P2435
DTC P2435-P2438
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P2435
- Secondary Air Injection (AIR) System Pressure Sensor Stuck in Range Bank 2
DTC P2436
- Secondary Air Injection (AIR) System Pressure Sensor Performance Bank 2
DTC P2437
- Secondary Air Injection (AIR) System Pressure Sensor Circuit Low Voltage Bank 2
DTC P2438
- Secondary Air Injection (AIR) System Pressure Sensor Circuit High Voltage Bank 2
Diagnostic Fault Information
Typical Scan Tool Data
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.
Conditions for Running the DTC
DTC P2435
* DTCs P0412, P0418, P0606, P2432, P2433, P2437, or P2438 are not set.
* Greater than 120 min has elapsed since the last cold start.
* The start-up intake air temperature (IAT) is between 5-60°C (41-140°F).
* The start-up engine coolant temperature (ECT) is between 5-50°C (41-122°F).
* DTC P2435 runs continuously when the above conditions are met.
DTC P2436
* DTCs P0107, P0108, P0412, P0418, P0606, P0641, P0651, P2432, P2433, P2437, or P2438 are not set.
* The ignition is ON.
* DTC P2436 runs continuously when the above conditions are met.
P2437 and P2438
* DTCs P0606, P0641, or P0651 are not set.
* The ignition is ON, or the engine is operating.
* DTC P2432 and P2433 run continuously when the above conditions are met.
Conditions for Setting the DTC
P2435
* The ECM determines that the pressure sensor value change is less than a calibrated value.
* DTC P2430 sets within 8 seconds when the above condition is met.
P2436
* 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
* 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.
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
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Secondary Air Injection System Description Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning 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 P0641 for further diagnosis.
2. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure 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 P0106 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.
Circuit/System Testing
Note: The Secondary Air Pressure sensor is an integral part of the Secondary Air Check Valve.
1. Ignition OFF for 1 minute, disconnect the harness connector at the Secondary Air Injection Pressure Sensor.
2. Test for less than 5 ohm 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 Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Secondary Air Injection Shutoff and Check Valve Replacement (Bank 1) Secondary Air Injection Shutoff and Check Valve Replacement (Bank 1)Secondary Air Injection Shutoff and Check Valve Replacement (Bank 2) Secondary Air Injection Shutoff and Check Valve Replacement (Bank 2)
* Control Module References Programming and Relearning for Engine Control Module replacement, setup, and programming