Note On Intermittents

Manipulate circuit No. 410 wiring, ECT sensor connector and PCM connector while observing PCM Data PD04. If engine coolant temperature jumps from normal reading to 298°F (148°C) or greater, repair intermittent short to ground on circuit No. 410. Remove and reconnect both ECT sensor and PCM connectors and retest before replacing any components. If wiring and connectors are okay, substitute a known good ECT sensor and retest.

Fig 1: Code P014 Schematic, Shorted Engine Coolant Temperature (ECT) Sensor

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P014 Diagnostic Flow Chart, Shorted ECT Sensor

Courtesy of GENERAL MOTORS CORP.