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IGNITION CONTROL TABLE OF CONTENTS page page IGNITION CONTROL . . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . . . . . . . . . . . . 1 GLOW PLUG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 1 GLOW PLUG RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 DIAGNOSIS AND TESTING - GLOW PLUG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 IGNITION CONTROL OPERATION - GLOW PLUG Pre - Glowing With the key in the On position, the glow plug out- put stage and the indicator lamp are actuated by the Glow Output Stage With the ignition key in the On position a signal is transmitted from the ECM to the glow plug output • Open circuit in one or more of the glow plug leads • Short circuit in the glow plug circuit • Out put stage fault or temperature related shut- off If a failure in the glow plug system occurs, the glow plug indicator lamp will be illuminated only as After Glow Once the engine has started, the ECM determines the after glow time depending on cooling tempera- exhaust after a cold start up and a more stable cold If no signal is received from the coolant tempera- ture sensor the signal from the oil sensor is used as a SPECIAL TOOLS GLOW PLUG REMOVAL (1) Disconnect the negative battery cable. glow plug wiring harness connector(s) at the glow (4) Remove the glow plug(s) (Fig. 1). INSTALLATION (1) Screw glow plug(s) into cylinder head and tighten to 12 N·m (115 lbs. in) (Fig. 1). (2) Connect the glow plug wiring harness connec- tor(s) (3) Install the engine cover. GLOW PLUG RELAY DESCRIPTION The glow plug relay supplies battery voltage to the glow plug through a timed cycle that is related to GLOW PLUG PLIERS VA IGNITION CONTROL 8I - 1 |