Pinpoint Test B : Pinpoint Test
WARNING: This page is about a different variant/trim than selected.
- B1 CARRY OUT INSPECTION AND VERIFICATION
- Carry out the Inspection and Verification procedure.
Are any concerns present?
Yes REPAIR as needed. No GO to B2 - B2 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DTCS
- Ignition ON.
- Using a scan tool, perform PCM self-test.
Is DTC P0217 present?
Yes GO to B3 No Actual engine overheating has not been verified. CHECK the engine coolant temperature gauge operation. Refer to: Instrumentation, Message Center and Warning Chimes . If any other PCM DTCs are retrieved, REFER to: Electronic Engine Controls . - B3 REVIEW THE PCM (POWERTRAIN CONTROL MODULE) DTCS
- Check for DTC P26B7 or P26BD.
Is DTC P26B7 or P26BD present?
Yes For DTC P26B7 GO to Pinpoint Test D For DTC P26BD GO to Pinpoint Test E No GO to B4 - B4 CHECK FOR AN AIRFLOW OBSTRUCTION
- Check the radiator or A/C condenser for an external obstruction such as leaves or cardboard.
Is an obstruction present?
Yes REMOVE the obstruction. No GO to B5 - B5 CHECK THE ELECTRIC COOLING FAN OPERATION
- Start the engine.
- Place the climate control function selector in the MAX A/C position and the blower motor switch in the HI position.
Did the electric cooling fan operate?
Yes GO to B6 No DIAGNOSE the electric cooling fan operation. Refer to Engine Controls - Symptom Charts (Except Diesel & Hybrid) . - B6 CHECK THE ENGINE COOLANT LEVEL AND PRESSURE TEST THE COOLING SYSTEM
- Ignition OFF.
- Visually check the engine coolant level in the coolant expansion tank and adjust as necessary. Pressure test the cooling system.
Does the engine cooling system leak externally?
Yes REPAIR or INSTALL new components. No GO to B7 - B7 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK
- Inspect the engine coolant in the coolant expansion tank for signs of engine oil.
Is engine oil evident in the coolant?
Yes REFER to: Engine . No GO to B8 - B8 CHECK THE ENGINE OIL FOR COOLANT
- Remove the oil level indicator from the engine.
Is coolant evident in the oil?
Yes REFER to: Engine . No GO to B9 - B9 CHECK THE COOLING SYSTEM FOR COMBUSTION GASESNOTE: Use UView ® Combustion Leak Tester part number UVU560000-R or equivalent.
- Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases.
Are combustion gases present?
Yes REFER to: Engine . No GO to B10 - B10 CHECK COOLANT CONDITION
- Check the coolant for dirt, rust or contamination and check the coolant concentration.
Is the coolant condition OK?
Yes GO to B11 No FLUSH the engine cooling system. - B11 CHECK THE COOLANT SHUTOFF SOLENOID FOR BEING STUCK CLOSED
- Start the engine.
- Allow the engine to reach operating temperature.
- Visually inspect for coolant flow in the degas bottle.
Is coolant flow present?
Yes GO to B12 No INSTALL a new coolant shutoff solenoid. Refer to: Coolant Shutoff Solenoid Valve . Fill and bleed the cooling system. REFER to: Cooling System Draining, Vacuum Filling and Bleeding . Repeat the pinpoint test step. If there is still no flow in the degas bottle check for blockage in the coolant hoses, heater core, or engine oil cooler. If no blockage is present install a new coolant pump. REFER to: Coolant Pump . - B12 CHECK THE COOLANT BYPASS SOLENOID VALVE FOR BEING STUCK CLOSED
- Start the engine or road test to duplicate the overheat condition.
- Feel the bypass coolant hose between the coolant bypass solenoid valve at the rear of the cylinder head and the thermostat housing.
Is the bypass hose cool to the touch?
Yes INSTALL a new coolant bypass solenoid valve. Refer to: Coolant Bypass Solenoid Valve . No GO to B13 - B13 VISUALLY INSPECT THE THERMOSTAT
- Carry out the Thermostat Visual Inspection.
Is the thermostat damaged?
Yes INSTALL a new thermostat. Refer to: Thermostat . No INSTALL a new thermostat. Refer to: Thermostat . If the engine still overheats, INSTALL a new radiator. REFER to: Radiator .