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DTC P2431-P2433

DTC P2431-P2433

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P2431

Secondary Air Injection System Pressure Sensor Performance

DTC P2432

Secondary Air Injection System Pressure Sensor Circuit Low Voltage

DTC P2433

Secondary Air Injection System Pressure Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
5 V Reference P0237, P0452, P0522, P0642, P159F, P2432 P0522, P2432 P0236, P0643, P15A0, P2433* P2431
Secondary Air Injection Pressure Sensor Signal P2432 P2432 P2433* P2431
Low Reference - P2433 - P2431
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.


Circuit/System Description

The secondary air injection 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 secondary air injection pump. The engine control module (ECM) supplies voltage to the 5 V reference circuit and provides a ground for the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.

Conditions for Running the DTC


P2431

• DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P050C, P2227, P2228, or P2229 is not set.

• The secondary air injection system has been commanded ON and OFF during the ignition cycle.

• Battery voltage is between 10-18 V.

• Engine speed is 680-3,500 RPM.

• Intake air temperature is between -12 to +80°C (10.4-176°F).

• Engine coolant temperature is between -10.5 to +69.8°C (13-158°F).

• Mass airflow is less than 100 g/s.

• Catalyst heating is active.

• Current altitude is less than 3,000 m (9,843 ft).

• The difference between intake air temp and engine coolant start temp is less than 15°C (59°F).

• The DTC runs once per ignition cycle when the above conditions exist.



P2432 or P2433

• The ignition is ON, or the engine is operating.

• The DTCs run continuously when the above condition exists for greater than 1 s.


Conditions for Setting the DTC


P2431

• The ECM detects that the secondary air injection pressure sensor is 5 kPa (0.7 psi) less than the BARO sensor when the secondary air injection pump is commanded ON.

OR

• The ECM detects that the secondary air injection pressure sensor is 5 kPa (0.7 psi) greater than the BARO sensor when the secondary air injection pump is commanded OFF.


P2432

The ECM detects that the secondary air injection pressure sensor signal is less than 0.5 V for greater than 1 s.

P2433

The ECM detects that the secondary air injection pressure sensor signal is greater than 4.5 V for greater than 1 s.

Action Taken When the DTC Sets

DTCs P2431, P2432 and P2433 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2431, P2432 and P2433 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Description and Operation

Secondary Air Injection System Description

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0641, P0642, P0643, P2227, P2228, or P2229 is not set.

2. If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

3. Observe the scan tool Secondary Air Injection Pressure Sensor voltage parameter. The reading should be between 1.0-4.0 V.

4. Compare the scan tool Atmospheric pressure parameter to the table Altitude versus barometric pressure The BARO should be within the specified range displayed in the table for the specific altitude above sea level.

5. If not within the specified range, refer to DTC P2227, P2228, or P2229 (LAU) for further diagnosis.

6. 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, disconnect the harness connector at the B157 secondary air injection pressure sensor.

2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

5. 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 K20 ECM.

6. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

7. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is less than 0.5 V.

8. If greater than the specified range, test the signal circuit's pin 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

9. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is greater than 4.8 V.

10. 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 K20 ECM.

11. If all circuits test normal, test or replace the B157 secondary air injection pressure sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Secondary Injection Shutoff Valve Pressure Sensor Replacement

• Control Module References for ECM replacement, setup, and programming