Checking Components And Wiring

Check the cable between control module terminal #8 and the signal cable for the flame sensor. Check for a short-circuit to ground.

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 relevant value on either of them. 

Replace the flame sensor if no fault is found in the cable.

Remedy as necessary.

Other information: 

• To access the control module or connect the breakout box, see CONNECTING THE BREAKOUT BOX
• To access or replace the flame sensor, see OVERHEAT PROTECTION THERMOSTAT / FLAME SENSOR / ENGINE COOLANT TEMPERATURE SENSOR, REPLACING
• For other values, see SIGNAL SPECIFICATION .

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Flame Sensor

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION