SAIS Failure and Trouble Codes

A failure of any component of the SAIS will generally set the check engine light (CEL) and cause the Engine Control Module (ECM)
to store trouble codes. Many of these mechanical failures will also cause the vehicle to enter “limp-mode” where throttle
response is limited to 50% to protect the engine from damage. Before installing the bypass module it is highly recommended to
address any codes not related to the SAIS. The codes below are the most common trouble codes that the bypass kit is able to let
you clear once the kit is installed and the codes are initially reset. Many of these codes can be caused by a failing SAIS Air Pump
which can also cause a loud vacuum cleaner noise for 20-30 seconds after a cold start. After the kit is installed the system is
prevented from operating and the below codes should not come back on, set the CEL or let the vehicle enter into “Limp Mode”

In general, the SAIS Bypass Kit cannot clear codes that are related to electrical faults or circuit malfunctions with the exceptions
of a few below and only under certain circumstances with the addition of a Pump Replacement Pack or a Pressure Sensor Jumper Harness to the bypass kit.

These are the codes the bypass kits (V36W, V36H or V52H) can take care of by themselves.

P1441 - Switching Valve No.2 Stuck Open Bank 1
P1442 - Switching Valve No.2 Stuck Close Bank 1
P1444 - Switching Valve No.2 Stuck Open Bank 2
P1445 - Switching Valve No.2 Stuck Close Bank 2
P2440 - Switching Valve Stuck Open Bank 1
P2441 - Switching Valve Stuck Closed Bank 1
P2442 - Switching Valve Stuck Open Bank 2
P2443 - Switching Valve Stuck Closed Bank 2
P2445 - Pump Stuck OFF Bank 1
* Important cold weather note, see below in red.
P2447 - Pump Stuck Off Bank 2
There is an occasional exception like having a blown air pump fuse or damaged air pressure sensors that will need to be addressed at the same time so the bypass module will work.

Codes the kits can take care of with the addition of a Pressure Sensor Replacement Harness(PSRH)

P2431 - Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2432 - Air Flow / Pressure Sensor Circuit Low Bank 1
P2433 - Air Flow / Pressure Sensor Circuit High Bank 1
P2436 - Air Flow / Pressure Sensor Circuit Range / Performance Bank 2
P2437 - Air Flow / Pressure Sensor Circuit Low Bank 2
P2438 - Air Flow / Pressure Sensor Circuit High Bank 2
P106B - Pressure Sensor Correlation / Evap. Pressure Sensor

A damaged pressure sensor is usually caused by an Air Switching Valve stuck open for a long period of time. If you are getting a trouble code for Bank 1 and Bank 2, you will need to purchase two PSRH.

Codes the kits can take care of with the addition of one or two Pump Replacement Packs(PRP)

P0418 - SAIS Circuit/Relay 'A' Circuit Malfunction Bank 1
P0419 - SAIS Circuit/Relay 'A' Circuit Malfunction Bank 2

Usually caused by an open or short circuit in one of the air pump motor windings. One pack is needed for each code.

Codes the kits can take care of with the addition of one or two Valve Replacement Packs (VRP)

P0412 - SAIS Switching Valve 'A' Circuit Malfunction Bank 1
P0415 - SAIS Switching Valve 'A' Circuit Malfunction Bank 2

Usually caused by an open circuit of the solenoid coil in one of the Air Switching Valves. A = Bank1 ASV Solenoid B = Bank2 ASV Solenoid. One pack is needed for each code.





Explanations, Exceptions and Other Codes


C1201 - Engine Control System Malfunction
This is the code we call "the limp mode code". This is the code that indicates your VSC, TRAC and other safety systems have been turned off and you are in limp home mode. Not all scanners can read the C codes but if you are in limp mode it is probably there. Don't worry about this one when you take care of the other trouble codes with a bypass kit this one will clear also.

P2445 - Pump Stuck OFF Bank 1
This code is normally caused by the secondary air injection pump not being able to create proper air pressure because the pump impeller is damaged, the air pump motor has been damaged and or has blown the air pump fuse. If the air pump motor has been damaged it is very common to see a P0418 code also which indicates the pump motor has been damaged. If the air pump fuse has been blown this code will come on but you may not see a P0418 code until the fuse is replaced. If P2445 code only comes on during your cold starts the bypass kit by itself will be able to take care of it.

*On some 05-06 4.7L vehicles there is a known Cold Weather glitch in the ECM. This glitch can occur when operating the vehicle in near freezing or below temperatures. If you start the vehicle in the freezing temps and the P2445 code comes on as you are driving and when you ~50mph there is a glitch in the ECM causing it. That is not the normal way for P2445 code to be thrown and it also does not typically cause limp mode. If you have a bypass kit installed on your vehicle there is nothing wrong with the bypass kit as this ECM glitch has been confirmed to happen on vehicles with and without the module installed and on vehicles with no other SAIS problems.

