Intermittent Fault

Check the control module connector and the electrical terminal for the glow plug. Check for loose connections. See LOOSE CONNECTIONS (TERMINALS) . Check for contact resistance and oxidation. See CONTACT RESISTANCE AND OXIDATION .

Check the cable between control module terminal #1 and the glow plug terminal. Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground. Check for an intermittent short-circuit to supply voltage.

Remedy as necessary.

Other information: 

• To access the control module or connect the breakout box, see CONNECTING THE BREAKOUT BOX
• To access the glow plug, see GLOW PLUG ENGINE COOLANT HEATER, REPLACING
• With the ignition on and the glow plug electrical terminal disconnected, the voltage between the glow plug electrical terminal (control module side) and ground must be approximately 9 V
• For other values, see SIGNAL SPECIFICATION
• see CHECKING WIRING AND TERMINALS .

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Glow Plug

Courtesy of VOLVO CARS CORPORATION

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  Refer to INFORMATION 

  OKAY:  Troubleshooting has been completed.