON and OFF. The test lamp should respond to the command. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the control module. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the control module.
If all circuits test normal, replace the appropriate solenoid valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Evaporative Emission Canister Purge Solenoid Valve Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Evaporative Emission Canister Vent Solenoid Valve Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The engine control module (ECM) commands the EVAP canister purge solenoid valve Open and the EVAP canister vent solenoid valve Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the ECM commands the EVAP canister purge solenoid valve Closed and the EVAP canister vent solenoid valve Open. The ECM monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inch H2O in a calibrated time, this DTC sets.

FTP Sensor Signal Voltage	Fuel Tank Pressure
Less than 1.5 V	Positive Pressure
More than 1.5 V	Negative Pressure/Vacuum

DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0125, P0128, P0502, P1106, P1107, P1111, P1112, P1114, P1115, P1125, P1516, P2101, P2108, P2119, P2120, P2125, P2138 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The start-up engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up ECT and IAT are within 9°C (16°F) of each other.
The vehicle speed sensor (VSS) is less than 129 km/h (80 mph).
DTC P0446 runs once per trip when the above conditions have been met.

The FTP sensor is more than -11 inches H2O vacuum for 2 seconds during the 13 minute test.

The FTP is less than -2.5 inches H2O or more than +5 inches H2O for 3 seconds after a cold start ignition ON.

DTC P0446 is a Type B DTC.

An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.
An EVAP canister filter that is restricted can cause this DTC to set. Refer to «Evaporative Emission Canister Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions) .

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON and fuel cap removed, verify that the Fuel Tank Pressure Sensor parameter is between 1.3-1.7 volts. If not within the specified range, go to the «Fuel Tank Pressure Sensor»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0335-to-dtc-p2544__fuel-tank-pressure-sensor) section in Circuit/System Testing.
Install the fuel cap.
With the engine running, the EVAP canister vent solenoid valve open, use a scan tool to command the EVAP canister purge solenoid valve to 100 percent. The fuel tank vacuum should not increase to more than -15 mmHg (-8 inches H2O). If the fuel tank vacuum is greater than the specified range, go to the «Restriction»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0335-to-dtc-p2544__restriction) section in Circuit/System Testing.
Using the scan tool, decrease the canister purge duty cycle from 100 percent to 0 percent. The vacuum should decrease to near zero. If the fuel tank vacuum does not return to zero or appears to decrease too slowly go to the «Restriction»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0335-to-dtc-p2544__restriction) section in Circuit/System Testing.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note. Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

Restriction

With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than -15 mmHg (-8 inches H2O). If the fuel tank vacuum is greater than the specified value, isolate the restriction by disconnecting one component at a time while the EVAP canister purge solenoid valve is commanded to 100 percent and the vent valve is open.
Using the scan tool, decrease the canister purge duty cycle from 100 percent to 0 percent. The vacuum should decrease to near zero. If the fuel tank vacuum does not return to zero, or appears to decrease too slowly, inspect the components in the EVAP vent system for a restriction.

Fuel Tank Pressure Sensor

Ignition OFF, disconnect the harness connector at the fuel tank pressure sensor.
Ignition OFF, test for less than 5 ohms between the low reference circuit terminal and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the fuel tank pressure sensor.

«Fuel Tank Pressure Sensor Replacement (LAT,NU5,NT7)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-repair-instructions)
«Evaporative Emission Canister Vent Solenoid Valve Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Evaporative Emission Canister Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

With the engine running, the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than -15 mmHg (-8 inches H2O).

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
FTP Sensor 5-Volt Reference	P0107, P0452, P0532, P0641	P0451	P0452	P0453, P0641
FTP Sensor Signal	P0452	P0451	P0452	P0453	P0451, P0454
FTP Sensor Low Reference		P0446, P0451	P0446

Typical Scan Tool Data

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, Engine OFF Paremeter Normal Range: 1.3-1.7V
FTP Sensor 5-Volt Reference	0V	0-1.5V	5V
FTP Sensor Signal	0V	0V	5V
FTP Sensor Low Reference		4.5V

FTP Sensor Voltage

The fuel tank pressure (FTP) sensor measures air pressure or vacuum in the evaporative emission (EVAP) system. The control module supplies a 5-volt reference and a low reference circuit to the FTP sensor. The FTP sensor signal voltage varies depending on EVAP system pressure or vacuum. The controller also uses this FTP signal to determine atmospheric pressure for use in the engine-off small leak test, DTC P0442. Before using this signal as an atmospheric reference it must first be re-zeroed.

P0451

DTC P0451 runs only when the engine-off natural vacuum small leak test, P0442, executes.
The number of times this test runs can range from 0-2 per engine-off period. The length of the test can be up to 10 minutes.

P0452 and P0453

DTC P0452 and P0453 run continuously when the ignition is ON.

P0454

DTC P0454 runs only when the engine-off natural vacuum small leak test, P0442, executes.
This test can run once per engine-off period. The length of the test can be up to 10 minutes.
A refueling event is not detected.

This DTC will set if the controller is unable to re-zero the FTP sensor voltage within a calibrated range during the engine-off small leak test, P0442.

