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HOMESERVICE MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN PASSENGER, 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - SENSOR RANGE CHARTSINTRODUCTION
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 J

Engine Controls - Sensor Range Charts: Introduction

2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 JSECTION 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.
DFT (1), ECT (2) & IAT (3) SENSOR RESISTANCE (EXCEPT TRACKER)

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) Diesel Fuel Temperature (DFT) sensor.
(2) Engine Coolant Temperature (ECT) sensor.
(3) Intake Air Temperature (IAT) sensor.
(4) Measure resistance across sensor terminals.
ECT & IAT SENSOR RESISTANCE (TRACKER)

Temperature - °F (°C) (1) 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) Measure resistance across sensor terminals.
FUEL PRESSURE SENSOR VOLTAGE (5.0L & 5.7L - 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 RESISTANCE (5.0L & 5.7L - CNG)

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

Throttle Position (1) Volts
At Idle 1.0-1.5
Wide Open Throttle 4.0-4.9
(1) Measured at sensor, or as seen on scan tool. Ensure sensor output changes instantly when intake manifold vacuum is applied and released.
OXYGEN SENSOR VOLTAGE

Condition (1) Volts
Lean .1
Rich .9
(1) Measure voltage between oxygen sensor ground and signal terminals at PCM/VCM.
THROTTLE POSITION SENSOR VOLTAGE

Throttle Position (1) Volts
At Idle 0.6
Wide Open Throttle Greater Than 4.0
(1) Measured at sensor, or as seen on scan tool.
RENDER: 1.0x

NO RELATED

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  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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