How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

Perform troubleshooting according to the following flowchart.

HINT:

The intelligent tester can be used at steps 3, 4, 7, and 10.

VEHICLE BROUGHT TO WORKSHOP
CUSTOMER PROBLEM ANALYSIS
CHECK DTC AND FREEZE FRAME DATA
1. Record DTCs and freeze frame data.
CLEAR DTC AND FREEZE FRAME DATA
PROBLEM SYMPTOM CONFIRMATION
1. SYMPTOM DOES NOT OCCUR (GO TO STEP 6)
2. SYMPTOM OCCURS (GO TO STEP 7 )
SYMPTOM SIMULATION
CHECK DTC
1. Recheck for DTCs.
  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 HOW TO PROCEED WITH TROUBLESHOOTING ).
  - If communication to the power steering ECU assembly is not established through the intelligent tester, inspect terminals SIL of the DLC3 and power steering ECU assembly, and inspect the IG circuit of the power steering ECU assembly.
1. NORMAL SYSTEM CODE IS OUTPUT: GO TO STEP 8
2. TROUBLE CODE IS OUTPUT: GO TO STEP 9
PROBLEM SYMPTOMS TABLE
DTC CHART
CIRCUIT INSPECTION
IDENTIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST
END