P0452

The FTP sensor voltage is less than 0.1 volt.

P0453

The FTP sensor voltage is more than 4.9 volts.

If, during the engine-off natural vacuum small leak test, P0442, the engine control module (ECM) detects an abrupt FTP signal change, other than a refueling event, this DTC will set. An abrupt change is defined as a change of 0.45 inch H2O in the span of 1 second.

DTCs P0451 and P0454 are Type A DTCs.
DTCs P0452 and P0453 are Type B DTCs.

DTCs P0451 and P0454 are Type A DTCs.
DTCs P0452 and P0453 are Type B DTCs.

Ensure that the reference port on the FTP sensor is unobstructed.
Scan tool output controls, snapshot, and the plot function can help detect erratic sensor operation. To observe the Fuel Tank Pressure Sensor signal under vacuum conditions, use the Quick Snapshot and the EVAP Purge/Seal function to capture data while commanding purge to 20 percent. Then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor range by applying pressure with J 41413-200 (J 41413-100) while taking a snapshot with the scan tool.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 41413-200 (J 41413-100) Evaporative Emissions System Tester (EEST)

Remove the fuel cap.
Ignition ON, engine OFF.
Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
The FTP Sensor parameter should be 1.3-1.7 volts

Ignition OFF, disconnect the harness connector at the FTP sensor.
Ignition OFF, ensure that the ECM completely powers down and test for less than 5 ohms between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the control module.
Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.
Verify the scan tool FTP sensor parameter is less than 0.2 volt. If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the control module.
Install a 3A fused jumper wire at the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool FTP sensor voltage parameter is greater than 4.7 volts. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.
If all circuits test normal, replace the FTP sensor.

For DTC P0452 or P0453, perform the «Diagnostic Repair Verification»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-repair-verification) after completing the diagnostic procedure.
For DTC P0451 or P0454, clear DTCs with a scan tool.
«Fuel Tank Pressure Sensor Replacement (LAT,NU5,NT7)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The ECM tests the Evaporative Emission (EVAP) System for a large leak or restrictions to the purge path in the EVAP system. When the enabling criteria has been met the ECM commands the EVAP canister vent solenoid valve ON and the EVAP canister purge solenoid valve ON, allowing vacuum into the EVAP system. The ECM monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.

Before the ECM can report DTC P0455 failed, DTC P0496 must run and pass.
DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0442, P0443, P0446, P0449, P0452, P0453, P1111, P1112, P1114, P1115, P1125, P1135, P1351, P1352, P1361, P1362, P1516, P1548, P2101, P2107, P2108, P2119, P2120, P2125, P2135, P2138 are not set.
The engine is running.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The start-up engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up ECT and IAT are within 9°C (16°F) of each other.
DTC P0455 runs once per cold start within 10 minutes of start-up.

The EVAP system is not able to achieve or maintain a calibrated level of vacuum within a set amount of time.

DTC P0455 is a Type B DTC.

Inspect for a loose, missing, damaged, or incorrect fuel fill cap.
Inspect for a damaged fuel filler neck seal surface.
A blockage or restriction in the EVAP purge solenoid valve, purge pipe, EVAP canister, or vapor pipe, can cause this DTC to set.
The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. For example, when injecting smoke at the service port adapter remove the fuel fill cap, or temporarily leave the vent open, until smoke is observed, then close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV at the service port adapter to allow the system to fill faster.
To help locate intermittent leaks using the J 41413-200 , move all EVAP components while observing smoke with the J 41413-SPT .
Individual components can be isolated and tested using adapters in the J 41413-300 .
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the EVAP system and then observe the FTP parameter for vacuum decay.

Schematic Reference

Connector End View Reference

Description and Operation

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

CH 48096: Evaporative Emissions Service Access Port Tool
J 41415-30: Fuel Tank Adapter
J 41413-200: Evaporative Emissions System Tester (EEST)
J 41413-300: Evaporative Emissions Cap and Plug Kit
J 41413-311: Evaporative Emissions Plug
J 41413-SPT: High Intensity White Light
J 41413-VLV: Evaporative Emissions Service Port Vent Tool
For equivalent regional tools, refer to «Special Tools»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-special-tools-and-equipment) .

Note. Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize. Refer to the J 41413-200: EEST operation manual for detailed instructions in Evaporative Emission System Diagnosis .

