Where are the sensors located on a jeep?
I’ve done some research and found wiring diagrams on this and other forums (many thanks) and am aware that all 4 sensors meet up at splice S146 which is apparently behind the right side of the engine and follow BK/LG wire through connector C104 (next to the fuse block) and then to ground G101 (inner quarter panel next to fuse block).
Why does my Jeep Grand Cherokee crank no start?
That you have 5V at the crank sensor, shows that there is no short in one of the sensors. The 4.0 has a common problem with shorting wire where it runs around the cylinder head, but i never heard of a buzzing ASD relay in such a case.
Can a bad crank sensor damage the PCM?
Never heard that a bad crank sensor will damage the PCM, but who knows.The ASD relay is switched via the PCM, so if it buzzes, it should be the PCM which is causing this. I would check all grounds and remove/clean/dry/re-install the connectors from the PCM. Disconnect the negative battery lead before messing with the PCM.
What kind of crank sensor does a Jeep Grand Cherokee have?
Crank Sensor Circuit Descriptions 1994-1996 4.0L Grand Cherokee Terminal Color Description 1 RED/LT GRN Crank Signal 2 BLK/LT BLU Ground 3 WHT/BLK 8 Volts ( 1994-1995) 5 Volts ( 1996 )
That you have 5V at the crank sensor, shows that there is no short in one of the sensors. The 4.0 has a common problem with shorting wire where it runs around the cylinder head, but i never heard of a buzzing ASD relay in such a case.
How to fix a jeep computer control unit?
Be careful not to damage any of the components on the board or the copper traces that connect them. When you have resoldered every pad, let the board cool, and treat the connector socket with the Deoxit… make sure yiu get it into the holes in the connector, and carefully treat the pins in the other half of the PCM where this connecter plugs into.
What to do if your Jeep PCM is not working?
As an experienced Electronics Engineer, I have gone the extra step and added the use of a deoxidizer on the connectors, which will protect the connections as well as increase their electrical integrity. I have personally used this cure myself on several Jeeps having been a longtime Jeeper with myfirst being a 76 Cherokee S.