AutoCodes – Toyota – P1436 Toyota

P1436 Toyota Code - Bypass Valve Malfunction

Quick Answer

By-pass valve is used with the Hydrocarbon Adsorber Catalyst (HCAC) system. Common causes include Defective vacuum hose or line, Defective actuator, Defective by-pass valve. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P1436 Toyota indicates Bypass Valve Malfunction.
Common causes: Common causes include Defective vacuum hose or line, Defective actuator, Defective by-pass valve.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 12,923

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 05, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1436 Toyota Description

By-pass valve is used with the Hydrocarbon Adsorber Catalyst (HCAC) system. Before engine is started, by-pass valve is open. When engine starts, Engine Control Module (ECM) delivers an output signal to HCAC Vacuum Switching Valve (VSV). HCAC VSV opens, allowing vacuum to be applied to actuator which causes the by-pass valve to close. When by-pass valve closes, exhaust gases pass into the HC adsorber where the gases are stored until the temperature of front Three-Way Catalytic Converter (TWC) increases. This prevents hydrocarbons from being delivered from vehicle when TWC temperature is low. After TWC becomes warm, the HCAC VSV closes and vacuum to by-pass valve is shut off, causing by-pass valve open. When rear TWC becomes warm, exhaust emissions are cleaned by the TWC. The HCAC VSV may also be operated during a deceleration condition when HC adsorber is warm in order to scavenge the hydrocarbons that remain in the HC adsorber. DTC is set if by-pass valve does not operate properly.

OBDII Code P1436 Toyota - Bypass Valve Malfunction - AutoCodes.com — P1436 Toyota Code - Bypass Valve Malfunction

What does this mean?

What are the Possible Causes of the DTC P1436 Toyota?

Defective vacuum hose or line
Defective actuator
Defective by-pass valve
Defective front exhaust pipe

How to Fix the DTC P1436 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

There is a Factory Service Bulletin for the following Toyota Models:
2001 Toyota Prius
2002 Toyota Prius
2001-2002 Toyota Prius Factory Service Bulletin OBDII Code P1436

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1436 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.