Howdy folks, So i'm still trying to track down the slight misfire on idle. When I swap the #5 and #6 pins at the ecu the misfire moves from cylinder 6 to cylinder 5. I have wired up a spare injector connector and i'm going to pull out the number 6 wire from the ECU and wire up my test wire. Hopefully this will tell me once and for all if there is an issue with that wire. What i'm not clear on is where the other wire on the connector should be connected. In the manual it looks to go to a fuseable link. For my testing is it ok for me to connect it to the positive terminal of the battery? Cheers, Simon
That would indicate a problem with the ECU to me. If the problem is between ecu pin and injector, it shouldn't move when you change pins.
Brisz tells the truth. It's pretty common for the ECU to have this problem. It may be able to be fixed - if you're handy with a soldering iron and can remove a FET without damaging the rest of the board. Most people will just replace the ECU though.
Thanks guys The problem is I have tried 3 different ecu and the problem still persists Perhaps it's something to do with the harness connector. Just so it can try some things am I correct in connecting the othe injector wire to the positive terminal?
The injector should have constant power on one side and then be fired when the ecu earths it. If you have verified that you have power at the plug in question I would personally prefer to make ax few changes as possible and just run a single wire back to the ECU.
If you test the wiring circuit with a multimeter you could be able to determine if there is a wiring fault. Looking at the wiring diagram, the WHITE wire with the BLACK tracer is the +12VDC supply. Disconnect the connection plug at the injector. Check the resistance from the injector plug, back to the fusible link. Disconnect the connector at the ECU. Check the resistance of the WHITE wire with the BLUE tracer from the injector plug, back to the ECU, pin #114 [#6 Fuel Injector]. Check the resistance of the fuel injector across the 2 pins. To test the entire circuit, reconnect the plug to the injector & measure the resistance between the fusible link & pin #114 on the ECU connector. Resistance is measured in OHM's. The better quality the meter, the more accurate the results.
Clarification..... The injector connector should have battery voltage on one (1) of the two (2) wires. When the connector is plugged onto the injector, the voltage will flow through this wire, into the injector coil, out the other end & continue down the other wire in the connector, then into the ECU. The CAS 'informs' the ECU when to provide the ground (earth) & the injector will open for a period of milliseconds. 1 millisecond is 1/1000th of a second. The wire making up the coil in the injector is very small in diameter which can burn out (melt) easily if the current (amps) is excessive, just like a fuse. Conducting an OHM's test on an injector will indicate the integrity of the coil, it won't determine if an injector is operating correctly, same deal with a noid light.
All injector power leads are piggybacked..... So if you are concerned about power at No 6, just pop the pin on the W/B wire and run a new wire from the W/B wire on No 4 (all the injectors use a common 12v source)
