1: Preliminary Testing and Diagnosis

Rotunda Transmission Tester






Use Rotunda Transmission Tester 007-00085 with AX4S Update Kit 014-00782 or 007-00087 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.

Overlays and Adapters
The following transmission tester overlays and adapters must be used with the Rotunda Transmission Tester 007-00085 or equivalent to properly diagnose the AX4S transaxle.
- Rotunda AX4S Transmission Tester Update 014-00782 or 007-00087 or equivalent
- Rotunda TR/MLP Sensor Tester Overlay 007-0086A or equivalent
- Rotunda Transmission Range (TR) Sensor Cable (MLPS Cable) 007-00086 or equivalent

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. TFT Pin Jacks: Test points for transmission fluid temperature sensor.
5. TSS Pin Jacks: Test points for turbine shaft speed sensor.

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.

Instructions
The Rotunda Transmission Tester 007-00085 with AX4S Update Kit 014-00782 or 007-00087 or equivalent allows a technician to operate the electrical portion of the transaxle independent of the vehicle electronics to determine specific transaxle concerns.
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 Inspections
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 Diagnostic.
- 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