Author Topic: Subaru OBDI Diagnostic Trouble Codes (cel)  (Read 1394 times)

Offline omahasubaru

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Subaru OBDI Diagnostic Trouble Codes (cel)
« on: October 05, 2011, 11:39:43 AM »
In my recent research and sorting out some codes, I figured this resource may be helpful. Although few on here are OBDI, it is still beneficial.

(source : )

How to Read Trouble Codes From the ECU (OBDI)

On the gauge cluster, to the top left there are a few idiot lights which are not on under normal driving conditions.  One of these lights reads 'check engine.'  This light comes on when the ECU detects a fault in one of the many electronic components from which it receives signals and to which it transmits signals.  If the ECU recognizes a problem while the car is on, the 'check engine' light will be constantly illuminated.  If it has detected a problem in the past, but the problem which it detected no longer exists, the light will be out.  However, the ECU will store a record of the faults it has detected in the past until they are cleared deliberately or unintentionally.  To read any current or past faults, the 'check engine' light will flash in a sort of Morse code, which we can decipher.
Underneath the steering column is a wide rectangular piece of plastic, the same color as the dash, which has a tray marked 'TRAY.'  This large piece is held to the underside of the dash with a bunch of screws.  Remove these screws and remove the plastic piece.  Now there will be a bunch of wires for you to see.  To the left of the steering column (at least in left hand drive cars) somewhere probably tucked away will be a bundle of wires with two pairs of electrical connectors which are disconnected.  One is black and connects one wire to one wire, the other is green and roughly 'T' shaped, this one also connects one wire to one wire.  With the car turned completely off, connect the black connector.  Next, turn the ignition to 'ON' but do not start the car.  The idiot lights in the dash will come on, and some may go out after a few moments.  Watch the 'check engine' light and maybe have something you can write on to remember the codes.  If there is a fault code in the ECU, the 'check engine' light will begin to flash in a particular manner.  The codes range in number from 11 to 52, so we know that they all will be two digits.  To signify the tens place of the number, the 'check engine' light will flash a long (1.2 seconds) flash.  The single digit will be a short (.2 seconds) flash.  Each flash within the same code will be separated by .3 seconds.  Each error code will be separated by 1.8 seconds.  Don't bother trying to time all these, just watch the light and you will begin to understand.  Once the ECU has flashed all stored codes, it will loop through and repeat them.  Now, for example, you see two long flashes followed by two short flashes.  This means you have a code number 22.  By looking at the following chart, we see that 22 is the code for the knock sensor.  Once you have read and recorded all faults, turn the ignition off and disconnect the black connector.

If you have done the above procedure, you will likely wonder what the green T-shaped connectors are for.  These are for a more active code reading procedure called D-check mode in the Subaru manuals.  Start with both connectors disconnected, start the engine, allow it to warm up, then turn it off.  Next, connect the test mode connectors (green T-shape).  Turn ignition to ON position without turning on engine.  At this point if the check engine light does not come on, it is faulty and must be fixed before continuing.  Depress accelerator pedal to floor, return to half throttle and hold for two seconds, then release.  Start the engine.  Now the light can blink in two different ways.  If everything checks out so far, it will blink to indicate a number 01, 02, 03, 04, 05, 06, 07, or 08.  If a problem is already detected, it will blink according to the chart below.  Either way, your next step will be to drive the car with the test mode connectors connected.  You must drive over 7 mph for at least one minute, and shift up to 4th gear if you have a manual tranny.  Now, either you will discover your trouble codes, or you will have none.

To erase trouble codes from the computer (without resorting to the infamous battery disconnect dance), repeat the above procedure exactly, but connect both the green and black connectors at the appropriate time. 

CodeItemContents of DiagnosisFail-Safe OperationNon- TurboTurbo
11crank angle sensorNo signal entered from crank angle sensor, but signal (corresponding to at least one rotation of the crank) entered from cam angle sensornoneXX
12starter switchAbnormal signal emitted from starter switchTurns starter signal switch OFFXX
13cam angle sensorNo signal entered from cam angle sensor, but signal (corresponding to at least two rotations of cam) entered from crank angle sensornoneXX
14Injector #1Fuel injector inoperative (Abnormal signal emitted from monitor circuit)noneXX
15Injector #2Fuel injector inoperative (Abnormal signal emitted from monitor circuit)noneXX
16Injector #3Fuel injector inoperative (Abnormal signal emitted from monitor circuit)noneXX
17Injector #4Fuel injector inoperative (Abnormal signal emitted from monitor circuit)noneXX
21Water temperature sensorAbnormal signal emitted from water temperature sensorAdjusts water to a specific temperature, maintains radiator fan "ON" to prevent overheatingXX
22Knock sensorAbnormal voltage produced in knock sensor monitor circuitSets in regular fuel map and retards ignition timingXX
23Air flow sensorAbnormal voltage input entered from air flow sensorControls the amount of fuel (injected) in relation to engine speed and throttle sensor positionXX
24Air control valveAir control valve inoperative (Abnormal signal produced in monitor circuit)Prevents abnormal engine speed using "fuel cut" in relation to engine speed, vehicle speed, and throttle sensor positionXX
31Throttle sensorAbnormal voltage input entered from throttle sensorSets throttle sensor's voltage output to a fixed valueXX
32Oxygen sensorOxygen sensor inoperative noneXX
33Vehicle speed sensorAbnormal voltage input entered from vehicle speed sensorSets vehicle speed signal to a fixed valueXX
35Canister purge solenoid valveSolenoid valve inoperativenoneXX
41A/F learning controlFaulty learning control functionnoneXX
42Idle switchAbnormal voltage input entered from idle switchJudges OFF operationXX
44Duty solenoid valve (Wastegate control)Duty solenoid valve inoperativenoneX
45Atmospheric pressure sensorFaulty sensorSets sensor to 760 mmHgX
45Pressure sensor and pressure exchange solenoid valveFaulty sensor or pressure exchange solenoid valve inoperativePrevents abnormal supercharging pressure using "fuel cut" in relation to engine loadX
49Air flow sensorUse of improper air flow sensornoneXX
51Neutral switchAbnormal signal entered from neutral switchnoneXX
51Inhibitor switchAbnormal signal entered from inhibitor switchnoneXX
52Parking switchAbnormal signal entered from parking switchnoneXX