Engine cranks but does not start and limp mode?

Thank you for your prompt reply. I have not yet investigated the possibility of the accelerator pedal position sensor being an issue but will investigate, although it has not come up on the car faults (recent scan). Perhaps it's also worth attempting to use a starting fluid, which I have not tried - where do we spray this, by the way? I haven't used this method before. Lastly, I'll try to bleed any air bubbles from the fuel system this week, to isolate it.

Here are all the fault codes presented by the car. It does seem that no engine faults were picked up, including injectors. But I'm not so certain if new faults would emerge after the car had started.

OBDeleven vehicle history log

Date: 2023-10-01 02:48

VIN:
Car: Audi A3
Year: 2002.2008
Body type: Hatchback
Engine: BKD 103 kW (140 HP) 2.0 l
Mileage: 287210 KM

Fault
Control unit: 01 Engine
Active faults: 0
Inactive faults: 0
System description: R4 2, 0L EDC G000SG
Software number: 03G906016G
Software version: 9884
Hardware number: 0281011364
Serial number: XXXXXXXXXXXXXX
Faults:
No trouble codes found

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 03 Brakes
Active faults: 1
Inactive faults: 0
System description: ESP FRONT MK60
Software number: 1K0907379K
Software version: 0103
Faults:
00778 - Steering angle sensor Faulty
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 08 Air Conditioning
Active faults: 2
Inactive faults: 0
System description: KlimavollautomatH12
Software number: 8P0820043D
Software version: 0150
Hardware number: 8P0820043D
Hardware version: 000
Serial number: 8P0820043D
Faults:
01317 - Instrument cluster control module Please read DTC
static
01206 - Signal for duration of -Ignition OFF- Implausible signal
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 09 Central Electrics
Active faults: 2
Inactive faults: 0
System description: Bordnetz-SG 1.0 H29
Software number: 8P0907279A
Software version: 0501
Hardware number: 8P0907279A *
Hardware version: 063
Serial number: 00000000328030
Faults:
00906 - Signal horn/dual tone horn Open circuit/short circuit to ground
static
01504 - License plate lamp Electrical error in circuit
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 15 Airbag
Active faults: 2
Inactive faults: 0
System description: Airbag 8.4EDmin H01
Software number: 8P0959655G
Software version: 0130
Hardware number: 8P0959655G
Faults:
00655 - Belt tensioner igniter (frt. Pass. Side) Lower limit not reached
static
00588 - Driver side airbag igniter Upper limit exceeded
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 16 Steering Column
Active faults: 1
Inactive faults: 0
System description: Lenksà ulenmodul H11
Software number: 8P0953549
Software version: 0020
Hardware number: 8P0953549 *
Faults:
00888 - Windshield wiper intermittent mode switch Faulty
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 17 Dashboard
Active faults: 1
Inactive faults: 0
System description: KOMBIINSTR. VDO H25
Software number: 8P0920930F
Software version: 0110
Hardware number: 8P0920930F
Serial number: 224NCD07023497
Faults:
00779 - Outside temperature sensor Open circuit/short circuit to B+
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 19 Gateway
Active faults: 0
Inactive faults: 0
System description: Gateway H08
Software number: 1K0907530B
Software version: 0090
Hardware number: 1K0907951
Serial number: 2400103916649E
Faults:
No trouble codes found

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 25 Immobilizer
Active faults: 0
Inactive faults: 0
System description: KOMBIINSTR. VDO H25
Software number: 8P0920930F
Software version: 0110
Hardware number: 8P0920930F
Serial number: AUX7Z0CNFN50M7
Faults:
No trouble codes found

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 44 Steering Assistance
Active faults: 2
Inactive faults: 0
System description: EPS_ZFLS Kl.9
Software number: 1K2909144E
Software version: 1202
Faults:
00778 - Steering angle sensor Please read DTC
static
02441 - Yellow malfunction lamp in instrument cluster Please read DTC
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Fault
Control unit: 46 Comfort System
Active faults: 6
Inactive faults: 0
System description: KSG H02
Software number: 8P0959433
Software version: 0040
Faults:
01135 - Interior monitoring sensors No signal/communication
static
00323 - Vehicle inclination sensor No signal/communication
static
01134 - Alarm horn No signal/communication
static
00926 - Terminal 30 Open circuit
static
00080 - Sliding roof function request Short circuit to ground
static
01403 - Rear glass breakage sensors Open circuit
static

Mileage: 287210 km
Date: 2023-09-30 20:07

Thanks Ken.

This really points me to a clear direction:

1. I will clear these codes and see what faults are stored and perhaps do two reruns to make sure

2. On your cluster shorting out, ill remove it and inspect it tomorrow. Perhaps look at the wiring as well

3. It's a weekend and so my Saturday morning would be to also check all the fuses and relays.

Thanks for the fuse, which I will follow straight away. I will give you feedback in due course.

Hi Ken, quick feedback. I have inspected all the fuses; they seem fine after testing them with a multimeter. Although I have noted that there are some fuses missing - especially near the steering column. The horn relay is missing; the fuse amp 40 in the engine bay was incorrectly placed on F51 slot, instead of F52 which, according to the diagram, is the secondary air pump (SAI) so this was fixed and placed at F52. Removed the ECO and inspected the wiring for corrosion the back connectors are completely clean without signs of water damage or corrosion. I wouldn't be sure about the internals though, but the wiring to and on the pin connectors seem completely unravaged.

Removed and inspected the instrument cluster, all cables seem fine without any shorting, completely clean and no corrosion.

After removing the cover below the steering wheel, I noticed some cut wires that are leading to the fuse box and I'm not sure whether these came with the car like these, or they were meant to lead somewhere. (I have attached picture). Also inspected the steering angle sensor and one wire was slightly cut, it seems and reconnected not sure why. I have tightened the sensor to make sure it's not loose.

I haven't attempted to start the car because I'm still waiting for the new thermostat and housing, replacement of missing fuses and horn relay.

Lastly, I have noticed now after reconnecting the ECU, when ignition is switched on, the cooling fan begins to run I wonder what this means.

Thanks Ken, I reattached both pictures. Perhaps you might have an idea about where these should be leading?

I will check and give you feedback. Generally, I'll give you feedback once all fuses and the crank sensor switch have been replaced and all the codes cleared. Thanks for your quick assistance.

Hello,

Ken, thanks for your inputs. I do have an update

Quick update:

Found that the cable to the camshaft position sensor (connector) was corroded- fixed

primed enough fuel and removed bubbles and car started. The result is that its idling rough, more like misfiring. I have cleared all the errors, but the camshaft fault seems coming back.

Another worrying factor is that when analyzing live data from obdeleven, on the 'Injector Status' channel, it seems as if the only responsive injector/cylinder when revving the car is Cylinder 2. The other three don't present any values at all. Please also note that the 'three' PD injectors installed have not been coded/adapted - not sure if this is the issue. But here's an attachment of the screenshot of the channel.

Any ideas would be greatly appreciated.

Thanks Ken, will revert with all the results on the above. Tons of appreciation.

Ken, here once again. I have just discovered that the above screenshot of the obdeleven on the Injector Status with the value 16 has to do with a faulty injector on cylinder 2. What do you think? I will have to then replace it and get some values on the injector quantity deviation to see how much they spray.

I have run the injector idle test and still running rough though. As promised, I have attached the screenshot of the injector idle values. Please let me know your thoughts on the values. I could suspect cylinders 2 and 3 but I could be wrong.