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Engine Controls and Fuel - 3.5l - p2430 to DTC p2544 Chevrolet Malibu VII

Testing & Diagnostics ~4069 words

Diagnostic Instructions

  1. 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.
  2. 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.
  3. «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.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP0651, P2432P2432P0651, P2433P2430, P2431
AIR Pressure Sensor SignalP2432P2432P2433P2430, P2431
Low ReferenceP2433P2430, P2431

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: BARO Operating Conditions: Ignition ON, Engine OFF
5-Volt Reference41 kPa41 kPa149 kPa
AIR Pressure Sensor Signal40 kPa40 kPa149 kPa
Low Reference149 kPa

AIR Pressure Sensor

Circuit/System Description

The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. A secondary air injection pressure sensor is used to monitor the air flow from the AIR pump for each engine bank. The Engine Control Module (ECM) supplies 5 V to the 5 V reference circuit and supplies a ground to the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the AIR system.

DTC P2430

  1. DTCs P0412, P0418, P0606, P2432, P2433, P2437, or P2438 are not set.
  2. Greater than 120 min has elapsed since the last cold start.
  3. The start-up intake air temperature (IAT) is between 5-60°C (41-140°F).
  4. The start-up engine coolant temperature (ECT) is between 5-50°C (41-122°F).
  5. DTC P2430 runs continuously when the above conditions are met.

DTC P2431

  1. DTCs P0107, P0108, P0412, P0418, P0606, P0641, P0651, P2432, P2433, P2437, or P2438 are not set.
  2. The ignition is ON.
  3. DTC P2431 runs continuously when the above conditions are met.

P2432 and P2433

  1. DTCs P0606, P0641, or P0651 are not set.
  2. The ignition is ON, or the engine is operating.
  3. DTC P2432 and P2433 run continuously when the above conditions are met.
  1. The ECM determines that the pressure sensor value change is less than a calibrated value.
  2. DTC P2430 sets within 8 seconds when the above condition is met.

P2431

  1. The ECM determines that the AIR pressure sensor is 10 kPa less than the BARO sensor signal when the AIR pump is commanded OFF. OR
  2. The ECM determines that the difference between the AIR pressure sensor and the BARO sensor signals is greater than 50 kPa when the AIR pump is commanded ON.

DTC P2432

The Secondary Air Pressure sensor signal is less than 0.2 V for at greater than 12 seconds.

DTC P2433

The Secondary Air Pressure sensor signal is greater than 4.8 V for greater than 12 seconds.

Action Taken When the DTC Sets

DTCs P2430, P2431, P2432 and P2433 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2430, P2431, P2432 and P2433 are Type B DTCs.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «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

  1. Ignition ON, observe the diagnostic trouble code (DTC) information with a scan tool. Verify that DTC P0651 is not set. If DTC P0651 is set, refer to «DTC P0641 or P0651»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-dtc-p0335-to-dtc-p2138) for further diagnosis.
  2. Compare the scan tool BARO pressure parameter to the «Altitude Versus Barometric Pressure»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-specifications__altitude-versus-barometric-pressure) table. The BARO should be within the specified range displayed in the table for the specific altitude. If not within the specified range, refer to «DTC P0106»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-dtc-p0010-to-dtc-p0333) for further diagnosis.
  3. Compare the scan tool AIR Press Sen Bn 1 parameter to the BARO reading. The readings should be within 3 kPa.
  4. Engine idling, command the Air Pump Relay ON with a scan tool while observing the AIR Press Sen Bn 1 parameter. The sensor reading should change greater than 16 kPa.
  5. 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.

Circuit/System Testing

  1. Ignition OFF for 1 minute, disconnect the harness connector at the Secondary Air Injection Pressure Sensor.
  2. Test for less than 5 ohms between the low reference circuit terminal 3 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 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. 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.
  4. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is less than 0.5 V. If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 3. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is greater than 4.8 V. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Disconnect the Air hose/pipe from the Air Solenoid.
  7. Ignition ON, command the Air Pump ON with a scan tool. Verify airflow to the Air Solenoid. If there is limited or no airflow to the Air Solenoid, inspect for the following: Hoses/pipes for a restriction or blockage Hoses/pipes for being disconnected The Air Pump ground circuit for high resistance The Air Pump ignition voltage circuit for high resistance If a condition is located, repair as necessary. If a condition is not located, and the AIR pump operates with limited or no flow, replace the Secondary Air Injection Pump.
  8. If all circuits test normal, test or replace the Secondary Air Injection Pressure sensor.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Secondary Air Injection Shutoff and Check Valve Replacement (Bank 2)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions) or «Secondary Air Injection Shutoff and Check Valve Replacement (Bank 1)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
  2. «Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, setup, and programming
  1. 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.
  2. 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.
  3. «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.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP0651, P2437P2437P0651, P2436P2435, P2436
AIR Pressure Sensor SignalP2437P2437P2438P2435, P2436
Low ReferenceP2438P2435, P2436
CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: BARO Operating Conditions: Ignition ON, Engine OFF
5-Volt Reference41 kPa41 kPa149 kPa
AIR Pressure Sensor Signal40 kPa40 kPa149 kPa
Low Reference149 kPa

