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Engine Controls - Sensor Operating Range Charts 3.0L: 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: Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. To identify ECU terminals, see wiring diagram in WIRING DIAGRAMS article.
CAMSHAFT POSITION SENSOR VOLTAGE TEST (1)

Application Wire Color (1-Degree Signal) Wire Color (120/180-Degree Signal)
300ZX (2) Green/Yellow Green/Black
(1) Measure voltage between indicated wire color terminals.
(2) Voltage should fluctuate between zero and 5 volts.
CLOSED THROTTLE POSITION SWITCH CONTINUITY (1)

Application Wire Colors
300ZX Green/Red & Light Green/Red
(1) Continuity should exist with throttle valve fully closed, and no continuity with throttle valve off idle position.
ENGINE (COOLANT) TEMPERATURE SENSOR RESISTANCE

Temperature - °F (°C) Ohms
68 (20) 2100-2900
122 (50) 680-1000
176 (80) 300-330
194 (90) 236-260
EXHAUST GAS TEMPERATURE SENSOR RESISTANCE

Temperature - °F (°C) Ohms
212 (100) 76,770-93,830
FUEL TEMPERATURE SENSOR RESISTANCE

Temperature - °F (°C) Ohms
68 (20) 2100-2900
122 (50) 680-1000
176 (80) 300-330
KNOCK (DETONATION) SENSOR RESISTANCE @ 77°F (25°C)

Application Ohms
300ZX Continuity To Ground
MASS AIRFLOW SENSOR VOLTAGE TEST (1)

Application (2) Volts With KOEO Volts At Idle
300ZX 0.8 0.8-1.5
(1) Values are approximate and vary with engine RPM.
(2) Key On, Engine Off.
OXYGEN SENSOR HEATER ELEMENT RESISTANCE @ 77°F (25°C)

Application Ohms
300ZX 3-1000
THROTTLE POSITION SENSOR RESISTANCE TEST

Application Wire Colors k/Ohms
300ZX Black & White 1.0-9.0
VEHICLE SPEED SENSOR

Application (1) AC Voltage
300ZX 0.5
(1) Measured while rotating sensor shaft by hand, check AC voltage across sensor connector terminals.