Hummer H1 Service Manual page 327

5-128 Transmission/Transfer Case
Step
9 1. Place the gear selector in Low (D1).
2. Measure the resistance from terminal N to
the transmission case.
Is the resistance less than the value indicated?
10 1. Place the gear selector in Low (D1).
2. Measure the resistance from terminal P to the
transmission case.
Is the resistance less than the value indicated?
11 1. Place the gear selector in Reverse (R).
2. Measure the resistance from terminal N to
the transmission case.
Is resistance less than the value indicated?
12 1. Place the transmission in Reverse (R).
2. Measure the resistance from terminal P to the
transmission case.
Is the resistance greater than the value indicated?
13 1. Place the gear selector in Manual Third (D3).
2. Measure resistance from terminal R to the
transmission case.
Is the resistance greater than the value indicated?
14 1. Disconnect the Automatic Transmission Wir-
ing Harness from the TFP Val. Position Sw.
2. Inspect the three circuits going to the TFP
Val. Position Sw. for an open circuit.
Did you find a problem?
15 Replace the Automatic Transmission Wiring Har-
ness Assembly.
Is the replacement complete?
16 1. Replace the TFP Val. Position Sw.
2. Inspect the Automatic Transmission Wiring
Harness Assembly.
Is the replacement of the TFP Val. Position Sw.
complete?
TFP Valve Position Switch Resistance Check (Cont'd)
Action
___________________________________________
Value(s)
200 Ω
200 Ω
200Ω
50 kΩ
50 kΩ
Yes No
Go to step 10 Go to step 14
Go to step 11 Go to step 16
Go to step 12 Go to step 16
Go to step 13 Go to step 16
No problem Go to step 16
found. Exit
table.
Go to step 15 Go to step 16
verify repair, go
to step 1
verify repair, go
to step 1
®