How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORK SHOP
CUSTOMER PROBLEM ANALYSIS CHECK
CHECK AND CLEAR DTCS (See PRE-CHECK )
PROBLEM SYMPTOM CONFIRMATION
1. SYMPTOM DOES NOT OCCUR (GO TO STEP 5)
2. SYMPTOM OCCURS (GO TO STEP 6 )
SYMPTOM SIMULATION (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
DTC CHECK (See PRE-CHECK )
1. MALFUNCTION CODE (GO TO STEP 7)
2. NORMAL CODE (GO TO STEP 8 )
DIAGNOSTIC TROUBLE CODE CHART
GO TO STEP 9
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 )
CHECK TERMINALS OF ECM
Go to Next Step
INDEMNIFICATION OF PROBLEM
Go to Next Step
REPAIR OR REPLACE
Go to Next Step
CONFIRMATION TEST
END

HINT:

Step 3, 6, 9, 13:

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