Disconnect the purge tube at the quick connector on the evaporative emission canister side of the Q12 evaporative emission canister purge solenoid valve. Install the CH 48096: Port Tool between the disconnected purge tube and the purge solenoid valve. Connect the J 41413-200: EEST to the service access port tool.
Use a scan tool to seal the evaporative emission system.
Use the flow meter on the J 41413-200: EEST, calibrated to 0.51 millimeter (0.020 inch) to determine that there is no leak in the evaporative emission system. If a leak is detected, use the J 41413-200: EEST to apply smoke to the evaporative emission system at the purge tube until the leak is located using the J 41413-SPT: White Light.
To test for a restriction, connect the J 41413-200: EEST nitrogen/smoke hose to the to the J 41413-311: Evaporative Emission Plug brass cone adapter. Disconnect the hose at the fuel cap end of the J 41415-30: Adapter. Connect the J 41413-311: Evaporative Emission Plug to the disconnected hose on the J 41415-30: Adapter. Install the J 41415-30: Adapter filler neck end only to the vehicle.
Allow the engine to idle.
Use the Purge/Seal function to seal the system with a scan tool.
Command the EVAP Purge Solenoid Valve to 30 percent.
The vacuum/pressure gauge on the J 41413-200: EEST and the fuel tank pressure parameter on the scan tool should both show vacuum. If the vacuum/pressure gauge shows vacuum, but the fuel tank pressure parameter does not show vacuum, replace the fuel tank pressure sensor. If neither the fuel tank pressure parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 V, and the values are similar between the scan tool and the vacuum/pressure gauge on the J 41413-200: EEST. If the values are not similar, or the voltage did not reach 3.2 V, replace the B150 fuel tank pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Fuel Tank Pressure Sensor Replacement (LAT,NU5,NT7)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module (ECM) replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This DTC tests for undesired intake manifold vacuum flow to the evaporative emission (EVAP) system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this DTC sets.

The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent solenoid valves.

Control Module Command	EVAP Canister Purge Solenoid Valve	EVAP Canister Vent Solenoid Valve
ON	Open	Closed
OFF	Closed	Open

DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0128, P0442, P0443, P0446, P0449, P0452, P0453, P0445, P1106, P1107, P1111, P1112, P1114, P1115, P1516 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 74 kPa.
The fuel level is between 15-85 percent.
The engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up ECT and IAT are within 9°C (16°F) of each other.
The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).
The FTP sensor is less than -2.5 inches H2O at ignition ON.
DTC P0496 runs once per cold start for 96 seconds.

The control module detects vacuum during a non-purge condition.

DTC P0496 is a Type B DTC.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Troubleshooting with a Test Lamp»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Description and Operation

Evaporative Emission Canister Purge Solenoid Valve Replacement

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, engine OFF.
Seal the EVAP system using the Purge/Seal function with a scan tool.
Start the engine.
Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7 volts after 90 seconds. If the Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the EVAP canister purge solenoid valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The throttle actuator control (TAC) motor is controlled by the engine control module (ECM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the ECM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate.

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 has been running for greater than 60 seconds.
The engine is idling for greater than 10 seconds.
The intake air temperature (IAT) is more than -40°C (-40°F).
The AC mode state has not changed.
The barometric pressure (BARO) is greater than 72 kPa.
The power steering load state has not changed.
The transmission gear selector state has not changed.
The engine coolant temperature (ECT) is greater than -40°C (-40°F).
The system voltage is between 9-18 volts.
The vehicle speed is less than 4.8 km/h (3 mph).
The DTCs run continuously when the above conditions are met.

P0506

The ECM detects that the actual idle speed is approximately 100 RPM lower than the desired idle speed continuously.

P0507

The ECM detects that the actual idle speed is approximately 200 RPM higher than desired idle speed.

DTC P0506 and P0507 are Type B DTCs.

A stalling condition can cause DTC P0506 to set.
An intermittent vehicle speed sensor (VSS) signal can cause DTC P0507 to set.
An intermittent clutch pedal position sensor signal, if equipped, can cause DTC P0506 to set.

Schematic Reference

Connector End View Reference

Throttle Actuator Control (TAC) System Description

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Using a scan tool compare the desired engine idle speed to the actual engine idle speed. Actual engine idle speed should be no greater than 100 RPM below desired. Actual engine idle speed should be no greater than 200 RPM above desired.
Verify that there are no other DTCs set. If any other DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Inspect for any condition that can reduce idle speed by increasing engine load. Incorrect torque converter clutch (TCC) operation Accessories that require additional torque to operate Excessive deposits in the throttle body Restricted exhaust Mechanical conditions that limit engine speed Repair any conditions, if necessary.
Inspect for the following conditions: Vacuum leaks A faulty positive crankcase ventilation (PCV) valve

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Throttle Body Inspection and Cleaning

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each of the diagnostic category.

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM) and the throttle actuator control (TAC) system. This diagnostic also addresses if the ECM is not programmed.

The ECM monitors its ability to read and write to the memory. It also monitors a timing function. The ECM and the TAC processors are used to monitor the TAC system data. Both processors monitor the other processors data to verify that the indicated APP calculation is correct. The ECM performs an intrusive test in order to confirm that the APP signals are not shorted together. The ECM accomplishes this by pulling the APP sensor 2 low momentarily and looking for sensor 1 to also be pulled low.

P0601, P0604, P0606

The ignition switch is in Run or Crank.
These DTCs run continuously when the above condition is met.

P0602, P0603, P062F

The ignition switch is in ON.
These DTCs run once per ignition cycle.

P0607

The ignition switch is in Unlock, Accessory, Run or Crank.
The system voltage is more than 5.23 V.
DTCs P0601, P0602, P0603, P0604, P0606, P062F, P0641, P0651, P2610 are not set
DTC P0607 runs continuously when the above conditions are met.

