Sensor Operating Range Charts

CAMSHAFT SENSOR RESISTANCE

Application

Ohms

Cold ⁽¹⁾

835-1400

⁽¹⁾	Sensor temperature of 14-122°F (-10-50°C).

COLD START INJECTOR RESISTANCE

Application	Ohms
SC400	2-4

COLD START INJECTOR TIME SWITCH RESISTANCE

Terminals No.	Temp. °F (°C)	Ohms
1 (STA) & 2 (STJ)	Less Than 59 (15)	25-45
1 (STA) & 2 (STJ)	More Than 86 (30)	65-85
1 (STA) & Switch Body	N/A	25-85

CRANKSHAFT SENSOR RESISTANCE

Application

Ohms

Cold ⁽¹⁾

835-1400

Hot ⁽²⁾

1060-1645

⁽¹⁾	Sensor temperature of 14-122°F (-10-50°C).

⁽²⁾	Sensor temperature of 123-212°F (51-100°C).

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temp. °F (°C)	Ohms
-4° (-20)	10,000-20,000
32 (0)	4000-7000
68 (20)	2000-3000
104 (40)	900-1300
140 (60)	400-700
176 (80)	200-400

EGR GAS TEMPERATURE SENSOR RESISTANCE

Temp. °F (°C)	Ohms
122 (50)	64,000-97,000
212 (100)	11,000-16,000
302 (150)	2000-4000

NOTE: Intake Air Temperature (IAT) sensor is part of volume airflow sensor.

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE ⁽¹⁾

Ambient Temp. °F (°C)

Ohms

-4 (-20)

10,000-20,000

32 (0)

4000-7000

68 (20)

2000-3000

104 (40)

900-1300

140 (60)

400-700

⁽¹⁾	Measure resistance between terminals THA and E2 of VAF sensor.

IDLE AIR CONTROL (IAC) VALVE RESISTANCE ⁽¹⁾

Application

Ohms

SC400

34-54

⁽¹⁾	Measure resistance between terminal B1 and terminals S1 and S3. Measure resistance between terminal B2 and terminals S2 and S4.

KNOCK SENSOR RESISTANCE ⁽¹⁾

Terminal

Ohms

Terminal To Sensor Body

Infinity (No Continuity)

⁽¹⁾	Replace sensor if continuity exists.

OXYGEN SENSOR HEATER RESISTANCE ⁽¹⁾

Application

Ohms @ 68°F (20°C)

SC400

5.1-6.3

⁽¹⁾	Measure resistance between terminals +B and HT of oxygen sensor 4-pin connector. See Fig 1.

Fig 1: Measuring Oxygen Sensor Heater Resistance (SC400)