Hummer H1 Service Manual page 326

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Step
1 1. Install the J 39775 Jumper harness on the
transmission side of the 20 way transmission
pass-through connector.
2. Using a DVOM and the J35616 Connector
Test Adapter Kit, measure the resistance from
terminal N to the transmission case.
Is the resistance greater than the value indicated?
2 1. Disconnect the Automatic Transmission Wir-
ing Harness Assembly form the TFP Val.
Position Sw.
2. Measure the resistance from terminal A of
the TFP Val. Position Sw. to the switch hous-
ing.
Is the resistance greater than the value indicated?
3 Measure the resistance from terminal R to the
transmission case.
Is the resistance greater than the indicated value?
4 1. Disconnect the Automatic Transmission Wir-
ing Harness Assembly from the TFP Val.
Position Sw.
2. Measure the resistance from terminal B of
the TFP Val. Position Sw. to the switch hous-
ing.
Is the resistance greater than the value indicated?
5 Measure the resistance from terminal P to the
transmission case.
Is the resistance greater than the value indicated?
6 1. Disconnect the Automatic Transmission Wir-
ing Harness Assembly from the TFP Val.
Position Sw.
2. Measure the resistance from terminal C of
the TFP Val. Position Sw. to the switch hous-
ing.
Is the resistance greater than the value indicated?
7 1. Start the engine, and let the engine idle.
2. Set the parking brake.
3. Place the gear selector in Drive (D4).
4. Measure the resistance from terminal R to the
transmission case.
Is the resistance less than the indicated value?
8 1. Place the gear selector in Drive (D4).
2. Measure the resistance from terminal P to the
transmission case.
Is the resistance less than the value indicated?
05745159
TFP Valve Position Switch Resistance Check
Action
Transmission/Transfer Case
Value(s)
50 k Ω
Go to step 3
50 k Ω
go to step 15
50 k Ω
go to step 5
50 k Ω
Go to step 15
50 k Ω
Go to step 7
50 k Ω
Go to step 15
200 Ω
Go to step 8
200 Ω
Go to step 9
5-127
Yes No
Go to step 2
go to step 16
Go to step 4
Go to step 16
Go to step 6
Go to step 16
Go to step 14
Go to step 14