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

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Model: Polo 1,0511,3 (+08193) Passat 1,8 (RP 081904)<br />

Passat 1,8 (AAM +06192)<br />

Passat 1,8 (ABS -*06/92)<br />

Year: 1990-93<br />

Engine code:<br />

System:<br />

AAM, ABD, ABS, AAU, AAV, RP<br />

Bosch Mono-Motronic MA1.2<br />

Bosch Mono-Motronic MA1.2.1<br />

4<br />

VOLKSWAGEN 'k4f<br />

Engine management<br />

Polo - under fascia, near glovebox<br />

Passat - centre console<br />

NOTE: 35 pin ECM multi-plug.<br />

General information<br />

0 Refer to the front of this manual for general test conditions,<br />

terminology, detailed descriptions of wiring faults <strong>and</strong> a<br />

general trouble shooter for electrical <strong>and</strong> mechanical faults.<br />

<strong>Trouble</strong> codes are displayed by using an LED connected to<br />

one of the ECM terminals.<br />

0 The ECM fault memory can also be checked <strong>and</strong> erased<br />

using diagnostic equipment connected to the data link<br />

connector (DLC).<br />

Self-diagnosis using flash type trouble codes may not<br />

display all available diagnostic information.<br />

0 Carry out road test for at least 10 minutes.<br />

n Ensure accelerator pedal is briefly fully depressed <strong>and</strong><br />

engine speed exceeds 3000 rpm.<br />

Release switch. Check that LED flashes.<br />

Count LED flashes. Note trouble code.<br />

Each trouble code consists of four groups of one to four<br />

flashes.<br />

0 A 2,5 second pause separates each trouble code group [A].<br />

Repeat switch operation. Note trouble codes. Compare with<br />

trouble code table.<br />

End of test sequence indicated by trouble code 0000<br />

(long flashes).<br />

Switch ignition OFF. Rectify faults as necessary.<br />

Accessing<br />

Ensure ignition switched OFF.<br />

Bridge black data link connector (DLC) terminal 1 rn [A] <strong>and</strong><br />

brown or white data link connector (DLC) terminal 1 rn [B]<br />

with a switched lead - contacts normally open.<br />

Connect LED test lamp between black data link connector<br />

(DLC) terminal 2 [A] <strong>and</strong> ECM terminal 33.<br />

ECM located in plenum chamber.<br />

NOTE: DO NOT disconnect ECM multi-plug as this will erase fault<br />

memory.<br />

Start engine. Allow to idle.<br />

NOTE: If engine does not start: Crank engine for 6 seconds.<br />

Leave ignition switched ON.<br />

Operate switch for 4 seconds minimum<br />

/<strong>Autodata</strong><br />

Engine management 761

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