Code 0804

A/T Diagnosis Communication Line

COMPONENT DESCRIPTION
The malfunction information related to A/T (Automatic Transaxle) is transferred through the line (circuit) from A/T control unit to ECM. Therefore, be sure to erase the malfunction information such as DTC not only in A/T control unit but also ECM after the A/T related repair.





ECM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values, and are measured between each terminal and (25) (ECCS ground) with a voltmeter.





ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

With Consult
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Wait at least 40 seconds or start engine and wait at least 40 seconds.

OR

With Generic Scan Tool
(1) Turn ignition switch "ON".
(2) Wait at least 40 seconds or start engine and wait at least 40 seconds.
(3) Select "MODE 7" with GST.

OR

Without Scan Tool
(1) Turn ignition switch "ON".
(2) Wait at least 40 seconds or start engine and wait at least 40 seconds.
(3) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(4) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.





DIAGNOSTIC PROCEDURE