PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR

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May Malone
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1 PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR NOTE: Refer to the Transmission Vehicle Harness Connector illustration preceding these pinpoint tests. NOTE: This vehicle is equipped with a transmission fluid temperature gauge in the dash. The transmission fluid temperature gauge may be used as a quick reference to the operating temperature. It should not be used as a diagnostic tool to tell the temperature of the transmission. The WDS, NGS or transmission tester should be used to obtain the actual temperature of the transmission. B1 ELECTRONIC DIAGNOSTICS Test Step Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in the connector and in good condition before proceeding. Connect the diagnostic tool. Key in ON position. Select Diagnostic Data Link. Select PCM. Select PID/Data Monitor and Record. Enter the following diagnostic mode on the diagnostic tool: PIDs; TFT, TFTV. Does the vehicle enter PID/Data Monitor and Record? B2 WARM-UP/COOL-DOWN CYCLE While monitoring the TFT PIDs, carry out the following test: If transmission is cold, run transmission to warm it up. If transmission is warm, allow transmission to cool down. Do the TFT PIDs increase as the transmission is warmed up or decrease as the transmission is cooled or does the TFT or TFTV drop in and out of range? Result / Action to Take Yes REMAIN in PID/ Data Control. GO to B2. No REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to the Powertrain Control/ Emissions Diagnosis (PC/ED) manual for diagnosis of PCM. Yes If the TFT PIDs increase as the transmission is warmed or decrease as the transmission is cooled, CLEAR all DTCs. ROAD TEST to verify if concern is still present. If concern is still present, REFER to Diagnosis By (1 of 6) [4/20/2008 6:15:37 PM]

2 Symptom in this section to diagnose transmission overheating. If the TFT or TFTV drop in and out of range, INSPECT for intermittent concern in the internal/external harness, sensor or connector. No GO to B3. B3 CHECK THE ELECTRICAL SIGNAL OPERATION Key in OFF position. Disconnect: Transmission Connector. CAUTION: Remove the heat shield, if so equipped, from transmission before removing the connector. Remove the solenoid body connector by pushing on the center tab and pulling on the harness connector. Do not attempt to pry the tab with a screwdriver. Always reinstall the heat shield when the procedure is completed. Use a mirror to inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals. Measure the voltage between TFT signal circuit pin 7 and the SIG RTN circuit pin 8 at the transmission harness connector. Yes GO to B7. No GO to B4. Place the VOM on the 20-volt scale. Key in ON position. Is the voltage between 4.75 and 5.25 volts? (2 of 6) [4/20/2008 6:15:37 PM]

3 B4 CHECK THE CONTINUITY OF THE TFT SIGNAL AND SIG RTN CIRCUITS Key in OFF position. Disconnect: Powertrain Control Module (PCM). Inspect for damaged or pushed-out pins, corrosion or loose wires. Install the EEC-V Control System Breakout Box. Measure the resistance between the PCM signal test pin 37 at the EEC-V Control System Breakout Box and the signal pin 7 at the transmission harness connector. Yes GO to B5. No REPAIR the open circuits. REMOVE the EEC-V Control System Breakout Box. RECONNECT all of the components. REPEAT the Quick Tests. Measure the resistance between the PCM SIG RTN test pin 91 at the EEC-V Control System Breakout Box and the SIG RTN pin 8 at the transmission harness connector. Is each resistance less than 5 ohms? B5 CHECK THE TFT SIGNAL CIRCUIT FOR SHORT TO VPWR AND GROUND (3 of 6) [4/20/2008 6:15:37 PM]

4 Measure the resistance between the PCM signal test pin 37 and VPWR test pins 71 and 97 at the EEC-V Control System Breakout Box. Yes GO to B6. No REPAIR the short circuit(s). REMOVE the EEC- V Control System Breakout Box. RECONNECT all of the components. REPEAT the Quick Tests. Measure the resistance between the PCM signal test pin 37 and test pins 51, 76, 77, 103, 91 at the EEC-V Control System Breakout Box and chassis ground. Is each resistance greater than 10,000 ohms? B6 CHECK THE RESISTANCE OF THE TFT SENSOR Install the Transmission Tester to the transmission connector. Set the bench/drive switch to the BENCH mode. Rotate the gear select switch to the OHMS CHECK position. NOTE: While carrying out Tests 1 and 2 below, observe resistance. DTC P0713 is set if the resistance value exceeds 1,062 ohms (open circuit). DTC P0712 is set if the resistance value falls below 597 ohms (short circuit). Measure the resistance between the TFT- jack and the TFT+ jack on the tester. Yes GO to B7. No INSTALL a new solenoid assembly. RECORD and ERASE the codes. REPEAT the Quick Tests. (4 of 6) [4/20/2008 6:15:37 PM]

