check guages? cause??
01-10-2017 | 06:40 PM
#16
Senior Member
Joined: Jan 2017
Posts: 799
Likes: 4
From: usa
Year: 2000
Model: Cherokee
Engine: 6 cylinder
CCKen wrote:
All the gauges in the cluster are fed by the CPU via the bus. Learn something new everyday. Thanks for that explanation.
Whats still puzzling is why all the connector contacts then? Must be the idiot lights, turn signal lights, etc. have got to be hard wired to their source switches and/or sensors.
The alternator voltage regulation function is in the PCM. The PCM sees the resultant voltage output of the alternator (and battery when the engine is not running). The PCM puts the voltage data on the CCD Bus. The instrument cluster pics up this CCD Bus data and converts it to linear voltage signals to drive the electromechanical voltmeter needle. The CCD Bus connection to the instrument cluster goes through two pins at the cluster. If one or more of these pins/bus data were corrupted all gauges would be affected.
Whats still puzzling is why all the connector contacts then? Must be the idiot lights, turn signal lights, etc. have got to be hard wired to their source switches and/or sensors.
01-12-2017 | 11:15 AM
#18
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 90
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
CCKen wrote:
All the gauges in the cluster are fed by the CPU via the bus. Learn something new everyday. Thanks for that explanation.
Whats still puzzling is why all the connector contacts then? Must be the idiot lights, turn signal lights, etc. have got to be hard wired to their source switches and/or sensors.
All the gauges in the cluster are fed by the CPU via the bus. Learn something new everyday. Thanks for that explanation.
Whats still puzzling is why all the connector contacts then? Must be the idiot lights, turn signal lights, etc. have got to be hard wired to their source switches and/or sensors.
Here's the pin outs of the two instrument cluster connectors. You can see which hard wired cluster advisory lamps circuits go to the cluster.
.
01-14-2017 | 08:33 PM
#20
Thread Starter
Banned
Joined: Oct 2016
Posts: 1,553
Likes: 4
Year: 2000 and 1998
Model: Cherokee
Engine: 4.0
so my oil read 80 pounds, then went back to normal ,its the sender or wiring to the computer? i dont believe it actually went to 80!
