Whats that sender on top of back diff?
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Joined: Jan 2007
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From: Gillam, Manitoba, Canada
The connector to the rear diff got ripped off in deep snow a while back. The spedo would read zero until about 20kph, then it would switch to another signal (front wheel sensors?)
There isn't a sensor on the trans that I can find.
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Joined: Jan 2006
Posts: 2,756
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From: McDonough GA
P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH (DIESEL) (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - SCHEMATICS
AND DIAGRAMS)
For a complete wiring diagramRefer to Section 8W
Theory of Operation
² When Monitored:
Continuously with the ignition on, engine running, and gear selector NOT in park or neutral.
² Set Condition:
This DTC will set if the vehicle speed (reported from the CAB module) is above 24 Kmh (15 mph), and the
monitored Output Shaft Speed is below 60 RPM for 2.6 seconds.
ABS MESSAGES NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
² When Monitored:
With the ignition on.
² Set Condition:
The Instrument Cluster does not receive any messages from the ABS (CAB) module for at least 5 seconds.
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - SCHEMATICS
AND DIAGRAMS)
For a complete wiring diagramRefer to Section 8W
Theory of Operation
² When Monitored:
Continuously with the ignition on, engine running, and gear selector NOT in park or neutral.
² Set Condition:
This DTC will set if the vehicle speed (reported from the CAB module) is above 24 Kmh (15 mph), and the
monitored Output Shaft Speed is below 60 RPM for 2.6 seconds.
ABS MESSAGES NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
² When Monitored:
With the ignition on.
² Set Condition:
The Instrument Cluster does not receive any messages from the ABS (CAB) module for at least 5 seconds.
Speedometer readings are driven off the ABS system and have been since MY 1997. The output speed sensor monitors trans output shaft rpm's for control of the OD and other trans functions.
Registered User
Joined: Mar 2005
Posts: 6,259
Likes: 1
From: Utah
your right, I read some more and found this...
The PCM continually monitors the vehicle speed sensor or the Controller Anti-lock Brake (CAB) to determine the vehicle road speed. The PCM then sends the proper vehicle speed messages to the instrument
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JoshPeters
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Apr 3, 2005 08:13 AM