If you are experiencing this cold weather glitch the only known solution is an update of your ECM with the correct update (calibration file) for the ECM. However, finding the service bulletin or limited service campaign to get the correct calibration file is virtually impossible now as it has been removed from the Toyota Information System. The cold weather service bulletin was likely deleted after the current P0418/P2445 bulletin came out that directs the service manager and techs to just replace the entire system and does not indicate an update of the ECM. Replacing the entire air system will not correct the problem either even though the air injection control driver has a new part number. Currently there are only two viable remedies to the cold weather P2445 issue. The first is just to carry an OBDII tool, when it happens pull over clear the code and keep driving. The other is to perform a cold start warmup and shutdown before needing to get up to 50mph or faster. The vehicle can also be started and driven for a short while before being shutdown and restarted as long as it is before you get up to 50mph or greater. Basically, starting a new drive cycle with the engine warm will stop the P2445 code from coming on when you get going fast enough. If you need more information or have questions about the procedures let us know. With this work around procedure we hope to be able to build this work around into our bypass modules.

P011B - Temperature Correlation Error
This code is caused when the air intake temp and engine coolant temps are not within a certain range of each during the correlation test on a cold start. It can also be the result of installing one of our 05'-07' bypass units on an 08' or newer vehicle. The V5 and newer units are specifically designed to avoid this problem on the 08' and newer vehicles.

P106B - Pressure Sensor Correlation / Evap. Pressure Sensor
This code is caused when one of three pressure sensors are used to compare atmospheric pressure and one sensor is not reading the same as the other two. The three sensors that are compared are the two pressure sensors in the secondary air switching valves and the evap. pressure sensor. This code can show up even after installing the bypass module and clearing the codes because the test for P106B will not run if there are air switching valve codes already present. Most often the P106B is caused by a pressure sensor in one of the air switching valves by continuing to drive it with an air switching valve that is physically leaking exhaust. Most often it is easy to say the valve that had a valve stuck open code is the damaged sensor but the only way to make sure which sensor is causing the problem is to compare the freeze frame data for the three sensors when the code is thrown and stored. If the offending sensor is one that is part of the secondary air injection system we have Pressure Sensor Replacements (direct, wired, plug and play versions depending on vehicle) that can be added to the bypass kit to solve the problem without having to replace the bad air switching valve.

If you have any questions about your trouble codes please use the Contact Us form and include your vehicle information
and trouble codes. We would be glad to tell you what the bypass kit should be able to do for your situation.

SAIS and Other Trouble Codes For Reference Only.

C1201 - Engine Control System Malfunction - VSC and TR(A)C Prohibited
P0101 - MAF Circuit Range/Performance Problem
P0102 - MAF Circuit Low Input
P0103 - MAF Circuit High Input
P0111 - IAT Sensor Circuit Range/Performance Problem
P0112 - IAT Sensor Circuit Low
P0113 - IAT Sensor Circuit High
P0115 - ECT Circuit Malfunction
P0116 - ECT Circuit Range/Performance Problem
P0117 - ECT Circuit Low Input
P0118 - ECT Circuit High Input
P011B - ECT/IAT Correlation
P0412 - Switching Valve Circuit Malfunction Bank 1
P0415 - Switching Valve Circuit Malfunction Bank 2
P0416 - Switching Valve Relay Open Bank 2
P0417 - Switching Valve Relay Shorted Bank 2
P0418 - Relay 'A' Circuit Malfunction Bank 1
P0419 - Relay 'A' Circuit Malfunction Bank 2
P0420 - Catalyst System Efficiency Below Threshold Bank 1
P0430 - Catalyst System Efficiency Below Threshold Bank 2
P144C - Open in SAIS Heater Control Circuit
P144D - Short in SAIS Heater Control Circuit
P1440 - Vacuum Switching Valve Circuit Malfunction Bank 1
P1441 - Switching Valve No.2 Stuck Open Bank 1
P1442 - Switching Valve No.2 Stuck Close Bank 1
P1443 - Vacuum Switching Valve Circuit Malfunction Bank 2
P1444 - Switching Valve No.2 Stuck Open Bank 2
P1445 - Switching Valve No.2 Stuck Close Bank 2
P1603 - Engine Stall History
P1605 - Rough Idle
P1613 - Driver Malfunction Bank 1
P1614 - Driver Malfunction Bank 2
P2431 - Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2432 - Air Flow / Pressure Sensor Circuit Low Bank 1
P2433 - Air Flow / Pressure Sensor Circuit High Bank 1
P2436 - Air Flow / Pressure Sensor Circuit Range / Performance Bank 2
P2437 - Air Flow / Pressure Sensor Circuit Low Bank 2
P2438 - Air Flow / Pressure Sensor Circuit High Bank 2
P2440 - System Switching Valve Stuck Open Bank 1
P2441 - System Switching Valve Stuck Closed Bank 1
P2443 - System Switching Valve Stuck Closed Bank 2
P2444 - System Pump Stuck ON Bank 1
P2445 - System Pump Stuck OFF Bank 1
P2446 - System Pump Stuck On Bank 2
P2447 - System Pump Stuck Off Bank 2