AIR Pressure Sensor

The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. A secondary air injection pressure sensor is used to monitor the air flow from the AIR pump for each engine bank. The Engine Control Module (ECM) supplies 5 V to the 5 V reference circuit and supplies a ground to the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the AIR system.

DTC P2435

  1. DTCs P0412, P0418, P0606, P2432, P2433, P2437, or P2438 are not set.
  2. Greater than 120 min has elapsed since the last cold start.
  3. The start-up intake air temperature (IAT) is between 5-60°C (41-140°F).
  4. The start-up engine coolant temperature (ECT) is between 5-50°C (41-122°F).
  5. DTC P2435 runs continuously when the above conditions are met.

DTC P2436

  1. DTCs P0107, P0108, P0412, P0418, P0606, P0641, P0651, P2432, P2433, P2437, or P2438 are not set.
  2. The ignition is ON.
  3. DTC P2436 runs continuously when the above conditions are met.

P2437 and P2438

  1. DTCs P0606, P0641, or P0651 are not set.
  2. The ignition is ON, or the engine is operating.
  3. DTC P2432 and P2433 run continuously when the above conditions are met.

P2435

  1. The ECM determines that the pressure sensor value change is less than a calibrated value.
  2. DTC P2430 sets within 8 seconds when the above condition is met.

P2436

  1. The ECM determines that the AIR pressure sensor is 10 kPa less than the BARO sensor signal when the AIR pump is commanded OFF. OR
  2. The ECM determines that the difference between the AIR pressure sensor and the BARO sensor signals is greater than 50 kPa when the AIR pump is commanded ON.

DTC P2437

The Secondary Air Pressure sensor signal is less than 0.2 V for at greater than 12 seconds.

DTC P2438

The Secondary Air Pressure sensor signal is greater than 4.8 V for greater than 12 seconds.

DTCs P2430, P2431, P2432 and P2433 are Type B DTCs.

DTCs P2430, P2431, P2432 and P2433 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «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

  1. Ignition ON, observe the diagnostic trouble code (DTC) information with a scan tool. Verify that DTC P0651 is not set. If DTC P0651 is set, refer to «DTC P0641 or P0651»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-dtc-p0335-to-dtc-p2138) for further diagnosis.
  2. Compare the scan tool BARO pressure parameter to the «Altitude Versus Barometric Pressure»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-24l-specifications__altitude-versus-barometric-pressure) table. The BARO should be within the specified range displayed in the table for the specific altitude. If not within the specified range, refer to «DTC P0106»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-dtc-p0010-to-dtc-p0333) for further diagnosis.
  3. Compare the scan tool AIR Press Sen Bn 2 parameter to the BARO reading. The readings should be within 3 kPa.
  4. Engine idling, command the Air Pump Relay ON with a scan tool while observing the AIR Press Sen Bn 2 parameter. The sensor reading should change greater than 16 kPa.
  5. 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.
  1. Ignition OFF for 1 minute, disconnect the harness connector at the Secondary Air Injection Pressure Sensor.
  2. Test for less than 5 ohms between the low reference circuit terminal 3 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 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. 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.
  4. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is less than 0.5 V. If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 3. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is greater than 4.8 V. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Disconnect the Air hose/pipe from the Air Solenoid.
  7. Ignition ON, command the Air Pump ON with a scan tool. Verify airflow to the Air Solenoid. If there is limited or no airflow to the Air Solenoid, inspect for the following: Hoses/pipes for a restriction or blockage Hoses/pipes for being disconnected The Air Pump ground circuit for high resistance The Air Pump ignition voltage circuit for high resistance If a condition is located, repair as necessary. If a condition is not located, and the AIR pump operates with limited or no flow, replace the Secondary Air Injection Pump.
  8. If all circuits test normal, test or replace the Secondary Air Injection Pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Secondary Air Injection Shutoff and Check Valve Replacement (Bank 2)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions) or «Secondary Air Injection Shutoff and Check Valve Replacement (Bank 1)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
  2. «Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, setup, and programming
  1. 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.
  2. 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.
  3. «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.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Air Solenoid Relay Coil Ignition SupplyP0411, P0412P0411, P0412
Air Solenoid Relay Coil ControlP0412, P2440P0411, P0412P0412
AIR Solenoid Relay Controlled OutputP0411P0411P2440
AIR Solenoid GroundP0411

