How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORKSHOP
CUSTOMER PROBLEM ANALYSIS (See CUSTOMER PROBLEM ANALYSIS CHECK )
CONNECT OBD HAND-HELD TESTER TO DLC3
HINT:

If the display indicates a communication fault in the tool, inspect the DLC3.
CHECK DTC AND FREEZE FRAME DATA (See DTC CHECK/CLEAR )
HINT:

Record or print DTC and freeze frame data, if needed.
CLEAR DTC AND FREEZE FRAME DATA (See DTC CHECK/CLEAR )
VISUAL INSPECTION
SETTING CHECK (TEST) MODE DIAGNOSIS (See CHECK MODE PROCEDURE )
PROBLEM SYMPTOM CONFIRMATION
HINT:

If the engine does not start, perform steps 10 and 12 first.

Fig 1: Malfunction Occur Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. B: Go to step 10 .
2. A: Go to next step.
SYMPTOM SIMULATION
DTC CHECK (See DTC CHECK/CLEAR )

Fig 2: Malfunction Code Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. B: Go to step 12 .
2. A: Go to next step.
DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )
Go to step 14
BASIC INSPECTION (See BASIC INSPECTION )

Fig 3: Wrong Part Confirmed Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. B: Go to step 17
2. A: Go to next step.
PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

Fig 4: Wrong Part Confirmed Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. B: Go to step 17
2. A: Go to next step.
CHECK ECM POWER SOURCE CIRCUIT (See ECM POWER SOURCE CIRCUIT )
CIRCUIT INSPECTION

Fig 5: Malfunction Confirmed Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. B: Go to step 18
2. A: Go to next step.
CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )
Go to step 18
PARTS INSPECTION
IDENTIFICATION OF PROBLEM
ADJUSTMENT, REPAIR
CONFIRMATION TEST
END