M.I.L. “ON” DTC P0420 – 2001-2003 Toyota Sienna

EG047-05
October 19, 2005

 

Title:

M.I.L. “ON” DTC P0420

 

Models:

’01 – ’03 Sienna

 

Introduction

Under certain driving conditions, some 2001 – 2003 model year Sienna vehicles may exhibit a M.I.L. “ON” with the following DTC:

• P0420 (Catalyst System Efficiency Below Threshold [Bank 1])

The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to improve this condition.

 

Applicable Vehicles

• 2001 – 2003 model year Sienna vehicles.

 

Parts Information

PREVIOUS PART NUMBER	CURRENT PART NUMBER	PART NAME	QTY
89661-08061	89661-08062	Module, Engine Control	1
89661-08070	89661-08071
89661-08080	89661-08081

 

Warranty Information

OP CODE	DESCRIPTION	TIME	OFP	T1	T2
895011	R & R Engine Control Module	0.5	89661-08061 89661-08070 89661-08080	8A	71

 

Applicable Warranty*:

This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.

* Warranty application is limited to correction of a problem based upon a customer’s specific complaint.

 

Required SSTs

ITEM NO.	SPECIAL SERVICE TOOLS (SSTs)	PART NUMBER	QTY	DRW**
1	Toyota Diagnostic Tester Kit* NOTE: All components from this kit/set are required 12 Megabyte Diagnostic Tester Program Card (P/N 01002593-005) with version 13.0a Software (or later) is required	TOY220036	1	9

 

*      Essential SSTs.
**       Refers to drawer number in SST Storage System.

 

NOTE:

Additional Diagnostic Tester Kits, Program Cards, or other SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.

1. Verify DTC P0420 with the Diagnostic Tester by referring to the Technical Information System (TIS), 2001 – 2003 model year Sienna Repair Manual: Diagnostics: Engine: Pre-Check.
2. Replace ECM (PCM). Follow the Repair Manual ECM replacement instructions.

Refer to TIS, 2001 – 2003 model year Sienna Repair Manual: Introduction: How To Troubleshoot ECU Controlled Systems: How To Use The Diagnostic Chart And Inspection Procedure.

3. Perform the following steps to confirm that the vehicle is repaired.

A. Reset the Readiness test by using the “Clear DTC” function on the Diagnostic Tester.

• To clear the DTC, refer to TIS, 2001 – 2003 model year Sienna Repair Manual: Diagnostics: Engine: Pre-Check.

B. Perform Readiness Monitor Drive Patterns for Catalyst Monitor O2S type and

AF Sensor type. Refer to TSB No. EG003-02, “Readiness Monitor Drive Patterns,” procedures: Catalyst Monitor (O2S Type) and Catalyst Monitor (AF Sensor Type).

C. If a DTC is set during the above drive patterns, refer to the Diagnostic Trouble Code Chart in TIS, 2001 – 2003 model year Sienna Repair Manual: Diagnostics: Engine: Diagnostic Trouble Code Chart. Test drive the vehicle to confirm normal operation.

4. If NO DTCs (pending or current) are stored, the repair is complete.