GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
Chart A-3 (3 of 5): Engine Cranks But Will Not Run
Step
Action
Value(s)
Yes
No
1.
2.
3.
4.
Disconnect one injector electri-
cal connector.
Connect test light J34730-2C
to injector harness connector.
While cranking engine, check
for blinking light.
Remove test light and recon-
nect injector harness connec-
tor. Repeat this test for all injec-
tors.
6
–
5.
If any lights are blinking dimly,
check for shorted injector by
comparing injector resistance
values.
Were
Brightly?
All
Lights
Blinking
Go to Step 7
Go to Step 10
1.
2.
3.
Install fuel pressure gauge.
Ignition “OFF” for 10 seconds.
Ignition “ON.” Fuel pump will
run for about 2 seconds
Note fuel pressure with pump
running. The pressure may
drop after the pump stops run-
ning
34-38
(234-262
kPa)
psi
4.
7
Refer to Diag-
nostic Aids on
Facing Page Go to Chart A-4
Is
Specified Value?
Fuel
Pressure
Within
Check
spark.
Is Adequate Spark Present At All
Cylinders?
for
secondary
ignition
8
9
_
Refer to Ignition
Go to Step 9 System Check_
1.
2.
Ignition “OFF.”
Disconnect ECM “J2” connec-
tor.
3.
Using a DVOM connected to
ground, probe “J2-8” of the 1-2 volts
ECM harness connector while
cranking the englne.
Is The Voltage Within The
Specified Value?
Go to Step 20
Go to Step 11
Go to Step 15
Go to Step 12
Was The Test Light A Steady
Light?
10
11
_
Check the injector driver circuit
with the steady light for a short to
ground. If circuit is not shorted,
check resistance across each in- 10 Ohms
jector in the circuit.
Is Resistance Greater Than The
Specified Value?
Go to Step 20
Go to Step 16
Index
Page 5E-68
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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