Hummer H1 (2002+). Manual - part 82

 

___________________________________________

 

 Transmission/Transfer Case  5-127

 

 

®

 

05745159

 

 TFP Valve Position Switch Resistance Check 

 

Step

Action

Value(s)

Yes

No

 

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?

50 k

 

Ω

 

Go to step 3

Go to step 2

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?

50 k

 

Ω

 

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 k

 

Ω

 

go to step 5

Go to step 4

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?

50 k

 

Ω

 

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 k

 

Ω

 

Go to step 7

Go to step 6

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?

50 k

 

Ω

 

Go to step 15

Go to step 16

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?

200

 

Ω

 

Go to step 8

Go to step 14

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?

200

 

Ω

 

Go to step 9

Go to step 14

 

5-128

Transmission/Transfer Case

 

___________________________________________

 

 

®

 

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?

200

 

Ω

 

Go to step 10

Go to step 14

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?

200

 

Ω

Go to step 11

Go to step 16

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?

200

Ω

Go to step 12

Go to step 16

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?

50 k

Ω

Go to step 13

Go to step 16

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?

50 k

Ω

No problem 

found. Exit 

table.

Go to step 16

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?

Go to step 15

Go to step 16

15

Replace the Automatic Transmission Wiring Har-
ness Assembly. 
Is the replacement complete?

verify repair, go 

to step 1

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?

verify repair, go 

to step 1

 TFP Valve Position Switch Resistance Check (Cont’d)

Step

Action

Value(s)

Yes

No

___________________________________________

 Transmission/Transfer Case  5-129

®

05745159

 Automatic Transmission Wiring Harness Check 

Step

Action

Value(s)

Yes

No

1

1.

Install the J 39775 jumper on the transmis-
sion 20 way connector.

2.

Using a DVOM and a J 35616 Test Adapter 
Kit, measure the resistance between termi-
nals A and E (1-2 Shift Solenoid)

Is the resistance within the values indicated?

19-24

Ω

 @ 20° 

C (68°F)

24-31

Ω

 @ 

100°C (212°F)

Go to step 3

Go to step 2

2

1.

Disconnect the 1-2 Shift Solenoid Valve from 
the Automatic Transmission Wiring Harness 
Assembly

2.

Using the DVOM, measure the resistance of 
the 1-2 SS Valve.

Is the resistance within the values indicated?

19-24

Ω

 @ 20° 

C (68°F)

24-31

Ω

 @ 

100°C (212°F)

go to step 12

Go to step 14

3

Measure the resistance between terminals B and 
E (2-3 Shift Solenoid Valve)
Is the resistance within the values indicated?

19-24

Ω

 @ 20° 

C (68°F)

24-31

Ω

 @ 

100°C (212°F)

Go to step 5

Go to step 4

4

1.

Disconnect the 2-3 SS Valve from the Auto-
matic Transmission Wiring Harness Assem-
bly.

2.

Using the DVOM, measure resistance of the 
2-3 SS Valve.

Is the resistance within the values indicated?

19-24

Ω

 @ 20° 

C (68°F)

24-31

Ω

 @ 

100°C (212°F)

Go to step 12

Go to step 14

5

Measure the resistance between terminals S and E 
(Torque Converter Clutch Pulse Width Modula-
tion Solenoid Valve).
Is the resistance within the values indicated?

10-11

Ω

 @ 20° 

C (68°F)

13-15

Ω

 @ 

100°C (212°F)

Go to step 7

Go to step 6

6

1.

Disconnect the Torque Converter Clutch 
Pulse Width Modulation Solenoid Valve from 
the Automatic Transmission Wiring Harness 
Assembly.

2.

Using the DVOM, measure the resistance of 
the TCC PWM Sol. Valve.

Is the resistance within the values indicated?

10-11

Ω

 @ 20° 

C (68°F)

13-15

Ω

 @ 

100°C (212°F)

Go to step 12

Go to step 14

7

Measure the resistance between terminals C and 
D (Pressure Control Solenoid Valve).
Is the resistance within the values indicated?

3-5

Ω

 @ 20° C 

(68°F)

4-7

Ω

 @ 100°C 

(212°F)

Go to step 9

Go to step 8

8

1.

Disconnect the Pressure Control Solenoid 
Valve from the A/T Wiring Harness Assy.

2.

Using the DVOM, measure the resistance of 
the PC Sol. Valve.

Is the resistance within the values indicated?

3-5

Ω

 @ 20° C 

(68°F)

4-7

Ω

 @ 100°C 

(212°F)

Go to step 12

Go to step 14

5-130

Transmission/Transfer Case

___________________________________________

®

9

Measure the resistance between terminals L and 
M (Transmission Fluid Temperature Sensor)
Is the resistance within the values indicated?

3333-3689

Ω

 @ 

20° C (68°F)

24-31

Ω

 @ 

100°C (212°F)

Go to step 10

Go to step 12

10

Measure the resistance from terminals 
A,B,C,D,E,L,M,N,P,R and S of the A/T Wiring 
Harness Assy. at the transmission 20 way connec-
tor to the transmission case.
Is the resistance measured greater than the value 
indicated?

250 k

Ω

No problem 

found. Exit 

table

Go to step 11

11

1.

Disconnect the A/T Wiring Harness Assy. 
from all the components.

2.

Measure the resistance from all the compo-
nents terminals to the transmission case.

Is the resistance measured greater than the value 
indicated?

250 k

Ω

Go to Step 12

Go to Step 14

12

Inspect for high resistance or a shorted condition:

• Inspect the A/T Wiring Harness Assy. for 

poor electrical connections at the transmis-
sion 20-way connector and at the compo-
nent connectors.

• Look for possible bent, backed out, de-

formed, or damaged terminals.

• Inspect for weak terminal tension

• Inspect for chafed wire that could short to 

bare metal or other wiring.

• If diagnosing for a possible intermittent 

condition, move or massage the A/T Wir-
ing Harness Assy. while observing test 
equipment for a change.

Was high resistance or a shorted condition found?

Verify the repair 
and go to Step 1

Go to step 13

13

Replace the A/T Wiring Harness Assy.
Is the replacement complete?

Verify the repair 

and go to step 1

14

Replace the faulty component.
Is the replacement complete?

Verify the repair 

and go to step 1

 Automatic Transmission Wiring Harness Check (Cont’d)

Step

Action

Value(s)

Yes

No