Notes On Intermittents

Manipulate Coolant sensor wiring, Coolant sensor connector, and PCM connector while observing PCM Data ED04. If the coolant temperature jumps from a normal reading to -38°C or less, repair the intermittent open circuit on CKT 410 or 1076. Remove and reconnect both the Coolant and PCM connectors and retest before replacing any components. If wiring and connectors check out OK, substitute a known good coolant sensor and retest.