2: Installing the Transmission Tester

Rotunda Transmission Tester

Step1
Preliminary Testing and Diagnosis
1: Preliminary Testing and Diagnosis

Step2
Transmission Tester Installation (Set-Up Procedures)
Installing the transmission tester at the transaxle connector allows separation of the vehicle electronics from transaxle electronics. Disconnecting normal vehicle electronics will set additional DTCs and cause firm shifts. (Disconnecting the transaxle connector defaults transaxle to maximum line pressure).

Note: During tester usage, additional DTCs may be set. Therefore, it is important that all codes are erased after servicing the codes. To verify elimination of all codes rerun On-Board Diagnostic.


1. Disconnect vehicle wiring harness at transaxle connector.

CAUTION: Do not attempt to pry off transaxle connector with a screwdriver. This will damage the connector and could result in transaxle concerns. If you have transaxle heat shields, remove them first. Always install heat shields after servicing transaxle.

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

CAUTION: Route interface cables away from any heat sources.

4. Install line pressure gauge into line pressure tap on transaxle.

CAUTION: Route gauge line away from any heat sources.

5. Plug transmission tester power supply plug into cigar lighter. At this time, all LEDs should illuminate for a short period and then turn off. This is the tester internal circuit check.
6. Set Bench/Drive switch to BENCH mode.

Step 3
Static Testing - Engine OFF
3: Static Testing - Engine OFF

Step 4
Dynamic Testing - Engine Running
4: Dynamic Testing - Engine Running

Step 5
Transmission Tester Removal and Clearing DTCs
5: Removing Tester & Clearing Codes