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6.
Pull on each wire from each CDM harness plug. Make sure all wires are making proper contact inside plugs.
7.
Disconnect the CDM modules one at a time and see if you get spark back on the other cylinders. A shorted stop circuit in one CDM will
prevent ALL cylinders from sparking.
8.
Check the Trigger and Charge coil flywheel magnets for cracked, broken, or loose magnets.
9.
Check the resistance and diodes of each of the CDM modules as follows:
Red Meter Lead
CDM Pin #
(A) Ground
CDM Pin #
(D) Stator
CDM Pin #
(A) Ground
CDM Pin #
(D) Stator
CDM Pin #
(B) Kill Circuit
CDM Pin #
(A) Ground
CDM Pin #
(B) Kill Circuit
-
High Tension Lead
* This Measurement is with the meter set to the diode scale. Where you see the term "Reading" represents a reading on the
meter. Where you see the term "Open" represents no value showing on the meter.
INTERMITTENT SPARK OR NO SPARK ON ONE OR MORE CYLINDERS:
1.
Check the resistance of the Black wire in the 4 pin connector to the CDM in reference to a good clean engine ground. It should show a
short, less than 0.5 Ω. A high reading or an open reading indicates a break in the Black wire. Check the wire at the ground terminal.
2.
If the cylinders are only showing a problem above an idle, connect an inductive Tachometer to all cylinders and try to isolate the
problem cylinders.
HIGH SPEED MISFIRE OR WEAK HOLE SHOT:
1.
Connect a DVA meter from the White/Green to the Green/White wires and do a running test. The voltage should show a smooth climb
throughout the RPM range. A sudden drop or decline in voltage indicates a problem usually found in the Stator.
2.
Disconnect the Voltage Regulator and retest. If the problem disappears, replace the Voltage Regulator.
3.
Rotate the Stator one bolt hole in either direction and re-test. If the miss is gone, leave the Stator as is. If the miss is worse, rotate the
Stator back to where it was.
INTERMITTENT SPARK OR NO SPARK ON ONE OR MORE CYLINDERS:
1.
Check the Stator resistance and DVA as given below:
Read from
White/Green (Stator)
Green/White (Stator)
2.
Check the Trigger DVA as shown below:
Read from
Read to
Purple (#1 Trigger)
Engine Gnd
White (#2 Trigger)
Engine Gnd
**A DVA reading that is close to the same reading connected as disconnected may indicate a broken ground wire.
NOTE: As these Triggers have the Bias circuit built into them, you cannot perform a Resistance test on the Trigger.
3.
If one cylinder is not sparking, swap the White/Green and Green/White Stator wires and retest. If the problem moves to the other
cylinder, the Stator is likely bad. A continued no spark condition on the same cylinder potentially indicates a bad Trigger.
4.
If # 1 is not firing, disconnect #2 CDM module. Check to see which Stator wire feeds #2 CDM and by using a jumper wire, short that
side of the Stator to engine ground. If # 1 starts firing, replace the #2 CDM.
5.
For #2 CDM not firing, short the Stator wire that feeds the #1 CDM. Again, if the #2 CDM starts firing, replace the #1 CDM.
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Rev F • 6/19/2023
Installation and Troubleshooting Guide
This installation is to be completed by an Authorized Dealer or Professional Service
Technician. For questions regarding installation or warranty, call CDI Tech Support
at 866-423-4832. Do not return to the Dealer or Distributor where the part was purchased.
Contact CDI Electronics Directly for Return Material Authorization.
Black Meter Lead
(C) Trigger
(A) Ground
(D) Stator
(B) Kill Circuit
(D) Stator
(B) Kill Circuit
(A) Ground
(A) Ground
2 CYLINDER CDM IGNITION TROUBLESHOOTING
Read to
OEM Ohms
500-700 Ω
Ohms
Open
Open
CDI Electronics, LLC • 353 James Record Road SW • Huntsville, AL 35824 USA
www.cdielectronics.com
OEM Reading
1.2-1.4K Ω
Open*
Reading*
Reading*
Open*
Reading*
High M Ω or Open*
0.7-1.3K Ω
CDI Ohms
400-550 Ω
DVA Connected
0.5-1.5 V**
0.5-1.5 V**
• Tech Support: 1-866-423-4832 • Order Parts: 1-800-467-3371
Page - 2 of 6
CDI Reading
1.2-1.4K Ω
Open*
Reading*
Reading*
Open*
Reading*
High M Ω or Open*
2.2-2.4K Ω
DVA (Connected)
DVA (Disconnected)
180-400 V
DVA Disconnected
5 V or more
5 V or more
200-400 V
QF-358
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