Mechanics

SATURN SL1 AXLE PROBLEM

1996 Saturn SL1

1996 Saturn SL1

manual transaxle question? Transaxle slips & jumps after driveing for abut 5min, after driveing abut 20min no reverse gears, but if left to cool reverse gears works, in the monnings everyting works.
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Ec
October 9, 2008.



Hi ec,

Thank you for the donation.

I would like some additional info to understand the situation better.

When reverse don't work, all other gears work?
Any slipping of clutch?
When you mentioned gears jump, you mean they free themselves?
Is clutch pedal high?

KHLow2008
Oct 9, 2008.
You did not understand my question sorry, my car is not a standard shift it is an automatic car and I already have a manual for it but it does not cover that transmission problem. I have changed the transmission filter and put in a transmission slip fluid but it still jumps sometimes and stay in one gear and then shoot in another gear while driving. It goes from high to low most of the time when it is hot then it fails to take reverse but if I turn off the car and let it cool for a while then it works like a dream.
I hope my question is more clear this time.

Tiny
Ec
Oct 11, 2008.
Hi ec,

Thank you for the additional info.

I have some info here which might give you a better understanding of the trans. Is thre MIL showing?

DESCRIPTION & OPERATION
Vehicles use a 4-speed, fully automatic, electronically controlled transaxle with shift mode select function and self-diagnostic function.

The transaxle uses 5 electronic valves (line actuators), controlled by the Powertrain Control Module (PCM). The PCM controls all transaxle shifts, shift feel, Torque Converter Clutch (TCC) lock-up and self-diagnostics. PCM is located behind right side of dash. PCM has two 32-pin connectors and two 24- pin connectors.

If an electrical circuit or component problem occurs, MALFUNCTION INDICATOR LIGHT (MIL) may come on or start flashing. PCM will store Diagnostic Trouble Codes (DTCs) in memory. A stored DTC indicates PCM has detected a fault in engine or transaxle circuits or components.

PCM is capable of operating in 2 different modes. The differences between the 2 modes are shift points. NORMAL mode or PERFORMANCE mode may be selected using mode switch. Mode switch is located on center console.

PCM INPUT SENSORS

ATF Temperature Sensor
Automatic Transaxle Fluid (ATF) temperature sensor is a thermistor mounted in line pressure port. PCM supplies a 5 volt reference signal to ATF temperature sensor through a resistor inside PCM and uses a signal line to measure voltage. Signal voltage will be high when transaxle fluid is cold and low when transaxle fluid is warm.

Brake Switch
Brake switch is normally closed. PCM uses this switch to determine when to apply or release TCC.

Data Link Connector (DLC)
The DLC is located under instrument panel. PCM will indicate engine and transaxle related faults by turning on MALFUNCTION INDICATOR LIGHT (MIL).

Fuel Pump Relay
When ignition is on, PCM provides a ground to fuel pump relay. When relay is energized, battery voltage is connected to the line actuators and PCM. This signal allows PCM to monitor operation of master enable relay.

Ignition Signal
Ignition signal is supplied to PCM. PCM uses this signal to determine when TCC lock-up should occur.

Mode Switch
Mode switch allows driver to select NORMAL mode or PERFORMANCE mode. When depressed, switch provides a signal to PCM. PCM will adjust shift points and TCC lock-up for mode selected.

Park/Neutral Position Switch (PNP) Signal
This signal is used by PCM to detect what position transaxle selector lever is in. If selector lever is misadjusted, shifting of transaxle will be affected.

Turbine Speed Signal
Turbine shaft speed (RPM) signal is supplied to PCM by transaxle mounted PM generator. This signal is created when turbine shaft speed is above 250 RPM.
Vehicle Speed Sensor
Vehicle Speed Sensor (VSS) sends a pulse voltage signal to PCM. PCM uses this signal to determine shift points and TCC engagement. Signal for VSS is supplied by a transaxle mounted PM generator.

PCM OUTPUT CONTROLLED DEVICES
Line Actuators Line actuators are controlled by PCM. Line actuators (duty-cycle type) open or close valve body ports inside the valve body. PCM controls line pressure with (duty -cycle type) line actuator to regulate transaxle line pressure for smooth shifting of transaxle.

Fuel Pump Relay

When ignition is on, PCM provides a ground to fuel pump relay. When relay is energized, battery voltage is connected to the line actuators and PCM.

Malfunction Indicator Light (MIL)
Malfunction Indicator Light (MIL) is controlled by PCM. The light will be on if a problem is present when ignition is on, or light will flicker on and off to indicate a problem has occurred. MIL is also used to flash engine related trouble codes.

KHLow2008
Oct 11, 2008.