P060D

DTC P0606 is not set.
The ignition switch is in the Unlock, Accessory, Run, or Crank position.
The system voltage is more than 5.23 V.
DTC P060D runs continuously when the above conditions are met.

P2610

The ECM is powered down.
The intake air temperature is between -40 to +125°C (-40 to +257°F).
DTC P2610 runs once per ignition cycle.

Conditions for Setting the DTCs

The ECM detects an internal failure or incomplete programming for more than 10 s.

Actions Taken When the DTC Sets

DTCs P0601, P0602, P0603, P0604, P0606, P060D, and P062F are Type A DTCs.
DTC P0607 is a Type C DTC.
DTC P2610 is a Type B DTC.

DTCs P0601, P0602, P0603, P0604, P0606, P060D, and P062F are Type A DTCs.
DTC P0607 is a Type C DTC.
DTC P2610 is a Type B DTC.

Verify that the battery cables are clean and tight, and the battery is fully charged. Refer to Battery Inspection/Test .

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 should not reset.

Test the voltage and ground inputs to the K20 ECM for the following: A short An open High resistance
Observe the DTCs with a scan tool. If DTC P0602 is set, attempt to program the K20 ECM before replacing the K20 ECM. Refer to «Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K20 ECM replacement, setup, and programming. If DTC P0602 resets, replace the K20 ECM.
Observe the DTC information with a scan tool. DTC P0601, P0603, P0604, P0605, P0606, P0607, P060D, P062F, or P2610 should not set. If a DTC failed this ignition, replace the K20 ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, programming and setup

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) has a 5 V reference buss for each 5 V reference circuit. The circuits are called 5 V reference 1 and 5 V reference 2. Each bus provides a 5 V reference for more than one sensor. A fault condition on one 5 V reference circuit will affect the other 5 V reference circuits connected to that reference bus. The ECM monitors the voltage on the 5 V reference circuits.

DTCs P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060D, P062F and P2610 are not set.
The ignition is ON.
The ignition voltage is greater than 5.23 V.
The DTCs run continuously when the above conditions are met.

The ECM detects a voltage out of range condition on the 5 V reference 1 or 2 bus for greater than 0.5 s.

DTC P0641 and P0651 are Type A DTCs.

The 5 V reference 1 bus provides 5 V to the following sensors: B74 manifold absolute pressure (MAP) sensor B150 fuel tank pressure (FTP) sensor B107 accelerator pedal position (APP) sensor 2 B1 air conditioning (A/C) refrigerant pressure sensor All four B23 camshaft position sensors
The 5 V reference 2 bus provides 5 V to the following sensors: B107 APP sensor 1 Q38 throttle position sensor 1 and 2 B26 crankshaft position sensor
It may be possible to locate the fault by disconnecting one component at a time from the affected 5 V reference circuit while viewing the 5 V Reference circuit status parameter on the scan tool. The scan tool parameter will change from Fault to OK when the source of the fault is disconnected. If all 5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Observe the scan tool 5 V reference 1 and the 5 V reference 2 parameters. Verify the parameters display between 4.8-5.2 V.
Ignition ON, observe the DTC information with a scan tool. DTCs P0641 and P0651 should not set on this ignition cycle.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note. A short to voltage on the signal circuit of certain components may cause this DTC to set.

Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to «Diagnostic Aids»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0335-to-dtc-p2544) for the appropriate sensors.
Ignition ON, measure for 4.8-5.2 V between one of the 5 V reference circuits and ground. If less than the specified range, test for a short to ground on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM. If greater than the specified range, test for a short to voltage on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
Connect each component associated with the 5 V reference circuit, one at a time, while monitoring the voltage. Verify the voltage remains between 4.8-5.2 V. If not within the specified range when a component is connected, test the signal circuit for a short to voltage. If the circuit tests normal, replace the appropriate component.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Accelerator Pedal Position Sensor Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement»(/chevrolet/malibu/vii-2008-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
«Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Crankshaft Position Sensor Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Fuel Tank Pressure Sensor Replacement (LAT,NU5,NT7)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-repair-instructions)
«Manifold Absolute Pressure Sensor Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Throttle Body Assembly Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open	Short to Voltage
MIL Voltage Supply	P0650	P0650
MIL Control	P0650*	P0650	P0650
*The MIL remains ON

The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC).

The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service. The engine control module (ECM) monitors the MIL control circuit for conditions that are incorrect for the commanded states of the MIL. For example, a failure condition exists if the ECM detects low voltage when the MIL is commanded OFF, or high voltage when the MIL is commanded ON.

The ECM has commanded the MIL ON and OFF at least once during the ignition cycle.
DTC P0650 runs continuously when the ignition is ON.

The ECM detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for more than one second.

DTC P0650 is a Type B DTC.

If the condition is intermittent, move the related harnesses and connectors with the engine operating. Monitor the scan tool Circuit Test Status parameters for the component. The Circuit Test Status parameter will change from OK or Not Run to Fault if there is a condition with the circuit or a connection.

