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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

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Posted on Jan 02, 2017

  • 170 Answers

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

  • 87 Answers

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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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

2 Answers

Top speed is 45 mph


this particular year and model has problems with the transmission module. before you go on a whim... make sure your van is shifting gears. when the module goes out it will stay in second gear and not shift to other gears. watch your rpm's to see if it shifts with your speed. if the rpm's dont drop and just continue to advance your transmission is not shifting. the best option if you are not a home mechanic is to take it and have a diagnostic done. there is also the possibility that your input or output sensors are also bad. which also controls when your vehicle shifts and the speed. another thing to look for is if any of the plugs have bare wires and are grounding out. i hope this gives you a place to start..........

Jul 20, 2008 | 1996 Plymouth Grand Voyager

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