Engine Controls - Sensor Operating Range Charts: 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 may cause driveability problems.

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

CRANKSHAFT POSITION SENSOR RESISTANCE

System

Ohms

9-3

Trionic T-5 Engine Mnagement System

⁽¹⁾ 485-595

Trionic T-7 Engine Management System

⁽²⁾ 770-950

9-5

⁽²⁾ 770-950

⁽¹⁾	Measure resistance between sensor terminals No. 1 (Yellow wire) and 2 (Black wire) at around 68°F (20°C).

⁽²⁾	Measure resistance between both sensor terminals at around 68°F (20°C).

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Ohms

-22 (-30)

20,000-30,000

-14 (-10)

7000-11,400

68 (20)

2100-2900

104 (40)

1000-1300

140 (60)

565-670

176 (80)

295-365

194 (90)

240-260

230 (110)

140-160

⁽¹⁾	Measure resistance between sensor terminals.

HEATED OXYGEN SENSOR (HO2S) VOLTAGE

Condition	Volts
Lean	.1-0.4
Rich	0.6-0.9

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Ohms

-22 (-30)

20,000-30,000

14 (-10)

7000-11,400

68 (20)

2100-2900

104 (40)

1000-1300

140 (60)

565-670

176 (80)

295-365

194 (90)

240-260

⁽¹⁾	Measure resistance between sensor terminals.

MASS AIR FLOW FREQUENCY ⁽¹⁾

Air Flow (Grams/Second)

Frequency (Hertz)

100-300

1045

1.5

1312

1527

3.5

2012

2355

7.5

2788

3134

3678

4095

4764

5289

5730

6114

6753

100

7286

120

7743

140

8158

⁽¹⁾	Connect oscilloscope at MAF sensor to Green/Blue wire on 9-3 or Pink/White wire on 9-5 Series. Use scan tool to monitor air flow.

MAP SENSOR VOLTAGES - 9-3 SERIES WITH TRIONIC T-5

Vacuum/Pressure Applied			Voltage Readings
Vacuum Applied (In. Hg)
20.1			0.48
13.4			0.95
0.0			1.9
Pressure Applied (psi)
3.6			2.4
7.3			2.8
10.9			3.3

MAP/CAAP SENSOR VOLTAGES - 9-3 TRIONIC T-7 & 9-5 ⁽¹⁾

Vacuum/Pressure Readings

Voltage Reading

Vacuum Applied (In. Hg)

20.1

0.9

13.4

1.3

0.0

2.1

Pressure Applied (psi)

3.6

2.5

7.3

2.9

3.3

⁽¹⁾	Connect DVOM to ground with one lead, and backprobe Yellow/Red wire on CAAP sensor, or Brown/Orange wire on MAP sensor with the other lead

THROTTLE POSITION SENSOR RESISTANCE/VOLTAGE - 9-3 TRIONIC T-5

Sensor/Connector Pins No.

K/Ohms ⁽¹⁾

⁽²⁾ Volts

1 (White/Black wire) - 2 (Black Wire)

1.6-2.4

4.9-5.1

2 (Black Wire) - 3 (Green/Black Wire) With Throttle Closed

0.8-1.2

0.1-0.9

2 (Black Wire) - 3 (Green/Black wire) At Wide-Open Throttle

2.0-3.0

4.1-4.9

⁽¹⁾	Measure at sensor terminals with harness connector removed.

⁽²⁾	Backprobe sensor harness connector with ignition on.

THROTTLE/PEDAL POSITION SENSOR VOLTAGES - 9-3 TRIONIC T-7 & 9-5

Sensor - Throttle/Pedal Position	Backprobe Terminals No.	Voltage
Throttle Position Sensor 1
Closed	6-9	0.065-1.090
Open	6-9	3.930-4.775
Throttle Position Sensor 2
Closed	8-9	3.910-4.935
Open	8-9	0.025-1.070
Pedal Position Sensor 1
Released	1-9	3.990-4.645
Depressed	1-9	0.400-1.055
Pedal Position Sensor 2
Released	3-9	0.355-1.010
Depressed	3-9	3.945-4.600