Tester Description

DESCRIPTION
NOTE: Use the AODE transmission tester overlay to diagnose the 4R70W transmission.

Use Transmission Tester to diagnose electronically controlled transmissions. The following instructions outline the set up and use of this tester in the pinpoint tests for the 4R70W.





OVERLAYS AND ADAPTERS
When the overlay and cable are correctly installed, only LEDs with the (O) symbol will light when the overlay symbol and cable correctly match.

TESTER JACKS
1. VPWR pin jacks (red): VPWR test points for solenoid circuits.
2. Solenoid (MCCC, EPC) signal line pin jacks (black): Signal line test points for solenoid circuits.

NOTE:The tester overlay is labeled for the MCCC solenoid. This is used to test the Torque Converter Clutch (TCC) solenoid.

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 (TFT) sensor.
5. OSS Pin Jacks: Test points for output speed shaft sensor (OSS).

LEDs AND CONTROLS
1. Status LEDs: LED is off when not activated by tester (solenoid not activated, open circuit or signal line short to ground). LED is green when activated by tester and current draw is correct. LED is red when activated by tester and current draw is excessive (short to battery positive [B+] voltage). All LEDs are orange during Self-Test.

2. Solenoid Activate Buttons: Energize respective solenoids during click testing and activate selected circuits during drive mode testing.
3. Bench/Drive Switch: Selects operating mode, either BENCH or DRIVE.
4. Solenoid Select/Gear Select Switch: Has three functions:
- BENCH mode: acts as shift solenoid selector for click testing.
- DRIVE mode: acts as forward gear selector in place of vehicle PCM controlled shifting. Hydraulic safety mechanisms and overrides are built into the transmission.
- OHMS CHECK: measures resistance (ohms).

INSTRUCTIONS
The Transmission Tester allows the operation of the electrical portion of the transmission, independent of the vehicle electronics, to determine transmission concerns.

The transmission tester usage is divided into six steps:
1. Preliminary inspections.
2. Installation procedures.
3. Static testing - engine OFF.
4. Dynamic testing - engine ON.
5. Digital Transmission Range (DTR) sensor testing.
6. Disconnecting the tester.