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DTC P2432
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 provide an overview of each diagnostic category.
DTC Descriptor
DTC P2432 : Secondary Air Injection (AIR) System Pressure Sensor Circuit Low Voltage
Diagnostic Fault Information
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Pressure Sensor 5-Volt Reference Voltage P2432 P2432 P2431 P2430, P2431
Pressure Sensor Signal P2432 P2432 P2433 P2430, P2431
Pressure Sensor Low Reference -- P2433 -- --
Pump Voltage Supply P0411 P0411 P2444 --
Pump Ground -- P0411 -- --
Solenoid Voltage Supply P0411 P0411 P2440 --
Solenoid Ground -- P0411 -- --
Pump Relay Coil Voltage Supply P0411, P0418 P0411, P0418 -- --
Pump Relay Coil Control P0418, P2444 P0411, P0418 P0418 --
Pump Relay Switch Supply P0411 P0411 -- --
Solenoid Relay Coil Voltage Supply P0411, P0412 P0411, P0412 -- --
Solenoid Relay Coil Control P0412, P2440 P0411, P0412 P0412 --
Solenoid Relay Switch Supply P0411 P0411 -- --
Typical Scan Tool Data
AIR Pressure Sensor
Circuit Normal Range Short to Ground Open Short to Voltage
Operating Conditions: Key ON, Engine OFF
5-Volt Reference Voltage BARO 41 kPa 41 kPa 111 kPa
Pressure Sensor Signal BARO 42 kPa 41 kPa 150 kPa
Low Reference BARO BARO 145 kPa BARO
Circuit/System Description
The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The system forces fresh filtered air into the exhaust stream in order to accelerate the catalyst operation. An electric air pump, the secondary AIR injection pump, provides filtered air on demand to the AIR control solenoid valve/pressure sensor assembly. The AIR control solenoid valve/pressure sensor assembly controls the flow of air from the AIR pump to the exhaust manifold. The AIR valve relay supplies the current needed to operate the AIR control solenoid valve/pressure sensor assembly. A pressure sensor is used to monitor the air flow from the AIR pump. The powertrain control module (PCM) supplies the internal pressure sensor with a 5-volt reference, an electrical ground, and a signal circuit.
The AIR diagnostic uses 3 phases to test the AIR system:
1. DTCs P0411 and P2430 run during Phase 1
2. DTCs P2430 and P2440 run during Phase 2
3. DTC P2444 runs during Phase 3
During phase 1, both the AIR pump and the solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 8-10 kPa above barometric pressure (BARO).
During phase 2, only the AIR pump is activated. The solenoid valve is closed. Pressure sensor performance and solenoid valve deactivation are tested. Expected system pressure is 20-25 kPa above BARO.
During phase 3, neither the AIR pump nor the solenoid valve is activated. AIR pump deactivation is tested. Expected system pressure equals BARO.
In all 3 phases, testing is accomplished by comparing the measured pressure against the expected pressure. The PCM can detect faults in the AIR pump, AIR control solenoid valve/pressure sensor assembly, and the exhaust check valve. The pressure sensor can also detect leaks and restrictions in the secondary AIR system plumbing.
Conditions for Running the DTC
• DTCs P0606, P1635, P1639 are not set.
• The ignition is ON or the engine is running.
• DTC P2432 runs continuously when the above conditions are met.
Conditions for Setting the DTC
The pressure sensor signal is less than 0.2 volt for at least 12.5 seconds.
Action Taken When the DTC Sets
DTC P2432 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P2432 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
• Engine Controls Connector End Views
• Powertrain Control Module Connector End Views
Electrical Information Reference
• Circuit Testing
• Connector Repairs
• Electrical Center Identification Views
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
• Engine Controls Connector End Views
• Powertrain Control Module Connector End Views
Electrical Information Reference
• Circuit Testing
• Connector Repairs
• Electrical Center Identification Views
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
• Scan Tool Data Definitions
• Scan Tool Data List
• Scan Tool Output Controls
Circuit/System Verification
4. Ignition ON, verify that the AIR pump is not activated.
5. Ignition ON, observe that the AIR Pressure Sensor parameter approximately equals the BARO parameter.
⇒ If not equal, verify that the BARO parameter reading is correct for your altitude. Refer to Altitude Versus Barometric Pressure . If the reading is not correct for your altitude, diagnose the MAP sensor. Refer to DTC P0106 . If the BARO parameter is correct for your altitude, proceed with Circuit/System Testing.
6. Engine running, enable the AIR solenoid with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 8-10 kPa above BARO.
⇒ If less than the specified range, verify that the AIR pump is activating. If AIR pump activation is normal, proceed with Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the AIR solenoid valve.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal 1 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.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 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.
4. Verify the scan tool AIR Pressure Sensor parameter is less than 0.5 volts.
⇒ If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the control module.
5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 3. Verify the scan tool AIR Pressure Sensor parameter is greater than 4.9 volts.
⇒ 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 control module.
6. If the ECM and circuits test normal, replace the AIR solenoid valve.
7. Ignition ON, engine OFF, observe the AIR Pressure Sensor parameter.
⇒ If the AIR Pressure Sensor parameter does not equal the BARO parameter, replace the AIR solenoid valve.
Component Testing
Solenoid Valve
Apply fused battery voltage and ground to the solenoid and verify that the valve opens and closes completely as voltage is applied to and removed from the solenoid. Observe that the valve is not obstructed or leaking.
⇒ If the valve operates incorrectly, leaks, or is obstructed, remove the obstruction or replace the valve.
Repair Instructions
• Secondary Air Injection Pump Hose Replacement
• Secondary Air Injection Pump Replacement
• Secondary Air Injection Solenoid Valve Replacement
• Control Module References for control module replacement, setup and programming
Repair Verification
With the engine running, enable the AIR pump with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 20-25 kPa above BARO