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.
| 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. |
| (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)
| 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. |
| (1) | With engine running, measure voltage between ground and ECU terminal No. 26. |
AIR TEMPERATURE SENSOR VOLTAGE TEST (1)
| 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)
| 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. |
| (1) | With engine running, measure voltage between ground and indicated ECU terminal. |
EXHAUST GAS 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. |
| (1) | With engine running, measure voltage between ground and indicated ECU terminal. |
FUEL TEMPERATURE 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. |
| (1) | With engine running, check voltage between ground and indicated ECU terminal. |
DETONATION (KNOCK) SENSOR 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. |
| (1) | Turn ignition on. Check voltage between ground and indicated ECU terminal with transmission in indicated position. |
NEUTRAL/INHIBITOR SWITCH 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. |
| (1) | With engine running at normal operating temperature, measure voltage between oxygen sensor connector terminal and ground. |
OXYGEN 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. |
| (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)
| 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. |
| (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 CONTINUITY TEST
