POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING (2008 Sequoia)

Last Modified: 11-29-2007		1.6 D
Service Category: Steering	Section: Power Assist Systems
Model Year: 2008	Model: Sequoia	Doc ID: RM00000274T00CX
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING (2008 Sequoia)

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:

1.	VEHICLE BROUGHT TO WORKSHOP

2.	INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

3.	CUSTOMER PROBLEM ANALYSIS

4.	PROBLEM SYMPTOM CONFIRMATION

5.	CHECK CAN COMMUNICATION SYSTEM*

Result	Proceed to
CAN system DTC is not output	A
CAN system DTC is output	B

HINT:

When any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first.
When communication to the power steering ECU is not established through a Techstream, inspect terminals CANH and CANL of the DLC3 and the power steering ECU, and the IG circuit of the power steering ECU.

PROCEED TO CAN COMMUNICATION SYSTEM

6.	CHECK VEHICLE STABILITY CONTROL SYSTEM*

(a) Check for DTCs .

Result	Proceed to
DTC output	A
DTC not output	B

HINT:

When any vehicle stability control system DTCs are output, perform troubleshooting on the vehicle stability control system first.

PROCEED TO VEHICLE STABILITY CONTROL SYSTEM

7.	CHECK SFI SYSTEM*

(a) Check for DTCs.

(3UR-FE: )

(2UZ-FE: )

Result	Proceed to
DTC output	A
DTC not output	B

HINT:

When any SFI system DTCs are output, perform troubleshooting on the SFI system first.

PROCEED TO SFI SYSTEM

8.	PROBLEM SYMPTOMS TABLE

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

Go to step 10

9.	OVERALL ANALYSIS AND TROUBLESHOOTING

(a) Terminals of ECU .

10.	REPAIR OR REPLACE

11.	CONFIRMATION TEST*

END