Emissions - MIL ON/DTC P2420 Set
T-SB-0028-11April 7, 2011
MIL "ON" DTC P2420
Service Category
Vehicle Interior
Section
Meter/Gauge/Display
Market
USA
Applicability
Introduction
Some 2009 - 2010 model year Japan built Toyota vehicles may exhibit a MIL "ON" condition with Diagnostic Trouble Code (DTC) P2420 (Evaporative Emission System Switching Valve Control Circuit High) present. The charcoal canister has been updated to address this condition.
Production Change Information
This TSB applies to vehicles produced WITHIN the applicable VIN ranges shown.
Parts Information
Warranty Information
Required Tools & Equipment
Repair Procedure
1. Using TIS Techstream check for Diagnostic Trouble Codes (DTCs).
2. Are codes other than P2420 present?
^ YES - Diagnose other DTC(s) first.
^ NO - Continue to step 3.
3. Inspect VSV for proper power and ground circuits.
Perform the following checks with the Canister Pump Module Connector connected and back probe the pins to obtain the readings.
A. Check for voltage between Pin 9 (VLVB) and Chassis Ground. With IG ON voltage should read between 9 V and 14 V
^ YES - Proceed to next step (3B).
^ NO - This TSB does NOT apply - inspect and repair wiring.
B. Check for voltage between pin 8 (VGND) and Chassis Ground. With IG ON voltage should read between 9 V and 14 V
^ YES - Proceed to next step (3C).
^ NO - Vent Valve is open - proceed to step 4.
C. Using TIS Techstream activate the VSV and check voltage between pin 8 (VGND) and Chassis Ground.
Powertrain > Engine > Active Test > Activate the VSV for Vent Valve
^ 9 V - 14 V present - This TSB does NOT apply - inspect and repair wiring. < 1 V present - Proceed to step 4.
4. Replace the Charcoal Canister Assembly.
Refer to TIS applicable model and model year Repair Manual:
5. Clear all DTCs using TIS Techstream.
6. Perform the Automatic EVAP System Check and verify that no pending DTCs set. System > Engine and ECT > Utility > EVAP System Check
NOTE
If the Automatic EVAP System Check fails to run, perform the following:
^ Turn the ignition OFF.
^ Turn TIS Techstream OFF.
^ Turn the ignition ON and TIS Techstream ON and restart the Automatic EVAP System Check.