GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Eighty Eight 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Transmission Fluid Pressure Manual Valve Position Switch Resistance Check

TFP Manual Valve Position Switch Resistance Check (1999 4T65-E)

Step

Action

Value(s)

Yes

No

1

Important: Complete testing of this component can only be performed while it is installed in an operable vehicle. However, a preliminary check of the pressure switches in their normal state can be performed while the transmission is out of the vehicle.

Is the transmission installed in the vehicle?

--

Go to Step 7

Go to Step 2

2
  1. Disconnect the automatic transmission (A/T) wiring harness assembly from the TFP manual valve position switch.
  2. Using the J 39200 digital multimeter (DMM), measure the resistance from terminal B to the TFP manual valve position switch housing.

Is the resistance less than the specified value?

50 ohms

Go to Step 3

Go to Step 23

3

Measure the resistance from terminal D to the TFP manual valve position switch housing.

Is the resistance less than the specified value?

50 ohms

Go to Step 4

Go to Step 23

4

Measure the resistance from terminal C to the TFP manual valve position switch housing.

Is the resistance less than the specified value?

50 ohms

Go to Step 5

Go to Step 23

5

Measure the resistance from terminal E to the TFP manual valve position switch housing.

Is the resistance less than the specified value?

50 ohms

Go to Step 6

Go to Step 23

6

Install the transmission into the vehicle.

Is the installation complete?

--

Go to Step 15

--

7
  1. Install the J 39775 jumper harness on the transmission side of the 20-way connector, if needed.
  2. Using the J 39200 digital multimeter (DMM) and the J 35616-A connector test adapter kit, measure the resistance from terminal U to the transmission case.

Is the resistance less than the specified value?

50 ohms

Go to Step 9

Go to Step 8

8
  1. Disconnect the A/T wiring harness assembly from the TFP manual valve position switch.
  2. Measure the resistance from terminal D to the TFP manual valve position switch housing.

Is the resistance less than the specified value?

50 ohms

Go to Step 21

Go to Step 23

9

Measure the resistance from terminal N to the transmission case.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 11

Go to Step 10

10
  1. Disconnect the A/T wiring harness assembly from the TFP manual valve position switch.
  2. Measure the resistance from terminal E to the TFP manual valve position switch housing.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 21

Go to Step 23

11

Measure the resistance from terminal R to the transmission case.

Is the resistance less than the specified value?

50 K ohms

Go to Step 13

Go to Step 12

12
  1. Disconnect the A/T wiring harness assembly from the TFP manual valve position switch.
  2. Measure the resistance from terminal B to the TFP manual valve position switch housing.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 21

Go to Step 23

13

Measure the resistance from terminal P to the transmission case.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 15

Go to Step 14

14
  1. Disconnect the A/T wiring harness assembly from the TFP manual valve position switch.
  2. Measure the resistance from terminal C to the TFP manual valve position switch housing.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 21

Go to Step 23

15
  1. Start the engine and let the engine idle.
  2. Apply the brakes.
  3. Place the gear selector in PARK.
  4. Measure the resistance from terminal U to the transmission case.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 16

Go to Step 21

16
  1. Place the gear selector in REVERSE.
  2. Measure the resistance from terminal N to the transmission case.

Is the resistance less than the specified value?

50 ohms

Go to Step 17

Go to Step 21

17
  1. Place the gear selector in D4.
  2. Measure the resistance from terminal P to the transmission case.

Is the resistance less than the specified value?

50 ohms

Go to Step 18

Go to Step 21

18
  1. Place the gear selector in D3.
  2. Measure the resistance from terminal R to the transmission case.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 19

Go to Step 21

19
  1. Place the gear selector in D2.
  2. Measure the resistance from terminal R to the transmission case.

Is the resistance greater than the specified value?

50 K ohms

Go to Step 20

Go to Step 23

20
  1. Place the gear selector in D1.
  2. Measure the resistance from terminal N to the transmission case.

Is the resistance less than the specified value?

50 ohms

System OK

Go to Step 23

21
  1. Disconnect the A/T wiring harness assembly from the TFP manual valve position switch.
  2. Inspect the following circuits of the A/T wiring harness assembly for an open or short:
    3. • 1224 (PNK)
    • 1225 (DK BLU)
    • 1226 (ORN)
    • 1804 (WHT)

Was a condition found?

--

Go to Step 22

Go to Step 23

22

Replace the Automatic Transmission Wiring Harness Assembly.

Is the replacement complete?

--

Go to Step 1

--

23

Replace the Automatic Transmission Fluid Pressure Manual Valve Position Switch.

Is the replacement complete?

--

Go to Step 1

--