With Scan Tool

DIAGNOSTIC OUTPUT INSPECTION
Inspection of diagnosis is performed when automatic cancellation occurs during auto-cruise control without cancellation mode by the driver.





WHEN USING THE SCAN TOOL [MULTI-USE TESTER (MUT) <1993 models> OR MUT-II ]
1. Connect the scan tool (MUT-II) to the data-link connector. When connecting the scan tool (MUT-II) to a 1993 model vehicle, use the adapter harness supplied together.

CAUTION: Turn the Ignition switch off before connecting or disconnecting the scan tool.

2. Compare the read output code with the chart below to find the cause systematically.
3. If the diagnostic trouble code No. is displayed, check in accordance with the inspection chart No. corresponding to each code No.

NOTE: In order to permit of checking if the trouble occurred in the past, the diagnostic trouble code remains in memory until the cable is disconnected from the battery terminal even if the ignition key is placed in the OFF position.

The diagnostic trouble code can also be erased by the following method.
(1) Place the ignition switch in the ON position.
(2) With the SET switch in the ON position, set the main switch to the ON position. Within 1.0 seconds from this operation, place the RESUME switch in the ON position.
(3) With the SET switch placed in the ON position again, keep the stop light switch in the ON position for more than five seconds.
(4) Turn off the main switch once and turn it on again.
(5) Check the diagnostic trouble code to see if the normal code is output.

INPUT CHECKING
Input checks should be made when the cruise control system cannot be set and when it is necessary to check (when a malfunction related to the cruise control system occurs) whether or not the input signals are normal.

NOTE:
1. Input check can be conducted by set operations. On-board diagnostic terminal outputs display patterns.
2. Display codes are displayed only if the circuit is normal according to the conditions shown in the table in Trouble Code Descriptions.

Perform checks using the following procedures.
1. Connect a voltmeter to the data-link connector of the junction block.

2. Calling up a code





(1) Set the ignition switch to ON.





(2) With the SET switch in the ON state, set the main switch to ON. In less than 1.0 second thereafter, set the RESUME switch to ON. Then the input check results can be displayed.

3. Reading a code
(1) Perform the individual input operations according to the input check table and read the codes.

NOTE:
1. When two or more input operations are performed simultaneously, all the associated code numbers are output in ascending order.
2. If no code is output by performing any of the input operations, the control unit power supply circuit or SET and RESUME switches are probably defective. Check the check chart 1 and 2.