Suzuki VZ800 Service Manual page 370

Step 2
1) Measure the battery voltage between input lead wires at the ECM with the ignition switch in the "ON"
position. (E-02, 19, 24: O/G and B/W, E-03, 28, 33: O/W and B/W)
Is the voltage OK?
YES Go to Step 3.
• Faulty ignition switch
• Faulty turn signal/side-stand relay
NO
• Faulty engine stop switch
• Broken wire harness or poor connection of related circuit couplers
Step 3
1) Measure the ignition coil primary peak voltage. (9-22)
NOTE:
This inspection method is applicable only with the multi circuit tester and the peak volt adaptor.
Is the peak voltage OK?
YES Go to Step 4.
NO Go to Step 5.
Step 4
1) Check the plug caps for poor contacts.
2) If OK, then inspect the spark plugs. (2-6)
Are the spark plugs OK?
YES Go to Step 5.
NO Faulty spark plug(-s)
Step 5
1) Inspect the ignition coils. (9-23)
Are the ignition coils OK?
YES Go to Step 6.
NO Faulty ignition coil(-s)
Step 6
1) Measure the CKP sensor peak voltage and its resistance. (9-23 to -24)
NOTE:
The CKP peak voltage inspection is applicable only with the multi-circuit tester and peak volt adaptor.
Are the peak voltage and its resistance OK?
• Faulty ECM
YES • Open or short circuit in wire harness
• Poor connection of ignition couplers
NO • Faulty CKP sensor
• Metal particles or foreign material being stuck on the CKP sensor and rotor tip
ELECTRICAL SYSTEM 9-21