Hello, 2 inquires for help.. 2003 manual 360 recent motor out major service. We cant seem to get power to fuel pumps. Tested the following; Fuses, new key fob battery, inertia switch, battery has a full charge, alarm siren is removed, main ground is connected beside motor mount. Alarm seems to be working ok, locks doors and seems to act correctly. We are fairly confident all connections are correct. Tested the cable connection at fuel pump, no power with key on or while motor is turning over. 2-Where does the bottom hose off the radiator fill/expansion tank connect to? I know it runs forward between intakes, I cant recall where it ends or where it connects? It is the large filer hose. Does anyone have a diagram? Thank you..
It’s hard to imagine an issue which would affect both pumps other than the inertia switch. Have you jumpered the pump relay sockets to see if the pumps run? Can you also use a low wattage test light across the pump relay socket coil pins to see if the respective Motronic relay is providing 12 volts and the respective ECU is providing a ground when the engine is being cranked?
Sorry, getting my cars mixed up. Power for the coil comes from the respective key power relay. You should see power with the key on. The coil grounds still come from their respective ECUs when the engine is being cranked.
How did you test the inertia switch?Did you check voltage at the Motronic ECUs (connectors 1L and 26L, pin 11)? Do you have a Spider or a Modena? If a Modena, checking a plug further upstream might be easier (e.g. backprobe pin 10 on connector 11H/23H (black/green wire) behind the driver's seat) i.e. bottom plug Image Unavailable, Please Login (ignore the red circle)
Short answer-car sat in FL-i bought it to restore/build, we think the guy who had it threw a battery in it after sitting and it jumped a tooth on cam pulley passenger side. Piston bent some valves. We removed engine checked for major damage, had head rebuilt proceeded to do a complete major service. Belts including cam belts, plugs, all fluids, heat exchanger, exhaust variators, water pump etc..Motor is back in and no interference, good oil pressure. trying to sort out the no power to fuel pumps. Car turns over fine and immediately builds good oil pressure. Trying to bring it back to life, 18k mile 03 manual coupe. I have a manual spider same year, both red/tan.
ok-thank you. Modena, ill check later today. Sam recommend a think diagnostic tool that arrived today. We are trying to make sure we have a solid motor so Trev can do a basic tune to it.
I haven't changed one personally. The parts manual shows this: Image Unavailable, Please Login If you were able to remove it, you'd then have to jumper the outer two pins of the connector to bypass it. I think it would be easier just to backprobe the plug behind the LH seat as suggested earlier to see if the inertia switch is producing a voltage (with the key on). There should also be a plug behind the RH seat for the RH bank. I believe you get a ground if the inertia switch has been activated in a crash.
Tested obd with thinkdiag shows left bank fault code 020e1133 Trying to figure out what the code indicates?
1133 = coolant temperature sensor. Let me clarify something. Your said "... Car turns over fine and immediately builds good oil pressure." Turns over without firing ? or turns over and fires up? How do you ascertain good oil pressure if the engine is not running. And if the engine is running, why is it running without fuel pumps?
Motor turns over fine and gauge indicates oil pressure is going up. We tested the connection to fuel pump drivers side, no power. We can’t hear pump running, no power to pump.
Isn't there a tight link between the siren and the immobilizer? Could that be why your fuel pumps aren't being energized?
Siren is one of first things i checked, previous owner had it disconnected when i pulled side cover off to expose it. The car ran before we did all servicing, it did run in past with siren disconnected. The obd tester threw out the code above indicating left and right side motronic system not auctioning properly. Code 020e1133, left bank motronic Bosch engine mgmt system 7.3.1
I don’t think the siren affects immobilisation unless the siren shorts out and blows the Immo fuse. The Immo seems to be happy because the engine is cranking. The start relay on gated cars is hooked up directly to the Immo ECU (at least on genuine gated cars and not (always) conversions). Also, I assume that if you can get fault codes from the Motronic ECUs, that the ECUs are being unlocked by the Immo ECU. At least that’s the way it works on the F355: no unlocking, no communication.
The coolant temperature does affect fuelling. It's included in the ECU calculations. Calculating the Injection Time The injection time tj is given by the sum of the following factors: tj = (t1 + t2 + t3 + t4) x t5 t1 This datum, which is the most important, is a function of the number of revolutions and the engine air intake. t2 The factor t2 depends on the throttle position and the coolant temperature. t3 This last factor corrects the tj according to the battery voltage. As the battery voltage decreases, it is necessary to increase the opening time of the electro-injectors in order to deliver the correct quantity of fuel to the cylinders. t4 depends on the intake temperature. t5 This factor is worth 1 when the system is functioning with an "open loop" while it can be worth from 0.8 to 1.2 when the system is functioning with a closed loop and corrects tj on the basis of the oxygen sensor, in order to bring the air/fuel mix ratio to the stoichiometric value. I doubt it would stop the pumps running, though.
Ok, interesting math..OBD reader indicated-there is one issue detected in the vehicle body system, and a specific fault code listed is related to motronic Bosch engine mgmt system. The way im reading that info is motronic system is ok, it is pushing out one fault code from left bank system. Overall the system seems to be ok if i read it properly. Few pictures of OBD history report atatched. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
One thing i would like to add is currently there are no headers, cats or exhaust on the car, i would assume i should still get fuel pressure without oxygen sensors hooked up etc..We also have to bleed the clutch, when i tried to start it i pushed the clutch pedal in and had my foot on the brake, currently no resistance regarding the clutch but it was pushed in at time of trying to fire it.
Thanks for the additional info. I keep forgetting about that clutch pedal sensor on the manual cars. Neither brake or clutch pedal input is going to affect start or the fuel pump on your car. Regarding the scan... If AI is involved in the diagnostics, I wouldn't be sure what to believe.
Ok, interesting math..OBD reader indicated-there is one issue detected in the vehicle body system, and a specific fault code listed is related to motronic Bosch engine mgmt system. The way im reading that info is motronic system is ok, it is pushing out one fault code from left bank system. Overall the system seems to be ok if i read it properly. Few pictures of OBD histor Thanks trying to give as much info as possible so i dont waste anyone's time.
