How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORK SHOP
(See CUSTOMER PROBLEM ANALYSIS CHECK )
CHECK AND CLEAR DTCS (See PRE-CHECK )
PROBLEM SYMPTOM CONFIRMATION
SYMPTOM DOES NOT OCCUR (GO TO STEP 5 )

SYMPTOM OCCURS (GO TO STEP 6 )
SYMPTOM SIMULATION (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
DTC CHECK (See PRE-CHECK  )
MALFUNCTION CODE (GO TO STEP   7 )

NORMAL CODE (GO TO STEP   8 )
See DIAGNOSTIC TROUBLE CODE TABLE
GO TO STEP 9
See PROBLEM SYMPTOMS TABLE
CIRCUIT INSPECTION (See DTC P0500/21 VEHICLE SPEED SENSOR "A"; DTC P0503/23 VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH to DIAGNOSIS CIRCUIT )
See TERMINALS OF ECM )
INDEMNIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST

HINT:

Step 3, 6, 9, 13

Diagnostic steps permitting the use of the hand-held tester.