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 diagnostic trouble code, but it may cause driveability problems.

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 VOLTAGE

ECM Terminal ⁽¹⁾

⁽²⁾ Voltage

SGT Signal

5 (4 pulses/rev)

SGC Signal

5 (2 pulses/rev)

⁽¹⁾	See PIN VOLTAGE CHART S article for terminal identification.

⁽²⁾	Rotate sensor by hand while measuring output voltage.

CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE

Terminals ⁽¹⁾

Temperature

Ohms

"A" & "B"

68°F (20°C)

500-600

⁽¹⁾	See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature	Ohms
68°F (20°C)	2200-2700
176°F (80°C)	287-349

EGR BOOST SENSOR VOLTAGE

Vacuum	Voltage
29.9 in. Hg	4.0

EGR VALVE POSITION SENSOR VOLTAGE

Vacuum	Voltage
0 in. Hg	0.8
5.04 in. Hg	4.9

HEATED OXYGEN SENSOR

Operating Condition	Volts
Acceleration	0.5-1.0
Deceleration	0.0-0.5

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE

Temperature

⁽¹⁾ Ohms

68°F (20°C)

2200-2700

⁽¹⁾	Measure between mass airflow sensor terminals "C" and "D". See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.

MASS AIRFLOW (MAF) SENSOR VOLTAGE

Terminal ⁽¹⁾

Ignition On Volts

Engine Running Volts

"A" (Power Supply)

12.0

"B" (Signal)

0.5-1.0

1.0-2.0

"D" (Ground)

"E" (Ground)

⁽¹⁾	See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.

TP SENSOR VOLTAGE

ECM/PCM Wire Color

Closed Throttle Volts

WOT Volts

Miata

Red/Black (3F) ⁽¹⁾

0.1-1.1

3.1-4.5

⁽¹⁾	ECM/PCM terminal pin No. in parentheses.

THROTTLE POSITION (TP) SENSOR CONTINUITY

Condition ⁽¹⁾

Continuity Between Terminals "A" & "B"

.012" (.3 mm)

Yes

.016" (.4 mm)

⁽¹⁾	Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.