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 MANUALSGMC1991JIMMY 5.7 K, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESENSOR RANGE CHARTSENGINE CONTROLS - SENSOR OPERATING RANGE CHARTSINTRODUCTION
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8
Engine Controls - Sensor Operating Range Charts: Introduction
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8SECTION Introduction
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it will cause driveability problems.
NOTE:
Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in testing procedures.
COOLANT TEMPERATURE RESISTANCE VALUES (1)
| °F (°C) | Ohms | ||
|---|---|---|---|
| 210 (99) | 185 | ||
| 160 (70) | 450 | ||
| 100 (38) | 1800 | ||
| 70 (20) | 3400 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,000 | ||
| -40 (-40) | 100,700 | ||
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MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE VALUES (1)
| °F (°C) | Ohms | ||
|---|---|---|---|
| 210 (99) | 185 | ||
| 160 (70) | 450 | ||
| 100 (38) | 1800 | ||
| 70 (20) | 3400 | ||
| 40 (4) | 7500 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,000 | ||
| -40 (-40) | 100,700 | ||
|
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MAP SENSOR VOLTAGE RANGE (1)
| Altitude (Ft.) | Volts | ||
|---|---|---|---|
| Below 1000 | 3.8-5.5 | ||
| 1000-2000 | 3.6-5.3 | ||
| 2000-3000 | 3.5-5.1 | ||
| 3000-4000 | 3.3-5.0 | ||
| 4000-5000 | 3.2-4.8 | ||
| 5000-6000 | 3.0-4.6 | ||
| 6000-7000 | 2.9-4.5 | ||
| 7000-8000 | 2.8-4.3 | ||
| 8000-9000 | 2.6-4.2 | ||
| 9000-10,000 | 2.5-4.0 | ||
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OXYGEN SENSOR VOLTAGE TEST (1)
| Condition | Volts | ||
|---|---|---|---|
| Lean | .1 | ||
| Rich | .9 | ||
|
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RENDER: 1.0x
NO RELATED
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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.