1: Preliminary Testing and Diagnosis

Rotunda Transmission Tester
Use Rotunda Transmission Tester 007-0085C 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 AX4N.

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 TFT sensor.
5. TSS Pin Jacks: Test points for TSS sensor.

Tester LEDs and Controls

AX4N Tester LEDs and Controls:

1. Overlay and Cable Correctly Installed LEDs:
a. Only LEDs with the (0) symbol will not light when the overlay and cable match correctly
2. Status LEDs:
a. LED OFF when not activated by tester (solenoid not activated, open circuit or signal line short to ground).
1. LED green when activated by tester and current draw is correct.
2. LED red when activated by tester and current draw is excessive (short at VPWR).
3. All LEDs light orange during self-test.
3. Solenoid Activate Buttons:
a. Energize respective solenoids during click testing and activate selected circuits during DRIVE mode testing.
4. Tester Mode Switch:
a. Selects operating mode, either BENCH or DRIVE.
5. Solenoid Select/Gear Select Switch:
a. Has three functions:
1. BENCH mode: acts as shift solenoid selector for click testing.
2. 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.
3. OHMS check: allows you to measure ohms and to check for presence of a diode on specific solenoids.

Transmission Tester Instructions Transmission Tester Use

The Rotunda Transmission Tester 007-0085A 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)

Step 1
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 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