Page 747 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-61

P144,P145,P151,P2963-ENGINE COOLANT TEMPERATURE 1 04

SENSOR FAULT
P144 - ENGINE COOLANT TEMPERATURE 1 SENSOR
CIRCUIT-VOLTAGE IS ABOVE NORMAL OR SHORTED TO HIGH

VOLTAGE POWER SUPPLY
P145 - ENGINE COOLANT TEMPERATURE 1 SENSOR

CIRCUIT-VOLTAGE IS BELOW NORMAL OR SHORTED TO LOW
VOLTAGE POWER SUPPLY
P151 - ENGINE COOLANT TEMPERATURE - DATA IS VALID BUT

ABOVE NORMAL OPERATING RANGE - HIGHEST SEVERITY
LEVEL

P2963 -ENGINE COOLANT TEMPERATURE - DATA IS VALID BUT
ABOVE NORMAL OPERATING RANGE - LOWEST SEVERITY
LEVEL

Description

1 . The coolant temperature sensor, a variable resistor sensor, used to measure
the temperature of the engine coolant. ECM provides the 5V power to the coolant
temperature signal circuit. ECM monitors voltage changes due to sensor
resistance changes to determine coolant temperature. ECM will use engine
coolant temperature value for engine protection system and emission control.