Gen 1: Secondary Air Injection System Bypass Kit (Plug & Play)
The Gen 1 (V36H) is compatible with most 2005 – 2007 models. It is our basic bypass kit that enables you to clear the Check Engine Light, Limp Mode and error codes related to mechanical SAIS faults. Bypass kit will include Block off Plate(s) and Starter Relay Wire.
Hewitt Tech Generation 1 Secondary Air Injection System Bypass Kit (Plug & Play)
The Hewitt Tech (HT) Gen 1 Bypass Kit prevents operation of the SAIS at cold soak start. The Gen 1 is our basic bypass kit that enables you to clear the Check Engine Light, Limp Mode and error codes related to mechanical SAIS faults. The V36H is compatible with most Toyota and Lexus vehicles model years ’05 – ’07. The Plug & Play version of the Gen 1 Bypass kit offers all the same features and benefits of the Wired version but decreases labor/Install time with connectors compatible with the vehicle’s factory components. All wiring connections, except the starter relay wire, are achieved using the Plug & Play harness. It is made with automotive grade materials and designed to blend in with the factory wiring harness. This allows for a very clean factory looking installation. Easy to follow step by step installation instructions are included with vehicle specific illustrations. We recommend the Gen 1 Plug & Play Bypass kit for both professionals and DIY mechanics because of the ease of install and proven performance.
It is Important to understand that HT SAIS Bypass kits are engineered to work with Factory or OEM SAIS components. That said, aftermarket SAIS components can cause fault codes to be present after installation of the bypass kit. This typically means you will need HT Kit Addon(s) in order to clear SAIS codes that are still present.
The following are Mechanical Trouble codes the Gen 1 Bypass Kit typically addresses*:
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
The following are Trouble codes NOT addressed by the Gen 1 Bypass. These will require kit addon(s) in order to clear. However, if you are getting any electrical codes our recommended solution is the Gen 2 Bypass kit.
P0412 – SAIS Switching Valve ‘A’ Circuit Malfunction Bank 1
P0415 – SAIS Switching Valve ‘B’ Circuit Malfunction Bank 2
P0418 – SAIS Circuit/Relay ‘A’ Circuit Malfunction Bank 1
P0419 – SAIS Circuit/Relay ‘B’ Circuit Malfunction Bank 2
Electrical SAIS error codes are usually caused by an open or short circuit in one of the Air Switching Valves or Air Pumps. Each code would require a separate addon.
Pressure Sensor Codes
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
These codes typically indicate a damaged Pressure Sensor which is usually caused by an Air Switching Valve being stuck open for an extended period of time. Functioning Pressure Sensors are needed for both Gen 1 and Gen 2 Bypass kits. Compatible Pressure Sensor addon required in order to clear.
GEN 1 Plug & Play BYPASS KIT INCLUDES:
- 1 x SAIS Bypass Module – Plug & Play Connections (IAT/MAF)
- 2 x Secondary Exhaust Valve Block Off Plates (Engine Specific)
- 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)
- Bypass Wiring Harness:
- Straight forward Plug & Play connections compatible with Factory components.
- High Quality Automotive Engine Compartment Grade TXL Wiring
- Bypass Module:
- 4cm x 4cm x 1.4cm Black Duroplastic High Temp Enclosure – UL 94 V-0 Flame Resistance
- Black Epoxy Potted for environmental and shock protection.
- Block Off Plates:
- 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
- Start Relay Wire:
- ONLY available from Hewitt Technologies home of The Original SAIS Bypass Modules.
- 10′ Piece of Violet 20 AWG TXL wire with female disconnect terminal.
- 3M™ Automotive Acrylic Double-Sided Tape for mounting
- Assembled 100% by hand in the USA!
- Limited Life-Time Warranty
MORE ABOUT THE SAIS 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 wire is only available from Hewitt Technologies home of the Original SAIS Bypass Modules! 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 Air Switching Valve Block-off Plates are an integral part of the bypass kit. The Block Off Plates are the only way to isolate the Air Switching Valves and protect the related Pressure Sensor(s) from damage caused by exhaust. Open Air Switching Valves and Pressure Sensors exposed to exhaust are the primary cause of Limp Mode and SAIS failure.
It is important to understand that installing a HT bypass will prevent your Air Pumps and Air Switching Valves from operating. However, it will not close the Air Switching Valves or keep them closed in the future. That said, choosing not to install the Block Off Plates leaves the SAIS vulnerable because exhaust may leak into open valves and damage the Pressure Sensors. As noted above, both Gen 1 & 2 HT bypass kits require kit addons to clear SIAS Pressure Sensor codes. Do yourself a favor, avoid future frustrations and costs; install the Block Off Plates.
If you are having a hard time determining which is the best solution for your vehicle, please do not hesitate to give us a call or send an email. Hewitt is here to help!
*The vehicles fuses, Pressure Senor(s), factory wiring harness and Engine Control Module (ECM) must be in good working condition for bypass kit to operate properly.
**There is a known “Cold Weather Glitch” on some older 4.7L engines. If the vehicle is tripping a P2445 and it is caused by this glitch; the Hewitt Technologies SAIS Bypass Kit will not resolve the issues. Please visit our Error Codes page or give us a call to learn more.
It is illegal to remove, dismantle or otherwise cause to be inoperative any pollution control device required by federal, state, or local emissions law. Our bypass kits are sold for off-road, competition or other emissions exempt vehicles only. No other applications are intended or implied. By installing or using this SAIS Bypass Kit the vehicle owner and installer acknowledge and assumes ALL risks associated with its use.
|Dimensions||7 × 5 × 1.5 in|
2005, 2006, 2007
Tundra, Sequoia, 4Runner, Tacoma, Land Cruiser, Hilux, GX 470, LX 470
2.7L, 4.0L, 4.7L, 5.7L