Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 220
DME 7.8 DME 7.8 0 · 115 Mass air flow sensor – below limit
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DME 7.8 DME 7.8 0
0-9P0102
115 Mass air flow sensor – below limit
Diagnosis conditions
• Engine running
• Battery voltage greater than 8 V
Possible fault cause
♦Open circuit
♦Short circuit to ground
♦Mass air flow sensor 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 wiring from MAF ♦Remove connector of MAF sen- 0 - 5 Ω Repair wiring har-
sensor to DME control sor ⇒ Step 2 ness
module for continuity. → End ♦Connect special tool 9637 to
wiring harness (DME control
module connector).
♦Measure resistance between
special tool 9637 Pin III/23 and
MAF sensor plug Pin 5
2 Check wiring from MAF ♦Remove connector of MAF sen- ∞ Ω Repair wiring har-
sensor to DME control sor ⇒ Step 3 ness
module for short to → End ♦Connect special tool 9637 to
ground wiring harness (DME control
module connector).
♦Measure resistance between
special tool 9637 Pin III/23 and
ground
2445 P0102 0-9 page 1
Printed in Germany, 2000 p0102
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