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Symptom: *CHECKING THE GLOW PLUG LAMP OPERATION POSSIBLE CAUSES GLOW PLUG LAMP BULB INSTRUMENT CLUSTER - LAMP NEVER ON INSTRUMENT CLUSTER - LAMP ON CONTINUOUSLY ENGINE CONTROL MODULE - FAILS TO ACTIVATE LAMP ENGINE CONTROL MODULE - LAMP ON CONTINUOUSLY GLOW PLUG LAMP CONTROL CIRCUIT SHORTED TO VOLTAGE GLOW PLUG LAMP CONTROL CIRCUIT OPEN GLOW PLUG LAMP CONTROL CIRCUIT SHORTED TO GROUND POWERTRAIN CONTROL MODULE - CONTROL OPEN POWERTRAIN CONTROL MODULE - INTERNAL FAULT TEST ACTION APPLICABILITY 1 Turn the ignition on and observe the Glow Plug Lamp. All Yes → No → 2 Turn the ignition off. All Yes → No → Replace and program the Engine Control Module in accordance 3 Turn the ignition off. All Yes → No → Repair the Glow Plug Lamp Control circuit for a short to ground. 252 DRIVEABILITY - DIESEL |