1H-3 Ignition System:
No Spark or Poor Spark
BA02J21804002
Troubleshooting
NOTE
Check that the transmission is in neutral. Check that the fuse is not blown and the battery is fully-
charged before diagnosing.
Step Action Yes No
1 Check the ignition system couplers for poor connections.
Is there connection in the ignition system couplers?
Go to step 2. Poor connection of
couplers.
2 Measure the battery voltage between input lead wires (O
and B/W) at the ECM with the ignition switch in the on
position.
Is the voltage OK?
Go to Step 3. • Faulty ignition switch.
• Faulty engine stop
switch.
• Broken wire harness
or poor connection of
related circuit
couplers.
3 Measure the ignition coil primary peak voltage. Refer to
“Ignition Coil and Plug Cap Inspection” (Page 1H-4).
NOTE
This inspection method is applicable only with
the multi circuit tester and the peak voltage
adaptor.
Is the peak voltage OK?
Go to step 4. Go to step 5.
4 Inspect the spark plug. Refer to “Spark Plug Inspection and
Cleaning” in Section 0B (Page 0B-4).
Is the spark plug OK?
Go to Step 5. Faulty spark plug.
5 Inspect the ignition coil. Refer to “Ignition Coil and Plug Cap
Inspection” (Page 1H-4).
Is the ignition coil OK?
Go to step 6. Faulty ignition coil.
6 Measure the CKP sensor peak voltage and its resistance.
Refer to “Crankshaft Rotation Signal Sensor Inspection”
(Page 1H-7).
NOTE
The CKP sensor peak voltage inspection is
applicable only with the multi circuit tester and
peak voltage adaptor.
Are the peak voltage and resistance OK?
•Faulty ECM.
• Open or short circuit
in wire harness.
• Poor connection of
ignition wire harness.
• Faulty CKP sensor.
• Metal particles or
foreign material being
stuck on the CKP
sensor and rotor tip.
To Next Page
Loading...
Need help?
General
