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Symptom: *CHECKING THE LOW COOLANT LAMP OPERATION POSSIBLE CAUSES CHECK THE LOW COOLANT SWITCH POWERTRAIN CONTROL MODULE - CONTROL OPEN POWERTRAIN CONTROL MODULE - CONTROL SHORTED TO GROUND LOW COOLANT LAMP CONTROL SHORTED TO VOLTAGE LOW COOLANT SWITCH SIGNAL CIRCUIT OPEN LOW COOLANT SWITCH SIGNAL CIRCUIT SHORTED TO GROUND LOW COOLANT LAMP CONTROL CIRCUIT SHORTED TO GROUND LOW COOLANT SWITCH - OPEN LOW COOLANT SWITCH SIGNAL CIRCUIT SHORTED TO SWITCH GROUND LOW COOLANT LAMP CONTROL CIRCUIT OPEN LOW COOLANT SWITCH - INTERNAL SHORT POWERTRAIN CONTROL MODULE - SIGNAL OPEN LOW COOLANT LAMP BULB POWERTRAIN CONTROL MODULE - SIGNAL SHORT TO GROUND MESSAGE CENTER TEST ACTION APPLICABILITY 1 NOTE: Ensure the engine coolant is at the proper level before continuing. All Lamp on for 2 seconds, then off Lamp on continuously Lamp inoperative 2 Turn the ignition off. All Yes → The Low Coolant Lamp System is working properly. No → 192 DRIVEABILITY - DIESEL |