Transmission Fluid Pressure Manual Valve Position Switch Resistance Check. Buick Century 1997

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1997 🢒 Century 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Transmission Fluid Pressure Manual Valve Position Switch Resistance Check

4T65-E TFP Val. Position Sw. Resistance Check (created for '97 Hcar)

Step

Action

Value(s)

Yes

Install J 39775 Jumper Harness on the transmission 20-way connector, if needed.
Using J 39200 DVOM and J 35616-A Connector Test Adapter Kit, measure the resistance between terminals U and N.

Is the resistance more than the value shown?

50kohms

Go to Step 3

Go to Step 2

Disconnect the Automatic Transmission (A/T) Wiring Harness from the TFP Val. Position Sw.
Measure the resistance between terminals B and E of the TFP Val. Position Sw.

Is the resistance more than the value shown?

50kohms

Go to Step 19

Go to Step 21

Measure the resistance between terminals U and R of the transmission 20-way connector.

Is the resistance less than the value shown?

50ohms

Go to Step 5

Go to Step 4

Disconnect the Automatic Transmission (A/T) Wiring Harness from the TFP Val. Position Sw.
Measure the resistance between terminals B and D of the TFP Val. Position Sw.

Is the resistance less than the value shown?

50ohms

Go to Step 19

Go to Step 21

Measure the resistance between terminals U and P of the transmission 20-way connector.

Is the resistance more than the value shown?

50kohms

Go to Step 7

Go to Step 6

Disconnect the Automatic Transmission (A/T) Wiring Harness from the TFP Val. Position Sw.
Measure the resistance between terminals B and C of the TFP Val. Position Sw.

Is the resistance more than the value shown?

50kohms

Go to Step 19

Go to Step 21

Measure the resistance between terminals P and R of the transmission 20-way connector.

Is the resistance more than the value shown?

50kohms

Go to Step 9

Go to Step 8

Disconnect the Automatic Transmission (A/T) Wiring Harness from the TFP Val. Position Sw.
Measure the resistance between terminals C and D of the TFP Val. Position Sw.

Is the resistance more than the value shown?

50kohms

Go to Step 19

Go to Step 21

Measure the resistance between terminals N and P of the transmission 20-way connector.

Is the resistance more than the value shown?

50kohms

Go to Step 11

Go to Step 10

Disconnect the Automatic Transmission (A/T) Wiring Harness from the TFP Val. Position Sw.
Measure the resistance between terminals C and E of the TFP Val. Position Sw.

Is the resistance more than the value shown?

50kohms

Go to Step 19

Go to Step 21

Measure the resistance between terminals N and R of the transmission 20-way connector.

Is the resistance more than the value shown?

50kohms

Go to Step 13

Go to Step 12

Disconnect the Automatic Transmission (A/T) Wiring Harness from the TFP Val. Position Sw.
Measure the resistance between terminals D and E of the TFP Val. Position Sw.

Is the resistance more than the value shown?

50kohms

Go to Step 19

Go to Step 21

Measure the resistance between terminal B and the TFP Val. Position Sw. housing.

Is the resistance less than the value shown?

50ohms

Go to Step 14

Go to Step 21

Measure the resistance between terminal C and the TFP Val. Position Sw. housing.

Is the resistance more than the value shown?

50kohms

Go to Step 15

Go to Step 21

Measure the resistance between terminal D and the TFP Val. Position Sw. housing.

Is the resistance less than the value shown?

50ohms

Go to Step 16

Go to Step 21

Measure the resistance between terminal E and the TFP Val. Position Sw. housing.

Is the resistance more than the value shown?

50kohms

Go to Step 17

Go to Step 21

Measure the resistance of the Automatic Transmission (A/T) Wiring Harness from pins N and P of the transmission 20-way connector to the transmission case.

Is the resistance more than the value shown?

50kohms

Go to Step 18

Go to Step 20

Measure the resistance of the Automatic Transmission (A/T) Wiring Harness from pins R and U of the transmission 20-way connector to the transmission case.

Is the resistance less than the value shown?

50ohms

No problem found, exit table

Go to Step 20

Inspect for high resistance:

•	Inspect the transmission wiring for poor electrical connections at the transmission 20-way connector and at the TFP Val. Position Sw. connector.

•	Look for possible bent, backed out, deformed, or damaged terminals.

•	Check for weak terminal tension.

Was the condition found and corrected?

Verify repair, Go to Step 1

Go to Step 20

Replace the Automatic Transmission (A/T) Wiring Harness.

Is the replacement complete?

Verify repair, Go to Step 1

Replace the TFP Val. Position Sw.

Is the replacement complete?

Verify repair, Go to Step 1