Schematic Reference

«Engine Controls Schematics»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-wiring-schematic-diagrams)
«Instrument Cluster Schematics»(/chevrolet/malibu/vii-2008-2012/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF as commanded.
Command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters: MIL Ckt Short Gnd Test Status MIL Ckt Open Test Status MIL Ckt Short Volts Test Status Each parameter should change from OK to Not Run or from Not Run to OK.
Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Ignition ON, verify that the (IPC) warning indicators are illuminated. If the IPC warning indicators are not illuminated, test the IPC ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the IPC.
Ignition OFF, disconnect the ECM X1 harness connector. Ignition ON, the MIL should not illuminate. If the MIL is illuminated, test the MIL control circuit terminal 12 for a short to ground. If the circuit tests normal, replace the IPC.
Ignition ON, connect a 3A fused jumper wire between the MIL control circuit terminal 12 and ground. The MIL should illuminate. If the MIL does not illuminate, test the MIL control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the IPC/bulb.
If all circuits/connections test normal, replace the ECM. Ignition ON, verify that the IPC warning indicators are illuminated.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Instrument Cluster Replacement»(/chevrolet/malibu/vii-2008-2012/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Battery Supply Voltage - Coil	P0685	P0685
Battery Supply Voltage - Armature
Relay Control Circuit	P0685	P0685, P1682	P0685, P0690, P1682, P2101
Relay Feedback Circuit			P0690

Display Parameters	Normal Range	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, with the engine OFF, powertrain relay commanded ON
Engine Controls Ignition Relay Control Circuit Test Status	OK/Not Run	Short to GRD/Open	Short to GRD/Open	Short to B+
Engine Controls Ignition Relay Command	ON	ON	ON	ON
Engine Controls Ignition Relay Feedback Signal	12-12.9 V	0.0 V	0.0 V	12-12.9 V

Engine Controls Ignition Relay Feedback Signal

The engine controls ignition relay or powertrain relay is a normally open relay. The relay switch is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the switch contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver. When the ECM commands the powertrain relay ON, ignition voltage is supplied to several fuses in the under-hood fuse block.

The ignition 1 voltage that is supplied to the ECM provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed.

The ignition is ON.
The ignition voltage is between 11-18 V.
The DTC runs continuously when the above conditions are met.

P0685

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 2 s.

P0690

The ECM detects the engine controls ignition relay feedback circuit is greater than 2 V when the relay is commanded OFF.
The ECM detects the engine controls ignition relay feedback circuit is greater than 18 V when the relay is commanded ON.
The condition is present for greater than 2 s.

DTCs P0685 and P0690 are Type B DTCs.

Schematic Reference

«Engine Controls Schematics»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-wiring-schematic-diagrams)
«Power Distribution Schematics»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Electrical Center Identification Views»(/chevrolet/malibu/vii-2008-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)
«Probing Electrical Connectors»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__probing-electrical-connectors)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Engine running, command the Engine Controls (EC) Ignition Relay ON and OFF with a scan tool while observing the following EC Ignition Relay control circuit status parameters: Engine Controls Ignition Relay Control Circuit Low Voltage Test Status Engine Controls Ignition Relay Control Circuit Open Test Status Engine Controls Ignition Relay Control Circuit High Voltage Test Status Each parameter should toggle between OK and Not Run or Not Run and OK.
Ignition ON, view the DTC information with a scan tool. DTC P0685 or P0690 should not set.
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note. You must perform the Circuit/System Verification first.

Ignition OFF, disconnect the KR75 powertrain relay.
Ignition ON, verify a test lamp illuminates between both of the following relay battery voltage circuit terminals and ground. Terminal 86 Terminal 87 If the test lamp does not illuminate, test the relay battery voltage circuit for a short to ground or an open/high resistance.
Ignition OFF, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 30 and ground If the test lamp illuminates, test the ignition voltage circuit for a short to voltage.
Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 87 and the relay switch ignition voltage circuit terminal 30.
Ignition ON, observe the scan tool EC Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should display 9-14 V. If the not the specified range, or the ECM does not communicate, test the ignition voltage circuit between the powertrain relay and the ECM for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.
Ignition OFF, verify that a test lamp does not illuminate between the control circuit terminal 85 and B+. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
Connect a DMM set to the diode setting between the control circuit terminal 85 and ground.
Ignition ON, verify the DMM does not display OL. If the DMM displays OL, test the control circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the K20 ECM.
If all circuits test normal, replace the KR75 powertrain relay.

Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay: 70-110 ohms 200-250 ohms If not within the specified range, replace the KR75 powertrain relay.
Test for infinite resistance between the following terminals of the KR75 powertrain relay: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the KR75 powertrain relay.
Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than the specified range, replace the KR75 powertrain relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/chevrolet/malibu/vii-2008-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/malibu/vii-2008-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K20 ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each of the diagnostic category.

