Pinpoint Test C: Pinpoint Test

WARNING: This page is about a different variant/trim than selected.

WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

C1 CARRY OUT INSPECTION AND VERIFICATION
- Carry out the INSPECTION AND VERIFICATION .
Were any concerns found?
- Yes : REPAIR as needed.
- No : GO to C2
C2 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) P0125 OR P0128
- Ignition ON.
- Using a scan tool, perform the PCM self-test.
Is DTC P0125 or P0128 present?
- Yes : GO to C3
- No : The cooling system is operational. If an inoperative temperature gauge is suspected, CHECK the temperature gauge operation.
  REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES .
  
  If an inoperative climate control system is suspected, CHECK the climate control system operation. For EATC
  
  REFER to: CLIMATE CONTROL SYSTEM - VEHICLES WITH: ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) .
  
  For Electronic Manual Temperature control (EMTC) REFER to: CLIMATE CONTROL SYSTEM - VEHICLES WITH: ELECTRONIC MANUAL TEMPERATURE CONTROL (EMTC) .
  
  If any other Diagnostic Trouble Codes (DTCs) are retrieved, REFER to: ELECTRONIC ENGINE CONTROLS .
C3 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 C4
C4 CHECK THE COOLANT LEVEL
NOTE: Allow the engine to cool before checking the coolant expansion tank.
- Visually check the engine coolant level in the coolant expansion tank
Is the engine coolant level within specification?
- Yes : GO to C5
- No : GO to PINPOINT TEST A
C5 CHECK THE COOLANT BYPASS SOLENOID VALVE FOR BEING STUCK OPEN
- Start the engine.
- Allow engine to idle and reach operating temperature (if cold).
- Feel the coolant hose between the coolant bypass solenoid valve and the thermostat housing.
Is the coolant hose hot?
- Yes : INSTALL a new coolant bypass solenoid valve.
  REFER to: COOLANT BYPASS SOLENOID VALVE .
- No : GO to C6
C6 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR OPERATION
- Using a scan tool, view PCM PID s.
- Monitor the ECT temperature PID .
- Using an Infrared temperature gun measure and record the temperature of the coolant outlet housing at the rear of the cylinder head near the ECT sensor.
Is the temperature reading similar to the ECT PID value?
- Yes : INSTALL a new thermostat.
  REFER to: THERMOSTAT .
- No : INSTALL a new ECT sensor.
  REFER to: ENGINE COOLANT TEMPERATURE (ECT) SENSOR .