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 MANUALSCHEVROLET1995CAMARO BASE, 2D COUPE, 3.8 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 3.4LENGINE SENSORS & SWITCHESMANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (C-1)
1995 Chevrolet Camaro Base, 2D Coupe, 3.8 K
Manifold Absolute Pressure (Map) Sensor (C-1)
1995 Chevrolet Camaro Base, 2D Coupe, 3.8 KSECTION Manifold Absolute Pressure (Map) Sensor (C-1)
- A malfunction in the MAP sensor circuit should set a related diagnostic trouble code in PCM memory. If a code is present, see TESTS W/CODES - 3.4L article in this section. An out-of-calibration sensor may not set a diagnostic trouble code. Use following procedure to test sensor calibration. If driveability problems exist, MAP sensor failure is suspected and no MAP code is present, disconnect MAP sensor connector. See Fig 1 . If driveability condition improves, replace MAP sensor.
- With ignition on and engine off, check MAP sensor parameter using a scan tester connected to Data Link Connector (DLC). Voltage should be as specified. See MAP SENSOR VOLTAGE RANGE . If MAP sensor voltage is as specified, go to step 3). If voltage is not as specified, check for 5-volt reference supplied to sensor. Check harness integrity. If no problems are evident, replace MAP sensor.
- Using a hand-held vacuum pump, apply 10 in. Hg to MAP sensor, and note voltage change. Voltage should drop about 1.2-2.3 volts less than as specified in table. If voltage is not as specified or voltage reading does not immediately follow vacuum change, MAP sensor is faulty.
MAP SENSOR VOLTAGE RANGE
| 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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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.