The diagnostic trouble code (DTC) indicates that an emission related transmission DTC set in the transmission control module (TCM). The engine control module (ECM) receives the TCM information over the serial data circuit. The ECM turns ON the malfunction indicator lamp (MIL) when the TCM sends a message over the serial data circuit requesting MIL illumination. The DTC information for the ECM will only display DTC P0700, but the Freeze Frame/Failure Records data will display the transmission DTC that set.

The ignition is ON or the engine is operating.
DTC P0700 runs continuously.

The ECM receives a serial data message from the TCM requesting the ECM to turn ON the MIL lamp.

DTC P0700 is a Type A DTC.

Communication codes, U-codes, as well as powertrain codes, P-codes, set in the TCM can cause the TCM to request DTC P0700 to be set in the ECM.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

DTC P0700 is an informational DTC. If there are no engine controls or communication DTCs, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for diagnosis of TCM DTCs.
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance in each bank. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal's frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.

DTCs P0030, P0036, P0050, P0053, P0059, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0128, P0131, P0132, P0133, P0134, P0135, P0151, P0152, P0153, P0154, P0155, P0201-P0206, P0300, P0301-P0306, P0411, P0412, P0418, P0442, P0443, P0446, P0449, P0452, P0453, P0454, P0455, P0496, P1133, P1153, P1516, P2101, P2119, P2120, P2125, P2135, P2138, P2176, P2431, P2432, P2433, P2440, P2A00, P2A03 are not set.
The device control is not active.
The intrusive diagnostics are not active.
The engine overspeed protection is not active.
The power take-off (PTO) is not active.
The traction control is not active.
The fuel control is in air-fuel Closed Loop.
The system voltage is greater than 10 volts, or less than 18 volts.
The engine run time is greater than 50 seconds.
The engine coolant temperature (ECT) is greater than 10°C (50°F).
The engine speed is greater than 1,000 RPM, but less than 4,000 RPM.
The mass air flow is greater than 7 g/s, but less than 400 g/s.

Multiple samples of the pre-catalyst HO2S accumulated voltage are consistently greater than the desired value.

DTCs P1174 and P1175 are Type B DTCs.

The fuel trim cylinder balance diagnostic is very sensitive to heated oxygen sensor (HO2S) design. A non-OE sensor or an incorrect part number may set a false DTC.
Monitoring the misfire current counters, or misfire graph, may help to isolate the cylinder that is causing the condition.

Schematic Reference

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Troubleshooting with a Test Lamp»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Read and record the Freeze Frame/Failure Records data taking note of the speed and load at which the DTC set.
Diagnose any other DTCs that are set. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa. If the MAP sensor parameter is not between 19-42 kPa, refer to «DTC P0106»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0010-to-dtc-p0333) or «DTC P0107 or P0108»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0010-to-dtc-p0333) .
Inspect the air induction system for modified, damaged, leaking, or restricted components.
Inspect the crankcase ventilation system for improper operation.
Inspect the vacuum hoses for splits, kinks, and improper connections.
Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to «Symptoms - Engine Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) .
Test the fuel injectors for improper operation. Refer to «Fuel Injector Diagnosis (w/Tech 2)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-and-diagnosis) or «Fuel Injector Diagnosis (W/CH47976)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-and-diagnosis) .
Test for fuel contamination. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-and-diagnosis) .
Test for excessive fuel in the crankcase due to leaking injectors.
Test the ignition system for improper operation. Refer to «Electronic Ignition System Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-and-diagnosis) .
Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber. Refer to «Symptoms - Engine Mechanical»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verify the repair under the same speed and load as noted in the Freeze Frame/Failure Records data recorded during testing.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model

Engine speed
Spark advance
Throttle position
Engine airflow
Engine coolant temperature
Engine runtime
Park/neutral position
Vehicle speed

The actual model is then compared to the expected exhaust energy model.

The engine is running, and a cold start has been detected.
The vehicle speed is less than 2 km/h (1 mph).
The engine is at idle with no input from the accelerator pedal.
Airflow is greater than 40 mg/cylinder.
DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0354, P0355, P0356, P0501, P0502, P0506, P0507, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.

This DTC runs for 15 seconds within the first 2 minutes of start-up. This diagnostic runs once per trip when a cold start has been determined.

The actual exhaust energy model does not match the expected exhaust energy model.

DTC P1400 is a Type A DTC.

Description and Operation

Engine Control Module Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc. during the first 120 seconds of engine runtime may set this DTC.

Allow the engine to cool.
Start and idle the engine for at least 2 minutes.
DTC P1400 should run and pass.

Inspect the air intake system for the following: Damage, restriction, or modification Dirty or deteriorating air filter element Crankcase ventilation system for correct operation-Refer to «Crankcase Ventilation System Inspection/Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) . Water intrusion Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor Intake manifold leak
Inspect the exhaust system for the following: Water intrusion Exhaust leak Damaged, restricted, modified or enhanced exhaust system-Refer to «Symptoms - Engine Exhaust»(/chevrolet/malibu/vii-2008-2012/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) .
Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to «Symptoms - Engine Mechanical»(/chevrolet/malibu/vii-2008-2012/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
TAC Motor Control Closed	P1516, P2101, P2176	P1516, P2101, P2176	P1516, P2101, P2176	P1516, P2101, P2176
TAC Motor Control Open	P1516, P2101, P2176	P1516, P2101, P2176	P1516, P2101, P2176	P1516, P2101, P2176

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position.

