bears4x4
grease monkey
4R100 tranny
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4R100 Ford transmission: I hope no one gets intimidated by what I am trying to share.. Please feel free to ask me any thing; there are no dumb questions – just dumb answers. I am going to put this in away you can print it out to help you understand how it works. Abbreviations used by Ford
(TP)-throttle position
(IAT)-intake air temperature
(TCS)-transmission control switch
(TCIL)-transmission control indicator lamp
(TSS)-turbine shaft speed
(OSS)-output shaft speed
(TFT)-transmission fluid temperature
(VSS)-vehicle speed sensor
(TR)-digital transmission range
(BPP)-brake pedal position
(A/C)-air condition
(MAP)-manifold absolute pressure
(BARO)-barometric pressure.
Also a idle validation switch on the foot feed. Everything listed to this point is either a sensor or switch or an indicator light, they talk to the (PCM)-power control module. That in turn controls the / (TCC)-torque converter clutch / (EPC)-electronic pressure control / (SSA)-(SSB)-shift solenoids and (CCS)-coast clutch solenoid.
The PCM is programmed with a cold start strategy, this lowers the oil pressure when the engine is cold to soften the shift and it also makes it shift at a higher speeds and delays TCC lock up when cold. The temp of 160 degrees (ECT)-engine coolant temp must be met to remove this strategy. The manual also states that the TFT has some affect on the cold strategy but does not give a temp. or how much effect the trans oil temp has.
The EPC sets the oil pressure in the Trans and is regulated electrically by the PCM. From the way everything is explained in all the information I have gathered temperature is the largest factor in the level of oil pressure. The IAT and the BARO (altitude) have some bearing on the base line setting. The MAP is a load signal and will make the pressure rise as more loads are applied. I could not find a normal operating temp for the trans oil any where for Ford, how ever I did find that Dodge states that normal temp is 180 degrees. I did learn that Chrysler developed the cold start strategy first and Ford copied it. The TCS and the TCIL are the overdrive switch and the light in the gear shift that shows OD on or off, if this light starts to blink at you, this is a call that the EPC is shorted or the circuit is faulty. The BPP or BOO as sometimes called will cancel the TCC if applied. The TR is the switch, which tells the PCM what gear you have selected.
Line pressure for a normal warm condition is
P&N 50 – 65
(R) 70 – 100 idle and 213 –223 stall
(D) & 2nd 50 -65 idle 136 – 156 stall
(1st) 70 – 100 idle 136 – 156 stall.
CAUTION IF YOU TEST PRESSURES YOURSELF – DON’T HOLD STALL FOR MORE THEN A FEW SECONDS.
As you can see, there are a lot of different imputes that can and will change the way your trans. will shift. There are after market shift kits that can and will improve shift quality, and there are after market add-on units that will lie to the PCM and raise the oil pressure. This will also give you a better shift. If you have tried the electric add-on units like the Banks Trans command and it didn’t help, then you unit is running in a pre set factory setting which is a safe mode. That means that one of the signals which are needed to ensure proper operation is either missing or not stable. I hope you enjoy and benefit from this post. MARRY CHRISTMAS Mike OB original guy who wrote this
________________________________________
4R100 Ford transmission: I hope no one gets intimidated by what I am trying to share.. Please feel free to ask me any thing; there are no dumb questions – just dumb answers. I am going to put this in away you can print it out to help you understand how it works. Abbreviations used by Ford
(TP)-throttle position
(IAT)-intake air temperature
(TCS)-transmission control switch
(TCIL)-transmission control indicator lamp
(TSS)-turbine shaft speed
(OSS)-output shaft speed
(TFT)-transmission fluid temperature
(VSS)-vehicle speed sensor
(TR)-digital transmission range
(BPP)-brake pedal position
(A/C)-air condition
(MAP)-manifold absolute pressure
(BARO)-barometric pressure.
Also a idle validation switch on the foot feed. Everything listed to this point is either a sensor or switch or an indicator light, they talk to the (PCM)-power control module. That in turn controls the / (TCC)-torque converter clutch / (EPC)-electronic pressure control / (SSA)-(SSB)-shift solenoids and (CCS)-coast clutch solenoid.
The PCM is programmed with a cold start strategy, this lowers the oil pressure when the engine is cold to soften the shift and it also makes it shift at a higher speeds and delays TCC lock up when cold. The temp of 160 degrees (ECT)-engine coolant temp must be met to remove this strategy. The manual also states that the TFT has some affect on the cold strategy but does not give a temp. or how much effect the trans oil temp has.
The EPC sets the oil pressure in the Trans and is regulated electrically by the PCM. From the way everything is explained in all the information I have gathered temperature is the largest factor in the level of oil pressure. The IAT and the BARO (altitude) have some bearing on the base line setting. The MAP is a load signal and will make the pressure rise as more loads are applied. I could not find a normal operating temp for the trans oil any where for Ford, how ever I did find that Dodge states that normal temp is 180 degrees. I did learn that Chrysler developed the cold start strategy first and Ford copied it. The TCS and the TCIL are the overdrive switch and the light in the gear shift that shows OD on or off, if this light starts to blink at you, this is a call that the EPC is shorted or the circuit is faulty. The BPP or BOO as sometimes called will cancel the TCC if applied. The TR is the switch, which tells the PCM what gear you have selected.
Line pressure for a normal warm condition is
P&N 50 – 65
(R) 70 – 100 idle and 213 –223 stall
(D) & 2nd 50 -65 idle 136 – 156 stall
(1st) 70 – 100 idle 136 – 156 stall.
CAUTION IF YOU TEST PRESSURES YOURSELF – DON’T HOLD STALL FOR MORE THEN A FEW SECONDS.
As you can see, there are a lot of different imputes that can and will change the way your trans. will shift. There are after market shift kits that can and will improve shift quality, and there are after market add-on units that will lie to the PCM and raise the oil pressure. This will also give you a better shift. If you have tried the electric add-on units like the Banks Trans command and it didn’t help, then you unit is running in a pre set factory setting which is a safe mode. That means that one of the signals which are needed to ensure proper operation is either missing or not stable. I hope you enjoy and benefit from this post. MARRY CHRISTMAS Mike OB original guy who wrote this
