Binding in linkage or cable due to corrosion.The sudden onset of a slipping clutch usually indicates that an oil leak, or something else has contaminated the friction surfaces. Friction discs wear and get thinner, and springs get weaker with time and use, which is why all clutches eventually start to slip. If the spring pressure is not great enough, or the clearance between all the parts is too great, there won't be enough friction to transmit the power from the motor to the transmission. When you press the clutch, your foot counters the diaphragm spring which presses the friction disc to the flywheel. In the TEST 3 section of this article, I'll show how you just how to test this so that you can confirm that your Nissan pickup's MAF sensor is bad or not.A clutch that doesn't engage fully, or slips under heavy load, is the normal failure mode of a worn out friction disc of pressure plate that has lost its tension. When testing this DC voltage MAF signal, the important thing to know is not an actual Volts DC number at a specific RPM, but to look for crazy and extreme fluctuations in the MAF voltage signal that don't correspond to the actual air intake (RPMs) of the engine or NO SIGNAL AT ALL. To be a little more specific since D21's four cylinder engine will breathe in more air at, let's say, 2,500 RPMs than when it's sitting at an idle of 900 RPMs this will cause the MAF sensor to send a higher DC voltage signal to the computer than at idle. And this measurement of the air flow is sent to the D21's fuel injection computer as an analog DC voltage signal. The mass air flow (MAF) sensor's job is to measure the amount of air that the engine is breathing. Independent of the method you use, be careful not to damage the wire(s). If you need to see what this tool looks like, click here: Wire-Piercing Probe. I recommend using a wire-piercing probe to test the signals in the wires, since this method will be the most effective and easiest way of getting to the signal. Here's the description of each circuit below: I'll be using these letters for the circuit descriptions. You'll notice that the photos (in the image viewer) have the MAF connectors lettered A thru' C (if you look closely at the MAF sensor itself on your D21 pickup, you'll see these letters on it too). The mass air flow sensor on your Nissan D21 pickup has three wires attached to it. Circuit Descriptions Of The Nissan MAF Sensor Connector I would also recommend using a wire-piercing probe to to test the signal of each wire (to see what this tool looks like, click here: Wire-Piercing Probe. A scan tool (automotive diagnostic scanner) is not needed. The most important tool that you're gonna' need is a digital multimeter (or an analog multimeter), this bad boy doesn't have to be an expensive one. A tremendous lack of power upon acceleration.MAF sensor malfunction that DOES NOT light up the check engine light (CEL).MAF codes that light up the check engine light (CEL) on your instrument cluster.This list covers the majority of symptoms I've seen with this type of Nissan mass air flow sensor: Common Symptoms Of A Bad Nissan MAF Sensor You can find this tutorial in Spanish here: Prueba: Sensor de Flujo de Aire (MAF) 2.4L Nissan D21 Hard Body (1990-1995) (at: ).
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