Vanguard 25E300, Repair Manual

Page: 52 / 104

SPN 1268, FMI 3: Short to High/Open
Step Action Yes No
1 1. Perform the Ignition Coil Spark Test. See TEST PROCEDURES in this section.
2. Did the test Pass?
Problem does not
currently exist.
Go to step 2.
2 1. Turn Ignition OFF.
2. Obtain a Briggs & Stratton Spark Tester (Part No. 19368).
3. Install spark tester in line with ignition coil and spark plugs.
4. Look for spark in tester windows while cranking engine.
5. Is spark observed? No current problem. Go to step 3.
3 1. Turn Ignition OFF.
2. Back probe (using fused patch cord) terminal 1 (Yellow wire) of ignition coil connector.
3. Connect terminal 1 back probe to red meter test lead on DVOM.
4. Connect black meter test lead on DVOM to a known good ground.
5. Set DVOM to read volts DC.
6. Turn Ignition ON, Engine OFF.
7. Does DVOM read 12.2-13.5 volts DC? Go to step 4. Reading is below
12.2 volts DC.
Perform visual
and continuity
check of 10 amp
Battery fuse (Red).
4 1. Turn Ignition OFF.
2. Remove probe from terminal 1, and back probe terminal 2 (Violet/Black wire) of ignition coil
connector.
3. Disconnect ECM connector.
4. Back probe terminal B2 (Violet/Black wire) of ECM connector.
5. Connect terminal B2 back probe to black meter test lead on DVOM.
6. Set DVOM to read resistance.
7. Does DVOM read between 0.43-0.65 ohms?
Check wire harness.
Repair or replace
wire harness.
Replace
ignition coil.
Resistance
reading is above
0.65 ohms.
Repair or replace
wire harness.
53
Not for
Reproduction