1993 Infiniti G20 AutomaticFACTORY OEM SERVICE PROCEDURE

Sensor Range Charts

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: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
COOLANT TEMPERATURE SENSOR RESISTANCE (1)

Temperature - °F (°C) Ohms
68 (20) 2100-2900
122 (50) 680-1000
176 (80) 300-330
(1) Measure resistance across sensor terminals.
EGR TEMPERATURE SENSOR RESISTANCE (1)

Temperature - °F (°C) Ohms
212 (100) 76,770-93,830
(1) Heat sensor in water and measure resistance across sensor terminals.
FUEL TEMPERATURE SENSOR RESISTANCE (M30 & Q45) (1)

Temperature - °F (°C) Ohms
68 (20) 2100-2900
122 (50) 680-1000
176 (80) 300-330
(1) Measure resistance between sensor terminals at pressure regulator.
HEATED OXYGEN SENSOR VOLTAGE (1)

Condition Volts
Lean 0-0.3
Rich 0.6-1.0
(1) Measure voltage between oxygen sensor terminal and ground, voltage should continuously change. Measure heater resistance between terminals "A" and "C" at sensor. Resistance should be 3-1000 ohms.
CLOSED & WIDE OPEN THROTTLE SWITCH CONTINUITY (1) (G20) (2)

Position Reading
Closed Throttle Blue/Orange & White Green
Wide Open Throttle Blue/Orange & Blue Red
(1) Continuity should be present between terminals identified by wire color.
(2) Applicable to A/T vehicles produced from serial No. 450021 and later.
CLOSED THROTTLE POSITION SWITCH CONTINUITY (J30 & Q45) (1)

Position Reading
Closed Throttle Continuity
Open Throttle No Continuity
(1) Check continuity between terminals No. 2 and 3 at sensor. See Fig 1 .
THROTTLE POSITION SENSOR RESISTANCE (1)

Position Ohms
G20
Closed Throttle 2000
Partially Open 2000-10,000
Wide Open Throttle 10,000
J30
Closed Throttle 1700
Partially Open 1700-10500
Wide Open Throttle 10500
Q45
Closed Throttle 700
Partially Open 700-5000
Wide Open Throttle 5000
(1) Measure resistance between terminals No. 4 and 5 at sensor. See Fig 1 .
MASS AIRFLOW SENSOR VOLTAGE (LOW RPM) (1)

Application Terminal No Volts
G20 "A" 1.3-1.7
J30 "B" 1.0-1.4
Q45 "1" 1.0-1.4
(1) Measure voltage between ground and indicated airflow meter terminal with engine idling at normal operating temperature.
MASS AIRFLOW SENSOR VOLTAGE (HIGH RPM) (1)

Application Terminal No Volts
G20 "A" 1.7-2.1
J30 "B" 1.4-1.9
Q45 "1" 1.4-1.9
(1) Measure voltage between ground and indicated airflow meter terminal with engine running at 2000 RPM at normal operating temperature.
Fig 1: Throttle Position Sensor/Closed Throttle Switch Terminal ID
G90A15222Courtesy of NISSAN MOTOR CO., U.S.A.
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