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How to change relay for shifting - 1992 Volvo 940

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To gain access to the relays, you need to remove the ashtray housing.
2 small screws on the cigar lighter, and it'll just pop out.
Hope that helps.

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

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2001 Pontiac Bonneville won't shift out of park


Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
?€¢
The automatic transmission shift lock control solenoid


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The automatic transmission shift lock control switch


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The brake to shift relay


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The rear integration module (RIM)

With the ignition in the ON position, battery positive voltage is supplied to the brake to shift relay coil. When the RIM energizes the brake to shift relay, the brake to shift relay switch contacts close suppling battery voltage to the automatic transmission shift lock control switch. The circuit continues through the normally --closed switch to the automatic transmission shift lock control solenoid. The permanently grounded solenoid is energized. This locks the shift linkage in the PARK position. When the driver presses the brake pedal, the contacts in the automatic transmission shift lock control switch open. This causes the automatic transmission shift lock control solenoid to release. This allows the shift lever to move from the PARK position.
Shift Lever Does Not Move with Brake Pedal Depressed ?

Jun 30, 2015 | Pontiac Cars & Trucks

1 Answer

05 Ford Escape wont shift out of park. Brake light works and shift lock solenoid releases when 12v is applied to the coil at the connector. Red wire has 2v at all times and increases to 4v when key is...


You may need a shop manual for this.
There is a smart junction box that contains some mini-relays that controls the shift lock solenoid.
The junction box is controlled by the engine and body computers.
That red wire comes from the junction box.

Sep 25, 2013 | Ford Escape Cars & Trucks

2 Answers

I have a 94 Jaguar xj6. the transmission light is on. it shifts hard in maybe 1st and 2nd gear. I've changed the transmission ecu, transmission relay, and fuses that have to do with the gearbox.


Change the xmission fluid and filter. If that doesnt fix it, it could be the solenids, the soleniod pack, what evey they call it on a Jag.

Sep 25, 2012 | 1994 Jaguar XJ6

1 Answer

I changed the 3-4 shift soleniod but now i dont have any gear but 2nd and before we had 1-3 just not over drive. what could have went wrong?


There is no code that tells you to replace the shift sdolenoid. There is a code (P0783) That has a generic description of "3-4 Shift Malfunction". Please note that there are several things that can cause this code. This code DOES NOT mean to replace the shift solenoid without first diagnosing the other possible causes of this code.
P0753 is for the "3-4 Shift Solenoid/Transmission Relay Circuit" If this is the code you had, please note that this code is a CIRCUIT code. The circuit includes the 3-4 shift solenoid, the transmission power relay and all the the wires and connectors connecting the power relay, the solenoid, and the PCM together. In this case the CIRCUITS must be diagnosed prior to replacing ANYTHING.

With all that said, is there now, or was there originally any other codes in the system besides one of these? If so, what are/were they? It is possible that there is a relay fault that is causing ALL of the shift solenoids to malfunction. It is also possible that there is low line pressure causing your no-shifting problem. Then there is the question: Are you absolutely certain that you replaced the correct solenoid?

I have also seen the shifting problems worsen due to misdiagnosis. Example: the power relay is causing the problem...the 3-4 shift solenoid gets changed...the transmission valve body is now full of air because the transmission was drained and the shift solenoid was removed from the valve body causing the valve body to drain...everything gets put back together and the transmission fluid is replaced....Now the transmission will not shift in any gear because the valve body cannot purge the air due to the solenoids being inoperative. They were inoperative in the first place and are still inoperative because the wrong part got replaced. PROPER diagnosis and repair will get everything working again.

I would recommend starting over to see what codes you now have and diagnose the system accordingly.

Sep 23, 2011 | 1999 Dodge Durango

1 Answer

Cooling fan stays on will not shut off makes the car shift real hard where is the relay switch so i can check it thanks


cooling fan relay is in the fuse and relay box which sits behind the driver side headlight in the S series.
you know if your a/c is on, the fan runs constantly anyway? i do not think making the fan stay off is going to change anything about the way the car shifts.

Jul 21, 2011 | Saturn L300 Cars & Trucks

2 Answers

4wd does not work


Electronic Shift On the Fly (ESOF) Operation
The ESOF system is an electronic shift 4x4 system that allows the operator to choose between two different 4x4 modes as well as 2-wheel drive. The operator can switch between 2WD and 4WD HIGH mode at speed. To engage or disengage LOW Range, the vehicle speed must be less than 5 kph, the brake depressed, and the transmission must be in NEUTRAL.

