1999 pontiac montana 3.4l v6 engine electrical route from the ecm to the crankshaft position sensor "a"

What size engine . 3.1 or 3.4 Has two crankshaft position sensors
Crankshaft Position (CKP) Sensor (24X)
RH side of engine at end of crankshaf, behind harmonic balencer
Engine Controls Component Views
Engine Controls Connector End Views
Crankshaft Position (CKP) Sensor (7X)
Lower rear of engine
Ignition Control (IC) Module
Top center rear of engine coils are on top of ICM - ignition control module .

Crankshaft Position (CKP) Sensor (24X)
Right side of the engine, at the end of the crankshaft, behind the harmonic balancer

How to Test the 3 8L GM Crank Sensor With Multimeter

Possible causes
- Faulty Crankshaft Position (CKP) Sensor
- Crankshaft Position (CKP) Sensor harness is open or shorted
- Crankshaft Position (CKP) Sensor circuit poor electrical connection
- Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM)

The P0727 Codes is triggered when the TCM receives no signal from the ECM.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0727 Description
The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

Should be on front of engine behind all pulleys on right side.

Place a jack underneath the engine with a block of wood on it as to not damage the engine and pump up the jack just enough to keep the engine from sagging down. Then remove the engine mount near the power steering unit. Removing the motor mount doesn't have to be done, but it makes it easier to remove the power steering pump (your choice). Remove power steering pump and set it aside keeping all the hoses attached. Camshaft position sensor is located beneath power steering pump. It should be held on by 1 bolt if I remember right. Disconnect the 2 wire harness and remove sensor.

Instructions

1. • Detach the negative battery cable from the battery of the Pontiac Montana with an open end wrench and move the cable so that it is not touching any metal objects.
   • 2Locate the alternator in the front of the engine on the passenger side of the engine compartment. The alternator will be on the top, side of the engine with a belt running to the crankshaft pulley.
     
   • 3Unfasten the electrical wire connector from the alternator by using a socket wrench to undo the nut and take the electrical wire connector off the terminal.
     
   • 4Loosen the bolts holding the alternator in place with a socket wrench just enough so that you can move the alternator on the bracket, and take the alternator belt off the pulley. Note: Do not remove the belt from the crankshaft pulley.
     
   • 5Undo both bolts on the alternator with a socket wrench until you can remove the bolts completely and take the alternator out of the bracket, removing it entirely from the engine compartment.
     
   • 6Position the new alternator in the bracket and slide the bolts back into place, tightening the bolts with a socket wrench until you can just barely slide the alternator on the bracket.
     
   • 7Place the alternator belt around the alternator pulley and check the position of the belt around both the crankshaft and alternator pulleys to verify that it is seated properly.
     
   • 8Place a crow bar between the alternator and engine block and pull back on the alternator with the bar to add tension to the belt.
     
   • 9Tighten the bolts on the alternator with a socket wrench while you keep the tension on the alternator belt.
     
   • 10Reattach the electrical wire connector to the alternator terminal by placing the connector and the nut on the terminal and securing with a socket wrench.
     
   • 11Connect the negative battery cable to the battery of the Pontiac Montana with an open end wrench.
     

crankshaft position sensor location for 3.3 V6 engine is mounted at the rear of the engine on transmission bellhousing, the 3.5 V6 engine crankshaft sensor located at front of the engine on the aluminum oil pan section below crankshaft pulley.replace the crankshaft position sensor remove heat shield disconnect the electrical connector the remove sensor retaining bolt then remove crankshaft sensor.after replacing crankshaft sensor you need to erase code if check light come back on.

Hi.

Depending on the engine it is located either at the side of the engine block or behind the front pulley. Below both diagrams:

Go to Autozone and they will check your cars trouble codes for free and tell you what part you will need to replace. They are usually right 99% of the time.The crankshaft position sensor located behind the harmonic balancer maybe be bad. There is another crankshaft position sensor located on the engine block above and to the right of the oil filter. Or it could be the power train control module located to the right of the air cleaner box. This information is for the V6 3.4 engine. Buy the repair manual for your Montana and go to the engine performance section. The manual costs about $26.00

A Crankshaft is what the pistons are connected to which is located deep inside the engine.