GM Service Manual Online
For 1990-2009 cars only

Component Resistance

Component

Wire Color

Pass-Thru Pin

Resistance at 20°C (68°F)

Circuit Number

1-2 Shift Solenoid (SS) Valve

Red

*E

20-40 ohms

839A

LT Green

A

1222

2-3 Shift Solenoid (SS) Valve

Red

*E

20-40 ohms

839B

Yellow

B

1223

Pressure Control (PC) Solenoid Valve

Purple

C

3.5-8 ohms

1228

LT Blue

D

1229

Torque Converter Clutch (TCC) Solenoid Valve

Red

*E

10-15 ohms

839C

Black

S

418

Automatic Transmission Fluid Temperature (TFT) Sensor

Brown

L

3333-3689 ohms

1227

Gray

M

452

Automatic Transmission Input Shaft Speed (AT ISS) Sensor

Red/Black

**

1042-2088 ohms

1230

Blue/White

**

1231

Automatic Transmission Output Shaft Speed (AT OSS) Sensor

Purple/White

***

1042-2088 ohms

821

LT Green/Black

***

822

* Spliced Internally to Pin E (circuit #839)

** AT ISS Sensor Harness

***AT OSS Sensor Harness