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TM 9-2320-360-20-3
Section 5
DIAGNOSTIC DATA READER INFORMATION (Cont’d)
D. FUEL INJECTOR INFORMATION
Fuel Injector Menu Selections are defined as follows:
- Cylinder Cutout
- Response Times
- View Injector Calibration
- Update Injector Calibration
D.1 CYLINDER CUTOUT
The cylinder cutout function provides a test method to locate a injector whose pulse width output is different from the others.
This is done by cutting out one injector at a time and comparing the resulting injector pulse width with the no cut-out pulse width
established before the first cylinder was cutout.
Cylinder cutout test options:
(1) Run New Test or Review Last Results
(2) Select RPM Setting: IDLE or 1000 RPM
(3) Automatic Test or Manual Test
D.2 RESPONSE TIMES
The injector solenoid response times are defined as the time it takes from when the DDEC Ill ECM requests an injector be
turned on to when the injector solenoid valve actually closes.
Injector response times generally increase with low battery supply voltage and decrease with high battery supply voltage.
Although injector response times vary from injector to injector at a given RPM, each individual injector response time should
remain relatively consistent from one firing to the next. Wide variations in response time typically +/- 0.2 msec) for one injec-
tor at a steady RPM may indicate an electrical problem (faulty alternator or voltage regulator, poor or broken ground cables,
etc.).
H-280
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