Scooby - 'Check Engine ' warning light

[S47]

Help!!
The 'Check Engine' red warning light has been coming on intermitently on my '96 - 2.0Litre Legacy Est, for a coupla weeks
I've changed :-
Oil & filter
Air Filter
Fuel Filter
Plugs & Leads
Alternator Belt has correct tension
and still the light comes on.
There are no fuel/oil/or Water leaks, & I've run out of ideas as to the cause
Anyone else experienced this, and how did you cure it [without removing the warning light bulb]
>
Apart from the 'Check engine' warning light the car runs nicely

[markCSC]

You need to read the code and find out what is causing the CEL

I'm guessing the following would work for a legacy

http://www.scoobypedia.co.uk/index.php/Knowledge/R...

http://www.scoobypedia.co.uk/index.php/Knowledge/S...

[S47]

Maybe a dumb Q - but how, where, & what equipment do I read the codes?

[FlatPack]

The links above tell you

Under the steering column on the centre console side there are a pair of black connectors. Connect them together and then turn the ignition to on (don't actually start the car).

The check engine light will start flashing, a number of long flashes followed by a number of short ones. Long flashes are 10s, short flashes are 1s. So for example if you get 2 long flashes followed by 2 short ones that's code 22 (knock sensor failure), which is what my car is showing at the moment

It'll display all the stored codes and then loop round to the first one again.

Remember to undo the connectors again when you're done

[S47]

Flatpack
Many thanks for the great reply.
I couldn't access the links posted by the first replier, because I only have a dialup INet connection.
I'll try the method you suggest, and post up the results.
once again many thanks
Mal

[markCSC]

Ah I guess mid wales doesn't have broadband yet.

These are some of the codes you might get

1 Engine Speed Signal Circuit
11 Crankshaft Position Sensor
12 Starter Signal
13 Camshaft Position Sensor
14 Fuel Injector No. 1 (Legacy, Impreza, Justy, SVX)
15 Fuel Injector No. 2 (Legacy, Impreza, Justy, SVX)
16 Fuel Injector No. 3 (Legacy, Impreza, Justy, SVX)
17 Fuel Injector No. 4 (Legacy, Impreza, SVX)
18 Fuel Injector No. 5 (SVX)
19 Fuel Injector No. 6 (SVX)
21 Engine Coolant Temperature Sensor
22 Knock Sensor
23 Mass Air Flow Sensor Circuit
24 Idle Control System Malfunction
24 ISC Valve (Stick)
24 Open/Short in ISC Valve Circuit
26 Intake Air Temperature Sensor
27 ATF Temperature Sensor Circuit
28 Knock Sensor #2
29 Crankshaft Position Sensor 2
31 Throttle Position Sensor Circuit
32 A/F Sensor #1 System
32 A/F Sensor #2 System
32 Oxygen Sensor
33 Vehicle Speed Sensor
35 CPC System
36 Turbine Speed Signal
37 Rear O2 Sensor Circuit / A/F Sensor Circuit Malfunction
38 Torque Control Signal #1
38 Torque Control Signal #2
38 Torque Control Signal System
38 Torque Permission Signal
39 Traction Control System
41 Air/Fuel Adaptive Control
42 Idle Switch
43 Accelerator Pedal Switch
44 Turbocharging Pressure Control Signal
45 Pressure Sensor
46 Neutral or Parking Switch or Circuit
47 Fuel Injector
48 Lean Burn System
49 CO Resistor
51 Neutral Position Switch
52 Parking Brake Switch (Exc. Justy)
53 Antenna
53 Anti-Quick Operation Mode
53 Communication Error (Time Over)
53 EGI Control Module EEPROM
53 IMM Circuit Failure (Except Antenna Circuit)
53 IMM Control Module EEPROM
53 Key Communication Failure
53 Reference Code Incompatibility
53 Use of Unregistered Key
54 Air Intake System
55 EGR Valve Lift Sensor
56 EGR System
57 Canister Control System
58 Air Control System
61 Air Suction Control Solenoid Valve
62 Exhaust Manifold Valve Negative Pressure Control Solenoid
64 Relief Valve Control Solenoid Valve 1
64 Relief Valve Control Solenoid Valve 2
65 Differential Pressure Sensor
66 Twin Turbocharger System(H)
66 Twin Turbocharger System(S)
66 Twin Turbocharger System(T)
66 Two Stage Twin Turbocharger System
67 Exhaust Manifold Valve Positive Pressure Control Solenoid
68 Turbocharging Pressure Control Output Signal #2
71 Shift Solenoid Valve
72 Shift Solenoid #2 Circuit
73 Low Clutch Timing Solenoid Circuit
74 Brake Clutch Timing Solenoid Circuit Malfunction
75 Line Pressure Duty Solenoid Circuit
76 Brake Clutch Pressure Duty Solenoid Circuit Malfunction
77 Lock-Up Duty Solenoid Circuit
78 Tiptronic Solenoid System
79 Transfer Clutch Duty Solenoid Circuit
81 Torque Up Control Valve
85 Charger System Circuit Malfunction
86 CAN (Communication System)
87 Variable Induction Solenoid Valve Circuit Malfunction
88 Fuel Pump Circuit Malfunction
89 VVT Systems (L)
89 VVT Systems ®
91 TCS Relief Valve
92 Electrical Generation Control Signal Circuit Malfunction
93 Vehicle Speed Sensor #1 Circuit
94 Lateral G Sensor Signal Circuit Malfunction