5 TEST 1 Record the resistance. Resistance should be approximately in the following ranges: Transmission Fluid Temperature C F Resistance (Ohms) -40 to to -4 1,062 k-284 k -19 to k-100 k k-37 k k-16 k k-5 k k-2.7 k k-1.5 k k-0.8 k k-0.54 k TEST 2 Check for an intermittent short or open. If the resistance was between 0.8 k and 100 k ohms, carry out the following test. If the transmission is cold, start and run the engine until transmission reaches its normal operating temperature. If the transmission is warm, allow the transmission to cool. Check the TFT sensor resistance again. Compare the resistance with the initial resistance. The resistance should decrease if the transmission was warmed and should increase if the transmission was allowed to cool. If the correct change in resistance occurs, repeat the Quick Test. Is the resistance in the specified range? B7 CHECK THE TFT SENSOR FOR SHORT TO GROUND (5 of 6) [4/20/2008 6:15:37 PM]

6 Check for continuity between the BAT(-) jack (engine ground) and the appropriate jack (-TFT or +TFT) with a digital ohmmeter or other low current tester (less than 200 milliamps). Connection should show infinite resistance (no continuity). Does the connection show continuity? Yes INSTALL a new solenoid assembly. REPEAT the Quick Tests. No INSTALL a new PCM. REPEAT the Quick Tests. If the DTC is still present and overtemp condition exists, CHECK the fluid condition. CHECK the overheat condition. REFER to Diagnosis By Symptom in this section. REPAIR as required. REPEAT the Quick Tests. (6 of 6) [4/20/2008 6:15:37 PM]

7 Main Control Valve Body Accumulator Body, Solenoid Body View (678 KB) Printable Material Item Silicone Brake Caliper Grease and Dielectric Compound XG-3 Specification ESE-M1C171-A Removal 1. Position the vehicle on a hoist. For additional information, refer to Section Disconnect the solenoid body electrical connector. 3. NOTE: Do not discard the fluid pan gasket unless damaged. This is a reusable gasket. Remove the transmission fluid pan and gasket. 1. Loosen, but do not remove the bolts. 2. Remove the front and side bolts. 3. Lower the front of the fluid pan and allow the fluid to drain. 4. Remove the remaining fluid pan bolts and the fluid pan. (1 of 17) [4/20/2008 6:16:16 PM]

8 4. CAUTION: If the seal remains in the pump bore, remove it carefully with a small screwdriver so as not to scratch or damage the aluminum bore. NOTE: After removal, discard the filter and seal assembly. Remove the filter and seal assembly by carefully pulling and rotating the filter as necessary. 5. Remove the accumulator body. 1. Remove the bolts. 2. Remove the nuts. 3. Remove the accumulator body. (2 of 17) [4/20/2008 6:16:16 PM]

9 6. CAUTION: Prevent the front of the valve body separator plate from sagging and displacing the check balls. If the valve body separator plate is not being serviced: 1. Remove the bolt. 2. Install the bolt into any case-threaded bolt hole on the opposite end of the separator plate. (3 of 17) [4/20/2008 6:16:16 PM]

10 7. Remove the main control valve body assembly. 1. Remove the bolts. 2. Remove the nuts. 3. Remove the main control valve body. (4 of 17) [4/20/2008 6:16:16 PM]

11 8. Remove the solenoid body assembly. 1. Remove the bolts. 2. Remove the nut. 3. Remove the solenoid body assembly. 9. Remove the solenoid screen assembly by rotating and pulling. (5 of 17) [4/20/2008 6:16:16 PM]

12 10. CAUTION: The steel electronic pressure control (EPC) check ball is spring-loaded under the valve body separator plate. NOTE: If the valve body separator plates are not to be serviced, proceed to installation procedure. Remove the valve body separator plate reinforcement. 1. Remove the bolts. 2. Remove the separator plate reinforcement. (6 of 17) [4/20/2008 6:16:16 PM]

