P1605

P1605 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:

On Board Diagnosis Logic
Malfunction is detected when an incorrect signal from TCM (Transmission control module) is sent to ECM.

POSSIBLE CAUSE
- Harness or connectors
[The communication line circuit between ECM and TCM (Transmission control module) is open or shorted.]

- Dead (Weak) battery
- TCM (Transmission control module)

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 10.5 V at idle.

With CONSULT-II
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.




3. Start engine and wait at least 40 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
Follow the procedure "With CONSULT-II".

Wiring Diagram

EC-ATDIAG-01:

Diagnostic Procedure

Step 1 - 3: