4L80-E Automatic Transmission Fluid Pressure Manual Valve Position
Switch (TFP Val. Position Sw.) Resistance Check
Step
| Action
| Value(s)
| Yes
| No
|
1
|
- Install the J 39775 Jumper Harness on the transmission
side of the 20-way connector.
- Using the J 39200 DVOM and the J 35616 Connector
Test Adapter Kit, measure the resistance from terminal N to the transmission
case.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go to Step 3
|
Go to Step 2
|
2
|
- Disconnect the Automatic Transmission Wiring Harness Assembly
from the TFP Val. Position Sw.
- Measure the resitance from terminal A of the TFP Val. Position
Sw. to the switch housing.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go
to Step 15
|
Go to Step 16
|
3
| Measure
the resistance from terminal R to the transmission case.
Is the resistance greater than the indicated value?
| 50 kohms
|
Go
to Step 5
|
Go to Step 4
|
4
|
- Disconnect the Automatic Transmission Wiring Harness Assembly
from the TFP Val. Position Sw.
- Measure the resistance from terminal B of the TFP Val. Position
Sw. to the switch housing.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go
to Step 15
|
Go to Step 16
|
5
| Measure
the resistance from terminal P to the transmission case.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go
to Step 7
|
Go to Step 6
|
6
|
- Disconnect the Automatic Transmission Wiring Harness Assembly
from the TFP Val. Position Sw.
- Measure the resistance from terminal C of the TFP Val. Position
Sw. to the switch housing.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go
to Step 15
|
Go to Step 16
|
7
|
- Start the engine, and let the engine idle.
- Set the parking brake.
- Place the gear selector in Drive (D4).
- Measure the resistance from terminal R to the transmission case.
Is the resistance less than the indicated value?
| 200ohms
|
Go to Step 8
|
Go to Step 14
|
8
|
- Place the gear selector in Drive (D4).
- Measure the resistance from terminal P to the transmission case.
Is the resistance less than the value indicated?
| 200ohms
|
Go to Step 9
|
Go to Step 14
|
9
|
- Place the selector in Low (D1).
- Measure the resistance from terminal N to the transmission case.
Is the resistance less than the value indicated?
| 200ohms
|
Go to Step 10
|
Go to Step 14
|
10
|
- Place the gear selector in Low (D1).
- Measure the resistance from terminal P to the transmission case.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go to Step 11
|
Go to Step 16
|
11
|
- Place the gear selector in Reverse (R).
- Measure the resistance from terminal N to the transmission case.
Is the resistance less than the value indicated?
| 200ohms
|
Go to Step 12
|
Go to Step 16
|
12
|
- Place the transmission in Reverse (R).
- Measure the resistance from terminal P to the transmission case.
Is the resistance greater than the value indicated?
| 50 kohms
|
Go to step 13
|
Go to Step 16
|
13
|
- Place the gear selector in Manual Third (D3).
- Measure the resistance from terminal R to the transmission case.
Is the resistance greater than the value indicated?
| 50 kohms
| No problem found. Exit table.
|
Go
to Step 16
|
14
|
- Disconnect the Automatic Transmission Wiring Harness from the
TFP Val. Position Sw.
- Inspect circuits 1225, 1226, and 1227 of the Automatic Transmission
Wiring Harness Assembly for an open circuit.
Did you find a problem?
| --
|
Go to Step 15
|
Go
to Step 16
|
15
| Replace the Automatic Transmission
Wiring Harness Assembly. Refer to 4L80-E Automatic Transmission On-Vehicle
Service.
Is the replacement complete?
| --
|
Verify repair and go to Step 1
| --
|
16
|
- Replace the TFP Val. Position Sw.
- Refer to 4L80-E Automatic Transmission On-Vehicle Service.
- Inspect the Automatic Transmission Wiring Harness Assembly.
Is the replacement of the TFP Val. Position Sw. complete?
| --
|
Verify repair and go
to Step 1
| --
|
