Autodata - Diagnostic Trouble Codes Fault locations and probable causes - 2004 edition

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/Autodata
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VOLKSWAGEN
Model: Polo l,O5/1,3 (408193) Passat 1,8 (RP 08/90 4 )
Passat 1,8 (AAM +06/92) Passat 1,8 (ABS 406192)
Engine management
Method 1
Ensure ignition switched OFF.
Bridge black data link connector (DLC) terminal 1 fl [A] and
brown or white data link connector (DLC) terminal 1 [B] with
a switched lead - contacts normally open.
Operate switch and hold.
Switch ignition ON.
Release switch after 5 seconds minimum.
Repeat checking procedure to ensure no data remains in
ECM fault memory.
Method 2
Ensure ignition switched OFF.
Disconnect ECM multi-plug or battery earth lead.
NOTE: ECM adaptive memory may be erased causing erratic
running faults. Carry out road test to allow ECM to
re-learn basic values.
WARNING: Disconnecting the battery may erase memory from
electronic units (e.g. radio, clock).
Trouble code identification
Flash 'ype I Faun location
4-digit
0000
1111
End of test sequence
Engine control module (ECM)
I Probable cause
1231 I Vehicle speed sensor (VSS) I Wiring, speedometer, VSS
1232
Idle speed control (ISC) actuator
2113 Crankshaft position (CKP) sensorlengine speed
(RPM) sensor
Closed throttle position (CTP) switch
2121 I
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ECM
Wiring, multi-plug incorrectly wired, ISC actuator
Insecure rotor, wiring, CKPIRPM sensor
Accelerator cable adjustment, CTP switch adjustment,
wiring, CTP switch
221 2 I Throttle position (TP) sensor I Wiring, poor connection, TP sensor
2234
231 2
Engine control module (ECM) - supply voltage
Engine coolant temperature (ECT) sensor
Battery, wiring
2322 I Intake air temperature (IAT) sensor I Wiring, IAT sensor
Wiring, poor connection, ECT sensor
2341 rn Heated oxygen sensor (H02S) - lambda control Heating inoperative, exhaust leak, misfire, fuel
pressurelpump, EVAP canister purge valve
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2342 I
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~eated oxygen sensor (H02S)
I wiring,~~~~, heating inoperative, fuel level low
2413 Mixture control (MC)
Fuel level low, fuel pressurelpump, intakelexhaust leak,
misfire, HOZS, EVAP canister purge valve, injector,
excessive fuel in engine oil
4444 No fault found -
Trouble code may be displayed if engine is not idling during self-diagnosis due to missing CKPIRPM sensor signal. Ignore trouble code
if engine starts.
rn After repairs, erase learnt lambda control values: Wait 30 seconds. Disconnect battery or ECM multi-plug for at least 30 seconds.
Carry out road test to allow ECM to re-learn basic values.