Understood. I’ll try to get it apart todaySorry, should have been clearer. I meant the head of the bypass valve. It's mounted on to the housing with 4 bolts from what I can see.
That's exactly what I was thinking. So could moisture in an electrical connection, or oil.If you have a chafe in the harness somewhere between J2 and the switch that is maybe rubbing where it passes through a P-clip or has rubbed through on the transmission case that would give a short circuit to ground and trick the ECM into thinking that the filter was plugged.
124FAlso, just out of curiosity, at what transmission oil temperature does that event become active?
Pulled the connector and the alarm stayed on. Wish I thought of that before.If the alarm does not stop you have a wiring harness or ECM fault
You’re not the only one…..Wish I thought of that before.
Thinking one step further than this you could just pull the applicable wire out of the ECM. See if it stays on. At this stage I'd be cycling the isolator between troubleshooting steps. Not sure why, just a feeling.IIRC the wires pass through a number of harness connectors between the one next to the switch and the ECM. It might pay you to find and open every connector then test the wire in sections.
Checked everything in sections and it all checked out. What else could there be to check? ECM?t might pay you to find and open every connector then test the wire in sections
There isn’t a “hot wire” per se. The ECM “looks” for ground on the wire to the switch. As you know the other wire from the switch is connected to ground, so if the ECM detects continuity to ground from Pin # whatever-it-is, and at the same time the transmission oil temperature is above 51DegC the alarm should sound.I'm assuming the hot wire shouldn't be grounded.
And if that doesn't reveal the fault do the same thing at the ECMTry installing a jumper wire between Pins 1 & 2 of the machine harness connector for the plugged filter switch. Does the alarm stay off or come on.?