GDI ± Troubleshooting
13A-87
INJECTORS AND INJECTOR OPEN CIRCUIT CHECK
SIGNAL
Measurement Method
1. Connect the analyzer special patterns pickup to terminal
1 (No.1 injector) of the engine-ECU connector.
2. Connect the analyzer special patterns pickup to terminal
96 (injector open circuit check signal) of the engine-ECU
connector.
3. After checking terminal 1, check terminal 9 (No.2 injector),
terminal 24 (No.3 injector) and terminal 2 (No.4 injector).
Standard Wave Pattern
Observation conditions
Function Special pattern
Pattern height Low
Pattern selector Display
Engine r/min Idle speed
Standard wave pattern
4
0
8
4
0
(V)
Injector
open circuit
check+
signal
Injector
drive signal
(ms)
Wave Pattern Observation Points
D Check that the injector drive time is identical to the time
displayed on the MUT-II.
D Check that the injector signals become greatly extended
but soon return to their normal wave length when the
engine is suddenly raced.
D Check that the injector open circuit check signal is
synchronized with each rising portion of the injector drive
signal.
Special patterns
pickup
Analyzer
Normal wave
pattern
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