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First check the engine computer for fault codes, address any found. If not codes then check fuel pressure. If pressure is ok make sure fuel is being injected, if that is ok for engine mechanical issues
What make an year vehicle do you have ? A faulty sensor could bring down the 5volt reference circuit in the PCM / ECM , causing no spark ,no crank . Does the check engine light come on when you turn the key on an go off after a few seconds ? Not trying to start the vehicle , just key in the on position . As far as the TDC sensor , need to know make , model an year vehicle . They put them in different places !
Hey Bob how's it going ? What engine does it have 2.2 3.5 L ? An how did you test for current ? This is a AC voltage .
The crankshaft position (CKP) sensor is a permanent magnet generator, known as a variable reluctance sensor. The CKP sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft. The AC voltage output depends on the crankshaft position and the battery voltage. The CKP sensor works in conjunction with a 7X reluctor wheel attached to the crankshaft. The CKP sensor produces seven pulses for each revolution of the crankshaft. The pulse from the 10-degree notch is known as the sync pulse. The sync pulse is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is used for ignition timing, the fuel injector timing, misfire diagnostics and tachometer display. The CKP sensor is connected to the ECM by a signal circuit and a low reference circuit.
The best way to test is with a lab scope ! Crankshaft position sensor
Did you check B+ power and ground's for the PCM ,look a wiring diagram ! Do you have access to wiring diagrams . Pin # 16 in the DLC should have B+ voltage ,does it ? This power's the scan tool . Also ,do you know anything about PCM / ECM five volt reference voltage ? This supply's a steady 5volts to engine sensors . If a sensor is shorted it will bring down the refrenece volt circuit inside the PCM/ECM causing no start condition . Does the vehicle have spark ? Did you test for a no spark condition ?
First i would check the crank sensor by looking for rpm's on the tachometer or scan tool if you see any rpm's then crank sensor is good.Then check for leaking injectors and if they are not leaking then you will need to check the ECM it may have failed.
There are two basic reasons for not starting - no spark or no fuel, both of which are controlled by the ECM. You need to check error codes and these items - for the spark, test it at the cylinder 1 sparkplug; for the fuel check the pressure (if too high or low, problem!).
try changing the ignition module thats mounted under the coil ,well it was on the kadett and the astra which came out about the same year which i think this american named vehicle did so they could be the same vehicle
SOUNDS LIKE THE CRANKSHAFT POSITION SENSOR . HAD SOME TROUBLE WITH THEM ON THE 4 CYLINDERS VEHICLE STALLS AFTER DRIVING AWHILE LET IT SIT AND WILL RESTART WILL ALSO THROW A CODE IN THE ECM FOR THIS . WHEN IT DOESNT START CHECK AND SEE IF YOU HAVE SPARK. IF THE ECM DOES NOT SEE THE CRANK SENSOR YOU WILL HAVE NO INJECTOR PULSE AND NO SPARK
The biggest issue will be with the ECM. If programming changes were made between the year models to accommodate newer sensors then you will have problems with the ECM and TCM control units. If you transfer just the motor over and leave the transmission as a standard you will reduce the probability of having these problem. The motors should be essentially the same. There maybe some changes on sensor locations and in some cases you may need to make some extenders to accommodate the different locations. The second issue with the newer motor going in to the older vehicle is the ECM being able to control the Crank Position Sensor readings and maintaining the timing as this is key to the motor running well. Again, you may be able to use the ECM from the 2001 to avoid this problem but this assumes that all other major equipment is the same. Where I am seeing the largest issue is with the Transmission. In older vehicle changes from Standard to Automatic is not an issue and vice versa but in the ECM controlled world it becomes a problem. This is sometimes resolved with a simple programming upgrade at other times the ECM is designed to handle either with no further action required. This is Vehicle make and model specific though. One manufacturer may not require any further action where another may and there is no listing of exceptions.