Initial Inspection

DIAGNOSIS SYSTEM

a. Check the indicator.
1. Turn the ignition switch ON.





2. Check that the CRUISE MAIN indicator light comes on when the cruise control main switch is turned on, and that the indicator light goes off when the main switch is turned OFF.

HINT: If the indicator check result is not normal, proceed to troubleshooting for the combination meter section.





b. Check the DTC.

HINT: If a malfunction occurs in the No.1 vehicle speed sensors or actuator, etc. during cruise control driving, the ECU actuator AUTO CANCEL of the cruise control and turns on and oft the CRUISE MAIN indicator light to inform the driver of a malfunction. At the same time, the malfunction is stored in memory as a diagnostic trouble code.





c. Using diagnosis check wire, check the output of DTC.

1. Turn the ignition switch ON.
2. Using SST connect terminals Tc and E1 of DLC1.

SST 09843-18020

3. Read the DTC on the CRUISE MAIN indicator light.





HINT: If the DTC is not output, inspect the Tc circuit.
As an example, the blinking patterns for codes; normal, 11 and 21 are shown in the illustration.





ECU TERMINAL VALUES MEASUREMENT BY USING TOYOTA BREAK-OUT-BOX AND TOYOTA HAND- HELD TESTER
a. Hook up the TOYOTA break-out-box and TOYOTA hand-held tester to the vehicle.
b. Read the ECU input/output values by following the prompts on the tester screen.

HINT: TOYOTA hand-held tester has a "Snapshot" function. This records the measured values and is effective in the diagnosis of intermittent problems.
Please refer to the TOYOTA hand-held tester /TOYOTA break-out-box operator's manual for further details.