Why does my Miata engine have no spark?
Check cylinders one and two. One and Four share the same coil and 2 and 3 share the same coil. If you have no spark on either one or two, start suspecting Crank Angle Sensor or CKP sensor on crank. The CKP on these engines is primarily used for misfire counting, but I have good reason to believe that the ECU uses this signal for spark timing, too.
What are the possible causes of a p0339 code?
P0339 Possible Causes. Faulty crankshaft position sensor. Crankshaft position sensor harness is open or shorted. Crankshaft position sensor circuit poor electrical connection. Signal plate may be damage. Starter motor may be faulty. Starting system circuit. Dead or weak battery.
Why does the fuel pump not come on in a Miata?
The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay. In a condition where you have no RPM signal from the CAS the pump won’t come on. But lets make this as easy as possible. We know we have injector pulse, we know we have spark, and we know the cam is spinning.
Where are the control wires on a Miata?
Each injector has two wires, a power wire and a ground control wire that goes to the ECU. The power wires will be the same color on each injector. The control wires are different colors. Backprobe a control wire with your test light, other end clipped to ground, and crank the engine.
What does the code p0335 mean on a car?
This is a fairly common question among vehicle owners who own a car with an OBD-II equipped vehicle. Essentially, this code refers to an issue in the crankshaft location or its relays. The crankshaft position sensor is a stationary piece, but it works with the reluctor ring to determine positioning and voltage.
What does the crank position sensor on a Miata do?
February 10, 2019 by Jason The Mazda Miata utilizes a crankshaft position sensor in order to regulate the engine timing. This sensor uses a reluctor to gauge the position of the crank. When the Miata’s ECM determines that there is an issue with the signal coming from this sensor, it’ll throw the P0335 trouble code.
Why do I have a p0339 code on my crankshaft?
Perhaps the most common mistake made when diagnosing the P0339 code is assuming that the problem is the crankshaft position sensor itself and not performing a complete diagnosis. One of the most common reasons for the P0339 code is actually damage to the wiring harness due to exposure to engine oil.
How to check the crank sensor on a Renault p0335?
Using a scan tool, check if, when engine is running or cranking, that there is an RPM signal. If there is no RPM reading, then visually inspect the crank sensor and connector for any damage and repair as necessary. If there is no visible damage, and you have access to a scope, you could check the CKP 5 Volt square wave pattern.