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The duty–cycle is determined by the ECM from inputs it receives from the fuel injector sensor and TACHOMETER—PCM OUTPUT DESCRIPTION The PCM recieves engine rpm values from the ECM controller, and then supplies engine rpm values GLOW PLUG RELAY—ECM OUTPUT DESCRIPTION When the ignition (key) switch is placed in the ON position, a signal is sent to the ECM relating current After receiving this signal, the ECM will determine if, when and for how long a period the glow plug With a cold engine, the glow plug relay and glow plugs may be activated for a maximum time of 200 In this chart, Pre–Heat and Post–Heat times are mentioned. Pre–heat is the amount of time the glow GLOW PLUGS DESCRIPTION Glow plugs are used to help start a cold or cool engine. The plug will heat up and glow to heat the Each plug will momentarily draw approximately 25 amps of electrical current during the initial key–on Fig. 13 Glow Plug Relay Location 1 – MOUNTING BOLT GLOW PLUG CONTROL ENGINE COOLANT TEMP- ERATURE KEY ON WAIT-TO- START LAMP ON (SECONDS) PRE-HEAT CYCLE (GLOW ON) (SECONDS) POST- HEAT CYCLE (SECONDS) -30 C 15 SEC. 45 SEC. 200 SEC. -10 C 8 SEC. 35 SEC. 180 SEC. +10 C 6 SEC. 25 SEC. 118 SEC. +30 C 5 SEC. 20 SEC. 70 SEC. +40 C 4 SEC. 16 SEC. 60 SEC. +70 C 3 SEC. 16 SEC. 20 SEC. Fig. 14 Glow Plug 1 – GLOW PLUG 14 - 30 FUEL SYSTEM—2.5L DIESEL ENGINE XJ DESCRIPTION AND OPERATION (Continued) 2000 JEEP CHEROKEE |