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Toll Free: 1 (844) 307-7671
Tundra 2007 5.7L Secondary Bypass Kit
The Hewitt-Tech Secondary Air Injection System Bypass Kit
Home of the Hewitt-Tech Toyota/Lexus Secondary Air Injection System
Bypass Kits. These kits offer a cost effective solution for the failure
prone Secondary Air Injection Systems found on certain Toyota truck and
SUVs. The bypass kit can prevent many of the trouble codes caused by a
mechanical failure of the secondary air pump or a secondary air valve
saving you as much as a $2000-$4000 on a repair bill, turn off your CEL
and keep the vehicle out of limp mode. Contact us with any questions
regarding the bypass kit, shipping or your trouble codes at 1(844)
This wired version of the bypass kit installs very easily by tapping directly into the factory IAT/MAF Sensor harness. Detailed installation instructions are easy to follow and include all needed wire colors and an easy to read wire diagram for proper installation. For those that prefer a more professional and discreet looking installation this easy 6 wire hookup allows the bypass kit to look like it belongs in the engine compartment while being more affordable than our Plug In Version.
Wired Bypass Kit Includes:
1 x SAIS Bypass Module - Wire In Connection
1 x Pair of Exhaust Valve No.2 Block Off Plates - Engine Specific (may be different than shown)
1 x 10' Piece of Violet 20 AWG TXL - Starter Relay Connection Wire
1 x Printed Copy - Detailed Bypass Module Installation Instructions
1 x Printed Copy - Block Off Plate Instructions - Engine Specific
Black Poly Split Loom harness built with 3m™ Super 88+ Tape - Flame Resistant
Custom Made Compact Solid State Electronic Module
4cm x 4cm x 1.4cm Black Duroplastic High Temp Enclosure - UL 94 V-0 Flame Resistance
High Quality Automotive Engine Compartment Grade TXL Wiring
The starter relay connection is an option ONLY available on "The Original" SAIS Bypass Modules
3M™ Automotive Acrylic Double Sided Tape for mounting
Black Epoxy Potted for environmental and shock protection
Assembled 100% by hand in the USA!
For use on Off-Road, Racing or other emissions exempt vehicles only
16 gauge (1/16 inch) 316 Stainless Steel Block Off Plate Construction For Lifetime Use
Water Jet Cut for Precision and Smoother Edges, Guaranteed to Fit Your Engine
Not Sure What You Need?
Give us a Call TOLL FREE 1-844-307-7671
More About the Bypass Kit
The bypass module is activated when the ignition is first switched
to "ON" and any time it detects a 4-12V signal on the starter relay
wire. The starter relay option is only available on the Hewitt-Tech SAIS
Bypass Modules! This option, when connected, ensures that the module
actively prevents the SAIS from running on EVERY start. With the starter
relay wire connected you can turn the ignition to "ON" for any period
of time and the module will be active as soon as you crank the engine.
Without the starter relay wire connection you would need to turn the ignition back "Off" and then crank the vehicle to ensure the module is
active or the system could operate and cause trouble codes and the CEL
to come back on. Just install the kit with the starter relay wire
connection and don't worry about having to start the engine as soon as
you turn the key on! If anyone else drives the vehicle this is a Must!
The included No.2 Exhaust Valve Block-off Plates are an integral
part of the bypass kit (images may not match the plates you receive for
your specific engine). The block off plates are the only way to isolate
the exhaust valves and the related pressure sensor(s) from the exhaust.
By completely isolating the system from the exhaust the pressure sensors
are prevented from causing valve stuck open trouble codes which are the
main cause of limp mode when this system fails. Even though a system is
bypass and should never run again, the Exhaust No.2 valves can still
leak exhaust and cause future trouble. Installing the block off plates
is the only way to prevent future valve trouble and limp mode. Again, it
is just best to install and forget about it.Don't see a kit for your vehicle? Check out our store HERE
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
"Standard" codes the kits can usually 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
P2447 - Pump Stuck Off Bank 2
There is the occasional exception like a blown air pump fuse or damaged air pressure sensors.
Codes the kits can take care of with the addition of a Pressure Sensor Replacement Harness
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
Only vehicles with two damaged pressure sensor you will need a Pressure Sensor Harness-Double.
Codes the kits can take care of with the addition one or two Pump Proxy Packs
P0418 - Relay 'B' Circuit Malfunction
P0419 - Relay 'B' Circuit Malfunction
Usually caused by an open circuit/damaged air pump motor. 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
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 kit will be able to take care of it.
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. This code could be caused by having a damaged pressure
that is reading outside the normal range . Or, it could also be from
installing one of our V3 or older units on a 2008 or newer vehicle. The
V5 and newer units are specifically designed to avoid this problem.
P106B - Pressure Sensor Correlation / Evap. Pressure Sensor
This code is caused when the computer compares three different pressure
sensors reading atmospheric pressure after the vehicle has been off for a
certain period of time.
If one of these sensors reads a pressure that is a certain margin
outside the other two sensors the code will be set. It is often caused
by a damaged secondary air injections system pressure sensor
that is built into one of the air switching valves. The three sensor
readings must be compared in the freeze frame data that was stored when
the code was set to determine the offending sensor.
If one of the SAIS pressure sensors is causing the code a Pressure
Sensor Jumper Harness added to a bypass kit can be used to eliminate the
code without having to replace the bad air switching valves.
Handling time: 1-2 business days.
FREE Expedited Shipping (USPS Priority Mail 2-3 Days)
$30(US) Expedited Shipping (USPS Priority Mail Express 1-2 Days)
$45(US) One-Day Shipping (FedEx Priority Overnight 1-2 Days)
Seller charges sales tax for items shipped to SC (6%)
Return Policy Information
Hewitt-Tech will Only accept returns for items that are New, Unopened and in their Original Packaging. .
To qualify for a return you must contact us within 30 days of purchase
for a Return Merchandise Authorization (RMA) number. Once an RMA number
has been issued they are valid for 14 days.
All authorized returns are subject to a 20% restocking fee based on the
original purchase price excluding shipping after receipt and inspection.
Refunds will only be issued to the original purchaser and credited back
to the original funding option (CC, Paypal etc...)
At our discretion items returned in other than new condition, returned
with no RMA or after an RMA has expired may be subject to higher
restocking fees or have the return denied.
Buyers are responsible for paying return shipping which must include a
Wired Bypass Kits
Plug and Play Bypass Kits
Hewitt Technologies Inc.
Lexington, SC 29072
Call Toll Free: 1 (844) 307-7671
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