Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSOLDSMOBILE197098 ENG CD TS, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAUTOMATIC TEMPERATURE CONTROLTESTINGTESTING SENSOR CIRCUIT FOR AN OPEN
1970 Oldsmobile 98 Eng CD TS, Automatic Trans
Testing Sensor Circuit For An Open
1970 Oldsmobile 98 Eng CD TS, Automatic TransSECTION Testing Sensor Circuit For An Open
- Use Tester voltmeter probe, position voltage knob in the probe position, attach Tester ground clip to car and disconnect power plug from amplifier.
- Place ignition switch in the accessory position, then test for battery voltage at both terminals on all three connectors. Obtaining a voltage reading at both terminals indicates a good sensor or potentiometer. Obtaining a voltage reading at one terminal only indicates an open circuit in the sensor or potentiometer. Replace sensor or potentiometer.
- No voltage at either terminal on a sensor or potentiometer indicates the open circuit is at one of the other sensors or the battery feed wire to the sensor circuit is open.
| Temp. | Outside Sensor Ohms | Sensor on Control Ohms |
|---|---|---|
| 60° | 44 | 95 |
| 65° | 41 | 86 |
| 70° | 38 | 76 |
| 75° | 36 | 68 |
| 80° | 34 | 60 |
| 85° | 32 | 55 |
| 90° | 30 | 50 |
| 95° | 27 | 45 |
| 100° | 23 | 40 |
| Sensor Resistance (except node) (Plus or minus 5%) | ||
| Temp. | Duct Sensor Ohms | Ambient Sensor Ohms | In-Car Sensor Ohms |
|---|---|---|---|
| 60° | 58 | 40 | 95 |
| 65° | 56 | 37 | 86 |
| 70° | 53 | 35 | 76 |
| 75° | 50 | 34 | 68 |
| 80° | 47 1/2 | 32 | 60 |
| 85° | 45 | 30 | 55 |
| 90° | 42 1/2 | 28 | 50 |
| 95° | 39 | 27 | 45 |
| 100° | 37 1/2 | 25 | 40 |
| Sensor Resistance (Toronado) (Plus or minus 5%) | |||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.