What are the probable causes of DTC P0412? - 2009 Saturn Aura XE

Ull need to scanit w a factorytool at a privateshop. It reads a datastream to pinpoint issues. Those portabl readers are general. Dont just replaceparts n hope. Oldercars can hav worn wireharness causin weird problms too. Unplug computer n cleanpins..dirt is common in aging vehicles creating issues. Since its jyst an emmission thing udont need to worry its runnin too lean or sumthin crucial

Please go to the link provided and just input the code for definition and possible causes. Keep in mind a fault code doesn't mean a particular part is defective, it only indicates that a problem in that circuit or the signal given is not correct for the values seen by other sensors. Diagnostic Trouble Codes for OBD II

The solid state relay (Figure 124) switches the high current required for operation of the electric AIR pump. Input control to the solid state relay comes from the powertrain control module (PCM).
HM1 DTC P0412: CHECK B+ VOLTAGE TO SOLID STATE RELAY

• Disconnect SSR.
• Key on, engine off.
• Measure voltage of B+ circuit at SSR harness connector and battery negative post
• Fuse # F1.11 15 amp Auxiliary fuse box -underhood

code p0412 refers to secondary air injection (AIR) solenoid A---circuit malfunction===causes wiring---air solenoid---ECM
replace the AIR solenoid.

Hello Please read this carefully. This info directly relates to the code you are having. I will include a troubleshooting tree at the bottom. If there are any other codes or if you need further info please let me know:

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 AIR 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:

• DTCs P0411 and P2430 run during Phase 1
• DTCs P2430 and P2440 run during Phase 2
• DTC P2444 runs during Phase 3

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.

The DTC P2444 Secondary Air Injection (AIR) Pump is Stuck ON diagnostic monitors the system pressure signal during test phase 3. When the PCM determines the AIR pressure sensor signal is higher than expected, DTC P2444 sets.

DTC DESCRIPTOR
This diagnostic supports the following DTC:

• DTC P2444 Secondary Air Injection (AIR) System Pump Stuck On

CONDITIONS FOR RUNNING THE DTC

• DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0350, P0411, P0412, P0418, P0420, P0606, P0641, P0651, P1350, P2430, P2431, P2432, P2433, P2440 are not set.
• The system voltage is between 10-18 volts .
• The engine is running.
• The start-up engine coolant temperature (ECT) parameter is between 5-50°C (41-122°F) .
• The start-up intake air temperature (IAT) parameter is between 5-60°C (41-140°F) .
• The BARO parameter is more than 60 kPa .
• The MAF sensor parameter is between 3-24 g/s .
• DTC P2444 runs once per trip start-up when the above conditions are met and the AIR pump operation is requested.

CONDITIONS FOR SETTING THE DTC
The measured AIR pressure is more than expected during AIR pump Phase 3 operation. DTC P2444 sets within 5 seconds when the above conditions are met.

ACTION TAKEN WHEN THE DTC SETS

• The PCM illuminates the malfunction indicator lamp (MIL) during the first key cycle in which the diagnostic trouble code (DTC) sets.
• The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Freeze Frame buffer.

CONDITIONS FOR CLEARING THE MIL/DTC

• The PCM turns OFF the MIL on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
• A DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.
• A DTC can be cleared by using the scan tool Clear Information function.

DIAGNOSTIC AIDS

Inspect for any of the following conditions:

• The resistance of the AIR pump relay coil (across terminal 85 and terminal 86) is 50-70 ohms at 20°C (68°F) . In the normal unenergized state, the resistance of the open relay contacts (across terminal 30 and terminal 87) is infinite.
• The AIR pump relays electrical contacts may be pitted and sticking. Replace the relay if tapping gently on the relay or wiggling the relay causes a change in the relays operation.
• The performance of the AIR pump relay may be affected by temperature. Check the relay after sitting outside overnight and after running the engine 30 minutes .
• An intermittent malfunction may be caused by a fault in an AIR system electrical circuit. Inspect the wiring harness and components for an intermittent condition.

The numbers below refer to the step numbers on the diagnostic table.

1. This step tests for the correct operation of the AIR pump. When the AIR pump relay is commanded ON with the scan tool, only the AIR pump relay is energized. When the AIR valve relay is commanded ON with the scan tool, both the AIR pump and the AIR valve relays are energized.
2. This step tests for the correct operation of the AIR pump relay.

I'm going to post the description from engine-codes.com since it is a big paragraph. You will need a shop manual or else take it to a repair shop that has the equipment and book to check it out.

P0412 TOYOTA Description
An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.
The DTC P0412 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.
Read more: http://engine-codes.com/p0412_toyota.html#ixzz2Y7OQTCbb

P0412 - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

Possible causes- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection

P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction

Possible Causes

Short to power or ground in the AIR command circuit.

Open in the AIR command circuit.

AIR bypass solenoid fault.

AIR relay fault.

Damaged PCM.

P0412 Pulsed secondary air injection solenoid circuit, with seeing it and what it is doing i would guess replace the secondary air injection solenoid control valve.