Table of Contents
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K
ON-BOARD DIAGNOSIS SYSTEM
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Diagnostic trouble code
Transmission Fluid Temperature
(TFT)
sensor malfunction-4R44E Only
NO. PO71 2, PO71 3, P I 711, P I 783
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Symptom
Excessive shift shock, TFT out of range
PO713 is set if temperature exceeds set scale - 40°F
PO71 2 is set if temperature exceeds set scale 31
5°F
PI711 is set if signal went high or low during self-test
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PI783 is set if temperature exceeds 270°F
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S T E P
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INSPECTION
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ACTION
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1
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Make sure transm~ss~on harness connector
IS
fully seated and
Yes
Go to step 2
terrnlnals are fully engaged In connector and In good condrtion
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before proceeding.
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No
Perform checks Erase codes and repeat self-tests
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Have Items been checked?
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Caution
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Do not pry up on connector. Depress release button then
pull up on connector.
Key OFF
Drsconnect 16-prn transmlss~on vehlcle harness connector
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Us~ng a mlrror, Inspect both ends of connector for damaged or
pushed out plns,
corrosion,
loose wlres and mlsslng or damaged
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seals
Yes
Go to step 5
Refer to connector information and solenoid application
chart following this test
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Uslng voltmeter, connect posltlve lead to TFT crrcu~t and negat~ve
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lead to SIG RTN clrcult of transm~ss~on vehrcle harness connector
Set voltmeter to 20-volt scale
Key ON, englne OFF
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Is voltage between 4 75 and 5 25 volts?
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Key OFF
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Ensure transmlss~on vehlcle harness connector
IS
disconnected
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D~sconnect PCM and Install 104 pln breakout box (BOB)
Measure res~stance between test pin 37 at BOB and appropr~ate
slgnal p ~ n at transmrsslon connector
Measure res~stance between test plns 91 at BOB and approprrate
s~gnal prns at transmlss~on connector
Are both resrstances less than 5 ohms?
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4
(Key OFF
Ensure transrnlss~on veh~cle harness connector
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drsconnected
Drsconnect PCM and Install 104-p~n breakout box (BOB)
Measure res~stance between test pln 37 and test plns 71197 at
BOB
Measure res~stance between test pins 37 and chass~s ground, test
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plns 51.76,77, 103, and 91
Are res~stances greater than 10,000 ohms?
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5
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Note
Be sure trans tester solenoid select switch is in the OHMS
CHECK position or damage to ohmmeter may result.
transmlss~on tester 49 UNOl 071 and 4R44E cable overlay
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49 UN01 132.
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Set MODE switch to BENCH
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Rotate solenold select swltch to OHMS CHECK
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Connect posltrve lead of ohmmeter to +TFT jack and negatrve
) lead to - TFT jack
Note
While performing the following tests, observe resistances.
DTC PO713 (open circuit) is set if resistance is above
869K
ohms. DTC PO712 (short circuit) is set if resistance is
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below 597K ohms.
Perform the following tests
Test 1 Record reslstance Refer to the TFT sensor res~stance
chart followtng t h ~ s test
Test 2 Check for rnterrn~ttent short or open If resrstance was
between 0 8K and
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O O K ohms, perform the follow~ng test
If transmlsslon
IS
cold, run transm~ssron to warm ~t If transmls-
sron
IS
warm, allow transmlsslon to cool
Check TFT sensor reslstance again
Compare resrstance w ~ t h l n ~ t ~ a l
resrstance Resistance should
decrease
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transmlss~on was allowed to cool
If correct change In res~stance occurs, repeat self-tests
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; s res~stance w~thln range?
Yes
Yes
Yes
Go to step 3
Servlce open clrcu~ts Go to step 8
Go to step 5.
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Service short clrcu~t Go to step 8
Go to step 6
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Replace Internal transm~sslon wlrrng harness
Go to step 8
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Table of Contents
Troubleshooting
