Cooling System MIL ON/DTC's P0116 Or P0128 Set

L-SB-0004-10

January 14, 2010

MIL "ON" DTC P0128 or P0116

Service Category
Engine/Hybrid System

Section
Cooling

Market
USA





Applicability

Introduction

Some 2008 - 2009 model year vehicles equipped with a 2GR-FSE or 4GR-FSE engine may exhibit a MIL "ON" condition with one or more of the following Diagnostic Trouble Codes (DTCs):

^ P0128 - Coolant Thermostat (Coolant Thermostat Below Thermostat Regulating Temperature)

P0116 - Engine Coolant Temperature Range/Performance Problem Use the following repair procedure to diagnose and repair customer complaint vehicles.





Parts Information

Production Change Information





This TSIB applies to vehicles produced BEFORE the Production Change Effective VINs shown.





Warranty Information

APPLICABLE WARRANTY

^ This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for 48 months or 50,000 miles, whichever occurs first, from the vehicle's in-service date.

^ Warranty application is limited to occurrence of the specified condition described in this bulletin.








Required Tools & Equipment

Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE).

Repair Procedure

1. Using TIS Techstream check for any stored DTCs.

2. If DTCs P0128 and/or P0116 are present remove and inspect the thermostat housing and thermostat.





Is the thermostat assembly securely seated in the thermostat housing? See Figures 1 and 2 for reference.

^ YES - This TSIB does NOT apply. Refer to the Repair Manual and follow diagnostics for the DTC.

^ NO - Go to step 3.

3. Replace the thermostat and thermostat housing.





Refer to the Technical Information System (TIS) applicable model and model year Repair Manual:

4. After the repair is complete clear any stored DTCs and test drive the vehicle to confirm the repair.