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Home >> Nissan-Datsun >> 1991 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> Sensor Range Charts >> Engine Controls - Sensor Operating Range Charts >> Introduction
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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: All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. To identify ECU terminals, see appropriate wiring diagram in WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
AIRFLOW METER VOLTAGE TEST (1)

Application Terminal No. Volts
Maxima 27 1.0-2.0
NX & Sentra
1.6L 16 .8-3.0
2.0L 16 1.3-2.1
Pathfinder, Pickup, Stanza & 240SX 16 1.0-3.0
300ZX 27 .8-1.6
(1) Measure voltage between ground and indicated ECU terminal. Voltage should increase with an increase in airflow (RPM). DO NOT run engine at high RPM under no load.
AIR TEMPERATURE SENSOR VOLTAGE TEST (1)

Temperature °F (°C) Volts
Pickup (2.4L)
68 (20) 2.4
176 (80) .3
Stanza
68 (20) 1.0-1.5
176 (80) .3
(1) With engine running, measure voltage between ground and ECU terminal No. 26.
COOLANT TEMPERATURE SENSOR RESISTANCE TEST (1)

Temperature °F (°C) Ohms
68 (20) 2100-2900
176 (80) 300-330
(1) Measure resistance across sensor terminals.
EXHAUST GAS TEMPERATURE SENSOR VOLTAGE TEST (1)

Application Terminal No. Volts w/EGR Closed Volts w/EGR Open
Maxima 39 1.0 Or More 0-1.0
NX & Sentra
1.6L 8 2.0-4.0 0-2.0
2.0L 8 4.5 Or Less 0-1.0
Pathfinder & Pickup
3.0L 8 1.0-2.0 0-1.0
Pickup
2.4L 8 3.0-4.0 0-3.0
Stanza 8 1.0-2.0 0-1.0
240SX 8 4.5 Or Less 0-1.0
300ZX 39 4.5 Or Less 0-1.0
(1) With engine running, measure voltage between ground and indicated ECU terminal.
FUEL TEMPERATURE SENSOR VOLTAGE TEST (1)

Application Terminal No. Volts
300ZX 36 0-5.0
(1) With engine running, measure voltage between ground and indicated ECU terminal.
DETONATION (KNOCK) SENSOR VOLTAGE TEST (1)

Application Terminal No. Volts
Maxima 23 3.0-4.0
Pathfinder & Pickup (3.0L) 27 2.5
300ZX 23 2.5
(1) With engine running, check voltage between ground and indicated ECU terminal.
NEUTRAL/INHIBITOR SWITCH VOLTAGE TEST (1)

Application Terminal No. Volts In Park/Neutral Volts In All Other Positions
Maxima 44 Battery 0
NX & Sentra 35 0 Battery
Pathfinder, Pickup Stanza & 240SX 35 0 6.0-7.0
300ZX 44 0 8.0-9.0
(1) Turn ignition on. Check voltage between ground and indicated ECU terminal with transmission in indicated position.
OXYGEN SENSOR VOLTAGE TEST (1)

Condition Volts
Lean .1
Rich 1.0
(1) With engine running at normal operating temperature, measure voltage between oxygen sensor connector terminal and ground.
THROTTLE POSITION SENSOR VOLTAGE TEST (1)

Application Terminal No. Volts
Maxima 38 .5-4.2
NX & Sentra 20 .4-5.0
Pathfinder & Pickup 20 .5-4.0
Stanza 20 .4-4.0
240SX 20 .4-5.0
300ZX 38 .4-4.0
(1) Turn ignition on. Measure voltage between ground and indicated ECU terminal. Observe voltage while opening and closing throttle valve.
VEHICLE SPEED SENSOR CONTINUITY TEST

Application Terminal No. Specification
Except Maxima & 300ZX 32 (1)
Maxima & 300ZX 53 (1)
(1) Disconnect ECU connector. Check continuity between ground and indicated ECU terminal while turning drive wheels. Ohmmeter reading should fluctuate between continuity and infinity.
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