IGNITION SYSTEM INSPECTION. Honda CBR125R

IGNITION SYSTEM

IGNITION SYSTEM INSPECTION

• If there is no spark at the plug, check all connections for loose or poor contact before measuring the peak voltage.

• Use a commercially available digital multimeter with an impedance of 10 M Ω /DCV minimum.

• The display value differs depending upon the internal impedance of the multimeter.

• If using the Imrie diagnostic tester (model 625), follow the manufacturer’s instructions.

Connect the peak voltage adaptor to the digital multimeter, or use the Imrie diagnostic tester.

TOOL:

Imrie diagnostic tester (model 625) or

Peak voltage adaptor 07HGJ-0020100 with commercially available digital multimeter

(impedance 10 M Ω /DCV minimum)

DIGITAL MULTIMETER

IGNITION COIL PRIMARY PEAK

VOLTAGE

• Check all system connections before performing this inspection. Loose connectors can cause incorrect readings.

• If the system is disconnected, incorrect peak voltage might be measured.

• Check the cylinder compression and check that the spark plug is installed correctly in the cylinder head.

Shift the transmission into neutral and disconnect

the spark plug cap (page 3-9).

Connect a known good spark plug to the spark plug cap and ground it to the cylinder head as done in a spark test.

PEAK VOLTAGE ADAPTOR

KNOWN GOOD SPARK PLUG

17-5

IGNITION SYSTEM

Lift and support the fuel tank (page 3-6).

Open the rubber sheet (page 6-10).

Do not disconnect the ignition coil primary wire.

With the ignition coil primary wire connected, connect the peak voltage adaptor or Imrie tester to the ignition coil primary terminal and ground.

TOOL:

Imrie diagnostic tester (model 625) or

Peak voltage adaptor 07HGJ-0020100 with commercially available digital multimeter

(impedance 10 M Ω /DCV minimum)

Avoid touching the spark plug and tester probes to prevent electric shock.

CONNECTION: Pink/blue (+) – Ground (–)

Shift the transmission into neutral.

Turn the ignition switch ON (and engine stop switch

" ": CM and U type).

Crank the engine with the starter motor with the throttle grip fully opened and read ignition coil primary peak voltage.

PEAK VOLTAGE: 100 V minimum

If the peak voltage is abnormal, follow the checks

described in the troubleshooting table (page 17-4).

Close the rubber sheet (page 6-15).

Remove the suitable support and close the fuel tank

(page 3-6).

IGNITION COIL

PRIMARY TERMINAL

CKP SENSOR PEAK VOLTAGE

Check the cylinder compression and check that the spark plug is installed correctly in the cylinder head.

Remove the ECM (page 5-65).

Connect the peak voltage tester or adaptor probes to the ECM 33P connector terminals of the wire harness side.

TOOLS:

Imrie diagnostic tester (model 625) or

Peak voltage adaptor 07HGJ-0020100 with commercially available digital multimeter

(impedance 10 M Ω /DCV minimum)

Test probe 07ZAJ-RDJA110

ECM 33P CONNECTOR

(Wire side/female terminal)

Bu/Y W/Y

CONNECTION: Blue/yellow (+) – White/yellow (–)

Shift the transmission into neutral.

Turn the ignition switch ON.

Crank the engine with the starter motor with the throttle grip fully opened and read CKP sensor peak voltage.

PEAK VOLTAGE: 0.7 V minimum

If the peak voltage measured at the ECM 33P connector is abnormal, measure the peak voltage at the

CKP sensor connector.

PEAK VOLTAGE ADAPTOR

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