I'm trying to fault find a 2006 RD9 2.2 Diesel CR-V.
Intermittent crank no start.

When working (i.e. crank and start) ignition is switched on a range of lights illuminate on the dash, including EML and Glow-plug light. After 2 seconds, glow plug and EML go out. Turn key to start, Engine cranks and starts.

When not working (i.e. crank no start) ignition is switched on a range of lights illuminate on the dash excluding EML and Glow-plug light. From this initial position, if I turn key to start, engine will crank but not start.

Turning ignition off and back on again repeatedly (1-25 times) will eventually see the correct EML and glow plug light briefly illuminate and the car will then start.

Code scan shows 1 DTC. P0602 "Control Module Programming Error" but Googling suggests this can be caused by wiring faults.

I've located the ECU (left side footwell). There's no obvious damage/moisture/corrosion.

Thinking the issue might be glow-plug related, I've swapped out the glow-plug relay, located adjacent to the battery. Removing the relay causes the fault condition. i.e. with the relay removed, I get no EML and no glow-plug light on the dash. The replacement relay (ebay Item ID: 196059010011) behaves just the same so unless I've been really unlucky and bought a used relay with the exact same fault as the original, I think the issue lies elsewhere.

I've pulled various relays in the underbonnet fuse box and also those under the dash but all test ok.

Any suggestions for testing/diagnosis gratefully received.

Thanks

 

Whatever font you're using is almost invisible in dark mode.

I'm a USDM guy so no special knowledge with the diesel CRVs, but I would be interested in chasing that trouble code that you've got currently. According to other posts it's pointing to a software issue or hardware issue. Although when searching online, people are discussing fuel rail pressures and draining the water separator. Although I can't see why a WIF fault would prevent you from starting the car? The only instance of the issue fixed was someone reflashing their ECU software. That's probably where I'd want to start.

 

Hi Smackin.

Thanks for your reply. Here in the UK there are ECU testing/repair services available which I have used before. Cost is 335 GBP (422 USD) which represents about 25% of the car's value so I was reluctant to go down that path without first exploring other (cheaper) options. Your reply has nudged me further toward sending the ECU away but I'l wait a little longer and see if anyone has had a similar issue and fixed it.

Apologies for the poor font choice. I've editted my original post so hopefully it's now clearer.

Cheers

 

Testing update.
I temporarily removed the ECU. With the ECU removed, the dashboard lights are the same as when the fault is present. i.e no EML and no glow-plug light.
This leads me to believe the root problem is with the power supply to the ECU.
I rigged a test lamp to 15A fuse 17 in the fusebox near the steering column. I belive this is the fuse for the ECU supply. This fuse is live when the iginition switch is on, with or without the ECU installed. The fuse is not live when the ignition switch is off.

Question:- is the power supply to the ECU (fuse 17) switched via a relay? If yes, where is this relay?

 

Found a thread on another forum which suggests the power supply relay function is built in to the ECU.
I've have sent the ECU to ecutesting.com.

 

£335 well spent. ECU repaired by ecutestingdotcom. Car now starts on the button.