13 11. Lower and remove the valve body separator plate and gaskets. The rubber check balls and the steel EPC check ball and spring assembly will fall out and may become lost or stick to the worm trail of the case. Remove and discard separator plate gaskets. Installation CAUTION: Using the incorrect gaskets can cause damage to the transmission. 1. NOTE: Refer to parts catalog for correct gasket usage. NOTE: If the valve body separator plate was not removed, proceed to Step 6. NOTE: Apply a light film of petroleum jelly to the valve body separator plate prior to assembling the new gaskets. Assemble the new gaskets to the valve body separator plate. 1. Main control to case gasket 2. Valve body separator plate 3. Main control to separator plate gasket (7 of 17) [4/20/2008 6:16:16 PM]

14 2. NOTE: Apply a small amount of petroleum jelly to each check ball prior to positioning them on the valve body separator plate. Install eight rubber and one steel EPC check balls. Item Part Number Description 1 EPC steel check ball (8 of 17) [4/20/2008 6:16:16 PM]

15 2 CB6 Check ball 3 BS1 Ball shuttle 4 CB9 Check ball 5 CB14 Check ball 6 CB1 Check ball 7 BS3 Ball shuttle 8 CB8 Check ball 9 CB7 Check ball 3. NOTE: Apply petroleum jelly to the EPC check ball spring prior to installing it into the case. Install the EPC check ball spring. 4. Position the valve body separator plate and the gaskets to the case carefully to retain the check balls. 5. NOTE: The word UP stamped on the separator plate reinforcement, must be visible when (9 of 17) [4/20/2008 6:16:16 PM]

16 installed. Install the separator plate reinforcement plate. 1. Position the separator plate reinforcement plate. 2. Install the bolts. 6. Install the solenoid screen assembly by pushing it in and rotating it to lock. (10 of 17) [4/20/2008 6:16:16 PM]

17 7. NOTE: Prior to installing the solenoid body assembly, coat the case connector bore with silicone grease. Install the solenoid body assembly. 1. Install the solenoid body assembly. 2. Install the nut. 3. Install the bolts and nut finger-tight. 8. Install the main control valve body. 1. Install the main control valve body. 2. Aligning the manual shift valve with the manual valve detent lever. 3. Install the nuts finger-tight. 4. Install the bolts finger-tight. (11 of 17) [4/20/2008 6:16:16 PM]

18 9. If previously installed, remove, then reinstall the bolt into the separator plate reinforcing plate. 1. Remove the bolt. 2. Install the bolt. (12 of 17) [4/20/2008 6:16:16 PM]

19 10. Install the accumulator body. 1. Install the accumulator body. 2. Install the nuts finger-tight. 3. Install the bolts finger-tight. (13 of 17) [4/20/2008 6:16:16 PM]

20 11. Tighten all the accumulator body, main control valve body, and solenoid body nuts and bolts. Tighten the bolts working from the center to the outside. (14 of 17) [4/20/2008 6:16:16 PM]

21 12. CAUTION: Do not reuse the old filter and seal assembly. CAUTION: Make sure that the pump bore is clean and the old filter seal has been removed. NOTE: Prior to installation, lightly lubricate the fluid filter seal with clean automatic transmission fluid. Install a new filter and seal assembly by pressing it into place. (15 of 17) [4/20/2008 6:16:16 PM]

13. NOTE: Do not discard the gasket unless damaged. This is a reusable gasket. NOTE: Apply a light coat of petroleum jelly to hold the gasket to the fluid pan.

22 13. NOTE: Do not discard the gasket unless damaged. This is a reusable gasket. NOTE: Apply a light coat of petroleum jelly to hold the gasket to the fluid pan. Position the gasket onto the clean fluid pan. Make sure the magnet is positioned over the dimple in the fluid pan. 14. CAUTION: Mixing the 4x2-style and 4x4-style transmission fluid filters and transmission pan assembly components can cause transmission damage. Install the correct pan with gasket for this application. Alternately tighten the bolts. (16 of 17) [4/20/2008 6:16:16 PM]

23 15. Connect the solenoid body electrical connector. 16. Lower the vehicle. (17 of 17) [4/20/2008 6:16:16 PM]

IN-VEHICLE REPAIR Procedure revision date: 12/15/ Position the vehicle on a hoist. For additional information, refer to Section

2002 F-150 Applies to: 4R100 Report a problem with this article SECTION 307-01A: Automatic Transmission 4R100 2002 F-150 Workshop Manual IN-VEHICLE REPAIR Procedure revision date: 12/15/2003 Main Control