9-20 |
ELECTRICAL SYSTEM |
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IGNITION SYSTEM |
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Engine stop switch |
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ECM |
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Side- |
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#1 |
stand |
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Power source |
relay |
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circuit |
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CKP |
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#2 |
Fuse |
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sensor |
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Waveform |
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arrangement |
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Ignition |
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circuit |
#3 |
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switch |
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CPU |
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#4 |
Fuse |
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CMP |
Waveform |
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arrangement |
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sensor |
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circuit |
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Battery |
TP |
ECT |
GP |
E |
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sensor |
sensor |
switch |
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NOTE: |
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L |
The fuel cut-off circuit is incorporated in this |
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in order to prevent over-running of engine. When engine |
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P |
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ECM |
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speed reaches 15 500 r/min, this circuit cuts off fuel at the fuel injector. But under no load, the clutch lever is
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A |
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pulled or the gear position is neutral, this circuit cuts off fuel when engine speed reaches 15 100 r/min. |
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E-03, 24, 33: The circuit cuts off the ignition primary current for all spark plugs. |
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Under no load, the engineScan run over 15 100 r/min though the ignition cut-off circuit is effec- |
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tive, which may possibly cause engine damage. Do not run the engine without load over 15 100 |
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r/min at anytime. |
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ELECTRICAL SYSTEM 9-21
IMMOBILIZER (Except for E-03, 28, 33)
DESCRIPTION
The immobilizer, an anti-theft system, is installed as a standard equipment.
The immobilizer verifies that the key ID agrees with ECM ID by means of radio communication through the immobilizer antenna. When the ID agreement is verified, the system makes the engine ready to start.
Indicator light
Immobi-antenna
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Indicator light |
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Immobilizer |
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Transponder |
antenna |
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P |
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M |
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ECM |
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ID |
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A |
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S |
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ELECTRICAL SYSTEM 9-23
TROUBLESHOOTING
No spark or poor spark
NOTE:
Check that the transmission is in neutral and the engine stop switch is in the “RUN” position. Grasp the clutch lever. Check that the fuse is not blown and the battery is fully-charged before diagnosing.
Step 1
1)Check the ignition system couplers for poor connections. Is there connection in the ignition system couplers?
YES |
Go to Step 2. |
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NO |
Poor connection of couplers |
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. |
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• Faulty ignition switch |
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NO |
• Faulty turn signal/side-stand relay |
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• Faulty engine stop switch |
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• Broken wire harness or poor connection of related circuit couplers |
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Step 3 |
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1) Measure the ignition coil primary peak voltage. P( 9-25) |
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NOTE: |
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A |
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This inspection method is applicable onlyMwith the multi circuit tester and the peak volt adaptor. |
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S |
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Is the peak voltage OK? |
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YES |
Go to tep 4. |
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NO |
Go to Step 5. |
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Step 4
1)Inspect the spark plugs. ( 2-5 to -6) Is the spark plug OK?
YES |
Go to Step 5. |
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NO |
Faulty spark plug(-s). |
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9-24 ELECTRICAL SYSTEM
Step 5
1)Inspect the ignition coil/plug caps. ( 9-26) Is the ignition coil/plug cap OK?
YES |
Go to Step 6. |
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NO |
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Poor connection of the ignition coil/plug cap(-s). |
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Faulty ignition coil/plug cap(-s). |
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Step 6
1) Measure the CKP sensor peak voltage and its resistance. ( 9-27 to -28)
NOTE:
The CKP sensor peak voltage inspection is applicable only with the multi circuit tester and peak volt adaptor.
Is the peak voltage and resistance OK?
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Faulty ECM |
YES |
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Open or short circuit in wire harness |
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• Poor connection of ignition couplers |
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NO |
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Faulty CKP sensor |
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Metal particles or foreign material being stuck on the CKP sensor and rotor tip |
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E |
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ELECTRICAL SYSTEM 9-25
INSPECTION
IGNITION COIL PRIMARY PEAK VOLTAGE
•Remove the air cleaner box. ( 5-14)
•Disconnect all the ignition coil/plug cap lead wire couplers before removing the ignition coil/plug caps.
•Remove all of the ignition coil/plug caps.
* Do not remove the ignition coil/plug cap before disconnecting the lead wire coupler, or the lead wire will be damaged.
* Do not pry up the ignition coil/plug cap with a screwdriver or a bar to avoid damage.
* Be careful not to drop the ignition coil/plug cap as it may open or short in a circuit.
• Connect the new four spark plugs to each ignition coil/plug cap. |
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• Connect all the ignition coil/plug cap lead wire couplers to the |
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ignition coil/plug caps respectively, and ground them on the |
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cylinder head (each spark plug hole). |
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Avoid grounding the spark plugs and suppling the |
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New spark |
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electrical shock to the cylinder head cover (magne- |
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plug |
Contact to |
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P |
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the cylinder head |
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sium parts) to prevent the magnesium material from |
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damage. |
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NOTE: |
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Be sure that all couplers and spark plugs are connected properly |
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and the battery used is in fully-charged condition. |
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S |
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Inspect each ignition coil primary peak voltage at the ignition coil/plug cap coupler.
