DME 7.8 DME 7.8 0 · 0-10P0103

DME 7.8 DME 7.8 0 0-10P0103 115 Mass Air Flow Sensor - Above Limit Diagnosis conditions • Engine running • Battery positive voltage greater than 8 V Possible fault cause ♦Intake air system on pressure side (between turbocharger and engine) leaks ♦Short circuit to B+ ♦Mass air flow sensor faulty ♦Throttle jacking unit faulty Note! In the case of a fault, the PSM is switched off. Affected terminals Terminal III/23 Diagnosis/Troubleshooting Work instruction Display OK If not OK 1 Check intake air system for leaks. ⇒ Step 2. Repair intake air system → End. 2 Check wiring from MAF ♦Remove connector of MAF sen- 0 V sensor to DME control sor. ⇒ Step 3. module for short to B+. ♦Connect special tool 9637 to wiring harness (DME control module plug). ♦Measure voltage between spe- cial tool 9637 pin III/23 and ground. ♦Switch on the ignition. 3 Check signal from MAF ♦Check voltage signal from MAF 0.9 to 1.1 V. Replace MAF sensor sensor. sensor with ’Ignition on’ (with ⇒ Step 5. Porsche System Tester 2 in the ’Actual values/mass air flow’ menu, or with a voltmeter and special tool 9637). 2445 P0103 0-10 page 1 Printed in Germany – 3, 2001 p0103