GM Service Manual Online
For 1990-2009 cars only

Component Resistance Chart

Component

Wire Color

Pass-Thru Pin

Resistance @ 20°C (68°F)

Circuit #

1-2 Shift Solenoid Valve (1-2 SS Valve)

Red

E*

20-40ohms

839A

LT Green

A

1222

2-3 Shift Solenoid Valve (2-3 SS Valve)

Red

E*

20-40ohms

839B

Yellow

B

1223

Pressure Control Solenoid Valve (PC Sol. Valve)

Purple

C

3.5-8ohms

1228

LT Blue

D

1229

TCC Solenoid Valve (TCC Sol. Valve)

Red

E*

10-15ohms

839C

Black

S

418

Automatic Transmission Fluid Temprerature (TFT) Sensor

Brown

L

3333-3689ohms

1227

Gray

M

452

Automatic Transmission Input Shaft Speed (A/T ISS) Sensor

Red/Black

**

1042-2088ohms

1230

Blue/White

**

1231

Automatic Transmission Output Shaft Speed Sensor (A/T OSS)

Purple/White

***

1042-2088ohms

821

LT Green/Black

***

822

  • * Spliced Internally to Pin E
  • ** A/T ISS Sensor Harness
  • *** A/T OSS Sensor Harness