Yamaha Tracer MT09TRA - Service manual > Checking the relay unit (diode)

1. Check:

• Relay unit (diode)

Out of specification → Replace.

Pocket tester 90890-03112 Analog pocket tester YU-03112-C

TIP

The pocket tester or the analog pocket tester readings are shown in the following table.

Continuity Positive tester probe sky blue "1"

Negative tester probe black/yellow "2"

No continuity Positive tester probe black/yellow "2"

Negative tester probe sky blue "1"

Continuity Positive tester probe sky blue "1"

Negative tester probe black/red "3"

No continuity Positive tester probe black/red "3"

Negative tester probe sky blue "1"

Continuity Positive tester probe sky blue "1"

Negative tester probe sky blue/white "4"

No continuity Positive tester probe sky blue/white "4"

Negative tester probe sky blue "1"

Continuity Positive tester probe blue/black "5"

Negative tester probe black/red "3"

No continuity Positive tester probe black/red "3"

Negative tester probe blue/black "5"

a. Disconnect the relay unit coupler from the wire harness.

b. Connect the pocket tester (* 1) to the relay unit terminal as shown.

c. Check the relay unit (diode) for continuity.

d. Check the relay unit (diode) for no continuity.

Checking the ignition coils

The following procedure applies to all of the ignition coils.

1. Check:

• Primary coil resistance

Out of specification → Replace.

Primary coil resistance 1.19-1.61

a. Remove the ignition coil from the spark plug.

b. Connect the pocket tester (* 1) to the ignition coil as shown.

Pocket tester 90890-03112

Analog pocket tester YU-03112-C

• Positive tester probe → red/black "1"
• Negative tester probe → Cylinder-#1 ignition coil orange "2" Cylinder-#2 ignition coil gray/red "2" Cylinder-#3 ignition coil orange/green "2"

c. Measure the primary coil resistance.

2. Check:

• Secondary coil resistance

Out of specification → Replace.

Secondary coil resistance 9.35-12.65 k

a. Connect the pocket tester (*1 k) to the ignition coil as shown.

Pocket tester 90890-03112

Analog pocket tester YU-03112-C

• Negative tester probe → red/black "1"
• Positive tester probe → spark plug terminal "2"

b. Measure the secondary coil resistance.

Checking the ignition spark gap

1. Check:

• Ignition spark gap

Out of specification → Perform the ignition system troubleshooting, starting with step 5.

Minimum ignition spark gap 6.0 mm (0.24 in)

TIP

If the ignition spark gap is within specification, the ignition system circuit is operating normally.

a. Remove the ignition coil from the spark plug.

b. Connect the ignition checker "1" as shown.

Ignition checker 90890-06754

Oppama pet-4000 spark checker YM-34487

2. Ignition coil

c. Turn the main switch to "ON".

d. Measure the ignition spark gap "a".

e. Crank the engine by pushing the " " side of the start/engine stop switch and gradually increase the spark gap until a misfire occurs.

Checking the crankshaft position sensor

1. Disconnect:

• Crankshaft position sensor coupler (from the wire harness)

2. Check:

• Crankshaft position sensor resistance

Out of specification → Replace the crankshaft position sensor.

Crankshaft position sensor resistance 228-342 (Gy-B)

a. Connect the pocket tester (* 100) to the crankshaft position sensor coupler as shown.

Pocket tester 90890-03112 Analog pocket tester YU-03112-C

• Positive tester probe gray "1"
• Negative tester probe black "2"

b. Measure the crankshaft position sensor resistance.

See also: