Engine Controls - Sensor Operating Range Charts - G20 & Q45: Introduction

NOTE: For sensor operating range charts on I35, refer to Maxima in Nissan SENSOR OPERATING RANGE CHARTS article. For sensor operating range charts on QX4, refer to Pathfinder in Nissan SENSOR OPERATING RANGE CHARTS article.

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.

CAUTION: DO NOT use ECM ground terminals when measuring voltage.

NOTE: For sensors not listed, see appropriate DTC test in appropriate SELF-DIAGNOSTICS article.

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

ACCELERATOR PEDAL POSITION SENSOR VOLTAGE (Q45)

Application

Volts

APP Sensor No. 1 ⁽¹⁾

Fully Released

More Than .36

Fully Depressed

Less Than 4.75

APP Sensor No. 2 ⁽²⁾

Fully Released

More Than .18

Fully Depressed

Less Than 2.37

⁽¹⁾	Measured between ground and ECM terminal No. 87 by backprobing.

⁽²⁾	Measured between ground and ECM terminal No. 117 by backprobing.

CRANKSHAFT POSITION SENSOR RESISTANCE

Application

Ohms @ 68°F (20°C)

G20

166-204

Q45

⁽¹⁾

⁽¹⁾	Resistance specification is not available from manufacturer.

ENGINE COOLANT TEMPERATURE SENSOR SPECIFICATIONS

Temperature °F (°C)

Volts ⁽¹⁾

Resistance Ohms

14 (-10)

4.4

7000-11,400

68 (20)

3.5

2100-2900

122 (50)

2.2

680-1000

194 (90)

1.0

236-260

⁽¹⁾	Measured between ground and ECM terminal No. 70 (on G20), or No. 121 (on Q45) by backprobing.

EGR TEMPERATURE SENSOR SPECIFICATIONS (G20)

Temperature °F (°C)

Volts

Resistance - K/Ohms

32°F (0°C)

4.56 ⁽¹⁾

730-890

122°F (50°C)

2.25 ⁽¹⁾

74-82

212°F (100°C)

0.59 ⁽¹⁾

12-14

⁽¹⁾	Measured between ground and ECM terminal No. 72 by backprobing.

FUEL TANK TEMPERATURE SENSOR SPECIFICATIONS

Temperature °F (°C)

Volts ⁽¹⁾

Resistance Ohms

68 (20)

3.5

2300-2700

122 (50)

2.2

790-900

⁽¹⁾	Measured between ground and ECM terminal No. 82 (on G20), or No. 92 (on Q45) by backprobing.

HEATED OXYGEN SENSOR VOLTAGE ⁽¹⁾

Condition

Volts

Lean

0-0.3

Rich

0.6-1.0

⁽¹⁾	Reading displayed on an OBD-II scan tool. For complete HO2S sensor testing, see appropriate test under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.

HEATED OXYGEN SENSOR HEATER RESISTANCE @ 77°F (25°C)

Application

Ohms

Front & Rear

⁽¹⁾ 2.3-4.3

⁽¹⁾	Measure resistance between appropriate HO2S terminals. For complete HO2S sensor testing, see appropriate test under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.

INTAKE AIR TEMPERATURE SENSOR SPECIFICATIONS

Temperature °F (°C)

Volts ⁽¹⁾

Resistance Ohms

G20

68 (20)

3.50

2100-2900

176 (80)

1.23

270-380

Q45

77 (25)

3.32

1900-2100

176 (80)

1.23

310-370

⁽¹⁾	Measured between ground and ECM terminal No. 64 (on G20), or No. 99 (on Q45) by backprobing.

MASS AIRFLOW SENSOR VOLTAGE SPECIFICATIONS ⁽¹⁾

Application

Volts

G20

Key On, Engine Off

⁽²⁾ Less Than 1.0

Idle

⁽²⁾ 1.3-1.7

2500 RPM

⁽²⁾ 1.8-2.4

Q45

Key On, Engine Off

⁽³⁾ About 1.0

Idle

⁽³⁾ 1.1-1.5

2500 RPM

⁽³⁾ 1.7-2.4

⁽¹⁾	With engine at normal operating temperature.

⁽²⁾	Measured between ground and ECM terminal No. 61 by backprobing.

⁽³⁾	Measured between ground and ECM terminal No. 91 by backprobing.

RADIATOR COOLANT TEMPERATURE SENSOR SPECIFICATIONS (Q45)

Temperature °F (°C)

Volts ⁽¹⁾

Resistance Ohms

14 (-10)

4.4

9017-9723

68 (20)

3.5

2437-2595

194 (90)

0.9

242-258

230 (110)

0.64

145-152

302 (150)

0.32

59-63

⁽¹⁾	Measured between ground and ECM terminal 122 by backprobing.

THROTTLE POSITION SENSOR VOLTAGE (G20)

Application

⁽¹⁾ Volts

Completely Released

0.2-0.8

Partially Released

0.2-0.8 To 3.5-4.5

Completely Depressed

3.5-4.5

⁽¹⁾	Measured between ground and ECM terminal No. 92 by backprobing.

THROTTLE POSITION SENSOR VOLTAGE (Q45)

Application

Volts

TP Sensor No. 1 ⁽¹⁾

Fully Released

More Than .36

Fully Depressed

Less Than 4.75

TP Sensor No. 2 ⁽²⁾

Fully Released

Less Than 4.75

Fully Depressed

More Than .36

⁽¹⁾	Measured between ground and ECM terminal No. 108 by backprobing.

⁽²⁾	Measured between ground and ECM terminal No. 98 by backprobing.