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I have a 92 chevy step van p30 with the 4l80e transmission I've replaced both speed sensors and the shift control module and the van still won't shift and the speedo is out ? Any Help thanks

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 1998 Plymouth Voyager does not shift to 3rd gear when driving,3.3

It's in limp home mode. You'll have to check wire connections and electronic controls. If it has a vacuum modulator you can remove it and look for trans fluid on the vacuum hose side (meaning ruptured diaphram). Double check the parts you replaced as well, especially if they were used parts. My dad went through three speed sensors in one year on his Caravan. You should drop the pan after checking other components. It could be a bad relay, shorted module or wire. The three speed transmissions are much more reliable than the four speed overdrive transmissions but with age and miles things can go wrong and parts will wear out.

Posted on Feb 07, 2009

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SOURCE: 92 Honda Accord, 5 speed, hard shifting into first & second gear.

First thing to do,try to pump your clutch before you shift into 1st gear then if you feel makes better, most probably you have problem with your hydraulic clutch system, check the clutch line if there is an evidence of fluid leaking or it could be internal leak.

Second thing to do, check your transmission oil, may be it' s too old or you use a thick oil thats why when cold its hard to shift then when the engine rich the normal temperature(warm) the oil become thin and the shifting will smooth. Remember the very old oil become thicken and the purity is gone and can cause of hard shifting. in this regards i suggest you to change the transmission oil and check the used oil if there is small peace of metals, then you are in big trouble,

Posted on Mar 12, 2009

michigan man
  • 3533 Answers

SOURCE: replacing output speed sensor on 2002 sonata

try autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

Posted on Mar 20, 2009

  • 57 Answers

SOURCE: Need to change the transmission filter in '99 chevy suburban 2wd.

If it has over 100,000 miles or so, don't do a complete fluid exchange. Drop the pan, change the filter, and add 2 bottles of Lucas trans. additive. No premises but it's better than a new trans. Worth a try.

Posted on May 22, 2009

warlock61
  • 659 Answers

SOURCE: won't shift out of first gear

good diagnosis that is correct if the vehicle speed sensor is not working the speedo doesnt work and the trans doesnt know when to shift

Posted on Jul 18, 2009

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Having trouble going into 4 wheel drive in a 1998 ford ranger xlt


The transfer case (7A195) is equipped with a magnetic clutch, similar to an air conditioning compressor clutch, which is located inside the transfer case adjacent to the lockup sleeve. The clutch is used to spin up the front drive system from zero to vehicle speed in milliseconds. This spin-up allows the shift between 2H and 4H to be made at vehicle speeds listed in the vehicle owner's guide. The spin-up engages the front lock hubs. When the transfer case rear and front output shaft reach synchronous speed, the spring-loaded shift collar mechanically engages the mainshaft lockup hub to the chain-drive sprocket and the magnetic clutch is then deactivated. Shifts between 4H and 4L can only occur with the transmission safety switches closed. The vehicle's speed must also be within specified limits as determined by the Generic Electronic Module (GEM).
The electronic shift control system consists of a rotary switch control system, a GEM, a transfer case shift motor (7G360) with an integral shift position sensor, a clutch pedal position switch or digital transmission range (DTR) sensor, and a brake signal input switch.
There is a control switch located on the instrument panel for fingertip shift control.

Switch Control System
When the switch on the instrument panel is turned, there is a one second delay, then the electronic control module verifies the transfer case positions (2H, 4H or 4L). Next, the GEM looks at the shift position sensor and the digital transmission range (DTR) sensor or clutch pedal position switch (depending on transmission type) and brake pedal switch. If all conditions are correct to allow the desired shift, the electronic control module will tell the transfer case shift motor to execute the shift. After the shift has been made and the transfer case shift motor is off, the control module again looks at the shift position sensor to make sure the proper shift has been accomplished. Finally, the dash indicator light on the control panel will be illuminated by a signal from the GEM indicating the desired shift has been completed.
GEM
The generic electronic module controls the operation of the transfer case in response to inputs to the rotary control by the vehicle operator, the shift position sensor, the transmission range sensor and the brake pedal switch.

Vehicle Speed Sensor (VSS)
The vehicle speed sensor (VSS) (9E731) generates an AC signal which is sent to the instrument cluster (10849). The signal is used as input to the powertrain control module (PCM) and the transmission control module (TCM).
Shift Position Sensor
The shift position sensor, an integral part of the electric shift motor, tells the GEM module the shift position of the transfer case.
Electric Shift Motor
The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary helical cam which moves the 2W-4W shift fork and 4H-4L reduction shift fork to the selected vehicle drive position.

does it jump out of gear or just doesn't go into gear in the first place ?
  • 4-Wheel Drive Transfer Case Jumps Out of Gear
  • Incomplete shift linkage travel.
  • ADJUST linkage to provide complete gear engagement. ADJUST shift gearshift lever boot.
  • Loose mounting bolts.
  • TIGHTEN mounting bolts.
  • Front and rear driveshaft slip yokes dry or loose.
  • LUBRICATE and REPAIR slip yokes as required. TIGHTEN flange yoke attaching nut to specifications.
  • Internal components.
  • DISASSEMBLE transfer case. INSPECT sliding clutch hub and gear clutch teeth for damage. REPLACE as required.

