Control module, glow plug (596)
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Control module, glow plug (596)
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Control module with relay output.
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Pin No.
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Signal type
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Description
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1
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Output
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Connected to glow plug cylinder 1 and 2.
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2
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Output
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Connected to glow plug cylinder 3 and 4.
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3
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Power supply +30
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Connected to fuse holder 746a.
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6
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Ground
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Connected to grounding point G2.
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7
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Signal
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Connected to ECM pin 93(B).
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8
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Diagnostics
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Connected to ECM pin 52(B).
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9
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Power supply
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Via main relay 229. Connects to UEC pin 15(M).
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The control module has an internal diagnostic function which monitors the glow plugs. When a fault arises the glow plug control module sends an error message to control module pin 52(B).
When the engine control module pulls pin 93(B) to ground, the glow plug control module is activated, meaning pins 1 and 2 of the control module are supplied voltage.
When voltage on pin 3 (B+) exceeds 12 V, such as when the engine has been started, the control module begins alternately supplying power to pins 1 and 2. Alternation between pins 1 and 2 is done with 5 Hz. The power supply is pulsed alternately to lower power consumption.
