Code 0804

DTC 0804 A/T Diagnosis Communication Line

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




ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 32 (ECCS)




On Board Diagnosis Logic

DTC Confirmation Procedure

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V.




With CONSULT
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.
3. Start engine and wait at least 40 seconds.

With GST
1. Turn ignition switch "ON".
2. Start engine and wait at least 40 seconds.
3. Select "MODE 7" with GST.

No Tools
1. Turn ignition switch "ON".
2. 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.

Steps 1 - 3:

Diagnostic Procedure




Wiring Diagram