Sub tank not transferring ZD30 CRD Patrol

[MudRunnerTD]

I would also disconnect the battery for 30 minutes to clear Code Errors. I have had to do this a couple of time in my guiv

[Rumcajs]

Thanks guys I'll give it a go again but yeah the light on the button does not come on when it's pushed in.

The switch is just a momentary (monostable) OFF/ON switch which grounds signal to subtank control unit, the light in the switch is activated by the said control unit which grounds it when everything works, power to the light is coming from ignition via fuse 28.

Subtank control unit is powered via 3 fuses, fuse 24 (BATT) fuse 27 (ACC) and fuse 6 (IGN ON). Control unit gets the signals from both tank senders and evaluates the signals levels to acertain the amount of fuel in both tanks. Main tank sender also contains "tank full switch" which is in parallel with main tank level signal to the subtank control unit to indicate it as full.

If the levels are correct (subtank above "empty" and main tank bellow "full") subtank control unit powers up the pump.

If the unit detects a problem the warning lamp gets activated.

There are 13 pins on the subtank control unit (late revision) and when connected the following applies:

1. Ignition switch ON (~12V)
2. pump output (sub tank not empty, main tank not full, subtank switch activated 12V)
3. Ignition switch ACC or ON (~12V)
4. ground (constant) (0V)
5. sub tank level gauge (ignition ON, 0-4V)
6. main tank level NOT full (ignition ON 5V)
7. main tank fuel gauge (igniton ON 0-2.5V)
8. engine status (running ~12V)
9. sub tank fuel switch (ignition ON switch OFF ~5V)
10. sub tank fuel switch indicator (ignition ON switch OFF ~12V)
11. ground (contant) (0V)
12. batt (constant) (~12V)
13. sub tank fuel warning lamp (ignition ON, engine not running, no system fault 0V)

If you have access to multimeter you can easily check the system functions

Regards

[Yendor]

Ok thanks guys, I'll see how it goes but the light does not come on the button either. I'll keep you posted

Does the switch light up when you turn your headlights on like the rest of the dash switches?

If it doesn't check that the switch has been plugged in. Someone may have had it out and forgot to plug the switch back in.

[MudRunnerTD]

Does the switch light up when you turn your headlights on like the rest of the dash switches?

If it doesn't check that the switch has been plugged in. Someone may have had it out and forgot to plug the switch back in.

Haha!! Wouldn't that just sh1t ya to tears!!

[BigRAWesty]

Haha!! Wouldn't that just sh1t ya to tears!!

I seem to remeber a similar issue with some ones antenna not long ago.
I to thought mine was stuffed untill I remeber I have pulled mine apart and have probably forgotten to connect it again.

[Yendor]

Yes the KISS principle lol

[Deeno]

Sorry to dig up an old thread, I'm new to the forum and have spent hours tinkering and searching and cannot find the sub tank issue. I have run an extra earth strap and changed the module, i checked the switch with a multimeter and seems to work when pressed in (being momentary switch i think this is correct). There is no light on the cluster and I've checked the globe and the globe was fine. The switch does not light up at all not when pressed in and not when headlights are on. Ive felt the pump and it always feels cold. Any ideas?

[Deeno]

So i finally managed to get the switch to spit me out a code. 2 long flashes then 4 quick ones, I've tried to interpret them according to the fault code readet but makes no sense. Anyone know what it might be or how to interpret the fault code paper?

[Maxhead]

So i finally managed to get the switch to spit me out a code. 2 long flashes then 4 quick ones, I've tried to interpret them according to the fault code readet but makes no sense. Anyone know what it might be or how to interpret the fault code paper?

Not sure on the code mate, I fixed mine a while back by disconnecting the battery for a while.
It was 2012 CRD.


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[Deeno]

Thanks for the reply mate I've tried that a few times with no luck except for 1 time but hasn't worked since.