1: Preliminary Testing and Diagnosis

Rotunda Transmission Tester

AX4S Overlay:

Use Rotunda Transmission Tester 007-00085 or equivalent to diagnose electronically controlled transaxles. The following instructions outline the set-up and use of this tester in the pinpoint tests for the AX4S.

Tester Jacks
1. VPWR Pin Jacks (red): VPWR test points for solenoid circuits.
2. Solenoid (TCC, EPC) Signal Line Pin Jacks (black): Signal line test points for solenoid circuits.
3. BAT+ (red) and BAT- (black) Pin Jacks: Battery reference points when measuring circuits for shorts.
4. TOT Pin Jacks: Test points for TOT sensor.
5. TSS Pin Jacks: Test points for TSS sensor.

Tester LEDs and Controls
1. Overlay and Cable Correctly Installed LEDs: Only LEDs with symbol and cable correctly match.
2. Status LEDs: LED OFF when not activated by tester (solenoid not activated, open circuit or signal line short to ground). LED "GREEN" when activated by tester and current draw is correct. LED "RED" when activated by tester and current draw is excessive (short to Battery Positive Voltage (B+). All LEDs light orange during On-Board Diagnostic.
3. Solenoid Activate Buttons: Energize respective solenoids during click testing and activate selected circuits during DRIVE mode testing.
4. Bench/Drive Switch: Selects operating mode, either BENCH or DRIVE.
5. Solenoid Select/Gear Select Switch:
Has three functions:
- In BENCH MODE: acts as shift solenoid selector for click testing.
- In DRIVE MODE: acts as forward gear selector in place of vehicle's PCM controlled shifting. Hydraulic safety mechanisms and overrides are built into the transaxle.
- In OHMS CHECK: allows you to measure ohms.

Transmission Tester Instructions
Transmission Tester Use
The Rotunda Transmission Tester 007-00085 or equivalent allows a technician to operate the electrical portion of the transaxle independent of the vehicle electronics to determine specific transaxle concerns.
The Transmission Tester usage is divided into five steps:
1. Preliminary Testing and Diagnosis
2. Installing the Transmission Tester
3. Static Testing - Engine OFF
4. Dynamic Testing - Engine Running
5. Removing the Transmission Tester and Clearing Diagnostic Trouble Codes (DTCs)

Step1
Preliminary Testing and Diagnosis
Before any diagnostic testing is done on a vehicle, some preliminary checks must be performed, as follows. Be sure to note findings, especially any DTCs found, for future reference.
- Check transaxle fluid level and condition.
- Check for add-on items (phones, computers, CB radio, etc).
- Visually inspect wiring harness and connectors.
- Check for vehicle modifications.
- Verify the shift linkage is properly adjusted.
- Verify customer concern: Upshift, Downshift, Coasting, Engagement, Noise/Vibration
- Vehicle must be at normal operating temperature.
- Perform vehicle "On-Board Diagnostics".
- Record all DTCs.
- Service all non-transaxle codes.

Step2
Transmission Tester Installation (Set-Up Procedures)
2: Installing the Transmission Tester

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