Toyota Camry Manual page 237

AX2–50
AUTOMATIC TRANSAXLE – TROUBLESHOOTING
HOW TO PROCEED WITH TROUBLESHOOTING
The Transaxle Control System broadly consists of the sensors, ECM and actuators. The ECM
receives signals from various sensors, judges the operating conditions and determines the shift
and lock–up timing.
When troubleshooting OBD n vehicles, use an OBD II Scan Tool complying with SAE J 1978 or
TOYOTA hand–held tester to confirm the diagnostic trouble codes, freezed frame data and
engine data.
This will enable you to determine the system causing the problem.
This section explains the best method of troubleshooting and how to carry out the necessary
repairs.
(1) CUSTOMER PROBLEM ANALYSIS
Using the customer problem analysis check sheet for reference, ask the customer in as much
detail as possible about the problem.
(2) CONNECT THE OBDII SCAN TOOL OR TOYOTA HAND–HELD TESTER TO DLC3
Connect the OBD ll scan tool complying with SAE J 1978 or TOYOTA hand–held tester to the
vehicle's data link connector 3.
NOTICE: For OBDll scan tool or TOYOTA hand–held tester operating instructions, see the instruction
booklet accompanying the scan tool.
If your display shows "UNABLE TO CONNECT TO VEHICLE" when you have you have connected
the scan tool/TOYOTA hand–held tester cable to DLC3, turned the ignition switch ON and
operated the scan tool/TOYOTA hand–held tester, inspect DLC3 (See page AX2–57).
(3) CHECK DIAGNOSTIC TROUBLE CODE AND FREEZED FRAME DATA (PRECHECK)
First check the diagnostic trouble codes. If a code is output, make a note of it.
Also check and note the freezed frame data.
HINT: Output of the malfunction code indicates a circuit malfunction. However, it does not
indicate whether the malfunction is still occurring or occurred in the past and returned to normal.
To determine this, first confirm the problem symptoms in (7) and then recheck the diagnostic
trouble code in¿¿. If troubleshooting has begun based only on the malfunction code in the
diagnostic trouble code check in 0, it could result in a misdiagnosis and troubleshooting of
circuits which are normal, making it more difficult to locate the cause of the problem.
(4) CLEAR DIAGNOSTIC TROUBLE CODE AND FREEZED FRAME DATA
Use the OBDII scan tool or TOYOTA hand – held tester to erase the diagnostic trouble codes and
freezed frame data.
NOTICE: For OBDII scan tool or TOYOTA hand–held tester operating instructions, see the instruction
booklet accompanying the scan tool.
(5) VISUAL INSPECTION
(6) SETTING THE CHECK MODE DIAGNOSIS
(7) PROBLEM SYMPTOM CONFIRMATION
Confirm the problem symptoms.
(8) SYMPTOM SIMULATION
If the problem does not reappear, be sure to simulate the problem by mainly checking the circuits
indicated by the diagnostic trouble code in step (3), using "Problem Simulation method".
(9) DIAGNOSTIC TROUBLE CODE CHECK
Check the diagnostic trouble codes. Check if there is abnormality in the sensors or the wire
harness.
If a malfunction code is output, proceed to (9) Diagnostic Trouble Code Chart". If the normal code
is output, proceed to (14) Matrix Chart of Problem Symptoms".
Be sure to proceed to (9) Diagnostic Trouble Code Chart" after the steps (2) to (6) inclusive are