99 FG Starts, runs rough, won't rev up
- Thread starter kerry
- Start date
soaringpotato
New member
Sorry, stressful day at work. I'm not saying what you're saying is wrong. I'm saying a picture of the actual item in question will show a very slight nuance that may have been overlooked by the customer.
I looked closely at the pump I initially posted and at mine. The electrical and fuel connections are all the same. There are three--one on the front of the pump to a sensor--perhaps to monitor timing, one on the front at the top, I have no clue what that does and one on the top at the back. I believe that top back one must operate an internal solenoid and also it must have more controls associated with that connection since it has more wires. The truck is drive by wire, not mechanical so something is controlling the fuel delivery electrically. Right now I'm thinking the problem is associated with the 5.6 volts detectable at the 3 wire connection. I think low voltage is hindering the operation of the fuel on/off solenoid.
After watching those videos I learned a ton. It is not a simple on/off solenoid. It's a 'variable solenoid' (that's not the proper name I am sure) so my 5.36 volts could easily be correct. The accelerator pedal has a rheostat which feeds variable voltage to that actuator/variable solenoid. The ignition key must provide an initial fixed voltage to open the fuel flow and then the variable voltage controls the actuator which in turn controls the fuel rack. edit--I think the proper name is linear motor or linear actuator
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Well, if it turns out the governor or pump is bad and needs to be replaced, I've found a place that rebuilds the Zexel TICS REDIII pumps on the 1999-04 Fuso. https://dwdiesel.com/c/EngineComponents-FuelSystem-InjectionPumps/p/1000434
Key on video
youtube.com
Starting attempt
youtube.com
Videos of the electronic governor with the back cover removed. First video is of the key being turned on. The actuator jumps up to the top and then immediately returns to the bottom. Second video is a starting attempt. The actuator remains at the bottom despite the fact that I am activating the accelerator pedal. I'm assuming that bottom position turns off the fuel as is where it sits with the key off, functioning as a fuel shut off solenoid. I presume once the key is on, it should rise up a little bit to allow fuel to flow to start and idle. I'm not certain of any of this but my initial hypothesis that a fuel shut off solenoid wasn't opening fully (at the time I didn't realize the truck doesn't have a traditional fuel shut off solenoid) seems to be correct. That electronic fuel actuator is not moving when it should be. I presume that could be caused by failures in the electronic governor itself, in a sensor, or even in the ECM or wiring. I did check the connections immediately adjacent to the electronic governor and they were pristine.
Aussie Iron
Explorer
I,ll chime in here. But I will tell you, I have no real experience with this engine and pump only hear say knowledge. If this is the same pump as on our Fg649 Canters and numerous industrial uses (mini excavators and bobcats). Then apparently inside the pump there is a small PC board that sits in the diesel fuel and is not affect by the diesel. It is though affected by water (moister) in the fuel (the moister is attracted to the copper on the PC board ) and causes corrosion. Probably more on machines that do a fair bit of sitting around.
An Fg649 that I looked at buying a while back suffered from this problem and the pump was away for repair and they didn't have a time line for getting the pump repaired (by the diesel service). The part was to be supplied by Bosch.
Probably not much help,
Dan.
An Fg649 that I looked at buying a while back suffered from this problem and the pump was away for repair and they didn't have a time line for getting the pump repaired (by the diesel service). The part was to be supplied by Bosch.
Probably not much help,
Dan.
Thanks for the input. I've concluded the problem is internal to the pump. My shop manual does not list a code 22 for some reason but someone on the Mitsubishi Canter Facebook page screenshot a list of trouble codes this morning and 22 is the rack position sensor. I'm going to contact the local (former?) Fuso dealer and see if they can perform a pump transplant. They also likely still have the software to do a scan of the codes instead of relying on the flash code. I have found a local rebuilder who doesn't have the pump in stock but says he can get one. The pump is a 107492-2162 which the rebuilder says has been superseded with the 107492-2164 pump.