Component & Wiring Harness Resistance Check
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Install Jumper Harness (J-39775) to transmission 20-pin connector. Using an ohmmeter, measure resistance between specified terminals for each component. See Fig 1. Compare resistance reading to known values. See TRANSMISSION COMPONENT RESISTANCE SPECIFICATIONS table.
- If resistance reading is okay, go to next step. If resistance reading is not okay, disconnect wiring harness at component and measure component resistance. Replace component if resistance is not as specified. If resistance is as specified, repair wiring harness between component and 20-pin connector.
- Measure resistance between ground and each terminal at transmission 20-pin connector. See Fig 1. Resistance should be less than 200 ohms for each component. Resistance for fluid temperature sensor will vary with temperature. If resistance is within specification, problem is intermittent. If resistance is low, disconnect wiring harness at component.
- Measure resistance between component terminals and ground. If resistance is low, replace component. If resistance is high, inspect wiring harness for short to ground. Repair as necessary.
TRANSMISSION COMPONENT RESISTANCE SPECIFICATIONS
| Component | Ohms | |
|---|---|---|
| Input & Output Shaft Speed Sensor | 1042-2088 | |
| Pressure Control Solenoid | 3-8 | |
| TCC PWM Solenoid | 10-15 | |
| TFT Sensor | ||
| At 68°F (20°C) | 3333-3689 | |
| At 212°F (100°C) | 167-189 | |
| 1-2 & 2-3 Shift Solenoids | 20-40 | |
NOTE:
Pressure switch assembly is also referred to as Transmission Fluid Pressure (TFP) Valve Position Switch.