SPN 651 Fuel Injector
Circuit Description
The ECM controls the fuel injector by pulse width modulating
the voltage to the injector. If the ECM detects the fuel injector
voltage signal is not within the expected range, a fuel injector
control DTC is set.
Although the DTC indicates the fuel injector is faulty, the
technician must determine if the fault is in the control circuit
from the ECM or the +12v circuit from the main power relay.
NOTE:
Injector resistance between pins 1 and 2 should be
1.8-2.5 ohms at room temperature.
NOTE:
If an ignition coil fault code is active, the fuel injector is
turned off.
Possible FMIs - SPN 651
The possible FMIs for SPN 651 are as follows:
FMI
Description
3
Signal Voltage High
4
Signal Voltage Low/Open
46
Not for
Reproduction
Summary of Contents for 25E300
Page 1: ...Vanguard EFI Diagnostics and Repair 25E300 REPAIR MANUAL N o t f o r R e p r o d u c t i o n...
Page 18: ...Model 25E300 EFI Component Locations 19 N o t f o r R e p r o d u c t i o n...
Page 26: ...Speed vs Voltage Table 8 27 N o t f o r R e p r o d u c t i o n...
Page 61: ...25E300 Wiring Harness Diagram 62 vanguardpower com N o t f o r R e p r o d u c t i o n...
Page 62: ...63 N o t f o r R e p r o d u c t i o n...
Page 88: ...Model 25E300 Fuel Hose Location and Routing Tankless 89 N o t f o r R e p r o d u c t i o n...
