2002 defender cps issue

**mfc** · 5th August 2023, 02:50 PM

Hey all…stranded at home again.
Long story short ,I had a wire from the cps break and fixed it by twitching a scrap of wire in and taping it up……..ran perfectly for 3 months until I fixed it last night/today…….

Won’t start…had a cps fault from the plug….also a no tach drive [there’s none on the car]
I’ve a spare cps and I’ve tried that as well…both have the same ohm reading …

I’ve tried purging the fuel rail

Checked all fuses n relays

Cleaned ecu[was clean already] plugs and engine plug

As far as I see there’s 2 other options

Cut back the cps Leads a bit and solder on a new section,check fuel presure reg wires to as they came off….

It’s a battery/alternator issue…….I had a dead flat[clicking relay flat] and I’m fairly certain I’d left nothing on[98%]….it’s on charge but at 12.7 of the charger…no go..drops to 12.3 after 10 sec’s key
My alternator is low ish on output as well[I’ve a spare]13.2 to 26v …
Battery colapsed?

All sugestions greatly appreciated as it’s 30 km to town
Cheers mark

**Tins** · 5th August 2023, 02:57 PM

Dunno about Deefers, but my TD5 disco won’t start if the battery is even a little low.
As for the CPS wiring, mine has had it cobbled together for about 18 months now. Never seems to be a problem.

**p38arover** · 5th August 2023, 04:31 PM

CPS?

Cycles per second - aka Hz?

**one_iota** · 5th August 2023, 04:45 PM

Originally Posted by p38arover

CPS?

Cycles per second - aka Hz?

It's a TLA

**shack** · 5th August 2023, 05:41 PM

Originally Posted by p38arover

CPS?

Cycles per second - aka Hz?

Crankshaft position sensor.

But I'm guessing you already knew that!

**mfc** · 5th August 2023, 06:09 PM

Originally Posted by Tins

Dunno about Deefers, but my TD5 disco won’t start if the battery is even a little low.
As for the CPS wiring, mine has had it cobbled together for about 18 months now. Never seems to be a problem.

Yea I’m thinking it’s colapsed……I had it on full charge and the voltage on the nanocom dropped from 12.8 to 10.3 in 5 cranks
I’m thinking the ecu needs 11+[11.9 v?]….starter might have been a bit slow.

Batterys off the car to see how it behaves [overnight 4c here] see what the v drops to
Cheers

**discorevy** · 5th August 2023, 07:21 PM

Yes, check the battery for spikes.... I think it's Cactus

**p38arover** · 6th August 2023, 09:13 AM

Originally Posted by shack

Crankshaft position sensor.

But I'm guessing you already knew that!

No, I didn't.

**akelly** · 6th August 2023, 09:57 AM

I had a world of trouble with the CPS wiring on mine after I put in the new engine. Ended up raiding an unused plug that was hiding up beside the brake booster and soldered it in, has been fine since then. I found advice online saying not to solder to the loom but the available space is so short there was really no choice. I keep meaning to go back and shield that section but haven't yet.

If you're getting CPS faults and you know the sensor itself is good (mine was new) then the loom is probably the issue - it's a bad design.

**mfc** · 6th August 2023, 10:46 AM

Originally Posted by akelly

I had a world of trouble with the CPS wiring on mine after I put in the new engine. Ended up raiding an unused plug that was hiding up beside the brake booster and soldered it in, has been fine since then. I found advice online saying not to solder to the loom but the available space is so short there was really no choice. I keep meaning to go back and shield that section but haven't yet.

If you're getting CPS faults and you know the sensor itself is good (mine was new) then the loom is probably the issue - it's a bad design.

Yea there both good[cps] but the plugs crap……..was searching for one to scrounge

I’m betting on dead cells in battery as well ….won’t hold over 10ish volts on nanocom whilst cranking

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