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Diagnostic Trouble Code (DTC) 634 indicate the Transmission Range (TR) sensor is out of Self-Test range when the gear selector is in "PARK".
DTCs 522 and 654 indicate the gear selector was not in Park during Self-Test.
Possible causes:
•Misadjusted linkage.
•Open or short in harness circuits.
•Damaged TR sensor.
•Damaged Powertrain Control Module (PCM) .
OR CHECK THIS OUT
TECHNICAL BULLETIN # 230A
TRANSMISSION: E4OD
SUBJECT:
No upshift 4th gear starts, harsh upshifts, neutrals out after shifts
APPLICATION: Ford-E/F Series, Bronco
DATE: Jan 1995
E4OD
No Upshifts, 4th Gear Starts, Harsh Upshifts, Neutrals Out After Shifts
NOTE: Click on image to make it larger.
All of these concerns can be the result of an inappropriate Manual Lever Position (MLP) sensor signal. The MLP sensor consists of six resistors connected in series (ganged).
The resistance of the MLP sensor will vary based on which range the transmission is in. The MLP circuit can be checked using the following steps.
(Step 1)
Check the MLPS ground: Turn the ignition on. The voltage on pin 46 (sensor ground ) should not exceed .1v. If the voltage is excessive, add an additional ground to the existing ground wire (figure 2).
NOTE: Click on image to make it larger.
Figure 2 Splice an additional ground from the existing ground wire to a known good ground.The negative post of the battery is the best. This view is of the pins of the MLP connector pins.
NOTE: Click on image to make it larger.
(Step 2)
Check the MLPS voltage: The voltage at pin 30 should vary-in increments- according to the position of the manual lever (figure 3).
MLP voltage (ignition on) should be within 20% of these specifications.
Note It is recommended that you use a break-out box. If a break-out box is not available, you will need to pierce the wires to pins 30 and 46 for these tests.
NOTE: Click on image to make it larger.
(Step 3)
Check the resistance of the MLPS: The resistance of the MLPS (pins 30 and 46) should change-in increments-with the position of the manual lever (figure 4).
Note If this test is being done with a break-out box, disconnect the computer first (make sure the ignition is off). If this test is being done without a break-out box, disconnect the MLPS from the vehicle harness.
Note Testing beyond this point will include tests of the harness. Consult the appropriate repair manual for this.
Transmission range sensor.
Transmission Range Sensor - Below center of vehicle, LH side of transmission.
The Transmission Range (TR) sensor provides an input signal to the Powertrain Control Module (PCM) , notifying the PCM of the current transmission shift lever position.
NOTE: click on image to make it larger.
CONSTRUCTION
The TR sensor has six separate resistors in series. Each resistor has an output connection corresponding to a transmission position (P, R, N, D, 1, 2). The output wiper arm is linked directly to the transmisssion selector linkage.
OPERATION
The PCM applies a 5.0 volt reference signal to the TR circuit pin 30. SIG RTN circuit pin 46 supplies a ground path to the sensor. As the transmission is shifted the TR sensor output wiper arm moves to a corresponding resistor connection. The six inline resistors provide a separate voltage drop for each transmission position.
RELATED DIAGNOSTIC TROUBLE CODES
DTC 634 - The TR sensor was out of self-test range with the transmission in park.
DTC 522/654 - The gear selector was not in park during the self-test.
Click on pic to enlarge it.
PURPOSE
Used as an input to determine shift schedule and Electronic Pressure Control (EPC) for temperature effects.
DESCRIPTION
The Transmission Fluid Temperature (TFT) sensor is a temperature-sensitive device called a thermistor it is located in the solenoid body assembly it sends a voltage signal to the Powertrain Control Module (PCM) . The voltage signal varies with the transmission fluid temperature.
OPERATION
The PCM uses the voltage signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule lowers shift speeds to allow for the reduced performance of cold engine operation. The TFT is part of the transmission solenoid assembly and is not replaced separately.
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