Diagnostic Aids

After engine is started, coolant temperature should rise steadily to about 203°F (95°C) and stabilize when thermostat opens.

Codes 14, 23 and 32 set at the same time could be a result of an open in Light Green/Black sensor ground wire.

When replacing ECT sensor, check TEMPERATURE TO RESISTANCE VALUES table at various temperature levels to evaluate the possibility of a "shifted" (mis-scaled) sensor. A "shifted" sensor could result in driveability complaints.

Fig 1: CODE 14 - Schematic (Standard Emissions) Engine Coolant Temperature Sensor, Low Temperature Indicated

Fig 2: CODE 14 - Flow Chart (Standard Emissions) Engine Coolant Temperature Sensor, Low Temperature Indicated