DTC P066A, P066C, P066E, or P067A
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DTC P066A, P066C, P066E, or P067A
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DTC P066A 00
Cylinder 1 Glow Plug Control Circuit Low Voltage
DTC P066C 00
Cylinder 2 Glow Plug Control Circuit Low Voltage
DTC P066E 00
Cylinder 3 Glow Plug Control Circuit Low Voltage
DTC P067A 00
Cylinder 4 Glow Plug Control Circuit Low Voltage
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Circuit/System Description
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This DTC applies to internal microprocessor integrity conditions within the glow plug control module.
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Conditions for Running the DTC
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The battery voltage is between 9-16 V.
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The DTC runs once per ignition cycle when the above condition is met.
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Conditions for Setting the DTC
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The ECM detects a glow plug control module malfunction.
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Action Taken When the DTC Sets
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DTCs P066A, P066C, P066E and P067A are Type A DTCs.
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Conditions for Clearing the DTC
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DTCs P066A, P066C, P066E and P067A are Type A 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 OFF, disconnect the harness connector at the K34 Glow Plug Control Module.
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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 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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Test for 0.3-1.0 Ω between each of the glow plug circuit terminals listed below and ground.
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Glow Plug 1 circuit terminal 3
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Glow Plug 2 circuit terminal 1
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Glow Plug 3 circuit terminal 4
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Glow Plug 4 circuit terminal 6
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5.
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If less than the specified range, test the glow plug circuit for a short to ground. If the circuit tests normal, replace the Glow Plug.
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6.
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If greater than the specified range, test the glow plug circuit for an open circuit. If the circuit tests normal, replace the Glow Plug.
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7.
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Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 4 and ground.
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8.
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If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
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9.
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If all circuits test normal, replace the K34 Glow Plug Control Module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
