My 2001 caravan 3.3 liter went into limp mode. the codes p0500 and p1698 came up i checked the pcm and tcm connections and added electrical grease i need to know where the speed sensor is located the ones i see do not look like the pictures in the parts catalogs
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Re: speed sensor location
Hi my name is Allen!
Both the Input and Output speed sensors or mounted on the side of the trans, they are not to far away from each other, you will see the electrical plug coming out of eack one of them. They are round, biege in color with a black end on it where the connector plugs into. If you don't know which one is bad you will need to replace them both.
I had the exact same problem. Under the battery tray is a ground stud for a wire that branches off from the harness. This is the ground wire for the tcm. loosen it , clean the contact, and re tighten it.
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The transmission is in limp-in mode because of the second DTC - TCM (transmission control module) low voltage. The knock sensor code has nothing to do with that. You need to have the TCM and transmission checked out.
Hi there: This code means that the transmission is slipping in high gear and the TCM (TRansmission Control Mocule) logic thinks it has incorrect ratio since it monitors input and output speed. Keep in mind that TCM uses input from the input speed sensor and output speed sensor to determine gear ratios. The TCM then compares the known gear ratio to the calculated gear ratio for the current range.
Its very possible that the transmission output speed sensor has gone bad. The output speed sensor is what the speedometer reads for vehicle speed. When you open the hood and look straight down at the front of the transmission you will see two sensors that screw into the side of the transmission case that are about the size of a half dollar, the output speed sensor will be the one on the far right side.
The code P1698 is: No CCD messages from TCM. That means the communication between the Transmission Control Module and the Power Control Module is lost. Sometimes this happens when a PCM, or TCM is replaced without being flashed, a bad connection at the PCM, TCM, or a bad TCM. Hope this helps.
How is your transmission shifting? the reason I ask is because your code is a communication loss code between the TCM and the other module(s). It's not uncommon for the wiring problems to develop in the harness that runs from the PCM in front of the battery to the TCM on the Pass side inner fender. Look around where the harness is tie strapped to the transmission pan. it's common for the wires to break or be full of water especially after somebody has had the pan off or the transmission has been removed for repair. Can also be a wiring problem right at the PCM or TCM connector or the TCM itself TCM is transmission control module) although not as likely as a wiring issue. when communication is lost the transmission will go into limp mode which is 2nd gear and stay there. Sometimes it will come back every time the van is shut off. Not an easy fix but on the plus side not an overly expensive one if you're gonna tackle it yourself. You'll need a scanner that will give you input and output speed sensor readings and a wiring diagram. TCM's should be reasonably cheap used or even new, not sure haven't priced one in forever and the wrecking yard are full of them and even the connector(s) should they be required