DTC P0380, P0383, or P0384
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DTC P0380, P0383, or P0384
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DTC P0380 00
Glow Plug Feedback Circuit Malfunction
DTC P0383 02
Glow Plug Feedback Circuit Low Voltage
DTC P0384 00
Glow Plug Feedback Circuit High Voltage
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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B+
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P0380 00
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P0380 00
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P0380 00
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P0380 00
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Ignition
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P0380 00
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P0380 00
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P0380 00
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P0380 00
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Signal
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P0383 02
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P0383 02
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P0384 00
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P0380 00
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Ground
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-
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-
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-
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P0380 00
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Circuit/System Description
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The glow plug controller is a solid state device which operates the glow plugs. The temperature and the power consumption is controlled between the engine control module (ECM) and the glow plug controller within a wide range to suit the engines pre-heating requirements. The ECM controls the glow plug module with a pulse-width modulated (PWM) control circuit. The glow plug initial ON time will vary based on the system voltage and temperature. Lower temperatures cause longer ON times.
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Conditions for Running the DTC
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P0380 00
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•
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The ignition voltage is between 9-16 V.
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•
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The DTCs run once per ignition cycle when the above conditions are met.
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P0383 02 or P0384 00
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•
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The ignition voltage is between 9-16 V.
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•
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The DTCs run once per ignition cycle when the above conditions are met.
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Conditions for Setting the DTC
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The ECM detects an open, short to ground, or a short to voltage on the glow plug module control circuit for greater than 0.5 s.
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Action Taken When the DTC Sets
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DTC P0380, P0383 and P0384 are Type C DTCs.
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Conditions for Clearing the DTC
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DTC P0380, P0383 and P0384 are Type C DTCs.
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTCs P0380, P0383 or P0384 should not set.
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2.
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Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Ignition OFF, disconnect the harness connector X1 at the K34 Glow Plug Control Module.
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2.
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Test for less than 5 Ω between the ground circuit terminal 3 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Connect a test lamp between the B+ circuit terminal 5 and ground.
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5.
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If the test lamp is OFF, test the B+ circuit for a short to ground or an open/high resistance.
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6.
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Ignition ON, connect a test lamp between the ignition circuit terminal 4 and ground.
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7.
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If the test lamp is OFF, test the ignition circuit for a short to ground or an open/high resistance.
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8.
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Test for 9.5-10.5 V between the signal circuit terminal 1 and ground.
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9.
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If greater than the specified range, test the signal circuit for a short to voltage.
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10.
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If less than the specified range, test the signal circuit for short to ground or an open/high resistance.
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11.
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If the circuit tests normal, replace the K34 Glow Plug Control Module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