P1516

DTC P0068 or P0121 is not set.
The ignition is in the Run or Crank position.
The ignition voltage is greater than 6.5 V.
The engine is running, or the system is not in the Battery Save mode if the engine is not running.
The DTC runs continuously when the above conditions are met.

P2101

DTC P0068 or P0121 is not set.
The ignition is in the Run or Crank position.
The system voltage is greater than 11 V.
The engine is running or the system is not in Battery Saver mode if the engine is not running.
The DTC runs continuously when the above conditions are set.

P2119

The ignition is in the Unlock/Accessory, Run, or Crank position.
The ignition voltage is greater than 5.23 V.
The system is in the Battery Save mode.
The DTC runs continuously when the above conditions are met.

P2176

The ignition is in the Run or Crank position.
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 is not set.
The system is in the minimum throttle position (TP) learn state.
The throttle is stable for greater than 40 milliseconds.
The DTC runs continuously when the above conditions are met.

The indicated throttle position does not match the predicted throttle position for greater than 0.5 s. OR
The ECM detects a current draw of greater than 9 amps on the motor circuits for greater than 0.18 s.

The indicated throttle position does not match the predicted throttle position for greater than 0.3 s.

The ECM detects that the throttle is unable to return to the default position after it is de-energized for greater than 0.5 s.

The ECM detects that the minimum throttle position was not learned for greater than 1.8 s.

P1516, P2101, and P2176

DTCs P1516, P2101, and P2176 are Type A DTCs.
The control module commands the TAC system to operate in the Reduced Engine Power mode.
A message center or an indicator displays Reduced Engine Power.
Under certain conditions, the control module commands the engine OFF.

DTC P2119 is a Type C DTC.
A message center or an indicator displays Reduced Engine Power.

DTCs P1516, P2101, and P2176 are Type A DTCs.
DTC P2119 is a Type C DTC.

If the Throttle Sweep Test is not available on the scan tool, observe the scan tool TAC Motor parameter while performing the following tests: Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times. The TAC Motor parameter should display Enabled. If Disabled is displayed, continue diagnosis in Circuit/System Testing.
Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close.
A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
A low battery condition may cause a DTC to set.

Schematic Reference

Connector End View Reference

Throttle Actuator Control (TAC) System Description

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the DTC information with a scan tool. DTC P0120, P0122, P0123, P0220, P0222, P0223, P0562, P0621, P0622, or P2135 should not set. If a DTC sets, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
Clear the DTCs with a scan tool. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
Ignition ON, observe the scan tool TAC Motor parameter. The reading should display Enabled.
Observe the DTC information with a scan tool. DTC P1516, P2101, P2119, or P2176 should not set.
Perform the Throttle Sweep Test while observing the TAC Motor parameter with a scan tool. The TAC Motor parameter should display Enabled while the Throttle Sweep Test is in progress. NOTE: Before replacing the throttle body assembly, make sure the throttle control circuits are not shorted to B+. If not the specified value, replace the throttle body assembly.
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Ignition OFF, verify the following conditions do not exist with the throttle body assembly: A throttle blade that is not in the rest position A throttle blade that is binding open or closed A throttle blade that is free to move open or closed without spring pressure If a condition is found, replace the throttle body assembly.
Ignition OFF, disconnect the harness connector at the throttle body assembly.
Ignition ON, verify that a test lamp does not illuminate between each control circuit listed below and ground. TAC Motor Control Closed circuit terminal A TAC Motor Control Open circuit terminal B If test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Ignition ON, verify that a test lamp does not illuminate between each control circuit listed below and B+. TAC Motor Control Closed circuit terminal A TAC Motor Control Open circuit terminal B If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
Ignition OFF, set the DMM to the 40 V scale, select the Min/Max Recording Mode, and set the Peak Min/Max response time to 1 ms.
Ignition OFF, measure the voltage using the DMM Min/Max Recording Mode function on each circuit listed below as the ignition is turned ON. The Max voltage should be within 1 V of B+. TAC Motor Control Closed circuit terminal A TAC Motor Control Open circuit terminal B If not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits and connections test normal, replace the throttle body assembly.

«Throttle Body Assembly Replacement»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Install any components that have been removed or replaced during diagnosis.
Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
Clear the DTCs with a scan tool.
Turn OFF the ignition for 60 seconds.
Perform the Throttle Sweep Test while observing the TAC Motor parameter with a scan tool. The TAC Motor parameter should display Enabled while the Throttle Sweep Test is in progress.
If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
EC Ignition Relay Feedback Signal, Powertrain Relay	P1682	P1682	P0690
Ignition 1 Voltage, Run/Crank Relay	1	1	2
1. A short to ground or open/high resistance will cause a No Crank condition. 2. A short to voltage will cause the engine to continue to run with ignition OFF.

