Section 07 ENGINE MANAGEMENT (DI)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
OK
no
F12A06S
Air pressure less
than 621 kPa
(90 PSI)
FUEL DELIVERY SYSTEM DIAGNOSTIC FLOW CHART
line
OK
Crank or start engine
Install pressure gauge on
fuel pressure line
Connect safety lanyard
Fuel pump runs
Fuel pressure less
than 185 kPa (27 PSI)
Fuel pressure
more than
185 kPa
(27 PSI)
Fuel pressure
is 185 kPa
(27 PSI)
System OK
Check fuel lines
for leaks
Check fuel filters
Repair or
replace
Perform fuel
pump test
Proceed to air
compressor
pressure test
Fuel pressure lower
than 735 kPa (107 PSI)
Check for
blocked fuel
return line
Repair or replace
Line OK
yes
Replace
fuel pump
module
Fuel pressure
is 735 kPa
(107 PSI)
Fuel pressure
greater than
735 kPa
(107 PSI)
Check air
return
line for
blockage
Check
for air
leaks
Repair
leaks
Check direct
injector
yes
Perform fuel
pump test
Replace
fuel pump
module
pass
no
leaks
Check
RAVE
for air
leaks
Repair air
compressor
Air pressure more
than 621 kPa
(90 PSI)
OK
Replace
direct
injector
Connect safety lanyardFuel pump does not run
Fuel pump runs
for 2 sec. then stops
Check fuses
Check lanyard connection
Check pump module operation
Repair or replace if necessary
test OK
OK
fails
Replace fuel
pressure
regulator
Replace air
pressure
regulator
Retest
Direct
injector
OK
Check air/fuel rail for leaks
Repair/replace air/fuel rail
OK
fails
fails
no
leaks
fails
Repair
leaks
Fast
pressure
drop
yes
no
Verify
fuel pump
check valve
fails
Replace
fuel pump
OK
Ensure
air/fuel
rail is not
leaking
yes
Check fuel
injector
Repair/replace
air/fuel rail
OK
fails
Replace fuel
injector
Replace fuel
pressure
regulator
fails
NOTE:
The tolerance for the pressure is ± 14 kPa (2 PSI).
356 smr2004-Complete Line Up
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