The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. Ignition voltage is supplied directly to the secondary air injection pump relay and secondary air solenoid valve relay. The Engine Control Module (ECM) controls the relays by grounding the control circuit with a solid state device called a driver. The ECM monitors the control circuits for open, short to ground, or shorted to a voltage condition.

Conditions for Running the DTC

  1. DTC P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0201-P0206, P0300-P0306, P0411, P0412, P0418, P0420, P0606, P0641, P0651, P2430, P2431, P2432, P2433, P2435, P2436, P2437, or P2438 are not set.
  2. Greater than 120 min has elapsed since the last cold start.
  3. The ignition voltage is between 9-18 V.
  4. The barometric pressure (BARO) is greater than 70 kPa.
  5. The mass air flow (MAF) sensor is 3-24 g/s.
  6. The startup engine coolant temperature (ECT) is between 5-60°C (41-140°F).
  7. The startup intake air temperature (IAT) is between 5-50°C (41-122°F).
  8. The AIR system is commanded ON.
  9. The DTCs run continuously once the above conditions are met for greater than 5 seconds.

Conditions for Setting the DTC

The ECM detects that difference between the predicted system pressure and the actual system pressure is greater than 3 kPa for greater than 8 seconds.

DTC P2440 is a Type B DTC.

DTC P2440 is a Type B DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «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

  1. Ignition ON, compare the scan tool AIR Press Sen Bn 1 and AIR Press Sen Bn 2 parameters to the BARO reading. The readings should be within 3 kPa. If greater than the specified range, refer to «DTC P2430-P2433»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-p2430-to-dtc-p2544) or «DTC P2435-P2438»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-p2430-to-dtc-p2544) .
  2. Command the Secondary Air Solenoid Relay ON and OFF with a scan tool. You should hear an audible click as the relay is commanded ON and OFF. If the relay does not respond to the scan tool commands, refer to «DTC P0412 or P0418»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-dtc-p0335-to-dtc-p2138) .
  3. Command the Air Solenoid Relay ON and OFF with a scan tool. Listen or feel for Air Solenoid operation. Both Air Solenoids should respond to the scan tool commands. Repeat as necessary in order to verify Air Solenoid operation.
  4. 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.
  1. Ignition OFF, disconnect the harness connector at the appropriate Secondary Air Solenoid.
  2. Test for less than 5 ohms between the ground circuit terminal 4 and ground. If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Connect a test lamp between the Air Solenoid ignition voltage circuit terminal 5 and ground.
  4. Ignition ON, command the Air Solenoid ON and OFF with a scan tool. The test lamp should respond to the scan tool commands. If the test lamp is always OFF, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the Air Solenoid relay. If the test lamp is always ON, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the Air Solenoid relay.
  5. Disconnect the Air hose/pipe from the Air Solenoid.
  6. Ignition ON, command the Air Pump ON with a scan tool. Verify airflow to the Air Solenoid. If there is limited or no airflow to the Air Solenoid, inspect for the following: Hoses/pipes for a restriction or blockage Hoses/pipes for being disconnected The Air Pump ground circuit for high resistance The Air Pump ignition voltage circuit for high resistance If a condition is located, repair as necessary. If a condition is not located, and the AIR pump operates with no pressure change, replace the Secondary Air Injection Pump.
  7. If all circuits test normal, test or replace the Air Solenoid.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the Air Solenoid.
  2. Test for 8-15 ohms between Air Solenoid terminals 4 and 5. If not within the specified range, replace the Air Solenoid.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «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)
  2. «Secondary Air Injection Shutoff and Check Valve Replacement (Bank 2)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions) or «Secondary Air Injection Shutoff and Check Valve Replacement (Bank 1)»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
  3. «Control Module References»(/chevrolet/malibu/vii-2008-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, setup, and programming
  1. 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.
  2. 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.
  3. «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.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
AIR Pump Relay Coil Voltage SupplyP0411, P0418P0411, P0418
AIR Pump Relay Switch Voltage SupplyP0411P0411
AIR Pump Voltage SupplyP0411P0411P2444
AIR Pump Relay ControlP0418, P2444P0411, P0418P0418
AIR Pump GroundP0411

The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. Ignition voltage is supplied directly to the secondary air injection pump relay and secondary air solenoid valve relay. The Engine Control Module (ECM) controls the relays by grounding the control circuit with a solid state device called a driver. The ECM monitors the control circuits for open, short to ground, or shorted to a voltage condition.

