limp mode after transmission swap?
#21
Without having read all DTC-s, your mechanic and/or electrician may be doing unnecessary guesswork. As suggested by "Addicted2boost", get the codes from the ECM and TCM and post them on this forum.
Last edited by M. Stojanovic; 12-15-2023 at 11:12 PM.
The following users liked this post:
ericnunez (12-16-2023)
#22
#23
If I was at work, I’d have access to all those codes. I know they exist on here somewhere. I know the P1121 is a TPS or a PPS code. Not to undermine the P1121, The one that will make the car most unhappy is the C1156. If I’m not mistaken that code is for the right rear wheel speed sensor. The right rear wheel speed sensor is what sends your main vehicle speed to the speedometer. If the IP doesn’t receive this signal, that will be the one to send your vehicle into fail safe mode. I’d ask them to visually inspect the rear wheel speed sensors and if those look ok, swap the right and left rear sensors side to side. Assuming that RT RR sensor is open, it will still have an ABS fault light on but, it should act a little more normal *after* they clear the codes and drive it again. The speedometer should work again and drive better.
The following users liked this post:
ericnunez (12-17-2023)
#24
If I was at work, I’d have access to all those codes. I know they exist on here somewhere. I know the P1121 is a TPS or a PPS code. Not to undermine the P1121, The one that will make the car most unhappy is the C1156. If I’m not mistaken that code is for the right rear wheel speed sensor. The right rear wheel speed sensor is what sends your main vehicle speed to the speedometer. If the IP doesn’t receive this signal, that will be the one to send your vehicle into fail safe mode. I’d ask them to visually inspect the rear wheel speed sensors and if those look ok, swap the right and left rear sensors side to side. Assuming that RT RR sensor is open, it will still have an ABS fault light on but, it should act a little more normal *after* they clear the codes and drive it again. The speedometer should work again and drive better.
#25
From Jaguar DTC Summaries AJ27 Engine Management – 2000 MY (PPS - Pedal Position Sensor):
From Jaguar DTC Summaries 5 HP 24 Transmission Control System – 2000 MY ON:
I do not have the Jaguar document for "C codes". Based on generic listing of codes, C1156 appears to mean "Speed Wheel Sensor LF (Left Front) Circuit Open"
Since you have P1121 (failure at PPS) and P1632 (loss of throttle data), I would first look into the PPS (potentiometer on the Throttle Body) and into its connector.
From Jaguar DTC Summaries 5 HP 24 Transmission Control System – 2000 MY ON:
I do not have the Jaguar document for "C codes". Based on generic listing of codes, C1156 appears to mean "Speed Wheel Sensor LF (Left Front) Circuit Open"
Since you have P1121 (failure at PPS) and P1632 (loss of throttle data), I would first look into the PPS (potentiometer on the Throttle Body) and into its connector.
#27
The following 3 users liked this post by motorcarman:
#28
From Jaguar DTC Summaries AJ27 Engine Management – 2000 MY (PPS - Pedal Position Sensor):
From Jaguar DTC Summaries 5 HP 24 Transmission Control System – 2000 MY ON:
I do not have the Jaguar document for "C codes". Based on generic listing of codes, C1156 appears to mean "Speed Wheel Sensor LF (Left Front) Circuit Open"
Since you have P1121 (failure at PPS) and P1632 (loss of throttle data), I would first look into the PPS (potentiometer on the Throttle Body) and into its connector.
From Jaguar DTC Summaries 5 HP 24 Transmission Control System – 2000 MY ON:
I do not have the Jaguar document for "C codes". Based on generic listing of codes, C1156 appears to mean "Speed Wheel Sensor LF (Left Front) Circuit Open"
Since you have P1121 (failure at PPS) and P1632 (loss of throttle data), I would first look into the PPS (potentiometer on the Throttle Body) and into its connector.
Last edited by ericnunez; 12-17-2023 at 07:59 PM.
#29
You have P1121 (failure of PPS) and P1632 (loss of throttle data). Loss of throttle data (to the ECM and/or TCM) suggests that it is caused by the problem at the Throttle Body (at the PPS). It could either be failure of the PPS (not uncommon) but it could be as simple as a bad contact at the connector to the PPS so I would inspect/clean the connector pins first. The Throttle Body:
The following users liked this post:
ericnunez (12-17-2023)
#30
You have P1121 (failure of PPS) and P1632 (loss of throttle data). Loss of throttle data (to the ECM and/or TCM) suggests that it is caused by the problem at the Throttle Body (at the PPS). It could either be failure of the PPS (not uncommon) but it could be as simple as a bad contact at the connector to the PPS so I would inspect/clean the connector pins first. The Throttle Body:
Last edited by ericnunez; 12-17-2023 at 09:36 PM.
#31
#32
Yeah that would make sense. Will check in with them tomorrow afternoon to see whats up and update them on what to do next. Thanks.
#33
I don't think the PPS can be cleaned/serviced as it is a sealed unit. It is not available as a separate part (not even its knock-offs) so, if you need to replace it, you will have to look for a used one (or a complete used TB if no one is selling the PPS separately).
In addition to checking the connector to the PPS, you may also need to check the continuity of the wires that connect the PPS to the ECM. See the attached pdf document which contains relevant pages from the Jaguar Electrical Guide. On the first four pages, you will find info on what the normal voltages should be on the PPS. The last page is the wiring diagram showing how the PPS connects to the ECM.
In addition to checking the connector to the PPS, you may also need to check the continuity of the wires that connect the PPS to the ECM. See the attached pdf document which contains relevant pages from the Jaguar Electrical Guide. On the first four pages, you will find info on what the normal voltages should be on the PPS. The last page is the wiring diagram showing how the PPS connects to the ECM.
The following 3 users liked this post by M. Stojanovic:
#34
The following 3 users liked this post by M. Stojanovic:
#35
I don't think the PPS can be cleaned/serviced as it is a sealed unit. It is not available as a separate part (not even its knock-offs) so, if you need to replace it, you will have to look for a used one (or a complete used TB if no one is selling the PPS separately).
In addition to checking the connector to the PPS, you may also need to check the continuity of the wires that connect the PPS to the ECM. See the attached pdf document which contains relevant pages from the Jaguar Electrical Guide. On the first four pages, you will find info on what the normal voltages should be on the PPS. The last page is the wiring diagram showing how the PPS connects to the ECM.
In addition to checking the connector to the PPS, you may also need to check the continuity of the wires that connect the PPS to the ECM. See the attached pdf document which contains relevant pages from the Jaguar Electrical Guide. On the first four pages, you will find info on what the normal voltages should be on the PPS. The last page is the wiring diagram showing how the PPS connects to the ECM.
Last edited by ericnunez; 12-18-2023 at 09:38 AM.
#36
It’s also possible that the wires within the connector needs to be pushed in a bit more with a very small flathead screwdriver so there’s a more positive connection. From the backside of the connector, you gently but firmly push in the round seal which forces the female pin to connect better with the male pin of the TPS/PPS.
The following users liked this post:
ericnunez (12-18-2023)
#37
It’s also possible that the wires within the connector needs to be pushed in a bit more with a very small flathead screwdriver so there’s a more positive connection. From the backside of the connector, you gently but firmly push in the round seal which forces the female pin to connect better with the male pin of the TPS/PPS.