Checking the supply
Check the power supply to combustion preheater module (CPM) terminal #9. Check for contact resistance and oxidation. Check for loose connections. Also check the fuse in the engine compartment. Voltage should be 12 V.
Check the cable between terminal #1 on the Ext-X relay (2/29) and terminal #15 on the combustion preheater module (CPM). Check for contact resistance and oxidation. Check for loose connections. Check the relay, the power supply to the relay and the passenger compartment fuse.
If no fault is found, the fault may have been intermittent.
Remedy as necessary.
Other information
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Refer to Verification