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 MANUALSCHEVROLET2002MALIBU LSREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEM - SENSOR RANGE CHARTSINTRODUCTION

2002 Chevrolet Malibu LS

Engine Control System - Sensor Range Charts: Introduction

2002 Chevrolet Malibu LSSECTION 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: Unless stated otherwise in test procedure, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.

ECT & IAT ⁽¹⁾⁽²⁾ SENSOR RESISTANCE (1.8L)

Temperature - °F (°C)

⁽³⁾ Ohms

176 (80)

315

158 (70)

435

140 (60)

580

122 (50)

810

113 (45)

940

104 (40)

1150

95 (35)

1360

86 (30)

1600

77 (25)

2000

68 (20)

2400

59 (15)

3000

50 (10)

3600

41 (5)

4600

32 (0)

5700

23 (-5)

7400

14 (-10)

9800

5 (-15)

12,700

-4 (-20)

16,000

⁽¹⁾	Engine Coolant Temperature (ECT) sensor.

⁽²⁾	Intake Air Temperature (IAT) sensor.

⁽³⁾	Measure resistance across sensor terminals.

ECT, IAT & TFT ⁽¹⁾⁽²⁾⁽³⁾ SENSOR RESISTANCE (EXCEPT 1.8L)

Temperature - °F (°C)

⁽⁴⁾ Ohms

212 (100)

177

194 (90)

241

176 (80)

332

158 (70)

467

140 (60)

667

122 (50)

973

113 (45)

1188

104 (40)

1459

95 (35)

1802

86 (30)

2238

77 (25)

2796

68 (20)

3520

59 (15)

4450

50 (10)

5670

41 (5)

7280

32 (0)

9420

23 (-5)

12,300

14 (-10)

16,180

5 (-15)

21,450

-4 (-20)

28,680

-22 (-30)

52,700

-40 (-40)

100,700

⁽¹⁾	Engine Coolant Temperature (ECT) sensor.

⁽²⁾	Intake Air Temperature (IAT) sensor.

⁽³⁾	Transaxle Fluid Temperature (TFT) sensor.

⁽⁴⁾	Measure resistance across sensor terminals.

FUEL PRESSURE SENSOR VOLTAGE (2.2L - CNG)

psi (kPa)	Volts
0 (0)	0.50
125 (862)	0.63
438 (3021)	0.94
750 (5172)	1.25
1063 (7331)	1.56
1375 (9483)	1.88
1688 (11,641)	2.19
2000 (13,793)	2.50
2313 (15,952)	2.81
2625 (18,103)	3.13
2938 (20,262)	3.44
3250 (22,414)	3.75
3563 (24,572)	4.06
3875 (26,724)	4.38
4000 (27,586)	4.54

FUEL TEMPERATURE SENSOR (2.2L - CNG)

Temperature - °F (°C)	Ohms	Volts
302 (150)	77	0.14
248 (120)	147	0.26
212 (100)	240	0.40
176 (80)	414	0.66
158 (70)	556	0.84
140 (60)	758	1.08
122 (50)	1052	1.39
113 (45)	1249	1.57
104 (40)	1489	1.76
95 (35)	1784	1.97
86 (30)	2148	2.20
77 (25)	2600	2.43
68 (20)	3167	2.68
59 (15)	3881	2.93
50 (10)	4764	3.18
41 (5)	5933	3.42
32 (0)	7407	3.65
23 (-5)	9311	3.86
-4 (-20)	19,326	4.38
-40 (-40)	57,536	4.77
-58 (-50)	104,390	4.87

MAP SENSOR VOLTAGE (1.9L)

Altitude Feet

⁽¹⁾ 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

⁽¹⁾	Measured at sensor or as seen on scan tool.

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.