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TROUBLESHOOTING
No spark at spark plug
UNUSUAL CONDITION
PROBABLE CAUSE (Check in numerical order)
IGNITION SYSTEM
18-2
Inspect the following before diagnosing the system.
Low peak voltage
No peak voltage
Peak voltage is normal, but no spark
jumps at plug
Low peak voltage
No peak voltage
Ignition coil
primary
voltage
Ignition
pulse
generator
If the plug is no spark, faulty ICM.
If the plug is sparks, faulty sub-ICM.
Early products of the TE/FE model only (equipped with sub-ICM):
If the result of the troubleshooting was likely to malfunction the ‘‘ICM’’, check as follows.
Disconnect the sub-ICM connectors and connect the main harness side 8P (gray)
connector to the ICM and perform the spark test.
Faulty spark plug
Loose spark plug cap or spark plug wire connections
Water got into the spark plug cap (Leaking the ignition coil secondary voltage)
Incorrect peak voltage adaptor connections. (System is
normal if measured voltage is over the specifications
with reverse connections.)
The multimeter impedance is too low; below 10M
/
DCV.
Cranking speed is too low. (Battery is undercharged.)
The sampling timing of the tester and measured pulse
were not synchronized. (System is normal if measured
voltage is over the standard voltage at least once.)
Poorly connected connectors or an open circuit in
ignition system.
Faulty gear position switch.
An open circuit or loose connection in No. 6 related
circuit (light green/red wire).
Faulty ignition coil.
Faulty ignition control module (ICM). (when above No.
1 through 8 are normal.)
Incorrect peak voltage adaptor connections. (System is
normal if measured voltage is over the specifications
with reverse connections.)
Battery is undercharged. (Voltage drops largely when
the engine is started.)
Faulty ignition switch or engine stop switch.
Loose or poorly connected ICM connector.
No voltage at the black/white wire of the ICM.
Open circuit or poor connection in ground (green) wire
of the ICM.
Faulty gear position switch.
An open circuit or loose connection in No. 7 related
circuit (light green/red wire).
Faulty peak voltage adaptor.
Faulty ignition pulse generator. (Measure peak voltage.)
Faulty ICM. (when above No. 1 through 10 are normal.)
Faulty spark plug or leaking ignition coil secondary
current ampere.
Faulty ignition coil.
The multimeter impedance is too low; 10M
/DCV.
Cranking speed is too slow. (Battery is undercharged.)
The sampling timing of the tester and measured pulse
were not synchronized. (System is normal if measured
voltage is over the standard voltage at least once.)
Faulty ignition pulse generator. (when above No. 1
through 3 are normal).
Faulty peak voltage adaptor.
Faulty ignition pulse generator.
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CONNECTORS
SUB-ICM
ICM
03/01/08 14:10:26 61HN400K_011