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: 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.

CAMSHAFT POSITION (CMP) SENSOR

Application

Specification

G20

POS

Idle

⁽¹⁾ About 2.5 Volts

2000 RPM

⁽¹⁾ About 2.4 Volts

REF

⁽²⁾ 0.1-0.4 Volts

I30

Hitachi

1440-1760 Ohms @ 68°F (20°C)

Mitsubishi

2090-2550 Ohms @ 68°F (20°C)

Q45

POS

Idle

⁽³⁾ About 2.5 Volts

2000 RPM

⁽³⁾ About 2.4 Volts

REF

Idle

⁽⁴⁾ About 0.6-1.0 Volts

2000 RPM

⁽⁴⁾ About 0.8-0.9 Volts

⁽¹⁾	Measured between ground and PCM harness connector terminal No. 41 by backprobing.

⁽²⁾	Measured between ground and PCM harness connector terminal No. 40 or 44 by backprobing.

⁽³⁾	Measured between ground and PCM harness connector terminal No. 59 by backprobing.

⁽⁴⁾	Measured between ground and PCM harness connector terminal No. 55 or 58 by backprobing.

CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE

Application

Specification

G20

166-204 Ohms @ 77°F (25°C)

I30

⁽¹⁾

Q45

166.5-203.5 Ohms @ 68°F (20°C)

⁽¹⁾	See DTC P0335 OR P1336: CRANKSHAFT POSITION (CKP) SENSOR in SELF-DIAGNOSTICS - I30 article.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature	Ohms
68°F (20°C)	2100-2900
122°F (50°C)	680-1000
194°F (90°C)	236-260

EGR TEMPERATURE SENSOR RESISTANCE ⁽¹⁾

Application

K/Ohms

G20

32°F (0°C)

7900-9700

122°F (50°C)

570-700

212°F (100°C)

80-100

I30 & Q45

32°F (0°C)

680-1110

122°F (50°C)

92-120

212°F (100°C)

17-24

⁽¹⁾	Heat sensor in water and measure resistance across sensor terminals.

HEATED OXYGEN SENSOR (HO2S) 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 DTC test in appropriate SELF-DIAGNOSTICS article.

HEATED OXYGEN SENSOR (HO2S) HEATER RESISTANCE @ 77°F (25°C)

Condition

Ohms

Front & Rear

⁽¹⁾ 2.3-4.3

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

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE

Temperature	Ohms
68°F (20°C)	2100-2900
176°F (80°C)	270-380

MASS AIRFLOW (MAF) 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

I30

Key On, Engine Off

⁽³⁾ Less Than 1.0

Idle

⁽³⁾ 1.0-1.7

2500 RPM

⁽³⁾ About 2.1

Q45

Key On, Engine Off

⁽⁴⁾ Less Than 1.0

Idle

⁽⁴⁾ 1.0-1.7

2500 RPM

⁽⁴⁾ 1.5-2.1

⁽¹⁾	With engine at normal operating temperature.

⁽²⁾	Measured between ground and PCM harness connector terminal No. 47 by backprobing.

⁽³⁾	Measured between ground and PCM harness connector terminal No. 54 by backprobing.

⁽⁴⁾	Measured between ground and PCM harness connector terminal No. 65 by backprobing.

THROTTLE POSITION (TP) SENSOR VOLTAGE

Application

Volts

G20

Completely Released

⁽¹⁾ 0.2-0.8

Partially Released

⁽¹⁾ 0.2-0.8 To 3.5-4.5

Completely Depressed

⁽¹⁾ 3.5-4.5

I30

Completely Released

⁽¹⁾ 0.35-0.65

Partially Released

⁽¹⁾ 0.35-0.65 To About 4 Volts

Completely Depressed

⁽¹⁾ About 4 Volts

Q45

Completely Released

⁽²⁾ 0.15-0.85

Partially Released

⁽²⁾ 0.15-0.85 To 3.5-4.7

Completely Depressed

⁽²⁾ 3.5-4.7

⁽¹⁾	Measured between ground and PCM harness connector terminal No. 23 by backprobing.

⁽²⁾	Measured between ground and PCM harness connector terminal No. 63 by backprobing.

SECONDARY TP SENSOR RESISTANCE (Q45)

Secondary Throttle Valve Position	Ohms @ 77°F (25°C)
Fully Open	About 5000
Partially Open	600-4000
Fully Closed	About 600