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NO SPARK OR INTERMITTENT SPARK ON ONE OR MORE CYLINDERS:
1.
Inspect the spark plug wires, boots, and spark plugs. Check for chafing on the wiring and harnesses.
2.
Clean and inspect all CDM ground wire connections to engine ground.
3.
Check the Stator resistance and DVA as given below:
Read from
Read to
White/Green Green/White
4.
Check the Trigger DVA as shown below:
Read from
Read to
Purple (#1 Trigger)
Engine Gnd
White (#2 Trigger)
Engine Gnd
Brown (#3 Trigger)
Engine Gnd
5.
If (#1 and #3) or (#1 and #2) or (#2 and #3) is not sparking, swap the White/Green and Green/White Stator wires and retest. If the
problem moves to the other cylinder(s), the Stator is likely bad. If no change, replace all CDMs. A continued no spark condition on the
same cylinder(s) indicates a bad Trigger.
6.
If #1 CDM module is not sparking, disconnect the #2 CDM module and see if the #1 CDM module starts sparking. If it does, the CDM
module you just unplugged is bad. If it does not, reconnect #2, then disconnect the #3 CDM module and see if the #1 module starts
sparking. If it does, the module you just unplugged is bad.
7.
If there is no spark on either # 2 or #3, swap locations with #1 and see if the problem moves. If it does, the CDM module is bad. A
continued no spark on the same cylinder indicates a bad Trigger.
8.
If the cylinders are only misfiring above an idle, connect an inductive tachometer to all cylinders and try to isolate the problem cylinders.
9.
Check the resistance of each of the CDM modules.
NO SPARK OR INTERMITTENT SPARK ON ONE OR MORE CYLINDERS:
1.
Inspect the spark plug wires, boots and spark plugs. Check for chafing on the wiring and harnesses.
2.
Clean and inspect all CDM ground wire connections to engine ground.
3.
Check the Stator resistance and DVA as given below:
Read from
White/Green (Stator)
Purple (#1 Trigger)
White (#2 Trigger)
Brown (#3 Trigger)
Blue
(#4 Trigger)
Note: When moving CDM modules around on the engine, pay attention to the Stator wire colors going to the CDMs.
You must have a Green/White and White/Green wire connected or you will lose fire on all CDMs.
4.
If (#1 and #2) or (#3 and #4) is not sparking, swap the White/Green and Green/White Stator wires and retest. If the problem
moves to the other cylinders, the Stator is likely bad. If no change, replace all CDMs. A continued no spark condition on the
same cylinders indicates a bad Trigger.
5.
Disconnect the CDM modules one at a time and see if you get spark back on the problem cylinders. If spark returns, replace the CDM
module you disconnected.
6.
If the cylinders are only misfiring above an idle, connect an inductive RPM meter to all cylinders and try to isolate the problem cylinders.
7.
Check the resistance of each of the CDM modules.
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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.
3 CYLINDER CDM IGNITION TROUBLESHOOTING
OEM Ohms
CDI Ohms
500-700 Ω
400-550 Ω
Ohms
Open
Open
Open
4 CYLINDER CDM IGNITION TROUBLESHOOTING
Read to
Green/White (Stator)
Engine Gnd
Engine Gnd
Engine Gnd
Engine Gnd
CDI Electronics, LLC • 353 James Record Road SW • Huntsville, AL 35824 USA
www.cdielectronics.com
DVA (Connected)
180-400 V
DVA (Connected)
1 V Minimum
1 V Minimum
1 V Minimum
OEM Ohms
CDI Ohms
500-700 Ω
400-550 Ω
Open
Open
Open
Open
Open
Open
Open
Open
• Tech Support: 1-866-423-4832 • Order Parts: 1-800-467-3371
Page - 3 of 6
DVA (Disconnected)
200-400 V
DVA (Connected)
DVA (Disconnected)
180-400 V
1 V Minimum
1 V Minimum
1 V Minimum
1 V Minimum
200-400 V
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-
-
-
QF-358
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