Briggs & Stratton BIG BLOCK EFI, Руководство по ремонту

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46 Section 2: Troubleshooting DTCs
Circuit Description
The ECM controls each fuel injector by
grounding the control circuit via a solid state
device called a driver. If the ECM detects an
unacceptable difference in resistance, a fuel
injector control DTC is set.
Although the DTC indicates which fuel injector
is faulty, the technician must determine if the
fault is in the ground circuit or the +12v circuit
from the MPR.
NOTE: If an ignition coil fault code is active,
the fuel injector for the same cylinder is turned
off.
Diagnostic Aids
Check for the following conditions:
1. Poor ECM connection.
2. Inspect wire harness connectors for backed
out terminals, improper mating, broken
locks, improperly formed or damaged termi-
nals, and poor terminal to wire connection.
3. Inspect wiring harness for damage.
4. Check fuse block for an open fuse.
Always clear DTCs after performing repairs.
DTC P0201/P0202 Cylinder 1 or Cylinder 2 Fuel Injector Fault
Injector
Driver B
Cylinder 2
Fuel
Injector
B
A
Cylinder 1
Fuel
Injector
B
A
Injector
Driver A
J2 06 J2 05
ECM
RED RED
LT. BLUE/BLACK
LT. BLUE/WHITE
From
Main Power Relay