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, engine OFF, and run/crank and powertrain relay are commanded ON
Ignition 1 Voltage, Run/Crank Relay	0 V	0 V	B+
EC Ignition Relay Feedback Signal, Powertrain Relay	0 V	0 V	B+

Ignition 1 Signal

There are 2 ignition voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the engine controls ignition relay or powertrain relay, through a fuse. This ignition voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition voltage circuits, DTC P1682 will set.

The ignition is ON.
System voltage is more than 6 V.
The powertrain relay is commanded ON.
DTC P1682 runs continuously.

The ECM detects that the voltage level difference is greater than 3 V between the 2 ignition voltage circuits for less than 1 s.

DTC P1682 is a Type A DTC.

Schematic Reference

«Engine Controls Schematics»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-36l-wiring-schematic-diagrams)
«Power Distribution Schematics»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-schematic-and-wiring-harness-routing-diagrams)

Connector End View Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Electrical Information Reference

«Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Electrical Center Identification Views»(/chevrolet/malibu/vii-2008-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)
«Probing Electrical Connectors»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__probing-electrical-connectors)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
«Wiring Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Note. On the scan tool, the powertrain relay is referred to as the EC ignition relay.

If DTC P0685 or P0690 is set, diagnose that DTC first.
Ignition ON, observe the scan tool Ignition 1 Voltage signal and the EC Ignition Relay Feedback signal parameters. There should be no more than 3 V difference between the two parameters.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Ignition ON, observe the Ignition 1 Signal and the EC Ignition Relay Feedback scan tool parameter to determine which is more than 3 V lower than the other.
Ignition OFF, remove the relay that corresponds to the scan tool parameter that is more than 3 V lower.
Connect a 20 A fused jumper wire between B+ and the applicable ignition voltage circuit terminal 30. Ignition ON, verify that the applicable scan tool parameter displays between 9-14 V. If the applicable scan tool parameter is less than the specified value, test the ignition voltage circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
Ignition OFF, connect a DMM set to the diode setting between the control circuit terminal 85 and ground. Verify the DMM displays OL. If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
Ignition ON, verify the DMM displays less than 1 V. If not the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If all circuits test normal, replace the applicable relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/chevrolet/malibu/vii-2008-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/malibu/vii-2008-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
«Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/malibu/vii-2008-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
APP Sensor 1 Signal	P2122	P2122	P2123
APP Sensor 1 5-Volt Reference	P0651	P2122	P0651
APP Sensor 1 Low Reference		P2123
APP Sensor 2 Signal	P2127	P2127	P2128
APP Sensor 2 5-Volt Reference	P0452, P0522, P0532, P0641	P2127	P0108, P0522, P0533, P0641
APP Sensor 2 Low Reference		P2128

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: The engine is operating at idle Parameter Normal Range APP Sensor 1: 0.33-4.59 V
5-Volt Reference 1	0 V	0 V	5 V
APP Sensor 1 Signal	0 V	0 V	5 V
APP Sensor 1 Low Reference		4.96 V

APP Sensor 1

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: The engine is operating at idle Parameter Normal Range APP Sensor 2: 0.16-2.30 V
5-Volt Reference 2	0 V	0 V	5 V
APP Sensor 2 Signal	0 V	0 V	5 V
APP Sensor 2 Low Reference		4.92 V

APP Sensor 2

The throttle actuator control (TAC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit.

Two processors are also used to monitor the TAC system data. Both processors are located within the engine control module (ECM). Each signal circuit provides both processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

P2120, P2122, P2123, P2125, P2127, P2128

The system voltage is greater than 5.23 volts.
The ignition is in the Unlock/Accessory, Run, or Crank position.
DTC P0641, P0651, or P0606 is not set.
The DTCs run continuously when the above conditions are met.

P2138

The system voltage is greater than 5.23 volts.
The ignition is in the Unlock/Accessory or Run position.
DTC P0641, P0651, P0606, P2120, P2122, P2123, P2125, P2127, or P2128 is not set.
The DTC runs continuously when the above conditions are met.

P2120

The ECM detects that APP sensor 1 voltage is less than 0.33 volt or greater than 4.59 volts for greater than 0.5 second.

P2122

The ECM detects that APP sensor 1 voltage is less than 0.33 volt for greater than 0.5 second.

P2123

The ECM detects that APP sensor 1 voltage is greater than 4.59 volts for greater than 0.5 second.

P2125

The ECM detects that APP sensor 2 voltage is less than 0.16 volt or greater than 2.30 volts for greater than 0.5 second.

P2127

The ECM detects that APP sensor 2 voltage is less than 0.16 volt for greater than 0.5 second.

P2128

The ECM detects that APP sensor 2 voltage is greater than 2.30 volts for greater than 0.5 second.

The ECM detects that the difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for greater than 0.5 second.

DTCs P2120, P2122, P2123, P2125, P2127, P2128, and P2138 are Type A DTCs.
The ECM commands the TAC system to operate in Reduced Engine Power mode.

DTCs P2120, P2122, P2123, P2125, P2127, P2128, and P2138 are Type A DTCs.

Schematic Reference

Connector End View Reference