Limp mode 2003 Disco
With the XYZ Switch loose position it one way fully, tighten up the 2 10mm bolts, and check the PRND321 reading on the dash and the LED indicator on the shifter. If it's not being displayed properly crawl back under it, loosen the 2 10mm bolts, and move the XYZ Switch in the other direction. That normally is enough adjustment to get the XYZ Switch adjusted.
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Overlanding
Joined: Aug 2017
Posts: 15
Likes: 0
I have a Disco with 168k. Runs in first gear. What do I need to do first to get it running. Codes are: po103, po112, and p1884. I see info on here about neutral safety switch being the culprit of limp mode. Here is a picture of the dash lights. Any help would be greatly appreciated.
With the XYZ Switch loose position it one way fully, tighten up the 2 10mm bolts, and check the PRND321 reading on the dash and the LED indicator on the shifter. If it's not being displayed properly crawl back under it, loosen the 2 10mm bolts, and move the XYZ Switch in the other direction. That normally is enough adjustment to get the XYZ Switch adjusted.
I'm trying remove the neutral safety switch to clean it. I removed the 2 10mm bolts but the one on the arm that looks like it goes into tranny is still holding it on. I remove this also to free up the Neutral Safety switch, right?
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Overlanding
Joined: Aug 2017
Posts: 15
Likes: 0
Here is a picture.
Pro Wrench
Joined: Nov 2015
Posts: 1,935
Likes: 189
From: Coastal Georgia
the one on the arm that looks like it goes into tranny is still holding it on
......
Last edited by number9; Jan 1, 2018 at 08:38 PM.
Camel Trophy
Joined: Dec 2009
Posts: 3,883
Likes: 951
From: Charlotte
Diagnose, diagnose, diagnose.
According to the RAVE there are 15 different faults that can trigger the flashing M&S lights and limp home mode. Only one (P0705) has anything to do with the XYZ switch. You say you have fault code P1884. It is one of the 15. The RAVE says the fault description for P1884 combined with the flashing M&S lights is "* CAN message: Engine speed invalid." The footnote for the asterisk says "*=Emissions (OBD II) relevant." Given that let's look at the other two fault codes.
P0103 - Mass or volume air flow high input (MAF signal > maximum threshold, which is speed dependent)
P0112 - Intake air temperature circuit low input (Intake air temperature signal less than minimum threshold, after time for exhaust to warm up)
According to the RAVE the MAF and intake air temp sensors are combined into a single unit.
Therefore, you have a problem with the MAF/IAT that could be triggering the P1884 trans code, flashing M&S and limp mode. If I were you I'd first check the MAF connector and if that doesn't clear up the problems I'd replace the MAF. When replacing the MAF always ensure you use the genuine Bosch part.
Diagnose, diagnose, diagnose.
According to the RAVE there are 15 different faults that can trigger the flashing M&S lights and limp home mode. Only one (P0705) has anything to do with the XYZ switch. You say you have fault code P1884. It is one of the 15. The RAVE says the fault description for P1884 combined with the flashing M&S lights is "* CAN message: Engine speed invalid." The footnote for the asterisk says "*=Emissions (OBD II) relevant." Given that let's look at the other two fault codes.
P0103 - Mass or volume air flow high input (MAF signal > maximum threshold, which is speed dependent)
P0112 - Intake air temperature circuit low input (Intake air temperature signal less than minimum threshold, after time for exhaust to warm up)
According to the RAVE the MAF and intake air temp sensors are combined into a single unit.
Therefore, you have a problem with the MAF/IAT that could be triggering the P1884 trans code, flashing M&S and limp mode. If I were you I'd first check the MAF connector and if that doesn't clear up the problems I'd replace the MAF. When replacing the MAF always ensure you use the genuine Bosch part.
Diagnose, diagnose, diagnose.
Diagnose, diagnose, diagnose.
According to the RAVE there are 15 different faults that can trigger the flashing M&S lights and limp home mode. Only one (P0705) has anything to do with the XYZ switch. You say you have fault code P1884. It is one of the 15. The RAVE says the fault description for P1884 combined with the flashing M&S lights is "* CAN message: Engine speed invalid." The footnote for the asterisk says "*=Emissions (OBD II) relevant." Given that let's look at the other two fault codes.
P0103 - Mass or volume air flow high input (MAF signal > maximum threshold, which is speed dependent)
P0112 - Intake air temperature circuit low input (Intake air temperature signal less than minimum threshold, after time for exhaust to warm up)
According to the RAVE the MAF and intake air temp sensors are combined into a single unit.
Therefore, you have a problem with the MAF/IAT that could be triggering the P1884 trans code, flashing M&S and limp mode. If I were you I'd first check the MAF connector and if that doesn't clear up the problems I'd replace the MAF. When replacing the MAF always ensure you use the genuine Bosch part.
Diagnose, diagnose, diagnose.
According to the RAVE there are 15 different faults that can trigger the flashing M&S lights and limp home mode. Only one (P0705) has anything to do with the XYZ switch. You say you have fault code P1884. It is one of the 15. The RAVE says the fault description for P1884 combined with the flashing M&S lights is "* CAN message: Engine speed invalid." The footnote for the asterisk says "*=Emissions (OBD II) relevant." Given that let's look at the other two fault codes.
P0103 - Mass or volume air flow high input (MAF signal > maximum threshold, which is speed dependent)
P0112 - Intake air temperature circuit low input (Intake air temperature signal less than minimum threshold, after time for exhaust to warm up)
According to the RAVE the MAF and intake air temp sensors are combined into a single unit.
Therefore, you have a problem with the MAF/IAT that could be triggering the P1884 trans code, flashing M&S and limp mode. If I were you I'd first check the MAF connector and if that doesn't clear up the problems I'd replace the MAF. When replacing the MAF always ensure you use the genuine Bosch part.
Diagnose, diagnose, diagnose.
I’ve had good results with the Delphi MAF.