Feb 13, 2018 | Ford Cars & Trucks

1 Answer

1998 blazer 4x4 cannot get it into 4 wheel high when i pus the button th4x4 and low range lights both blink and it goes back to 2 wheel high


Transfer Case Shift Control Switch Indicator Flashes and Returns to Original Mode.
Circuit Description
This symptom usually occurs when a shift into or out of 4LOW will not occur. When the transfer case control module (TCCM) receives a request to shift into or out of 4LOW, the TCCM must see the following parameters before the shift routine can start:
?€¢
The vehicle speed must be below 3 MPH.


?€¢
The transmission must be in neutral.

If the TCCM does not see these conditions the shift control switch indicator lamp will flash for approximately 5 seconds and then return to the original gear.
Test Description
The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the operation of the transfer case shift control switch to help determine if the system is operating properly.

  2. This step determines if the vehicle speed sensor reading is correct.

  3. This step determines if the park switch reading is correct.

Switch Indicator Lamp Flashes and Returns to Original Mode
Step

Action

Value(s)

Yes

No

Schematic Reference: Transfer Case Control Schematics

1

Important: The transfer case shift control module is not a class 2 device, and therefore a scan tool can not be utilized on this transfer case.

Did you perform A Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check

2

  1. Start the engine.
  2. Place the transmission into NEUTRAL.
  3. Set the park brake.
  4. Depress each of the shift control switch buttons.

Does the transfer case range change with the press of all of the shift control switch buttons?
--
Go to
Testing for Intermittent Conditions and Poor Connections
Go to Step 3

3

Use the scan tool in order to read the vehicle speed sensor on the transmission control Data Lists.

Is the vehicle speed within the specified range?
0 km/h (0 mph)
Go to Step 4
Go to
Powertrain On Board Diagnostic (OBD) System Check for the 4.3L engine

4

  1. Put the transmission in neutral.
  2. Observe the current state of the transmission on the scan tool in the transmission control Data 2 List.

Does the scan tool indicate the transmission is in Neutral?
--
Go to Step 5
Go to
Powertrain On Board Diagnostic (OBD) System Check for the 4.3L engine

5

Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .

Did you complete the replacement?
--
Go to Step 6
--

6

Operate the vehicle within the conditions for causing the symptom as specified in the supporting text.

Does the symptom re-occur?
--
Go to Step 2
System OK

Feb 12, 2015 | 1998 Chevrolet Blazer

1 Answer

1997 Honda Odyssey shift sensor


You have a transmission fault, you need to have the Transmission control module scanned for the fault code that is in memory.

Jul 11, 2017 | Cars & Trucks

2 Answers

Where is the speedometer relay in a 1996 chevrolet van?


There is no speedometer relay. The speedometer input is provided from the vehicle speed sensor that is located in the tailshaft portion of the transmission.
This input is also used by the power train control module (or PCM) and is used as an input for transmission shifting.

Mar 31, 2010 | 1997 Chevrolet Astro

2 Answers

Shifting gears


the speed sensor is for Overdrive only, it does not shift the gears it sends the signal to the transmission control module that in turn signals the overdrive shift solenoid to engage/shift into OD.

May 11, 2009 | 1997 Dodge Grand Caravan

1 Answer

The green overdrive light on the dash keeps flashing and the transmission jerks into gear. Any suggestions on how to solve this. The test codes that come are P1747, PO156, and PO161. I have already...


not an oxygen sensor



vehicle speed sensor or oss is most likely cause.


Output Shaft Speed Sensor (OSS) 7H103: The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear that sends a signal to the powertrain control module to indicate transmission output shaft speed. The powertrain control module uses this signal for torque converter clutch control, shift scheduling, used in determining EPC pressure. Symptoms: No converter engagements, harsh shifts, abnormal shift schedules. DTC: P0720, P0721 std~us~en~file=d14110a.gif~gen~ref.gif


Vehicle Speed Sensor (VSS) 9E731: The vehicle speed sensor is a magnetic pickup that sends a signal to the powertrain control module. This VSS signal tells the PCM vehicle speed. The PCM uses this signal to modify upshift schedules. Symptoms: Shift engagement/disengagement (hunting) on grades. DTC: P0500, P0503, P1500, P1501, P1503

Mar 15, 2009 | 1996 Ford Thunderbird LX

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