Diagnosis System

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

DIAGNOSIS SYSTEM

Description
The ECM stores trouble codes when trouble occurs on the vehicle.

The diagnosis system allows for reading of the trouble codes from the DLC3. If the CRUISE MAIN indicator light does not come on after DTC check, it means a malfunction has occurred in the cruise control system.

Use the hand-held tester or SST to check and solve the problem.

Check the DLC3

The ECM uses ISO 9141-2 for data communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Fig 1: Identifying DCL3 Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL CONDITION

Terminal No.	Tester connection/Specification	Condition
4	Chassis Ground - Body Ground / 1 Ω or less	Always
16	Battery Positive - Body Ground / 9 to 14 V	Always

HINT:

If the display shows "UNABLE TO CONNECT TO VEHICLE" after connecting the hand-held tester to the DLC3 and turning the ignition to the ON position, there is a problem either with the vehicle or the tool. (Hand held tester ONLY)

If communication is normal when connecting the tool to another vehicle, inspect the DLC3 on the original vehicle.
If communication is still not possible when connecting the tool to another vehicle, it suggests the problem is the tool's own. In this case, consult the Service Department listed in the tool's instruction manual.

Check the indicator.
1. Turn the ignition switch to the ON position.
2. Check that the CRUISE MAIN indicator light comes on when the cruise control main switch ON-OFF button is pushed on, and that the indicator light goes off when the ON-OFF button is pushed off.
Fig 2: Identifying Cruise Control Main Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Checking CRUISE MAIN Indicator Light Comes ON
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If there is a problem with the indicator light, inspect the cruise main indicator light circuit (see CRUISE MAIN INDICATOR LIGHT CIRCUIT ).

HINT:

If a malfunction occurs in the vehicle speed sensors, stop lamp switch assy or other related parts while cruise control driving, the ECM actuates AUTO CANCEL of the cruise control. Then the CRUISE MAIN indicator light starts to blink, informing the driver of the malfunction. At the same time, data of the malfunction is stored as a diagnostic trouble code (DTC).

Fig 4: CRUISE MAIN Indicator Light Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002