SERVICE INFO. ON AUTOMATIC TRANSAXLE ACTUATOR CHECK. Saturn Saturn 1995

For 1990-2009 cars

# SERVICE INFO. ON AUTOMATIC TRANSAXLE ACTUATOR CHECK

#### SUBJECT: Service Information on 1995 Automatic Transaxle Actuator Quick Check

#### MODELS AFFECTED: 1995 Saturns equipped with MP6/MP7 automatic transaxles

PURPOSE: The purpose of this bulletin is to inform the technician about the differences in the automatic transaxle actuator quick check procedure for 1995 vehicles and to add a step to the procedure that was not included in the 1995 "Automatic Transaxle" and "General Information/Fasteners/Specifications" service manuals.

The procedure for performing the valvebody actuator quick check on 1995 vehicles has been modified from the procedure used on previous year Saturns. In previous years, a master enable relay was used to power the actuators when the ignition key was turned to Run. In 1995, power to the actuators is received through the fuel pump relay, which is only powered up for five seconds when the ignition key is turned to Run. (After engine is started, the fuel pump relay is powered up again.)

Since the fuel pump relay is only powered up for five seconds with ignition key turned to Run (and engine Off), a jumper must be supplied from the BODY fuse when testing the actuators.

If the test is attempted without installing the jumper wire from the BODY fuse to the fuel probe hole, an error message "MODE 4 REQUEST REJECTED" will appear on the portable diagnostic tool. If this message appears, supply voltage to the fuel probe hole and re-test.

To prevent damage to the fuse terminal use an appropriate size flat spade male connector. Appropriate jumper wires can be found in the Saturn Connector Test Adapter Kit SA92067.

This test can be performed with or without using a portable diagnostic tool. Both actuator quick check procedures are described in the 1995 "Automatic Transaxle" and "General Information/Fasteners/Specifications" service manuals. However, a step was excluded from "Test Section Diagnosis" section of the "1995 Automatic Transaxle Service Manual" and the "Specifications" section of the "1995 General Information/Fasteners/Specifications Service Manual."

Refer to the following "Audible Quick Check For Actuators Without Using The Portable Diagnostic Tool" procedure in this bulletin and add the highlighted step (step 3) to the appropriate procedures in the "Test Section Diagnosis" section ("1995 Automatic Transaxle Service Manual") and in the "Specifications" section ("1995 General Information/ Fasteners/ Specifications Service Manual").

AUDIBLE QUICK CHECK FOR ACTUATORS WITHOUT USING THE PORTABLE DIAGNOSTIC TOOL

#### Procedure:

1. Remove the 10A-#15 body fuse, located in the instrument panel junction block.

2. Using the flat spade male connectors from the Saturn Connector Test Adapter Kit SA92067, jump the fuel pump probe hole to the B+ terminal of the body fuse.

3. Ground diagnostic enable. Jumper DLC terminal A to B.

4. Key On, engine Off, move gear selector to position to check desired actuator.

Actuator Select

2nd Actuator 2

3rd Actuator 3

4th Actuator 4

TCC Actuator R

Line Actuator N

When the gear selector is moved to the corresponding position, the PCM will pulse width modulate (PWM) the actuator at a set duty cycle for about six seconds. Listen and compare the noise of the suspected bad actuator to that of the other actuators. They should all be similar. If the noise coming from the suspected bad actuator is faint or not present, replace the actuator.

#### IMPORTANT: Prior to replacing any actuator, check all connections at the actuator and connector plate.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.