  1. DTC P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0201-P0206, P0300-P0306, P0411, P0412, P0418, P0420, P0606, P0641, P0651, P2430, P2431, P2432, P2433, P2435, P2436, P2437, or P2438 are not set.
  2. Greater than 120 min has elapsed since the last cold start.
  3. The ignition voltage is between 9-18 V.
  4. The barometric pressure (BARO) is greater than 70 kPa.
  5. The mass air flow (MAF) is less than 33 g/s.
  6. The startup engine coolant temperature (ECT) is between 5-50°C (41-122°F).
  7. The startup intake air temperature (IAT) is between 5-60°C (41-140°F).
  8. The AIR system is commanded ON.
  9. The DTC runs once per ignition cycle when the above conditions are met for greater than 5 seconds.

The ECM detects that the difference between the predicted system pressure and the actual system pressure is greater than 3 kPa for greater than 5 seconds.

DTC P2444 is a Type A DTC.

DTC P2444 is a Type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/malibu/vii-2008-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «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

  1. Ignition ON, compare the scan tool AIR Press Sen Bn 1 and AIR Press Sen Bn 2 parameters to the BARO reading. The readings should be within 3 kPa. If greater than the specified range, refer to «DTC P2430-P2433»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-p2430-to-dtc-p2544) or «DTC P2435-P2438»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-p2430-to-dtc-p2544) .
  2. Command the Secondary Air Pump Relay ON and OFF with a scan tool. You should hear an audible click as the relay is commanded ON and OFF. If the relay does not respond to the scan tool commands, refer to «DTC P0412 or P0418»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-dtc-p0335-to-dtc-p2138) .
  3. Command the Air Solenoid Relay ON and OFF with a scan tool. Listen or feel for Air Solenoid operation. Both Air Solenoids should respond to the scan tool commands. Repeat as necessary in order to verify Air Solenoid operation. If either Air Solenoid does not respond to the scan tool commands, refer to «DTC P2440»(/chevrolet/malibu/vii-2008-2012/remont/testing-diagnostics/#engine-controls-and-fuel-35l-p2430-to-dtc-p2544) .
  4. Ignition ON, command the Air Pump Relay ON and OFF with a scan tool. The Air Pump should respond to the scan tool commands.
  5. 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.
  1. Ignition OFF, disconnect the harness connector at the Secondary Air Pump.
  2. Ignition ON, verify that a test lamp does not illuminate between the Air Pump ignition voltage circuit terminal A and ground. If the test lamp illuminates, test the ignition circuit for a short to voltage.
  3. If the circuit tests normal replace the Air Pump Relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. 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.
  2. 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.
  3. «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.

To improve shift feel, the transmission control module (TCM) may request that the engine control module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.

The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P2544 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P2544.

When the TCM receives a torque reduction failure message from the ECM, then DTC P2544 will set. DTC P2544 is a type B DTC.

  1. The engine run time is greater than 5 seconds.
  2. No other CAN errors are present.

The ECM notifies the TCM that a torque reduction request has failed for 2 seconds.

  1. DTC P2544 is a Type B DTC.
  2. The TCM commands maximum line pressure.
  3. The TCM freezes transmission adaptive functions.
  4. At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
  5. At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
  6. The TCM stores DTC P2544 in TCM history.
  1. DTC P2544 is a Type B DTC.
  2. The ECM turns OFF the malfunction indicator lamp (MIL) after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request.
  3. A scan tool can clear the DTC.
  4. The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
  5. The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.

Diagnostic Aids

This DTC may set due to low system voltage. Ensure that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test . Verify the charging system is operating correctly. Refer to Charging System Test . Verify there is no parasitic drain on the battery. Refer to Battery Electrical Drain/Parasitic Load Test .

DTC Type Reference

Observe the DTCs with the scan tool.

  1. If DTC P0604 is set, replace the ECM.
  2. If DTC P0604 is not set, replace the TCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM or TCM replacement, setup, and programming

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