GDI ± Troubleshooting
13A-90
EGR VALVE (STEPPER MOTOR)
Measurement Method
1. Disconnect the EGR valve connector, and connect the
special tool (test harness: MB991658) in between.
2. Connect the analyzer special patterns pickup to the EGR
valve-side connector terminal 1, terminal 3, terminal 4
and terminal 6 respectively.
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
engine-ECU terminal 34, connection terminal 32,
connection terminal 6, and connection terminal 5
respectively.
Standard Wave Pattern
Observation conditions
Function Special patterns
Pattern height High
Pattern selector Display
Engine condition Racing
Standard wave pattern
(V)
30
20
10
The wave pattern
appears for an
instant, but soon
disappears.
Point B
Coil reverse electromo-
tive force (Approx. 3 ×
10V)
Point A
Induced electromotive force
from the motor turning
Time
EGR
valve
control
signal
wave
pattern
Special
patterns
pickup
Analyzer
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