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Automatic Transaxle Diagnosis - 4T40-E (3.1L): Maintenance Oldsmobile Cutlass VI

Automatic Trans 2 illustrations ~670 words

TRANSAXLE FLUID PRESSURE (TFP) MANUAL VALVE POSITION SWITCH

RESISTANCE CHECK

Note. For TFP manual valve position switch terminal identification, see WIRING DIAGRAMS .

  1. Install Jumper Harness (J-39775) on transaxle 20-pin connector (transaxle harness side). Using a DVOM and Connector Test Adapter Kit (J-35616), measure resistance between transaxle 20-pin connector terminals "U" and transaxle case. see scheme 1 If resistance is less than 50 ohms, go to step 3). If resistance is more than 50 ohms, go to next step.
  2. Disconnect wiring harness connector at position switch. see scheme 1 Measure resistance between position switch terminal "D" and position switch housing. If resistance is less than 50 ohms, go to step 14). If resistance is more than 50 ohms, replace position switch.
  3. Reconnect position switch connector. Measure resistance between transaxle 20-pin connector terminal "N" and transaxle case. see scheme 1 If resistance is more than 50 k/ohms, go to step 5). If resistance is less than 50 k/ohms, go to next step.
  4. Disconnect wiring harness connector at position switch. see scheme 1 Measure resistance between position switch terminal "A" and position switch housing. If resistance is more than 50 k/ohms, go to step 14). If resistance is less than 50 k/ohms, replace position switch.
  5. Reconnect position switch connector. Measure resistance between transaxle 20-pin connector terminal "R" and transaxle case. see scheme 1 If resistance is more than 50 k/ohms, go to step 7). If resistance is less than 50 k/ohms, go to next step.
  6. Disconnect wiring harness connector at position switch. see scheme 1 Measure resistance between position switch terminal "B" and position switch housing. If resistance is more than 50 k/ohms, go to step 14). If resistance is less than 50 k/ohms, replace position switch.
  7. Reconnect position switch connector. Measure resistance between transaxle 20-pin connector terminal "P" and transaxle case. see scheme 1 If resistance is more than 50 k/ohms, go to step 9). If resistance is less than 50 k/ohms, go to next step.
  8. Disconnect wiring harness connector at position switch. see scheme 1 Measure resistance between position switch terminal "C" and position switch housing. see scheme 1 If resistance is more than 50 k/ohms, go to step 14). If resistance is less than 50 k/ohms, replace position switch.
  9. Reconnect position switch connector. Start engine and let idle. Set parking brake. Ensure gear selector is in "P" position. Measure resistance between transaxle 20-pin connector terminal "U" and transaxle case. If resistance is more than 50 k/ohms, go to next step. If resistance is less than 50 k/ohms, replace position switch.
  10. Place gear selector in "R" position. Measure resistance between transaxle 20-pin connector terminal "P" and transaxle case. If resistance is less than 50 ohms, go to next step. If resistance is more than 50 ohms, replace position switch.
  11. Place gear selector in "D" position. Measure resistance between transaxle 20-pin connector terminal "N" and transaxle case. If resistance is less than 50 ohms, measure resistance between transaxle 20-pin connector terminal "R" and transaxle case. If resistance is less than 50 ohms, go to next step. If resistance is more than 50 ohms, replace position switch.
  12. Place gear selector in "1" position. Measure resistance between transaxle 20-pin connector terminal "N" and transaxle case. If resistance is less than 50 ohms, go to next step. If resistance is more than 50 ohms, replace position switch.
  13. Reconnect position switch connector. Measure resistance between transaxle 20-pin connector terminal "P" and transaxle case. see scheme 1 If resistance is less than 50 ohms, go to next step. If resistance is more than 50 ohms, replace position switch.
  14. Inspect for high resistance. Check transaxle wiring harness for poor electrical connections at 20-pin connector and at position switch. Look for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Repair as necessary, then go to step 1). If no problem was found, replace transaxle wiring harness.
Selector Lever PositionSolenoid PositionElements In Use
"D" (Drive) First Gear"A" ON/"B" OFFForward Clutch, (1) Input Sprag & (1) Low Roller Clutch
"D" (Drive) Second Gear"A" OFF/"B" OFFForward Clutch, (1) Input Sprag, (3) Low Roller Clutch 2nd Clutch & (1) 2nd Roller Clutch
"D" (Drive) Third Gear"A" OFF/"B" ONDirect Clutch, Forward Clutch, (1) Input Sprag, (3) Low Roller Clutch, (2) 2nd Clutch & (3) 2nd Roller Clutch
"D" (Drive) Overdrive"A" ON/"B" ONDirect Clutch, (2) Forward Clutch, (3) Input Sprag, Intermediate/4th Band, Low Roller Clutch & (2) 2nd Clutch
"3" (Manual Third) First Gear"A" ON/"B" OFFCoast Clutch, Forward Clutch, (1) Input Sprag & (1) Low Roller Clutch
"3" (Manual Third) Second Gear"A" OFF/"B" OFFCoast Clutch, Forward Clutch, (1) Input Sprag, (3) Low Roller Clutch, 2nd Clutch & (1) 2nd Roller Clutch
"3" (Manual Third) Third Gear"A" OFF/"B" ONCoast Clutch, Direct Clutch, Forward Clutch, (1) Input Sprag, (3) Low Roller Clutch, (2) 2nd Clutch & (3) 2nd Roller Clutch
"2" (Manual Second) First Gear"A" ON/"B" OFFCoast Clutch, Forward Clutch, (1) Input Sprag & (1) Low Roller Clutch
"2" (Manual Second) Second Gear"A" OFF/"B" OFFCoast Clutch, Forward Clutch, (1) Input Sprag, Intermediate/4th Band, (3) Low Roller Clutch, 2nd Clutch & (1) 2nd Roller Clutch
"2" (Manual Second) Third Gear (4)"A" OFF/"B" ONCoast Clutch, Direct Clutch, Forward Clutch, (1) Input Sprag, (3) Low Roller Clutch, (2) 2nd Clutch & (3) 2nd Roller Clutch
"1" (Manual Low) First Gear"A" ON/"B" OFFCoast Clutch, Forward Clutch, (1) Input Sprag, Low & Reverse Band & (1) Low Roller Clutch
"1" (Manual Low) Second Gear (5)"A" OFF/"B" OFFCoast Clutch, Forward Clutch, (1) Input Sprag, Intermediate/4th Band (3) Low Roller Clutch, 2nd Clutch & (1) 2nd Roller Clutch
"R" (Reverse)"A" ON/"B" OFFLow & Reverse Band & Reverse Clutch
"N" or "P" (Neutral or Park)"A" ON/"B" OFFLow & Reverse Band
(1) Holding. (2) Applied but not effective. (3) Overrunning. (4) Third gear isonly available above about 62 MPH. (5) Second gear isonly available above about 37 MPH.
(1)Holding.
(2)Applied but not effective.
(3)Overrunning.
(4)Third gear isonly available above about 62 MPH.
(5)Second gear isonly available above about 37 MPH.

CLUTCH & BAND APPLICATION CHART

Scheme 14

Scheme 14: PCM CONNECTOR IDENTIFICATION
Scheme 14: PCM CONNECTOR IDENTIFICATION

Scheme 15

Scheme 15
Scheme 15

Transmission Wiring Diagram (1997). Scheme 16

Transmission Wiring Diagram (1998). Scheme 17

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