Fresh Air Inspector
Member
- Joined
- Nov 4, 2018
- Location
- LaHave, Nova Scotia, Canada
Hello All,
Hopefully someone has dealt with this issue - my searches have not found any words of enlightenment.
After months of delay I finally reached the big day - firing up the transplanted engine only to be greeted with a 'no start'.
Background
The donor is a 05/1994 940 turbo (T) sedan and the recipient; a 02/1994 940 normally aspirated (NA) wagon. The ECU and EZ-K modules have been swapped so these are correct. Both cars were fully functional before I started the engine swap. No wiring changes were made other than moving the battery (new feed to the started motor), moving the MAF from the drivers side to the passenger side and adding the pre-heater to the crankcase ventilation hose.
I've traced the problem down to a fuel injection issue. The Radio Interference Suppression Relay is energizing but Fuse 11 is not providing 12V to the fuel injection relay,the O2 sensor or both fuel pumps. Fuse is OK, meter shows 0V with ignition on, same in start mode.
Analysis
The NA engine circuits use a 4 pin relay for the fuel injection whereas the T engine uses a 6 pin (basically 2 relays in one housing). The NA relay panel does NOT have any electrical connections available for this 6 pin relay. The major issues as I see it are as follows;
ECU - pin 9 connects to;
NA; MAF sensor pin 5
T; Air Preheating – pin 1 + Idle Air Control valve – pin 1 + Fuel Injection Relay – pin 1
ECU - pin 20 connects to;
NA; Fuel Injection Relay pin 4
T; Fuel Injection Relay – pin 2
ECU - pin 21 connects to;
NA; Radio Interference Suppression Relay – pin 1
T; Fuel Injection Relay – pin 4
Hopefully I haven't damaged the ECU trying to start the car.
Does anyone have any ideas or suggestions??? This one has become quite a challenge.
Hopefully someone has dealt with this issue - my searches have not found any words of enlightenment.
After months of delay I finally reached the big day - firing up the transplanted engine only to be greeted with a 'no start'.
Background
The donor is a 05/1994 940 turbo (T) sedan and the recipient; a 02/1994 940 normally aspirated (NA) wagon. The ECU and EZ-K modules have been swapped so these are correct. Both cars were fully functional before I started the engine swap. No wiring changes were made other than moving the battery (new feed to the started motor), moving the MAF from the drivers side to the passenger side and adding the pre-heater to the crankcase ventilation hose.
I've traced the problem down to a fuel injection issue. The Radio Interference Suppression Relay is energizing but Fuse 11 is not providing 12V to the fuel injection relay,the O2 sensor or both fuel pumps. Fuse is OK, meter shows 0V with ignition on, same in start mode.
Analysis
The NA engine circuits use a 4 pin relay for the fuel injection whereas the T engine uses a 6 pin (basically 2 relays in one housing). The NA relay panel does NOT have any electrical connections available for this 6 pin relay. The major issues as I see it are as follows;
ECU - pin 9 connects to;
NA; MAF sensor pin 5
T; Air Preheating – pin 1 + Idle Air Control valve – pin 1 + Fuel Injection Relay – pin 1
ECU - pin 20 connects to;
NA; Fuel Injection Relay pin 4
T; Fuel Injection Relay – pin 2
ECU - pin 21 connects to;
NA; Radio Interference Suppression Relay – pin 1
T; Fuel Injection Relay – pin 4
Hopefully I haven't damaged the ECU trying to start the car.
Does anyone have any ideas or suggestions??? This one has become quite a challenge.
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