GM Service Manual Online
For 1990-2009 cars only

Component Resistance Chart

Component

Wire Color

Pass-Thru Pin

Resistance at 20°C (68°F)

Circuit Number

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

Red

* E

20-40 ohms

839A

LT Green

A

1222

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

Red

* E

20-40 ohms

839B

Yellow

B

1223

Pressure Control Solenoid Valve (PC Sol. Valve)

Purple

C

3.5-8 ohms

1228

LT Blue

D

1229

TCC Solenoid Valve (TCC Sol. 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 (A/T ISS) Sensor

Red/Black

**

1042-2088 ohms

1230

Blue/White

**

1231

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

Purple/White

***

1042-2088 ohms

821

LT Green/Black

***

822

* Spliced Internally to Pin E (circuit #839)

** A/T ISS Sensor Harness

***A/T OSS Sensor Harness