How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use these procedures to troubleshoot the power steering system.
*: Use the Intelligent tester or Techstream.

VEHICLE BROUGHT TO WORKSHOP
INSPECT AUXILIARY BATTERY VOLTAGE
Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding.
CHECK DTC AND FREEZE FRAME DATA*
1. Record DTCs and freeze frame data.
CLEAR DTC AND FREEZE FRAME DATA*

PROBLEM SYMPTOM CONFIRMATION

Result

RESULT CHART

Result	Proceed to
Symptom does not occur	A
Symptom occurs	B

B: Go to step 7

A: Go to next Step

SYMPTOM SIMULATION

CHECK DTC*

Check for DTCs (see DTC CHECK / CLEAR ).
Delete DTCs

Recheck for DTCs

Result

RESULT CHART

Result	Proceed to
DTC does not reoccur	A
DTC reoccurs	B

HINT:

Refer to the DIAGNOSTIC TROUBLE CODE CHART if any DTCs are output.
If any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first (see DIAGNOSIS SYSTEM ).
If communication to the power steering ECU is not established through the Intelligent tester or Techstream, inspect terminals CANH and CANL of the DLC3 and power steering ECU, and inspect the IG circuit of the power steering ECU.

B: Go to step 9

A: Go to next Step

PROBLEM SYMPTOMS TABLE
CIRCUIT INSPECTION
IDENTIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END