Porsche Boxster Technical Manual page 51

Boxster DME diagnosis 24
e
Test point 7
Oxygen sensing Fault: Lean limit
range 2 and range 1, Mixture is so rich that the control is at its lean limit.
cylinders 4 -6
DTC 34, 35, 36 Fault area: Fuel pressure too high or injection valve leaks.
Remedy: 1. Check fuel pressure.
2. Check fuel pressure regulator, vacuum connection and
fuel return line.
Fault: Rich limit
Mixture is so lean that the control is at its rich limit.
e Fault area: -Intake system leaks
-Fuel pressure too low
-Injection valves fouled
-Fuel pump delivery too low
Remedy: 1. Check exhaust system for leaks.
2.Check intake system for leaks.
3. Check fuel pressure.
4. Check fuel pump delivery.
5. Clean injection valves in ultrasound cleaning device
8 or replace.
e
2401 DiagnosisjTroubleshooting DME 24 -D 35
Printed In Germany -4, 1996 9862401
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