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Tranny do not shift into third gear with a signal indicating tranny needing service

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Check the shift solenoid and the vehicle speed sensor with a voltmeter one is broken or malfunctioning

Posted on Sep 14, 2010

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Posted on Jan 02, 2017

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Electronic pressure control solenoid circuit p1745. Check engine light on 2000 ford escort, 4cl, automatic. Advance auto told me it was a dealer part but I can't find it on any of the ford websites?...


Here is what the service manual says about the EPC solenoid, the processor looks at allot of different inputs to command the solenoids, such as Throttle Position Sensor, Vehicle Speed Sensors, Transmission Range Sensor and RPM signal, The PCM controls the shift patterns for the transmission. Electronic Pressure Control (EPC) Solenoid
The electronic pressure control (EPC) solenoid is located on the main control valve body and is controlled by the PCM. The EPC controls line pressure used to apply and release clutches and bands in the transmission.
The 2-3 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 2-3 shift solenoid activates the 2-3 shift valve which controls the automatic shifting between second and third gear. Second gear is established when the 2-3 shift solenoid is switched on. The 2-3 shift solenoid is switched off when vehicle speed increases and requires a second to third gear upshift.
The 3-4 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 3-4 shift solenoid activates the 3-4 shift valve which controls the automatic shifting between third and fourth gear. Third gear is established when the 3-4 solenoid is switched off. The 3-4 shift solenoid is switched on when vehicle speed increases and requires a third to fourth gear upshift.

Mar 23, 2013 | Cars & Trucks

1 Answer

Transmission (1994 astro van ) shifts fine sometimes and other times feels like it stuck in 4th gear. i changed the filter and flushed the trans.Whats up with that?


Its more likely the tranny shift solenoids or the power wire going to the tranny. If the tranny loses its ignition feed (12Volts) it will default into limp home mode. This means neither shift solenoid has power and will be in the off position. When both shift solenoids are in the off position this is normally third gear. It will be very labored taking off from a stop being in third gear, but will allow you to still move (thus limp home). Astro vans were not known for it, however full size pickups with the same engine and tranny, would experience a bad ignition switch. It would disable the tranny circuit and no power would get to it, same symptoms. If it sometimes works it won't be a bad fuse, best to have it diagnosed at a reliable transmission shop to verify. Its not as expensive as a tranny overhaul.

Feb 26, 2011 | 1994 Chevrolet Astro

1 Answer

I'm having problems with my trans in my 95 suburban. Sometimes when I start it my tach and the shift indicator lights don't light up. When this happens the trans feels as thou Im starting in second or...


there is a sensor on the tranny called nsbu neutral saftery back up switch. this tells the computer what gear the tranny is in when to shift, and controls the indicator lights get it fixed before you damage the tranny

Sep 23, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Tranny wont shift into third gear.


you have to pull down the oil pan of the tranny. then take out the strainer inside attached to the tranny. dirt is clogging it making the sometimes shift and other not.

Apr 22, 2009 | 1984 Nissan Maxima

3 Answers

1999 ford expedition - transmission slip?


the flashing O/D light usually means you have a bad speed sensor that sends speed info to the engine & trans computer.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.
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Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

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Some trans use an OSS, Output Shaft Sensor instead of a VSS. Depends on which trans you have, 4R100 or 4R70W

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module (PCM) to allow automatic shifts from first through fourth gears or first through third gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.

The TCIL indicates overdrive cancel mode activated (lamp on) and electronic pressure control (EPC) circuit shorted (lamp flashing) or monitored sensor failure.

Output Shaft Speed (OSS) Sensor
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 (PCM) to indicate transmission output shaft speed. The OSS is used for torque converter clutch control, shift scheduling and to determine electronic pressure control.

Apr 18, 2009 | 1998 Ford Expedition

1 Answer

NO SECOND GEAR IN TRANNY


sounds like what happened to my camaro. it sounds like a stuck valve. i suggest taking it in for an estimate at a transmission specialist.

Mar 18, 2009 | 1996 Chevrolet K1500

1 Answer

Automatic tranny gets hungup between 2nd and third gear.


possible governor problem;
this part or group regulates the fluid pressures during changing loads.

Jan 22, 2009 | 1995 Audi 90

3 Answers

Chevy venture 2004 Transmission


Bring to tranny shop or repair shop, have it scanned for trouble codes, many electrical parts and solonoids in those trannys, possible it may just be a shift solonoid bad or needs adjustment, much cheaper than replacing tranny. good luck!

Sep 07, 2008 | 2004 Chevrolet Venture Passanger

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