GDI ± Troubleshooting
13A-84
INSPECTION PROCEDURE USING AN ANALYZER
AIR FLOW SENSOR (AFS)
Measurement Method
1. Disconnect the air flow sensor connector, and connect
the special tool (test harness: MB991709) in between.
(All terminals should be connected.)
2. Connect the analyzer special patterns pickup to air flow
sensor connector terminal 3.
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
engine-ECU terminal 61.
Standard Wave Pattern
Observation conditions
Function Special patterns
Pattern height Low
Pattern selector Display
Engine r/min Idle speed
Standard wave pattern
(V)
10
0
The time (cycle time) T is reduced when
the amount of intake air increases.
Times T1 and T2 are equal.
Time
T
T1 T2
Observation conditions (from conditions above engine speed is increased by racing.)
Time
(V)
10
0
T
Wave Pattern Observation Points
Check that cycle time T becomes shorter and the frequency increases when the engine speed is increased.
Analyzer
Special
patterns
pickup
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