Vanguard 25E300, Repair Manual

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Engine Cranks But Does Not Start
Step Action Yes No
1 Perform OBD System Check.
Are any DTCs found? Go to applicable DTC Table. Go to step 2.
2 Perform a careful visual check.
Is a problem found? Repair Go to step 3.
3 Verify fuel in tank(s).
Is there insufficient fuel in tank(s)? Go to step 4. Add fuel.
4 Check fuel shut off valve, if equipped.
Is fuel shut off valve closed? Open fuel shut off valve. Go to step 5.
5 Check the following fuel system components for dirt, water, or other
contaminants.
• Fuel tanks
• Fuel filter
• Fuel lines
• Fuel pumps
Is a problem found?
Repair Go to step 6.
6 Verify that there is fuel flow flow from the mechanical fuel pump to
the fuel injector.
Is a problem found?
Repair Go to step 7.
7 Verify safety interrupt is NOT active or faulty, if equipped.
Is a problem found? Repair Go to step 8.
8 Check battery as follows:
• Look for loose or corroded terminals.
• Verify battery voltage is 12.2-13.5 volts.
Is a problem found?
Repair Go to step 9.
9 Verify that cylinder is getting spark. See Repair Manual.
Is a problem found? Repair Go to step 10.
10 See VERIFY ECM POWERS UP in SECTION 3 -
TROUBLESHOOTING DTCs.
Is a problem found?
Repair Go to step 11.
11 Check engine for the following mechanical problems:
• Low compression/leak down.
• Leaking cylinder head gaskets.
• Proper valve set up.
See Repair Manual.
Is a problem found?
Repair Go to step 12.
12 Review diagnostic procedures in this table. If all steps have been
completed and no problems have been found, proceed as follows:
• Repeat visual check.
• Review Diagnostic Tool/Code Reader data.
• Check all electrical connections within the suspect circuit and/
or system.
Is a problem found?
Repair Contact engine
manufacturer.
67
Not for
Reproduction