DTC P0383 or P0384 (LPL or LPV)
Diagnostic Instructions
DTC Descriptors
| DTC P0383: Glow Plug Control Module Control
Circuit Low Voltage |
| DTC P0384: Glow Plug Control Module Control
Circuit High Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
B+
|
-
|
P0383
|
-
|
-
|
Ignition
|
P0383
|
P0383
|
-
|
-
|
Control
|
P0383
|
P0383
|
P0384
|
-
|
Ground
|
-
|
P0383
|
-
|
-
|
|
| |
Circuit/System Description
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.
Conditions for Running the DTC
P0383 or P0384
| • |
The ignition voltage is
between 9-16 V. |
| • |
The DTCs run once per ignition
cycle when the above conditions are met. |
Conditions for Setting the DTC
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.
Action Taken When the DTC Sets
DTCs P0383 and P0384 are Type C DTCs.
Conditions for Clearing the DTC
DTCs P0383 and P0384 are Type C DTCs.
Reference Information
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
Circuit/System Verification
| 1. |
Ignition ON, observe the DTC
information with a scan tool. DTCs P0380, P0383 or P0384 should not
set. |
| 2. |
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. |
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector X1 at the K34 Glow Plug Control Module.
|
| 2. |
Test for less than 5 Ω
between the earth circuit terminal 3 and earth. |
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
| 3. |
Connect a test lamp between
the B+ circuit terminal 5 and ground. |
| ⇒ |
If the test lamp is OFF, test the B+ circuit for a
short to ground or an open/high resistance. |
| 4. |
Ignition ON, connect a test
lamp between the ignition circuit terminal 4 and ground.
|
| ⇒ |
If the test lamp is OFF, test the ignition circuit
for a short to ground or an open/high resistance. |
| 5. |
Disconnect the X1 harness
connector at the K20 Engine Control Module. |
| 6. |
Ignition ON, test for less
than 0.3 V between the signal circuit at the harness connector from
K34 Glow Plug Control Module terminal 2 and ground. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to Voltage. If the circuit tests normal,
replace the K20 Engine Control Module. |
| 7. |
Ignition OFF, test for greater
than 500 kΩ between the signal circuit at the harness
connector from K34 Glow Plug Control Module terminal 2 and
earth. |
| ⇒ |
If less than the specified range, test the signal
circuit for a short to ground. If the circuit tests normal, replace
the K20 Engine Control Module. |
| 8. |
Test for less than 5 Ω
between the signal circuit at the harness connector from K34 Glow
Plug Control Module terminal 2 and the signal circuit at the K20
Engine Control Module terminal 33. |
| ⇒ |
If greater than the specified range, test the
signal circuit for an open circuit. If the circuit tests normal,
replace the K20 Engine Control Module. |
| 9. |
If the circuit tests normal,
replace the K34 Glow Plug Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
