Thread: td5 not alive

Originally Posted by QLDMIKE

I had this problem at the start of the year. Engine would crank over but would not start.
Had fuel pressure, had air, crank angle sensor worked and injectors were firing.

In the end it took testbook. I had to get test book to have a chat to my computer, once it did it started fine and ran. No problems since

So what was the problem that Testbook fixed?

changed the starter, havent been able to get someone to try and push start the td5 yet, its in a bad position to get moved, the nanocom was able to send voltage to test the injectors they all seem fine, the engine speed is 0 when cranking? i tried testing the cps after i cleanned it, i was able to get a safety pin into the plug at the ecu to see if there was any voltage when cranking the engine but no joy. does that mean its the cps or is there a better way to test.

engine speed 0 when cranking identifies a faulty crank angle sensor.

the initial diagnostic check only makes sure that the thing is electrically present not that its capable of doing its job.

if you get the "crank angle sensor noisy" fault thats usually an indicator of starter motor bushes on the way out.

just checking the RAVE's now

ok the CKP is a signal generator and not a modulator. (crankshaft Speed/Position sensor)

it produces the voltages that the ECU reads. so there will be no voltage present with the engine stationary

Originally Posted by the Rave, more or less

Both pins of the CKP sensor are outputs, to protect the signal the cable has an earth shield.

the ECM measures a positive single on the pink black wire and a negative on the white/blue.


Voltage generation from the ckp is relative to engine speed. A good CKP produces 2-3 volts while cranking and 6-6/5V at 1Krpm+

The airgap of the CKP to the reluctor ring will adjust the voltage.

The signal can be incorrect if one or more of the following occour.

sensor assembly loose
incorrect spacer
sensor Open circuit
sensort short circuit
incorrectly fitted
water ingression

There is no backup strategy for the CKP.

thank you thank you thank you, its going, i am going to have to invest in a pressure gauge for the fuel, all the electrical seems to be fine except the mass airflow is 0.00 on the nanocom , have to check the wires incase i damaged them.

the problem........ i had read about the one way valve in the filter housing near the rear wheel, for some reason the pressure was not enough getting to the engine, when i took the pipe off at the engine there seemed to be good pressure. guess not, i replaced the filter housing with a spare i had and off she went.
thank you all for taking the time to reply and give ideas.