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.
AIRFLOW METER
| Application | Terminal No. | Voltage |
|---|
| Axxess, Pathfinder, Pickup, Stanza & 240SX | 16 | 1.0-3.0 |
| Maxima | 27 | 1.0-2.0 |
| Pulsar NX & Sentra | 15 | .5-4.0 |
| Van | 31 | 1.6-3.1 |
| 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. |
| (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. |
AIRFLOW METER VOLTAGE TEST (1)
AIR TEMPERATURE SENSOR
| Temperature °F (°C) | Volts |
|---|
| Axxess, Stanza, & 240SX |
| 68 (20) | 1.0-1.5 |
| 176 (80) | .3 |
| Pathfinder & Pickup |
| 68 (20) | 2.4 |
| 176 (80) | .3 |
| (1) With engine running, measure voltage between ground and ECU terminal No. 26. |
| (1) | With engine running, measure voltage between ground and ECU terminal No. 26. |
AIR TEMPERATURE SENSOR VOLTAGE TEST (1)
COOLANT TEMPERATURE SENSOR
| Temperature °F (°C) | Ohms |
|---|
| 68 (20) | 2100-2900 |
| 176 (80) | 300-330 |
| (1) Measure resistance across sensor terminals. |
| (1) | Measure resistance across sensor terminals. |
COOLANT TEMPERATURE SENSOR RESISTANCE TEST (1)
EXHAUST GAS TEMPERATURE SENSOR
| Application | Terminal No. | Volts w/EGR Closed | Volts w/EGR Open |
|---|
| Axxess, Stanza & 240SX | 8 | 1.0 or more | 0-1.0 |
| Maxima | 39 | 1.0 or more | 0-1.0 |
| Pathfinder & Pickup |
| 2.4L | 8 | 3.0-4.0 | 0-3.0 |
| 3.0L | 8 | 1.0 or more | 0-1.0 |
| Pulsar NX & Sentra | 7 | 1.0 or more | 0-1.0 |
| Van | 111 | 1.0 or more | 0-1.0 |
| 300ZX | 39 | 4.5 or less | 0-1.0 |
| (1) With engine running, measure voltage between ground and indicated ECU terminal. |
| (1) | With engine running, measure voltage between ground and indicated ECU terminal. |
EXHAUST GAS TEMPERATURE SENSOR VOLTAGE TEST (1)
FUEL TEMPERATURE SENSOR
| Application | Terminal No. | Volts |
|---|
| 300ZX | 36 | 0-5.0 |
| (1) With engine running, measure voltage between ground and indicated ECU terminal. |
| (1) | With engine running, measure voltage between ground and indicated ECU terminal. |
FUEL TEMPERATURE SENSOR VOLTAGE TEST (1)
NEUTRAL/INHIBITOR SWITCH
| Application | Terminal No. | Volts In Park/Neutral | Volts In All Other Positions |
|---|
| Axxess | 35 | 0 | Battery |
| Maxima | 44 | Battery | 0 |
| Pathfinder, Pickup, Stanza & 240SX | 35 | 0 | 6.0-7.0 |
| Pulsar NX & Sentra | 36 | 0 | 6.0-7.0 |
| Van | (2) | (2) | (2) |
| 300ZX | 44 | 0 | 8.0-9.0 |
| (1) Turn ignition on. Check voltage between ground and indicated ECU terminal with transmission in indicated position. (2) Information not available from manufacturer for inhibitor switch testing (automatic transmission). See SYSTEM/COMP TESTS article. |
| (1) | Turn ignition on. Check voltage between ground and indicated ECU terminal with transmission in indicated position. |
| (2) | Information not available from manufacturer for inhibitor switch testing (automatic transmission). See SYSTEM/COMP TESTS article. |
NEUTRAL/INHIBITOR SWITCH TEST (1)
EXHAUST GAS (OXYGEN) SENSOR
| Condition | Volts |
|---|
| Lean | .1 |
| Rich | 1.0 |
| (1) With engine running at normal operating temperature, measure voltage between oxygen sensor connector terminal and ground. |
| (1) | With engine running at normal operating temperature, measure voltage between oxygen sensor connector terminal and ground. |
EXHAUST GAS (OXYGEN) SENSOR VOLTAGE TEST (1)
THROTTLE POSITION SENSOR
| Application | Terminal No. | Volts |
|---|
| Axxess, Stanza & 240SX | 20 | .4-4.0 |
| Maxima | 38 | .5-4.0 |
| Pathfinder & Pickup | 20 | .5-4.0 |
| Pulsar NX & Sentra | 19 | .4-4.0 |
| Van | 19 | .5-4.0 |
| 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. |
| (1) | Turn ignition on. Measure voltage between ground and indicated ECU terminal. Observe voltage while opening and closing throttle valve. |
THROTTLE POSITION SENSOR VOLTAGE TEST (1)
VEHICLE SPEED SENSOR
| Application | Terminal No. | Specification |
|---|
| Axxess, Pathfinder, Pickup, Stanza & 240SX | 32 | (1) |
| Maxima & 300ZX | 53 | (1) |
| Pulsar NX & Sentra | 33 | (1) |
| Van | 29 | (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. |
| (1) | Disconnect ECU connector. Check continuity between ground and indicated ECU terminal while turning drive wheels. Ohmmeter reading should fluctuate between continuity and infinity. |
VEHICLE SPEED SENSOR GROUND CONTINUITY TEST