[rb5230]

mine just did the 22 code for knock sensor, at subaru main dealer they wanted £105, i got it from http://www.importcarparts.co.uk/

and it is a genuine subaru part the same as from a main dealer but £55. excellent.

[S47]

Hey guys
Mid Wlaes it is
What Have I got myself into;)
AFAICS
here's the codes I'm getting:-
5-3
1-2
2-2
the long and short flashes are veryy quick so I might be 1 out
Thanks for posting up the code meanings but what/where is a knock sensor?
there are several possibilites for 5-3 does 5-3 in combination with eother of the others mean anything?
Ta
Mal

[otolith]

We've had an intermittent CEL on the Impreza since we got it. Still keeps going and passing MOTs, so whatever it is doesn't seem to be doing much harm!

[CaptainSlow]

Yeah mine keeps coming on. I think it is the knock sensor. I will replace it one day, what is the torque setting when doing it?

[rb5230]

CaptainSlow said:

Yeah mine keeps coming on. I think it is the knock sensor. I will replace it one day, what is the torque setting when doing it?

just use the setting "reasonably tight"

[markCSC]

S47 said:

Thanks for posting up the code meanings but what/where is a knock sensor?

God knows what 53 means but it might be linked to the knock sensor. A knock sensor allows the ignition timing to be advanced for more power/economy but prevents pinking/detonation.

Give import car parts a call on 01388 834204. The knock sensor on their site for your car is also £55

Edited by markCSC on Tuesday 2nd November 16:59

[markCSC]

CaptainSlow said:

Yeah mine keeps coming on. I think it is the knock sensor. I will replace it one day, what is the torque setting when doing it?

For you car the manual says 24 N·m (2.4 kgf-m, 17.4 ft-lb)

Have a look here http://www.subaru-car.ru/imp1/imp01_sec1_1.pdf

[CaptainSlow]

thanks

[S47]

Done some more research on this mysterious Knock Sensor [KS] apparently its a piezo electric sensor connected to the ECU - It's possible to check whether the KS is faulty by removing it and measuring the resistance accross the terminals this should be around 560kilo-ohms According to both the Chiltons Legacy workshop manual and the well thought of USA based 'Mitchell on demand System' service schedule.
Interestingly though neither of these list the fault codes mentioned and listed above
KS seems easy to get at so will try this to-morrow, and checking the connections of KS at the same time. Piezo crystal sensors are noted for their reliabilty, so maybe it's simply a bad connection.
Thanks for everyone who's contributed to my post, if anyone knows or can guess at what the 5-3 code means - I'm listening
Ta
Mal

[SClarke]

Correct me if I'm wrong but surely if you have a knock sensor light coming on intermittently it could be that you have actually got detonation occurring? Try running it on V-power (if you don't already) and see if the problem goes away.

[ST170Bird]

Mine was the knock sensor when mine come on (also intermittently), I was away on a course at St Athan at the time and cacked myself that it would knacker the engine if I kept going. Turned out it was a faulty sensor rather than wrong detonation, which is good as I only run it on V-Power.
Hope you get it sorted.

[S47]

Well I give up - My KS ain't where the manual tells me it ought to be
What does the goddam thing look like?? I've been looking under the TB on RH side of engine, only connectors in this area are for the injectors

[markCSC]

I think it is under the intake manifold. Maybe worth asking here http://www.uklegacy.com/forums/

[edit

found a video on youtube

http://www.youtube.com/watch?v=14eS2R2L8aE]

might take you a while on dial up

Edited by markCSC on Wednesday 3rd November 09:16

[rb5230]

it looks like a little doughnut with a lead and connector attached, it will be secured with a single bolt through the ring/hole of the doughnut. it is where the video suggests.