• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Pressure Sensor 5-Volt Reference Voltage | P0641, P2432 | P2432 | P0641, P2431 | P2430, P2431 |
Pressure Sensor Signal | P2432 | P2432 | P2433 | P2430, P2431 |
Pressure Sensor Low Reference | -- | P2433 | -- | -- |
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
---|---|---|---|---|
Operating Conditions: Ignition ON, Engine OFF Parameter Normal Range: BARO | ||||
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 |
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. The secondary AIR injection pump provides filtered air on demand to the AIR solenoid check valve assembly. The AIR solenoid valve 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 pump. The AIR solenoid valve assembly has an integral check valve, pressure sensor, and solenoid. The pressure sensor monitors the air flow from the AIR pump. The engine control module (ECM) supplies the internal pressure sensor with a 5-volt reference, a low reference, and signal circuits. The signal circuit provides the control module with a voltage relative to internal AIR pressure changes.
The AIR diagnostic uses 3 phases to test the AIR system:
During phase 1, both the AIR pump and the solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 7-10 kPa 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 15-20 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 ECM can detect faults in the AIR pump, AIR control solenoid valve/pressure sensor assembly, and the exhaust check valve. The ECM can also detect leaks and restrictions in the secondary AIR system plumbing.
• | DTCs P0412, P0418, P0606, P2432, P2433 are not set. |
• | The engine has been OFF for greater than 120 minutes since the last cold start. |
• | The AIR pump is commanded ON. |
• | The start-up engine coolant temperature (ECT) is between 5-50°C (41-122°F). |
• | The start-up intake air temperature (IAT) is between 5-60°C (41-140°F). |
• | DTC P2430 runs continuously when the above conditions are met. |
• | DTCs P0107, P0108, P0412, P0418, P0606, P0641, P0651, P2432, P2433 are not set. |
• | The ignition is ON. |
• | DTC P2431 runs continuously when the above conditions are met. |
• | DTCs P0606, P0641, P0651 are not set. |
• | The ignition is ON or the engine is running. |
• | DTC P2432 and P2433 run continuously when the above conditions are met. |
• | The ECM determines that the pressure sensor value change is less than a calibrated value while the AIR pump is commanded ON during phase 1 or 2. |
• | DTC P2430 sets within 8 seconds when the above condition is met. |
• | The ECM determines that the difference between the AIR pressure sensor and the barometric pressure (BARO) sensor signals is greater than 10 kPa 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. |
The ECM determines that the AIR pressure sensor signal is less than 0.2 volt for at least 12.5 seconds.
The ECM determines that the AIR pressure sensor signal is equal to or greater than 4.75 volts for at least 12.5 seconds.
DTCs P2430, P2431, P2432, and P2433 are Type B DTCs.
DTCs P2430, P2431, P2432, and P2433 are Type B DTCs.
Secondary Air Injection System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If not the specified range, verify that the BARO parameter is correct for your altitude. Refer to Altitude Versus Barometric Pressure. If the BARO parameter is not correct for your altitude, refer to DTC P0106. |
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | 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 ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | 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. |
⇒ | 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 ECM. |
• | Control Module References for replacement, setup, and programming |