Tester Installation

Installing the transmission tester at the transmission connector allows separation of the vehicle electronics from transmission electronics. Disconnecting normal vehicle electronics will set additional codes and cause firm shifts. (Disconnecting the transmission connector defaults transmission to maximum line pressure.)

NOTE: During tester use, additional DTCs may be set. Therefore, it is important that all codes are erased after repair has been made. To verify elimination of all codes, rerun On-Board Diagnostics.

1. Disconnect the vehicle wiring harness at transmission connector.

CAUTION:
- Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in transmission concerns. If vehicle is equipped with transmission heat shield, remove it. Always reinstall the transmission heat shield when the procedure is completed.
- Route all cables away from heat sources.

2. Turn the tester solenoid select switch to the OHMS CHECK position.
3. Install the appropriate overlay onto tester. Connect appropriate interface cable to transmission tester and then to the appropriate transmission connectors.

4. Install a line pressure gauge into line pressure tap on transmission.

CAUTION: Route gauge line away from heat sources.

5. Plug transmission tester power supply into cigar lighter receptacle. At this time, all LEDs should illuminate for a short period and then turn OFF. This is the tester internal circuit check.
6. Position bench/drive switch to BENCH mode.