Checking Components And Wiring
Check the cable between central electronic module (CEM) terminal #8 and the signal cable for the flame sensor. Check for a short-circuit to supply voltage. Check for an open-circuit.
HINT: It is difficult to differentiate between the ground lead for the flame sensor and the signal cable. Take readings on one cable at a time to check for a plausible value on either of them.
Replace the flame sensor if no fault is found in the cable.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see OVERHEAT PROTECTION THERMOSTAT / FLAME SENSOR / ENGINE COOLANT TEMPERATURE SENSOR, REPLACING
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION
Check the central electronic module (CEM) connector. Check for contact resistance and oxidation.
Check the flame sensor circuit. Check for an intermittent open-circuit.
Check the cable between central electronic module (CEM) terminal #8 and the signal terminal for the flame sensor. Check for an intermittent short-circuit to supply voltage.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see OVERHEAT PROTECTION THERMOSTAT / FLAME SENSOR / ENGINE COOLANT TEMPERATURE SENSOR, REPLACING
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION