Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSNISSAN-DATSUN1991240SX LE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSOPTICAL (300ZX)CRANK ANGLE SENSOR
1991 Nissan-Datsun 240SX LE, Standard
Crank Angle Sensor
1991 Nissan-Datsun 240SX LE, StandardSECTION Crank Angle Sensor
- If a fault is present in crank angle sensor, Code 11 may be set in ECU memory. If Code 11 is set, perform appropriate CODE 11 (CRANK ANGLE SENSOR) test in TESTS W/CODES article.
- To test crank angle sensor, leave sensor wiring connected. Using a logic probe or DVOM with an analog bar graph function, connect negative lead to ground and alternately connect positive lead to terminals No. 42 and 52 of ECU connector (1-degree input signal). Crank the engine and note voltage pulse signals. For ECU connector terminal identification, see appropriate diagram in WIRING DIAGRAMS article.
- Alternately probe ECU connector terminals No. 41 and 51 (120-degree input signals). Crank engine and note voltage pulse signals.
- Peak voltage for 1-degree signal should measure about 2.5-2.7 volts on bar graph DVOM. Peak voltage for 120-degree signal should measure about 1.2-1.4 volts. If 1-degree or 120-degree signal is not present, check harness for short or open circuit. If no problems are found, replace crank angle sensor.
NOTE:
It is possible to measure crank angle sensor voltage with a conventional DVOM (no bar graph function); however, it may not be easy to determine peak voltage signal due to the "averaging" of digital signal.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.