The transfer case is equipped with an electromagnetic clutch which is located inside the case. This clutch is used to spin up the front drive-line when shifting from 2WD to 4x4 High mode at speed. When the control switch on the instrument panel is turned, the generic electronic module (GEM) recognizes that a shift has been requested and activates the electromagnetic clutch and the relays which power the transfer case shift motor. When the shift motor reaches the desired position as determined by the contact plate position inputs to the GEM, power to the shift relays and motors will be removed. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the main-shaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.

Shift Between 2WD and 4x4 HIGH:
Shifts between 2WD and 4x4 HIGH can be made at speed. Listed below are the inputs and outputs needed by the GEM to execute a change between any of these modes.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*Transfer Case Clutch Relay (grounded when relay is on, open circuit when relay is off).
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (ground when activated, open circuit when deactivated).

Shifting Into/Out of 4WD LOW:
When shifting into or out of 4WD LOW, the GEM requires that the vehicle speed be less than 5 kph, the brake is applied, and the transmission is in NEUTRAL.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).
*VSS Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
Brake Input (battery voltage when brake is depress, open circuit when not activated).
*Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
8Start/Clutch Depressed Input

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (grounded when activated, open circuit when deactivated).

4WD Mode Switch
A rotary switch allows the vehicle operator to choose between 2WD, 4WD HIGH, and 4WD LOW modes of 4x4 operation.

GEM Module
The Generic Electronic Module (GEM) controls the operation of the 4x4 system

Vehicle Speed Sensor
The vehicle speed sensor (VSS), mounted in the rear of the transfer case, informs the GEM of the vehicle speed.

Transfer Case Shift Motor Sense Plates

The shift motor sense plate, an integral part of the electric shift motor, informs the GEM to the positions of the transfer case

Transmission Range Sensor
Located on the left side of the transmission, this sensor informs the GEM when the transmission is in the NEUTRAL position.

Electric Shift Motor
The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary cam which moves the mode fork and range fork within the transfer case to select between the 2WD, 4WD HIGH, and 4WD LOW positions.

4x4/4x2 Vacuum Solenoids
These two solenoids are attached to the upper RH side of the engine compartment dash, and alternately route vacuum to the vacuum motor which engages/disengages the center axle disconnect collar in the front axle assembly.

4x4 Shift Motor Relay
A module containing two relays which under the control of the GEM, shift the transfer case shift motor between the 2WD, 4WD HIGH, and 4WD LOW modes.

Transfer Case Clutch Relay
An electromechanical relay is used to activate the transfer case clutch within the transfer case.

Good luck and hope this helps,but start with the simple and check the fuses and wire harness. Both white/light blue stripe wires should have 12V in run. The GEM will ground the left side (closest to engine) solenoid to disengage the front axle. It will ground the the right side solenoid (closest to fender) to engage the front axle. If the GEM doesn't see Neutral it will not let the truck come out of 4Lo. If the GEM had water leaking on it it may well be the root of the problem. The shift motor only has power when the GEM sends it a signal to move the shift lever. Once the shift is completed the motor shuts off. There are 2 wires that control the shift motor. A yellow and an orange. The GEM alternates between 12v and Ground to these wires to control which way the motor turns. The GEM uses the transfer case shift relay module to control the power to the motor. There are contact plates inside the shift motor assembly that indicate the position that the shift lever is in. This is what the GEM used to know what the T-case is doing. Any one of these components can fail.







Jan 10, 2010 | 2002 Ford Explorer

2 Answers

1992 240 Volvo automatic transmission won't shift out of 3rd gear


Check the transmission filter, may be clogged up, do not change the oil, keep the same oil when replacing filter, trust me to avoid transmission repair.

Jul 09, 2009 | 1991 Volvo 240

2 Answers

GEAR SHIFT INDICATOR LIGHT 2006 FORD EXPLORER


I had the same problem. They need to change the whole shift indicator assembly. Had mine fixed inn 30 minutes

Jan 27, 2009 | 2006 Ford Explorer

2 Answers

Shift solenoid relay.. internal or external?


Trans model is the 4L60E,and the shift solenoids are mounted on the valve body,just inside the bottom pan.There are 2 shift solenoids,one EPC solenoid (Electronic Pressure Control)One TCC PWM solenoid (Torque Convertor Clutch,Pulse Width Modulated),one 3-2 kickdown solenoid,and a manifold pressure switch.As far as a shift solenoid relay switch,i have never heard of that.The power for the transmission solenoids comes through the ignition switch ,and uses a fuse,not a relay.Accessing the solenoids only requires dropping the bottom pan,and the valve body does not have to be removed,to change the solenoids.The shift solenoids are the TWO solenoids right side by side and look identical..They are the only two solenoids inside the pan that are in fact identical.Good luck.

Sep 28, 2008 | 1996 Oldsmobile Bravada

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