• Connect the multi-circuit tester with peak voltage adaptor as follows.
No. 1 ignition coil/plug cap:
W/Bl wire terminal (+ Probe) – Ground (- Probe) terminal No. 2 ignition coil/plug cap:
Black wire terminal (+ Probe) – Ground (- Probe) terminal No. 3 ignition coil/plug cap:
Yellow wire terminal (+ Probe) – Ground (- Probe) terminal
No. 4 ignition coil/plug cap: |
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Peak volt |
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Green wire terminal (+ Probe) – Ground (- Probe) terminal |
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adaptor |
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09900-25008: Multi-circuit tester set |
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09900-25009: Needle pointed probe set |
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ECM |
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To engine |
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stop switch |
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Before using the multi-circuit tester and peak volt |
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IG coil |
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adaptor, be sure to refer to the appropriate instruction |
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manual. |
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9-26 ELECTRICAL SYSTEM
NOTE:
Use the special tool, to prevent the rubber of the water proof coupler from damage.
•Shift the transmission into neutral and turn ignition switch “ON”.
•Crank the engine a few seconds with the starter motor by depressing starter button and check the ignition coil primary peak voltage.
•Repeat the above inspection a few times and measure the highest peak voltage.
Tester knob indication: voltage ( )
Ignition coil primary peak voltage: 80 V and more
If the peak voltage is lower than the standard range, check the |
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ignition coil/plug cap as follow. |
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IGNITION COIL/PLUG CAP RESISTANCE |
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L |
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• Check the ignition coil/plug cap for resistance in both primary |
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and secondary coils. If the resistance is not within the stan- |
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dard range, replace the ignition coil/plug cap with a new one. |
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09900-25008: Multi-circuit tester set |
M |
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Tester knob indication: Resistance (Ω) |
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A |
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Ignition coil/plug cap resistance |
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Primary : 1.1 – 1.9 Ω (+ tap – - tap) |
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S |
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Secondary: 10.8 – 16.2 kΩ (Plug cap – - tap) |
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ELECTRICAL SYSTEM 9-27
CKP SENSOR PEAK VOLTAGE
• Remove the front seat. ( 8-7)
NOTE:
Be sure that all couplers are connected properly and the battery used is in fully-charged condition.
•Disconnect the both couplers 1.
•Connect the multi-circuit tester with peak volt adaptor as follows.
•Measure the CKP sensor peak voltage between Orange/Blue and Green/White lead wires at the ECM coupler (Black) A.
G/W wire (+ Probe) – O/Bl wire (- Probe)
09900-25008: Multi-circuit tester set |
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G/W |
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09900-25009: Needle pointed probe set |
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A Black coupler |
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O/Bl |
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* Before using the multi-circuit tester and peak volt |
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adaptor, be sure to refer to the appropriate instruc- |
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tion manual. |
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* Normally, use the needle pointed probe to the back- |
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side of the lead wire coupler to prevent the terminal |
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bend and terminal alignment. |
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• Shift the transmission into the neutral and turn ignition switch |
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“ON”. |
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ECM |
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• Crank the engine a few secondsAwith the starter motor by |
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CKP sensor coupler |
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coupler |
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depressing starter button and check the CKP sensor peak |
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O/BlG W |
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voltage. |
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G/WW |
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CKP sensor |
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• Repeat the above test procedure a few times and measure |
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Peak |
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the highest peak voltage. |
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volt |
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Tester knob indication: Voltage ( ) |
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adaptor |
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CKP sensor peak voltage: 0.28 V and more |
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(Orange/Blue – Green/White) |
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9-28 ELECTRICAL SYSTEM
If the peak voltage is lower than the standard range, check the |
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peak voltage at the CKP sensor lead wire coupler. |
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• Remove the front seat. ( 8-7) |
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• Lift and support the fuel tank. ( 5-3) |
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• Disconnect the CKP sensor lead wire coupler and connect the |
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multi-circuit tester with the peak volt adaptor. |
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Black wire (+ Probe) – Green wire (- Probe) |
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• Measure the CKP sensor peak voltage at the CKP sensor |
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lead wire coupler. |
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Tester knob indication: Voltage ( ) |
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CKP sensor peak voltage: 0.28 V and more |
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(Green – Black) |
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CKP sensor |
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If the peak voltage is lower than the standard range, check each |
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coupler |
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coupler connection or replace the CKP sensor and inspect it |
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again. |
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CKP sensor |
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If the peak voltage is within the specification, check the continu- |
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Peak |
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ity between the CKP sensor coupler and ECM coupler. |
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volt |
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adaptor |
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CKP SENSOR RESISTANCE |
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• Measure the resistance between the lead wires and ground. If |
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CKP sensor |
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the resistance is not as specified, the CKP sensor must be |
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coupler |
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replaced. |
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09900-25008: Multi-circuit tester set |
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CKP sensor |
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Tester knob indication: ResistanceA(Ω) |
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CKP sensor resistance: 142 – 194 Ω (Green – Black) |
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∞ Ω (Green – Ground) |
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