DTC P037E or P037F (LPL or LPV)
Diagnostic Instructions
DTC Descriptors
| DTC P037E: Glow Plug Control Module Feedback
Circuit Low Voltage |
| DTC P037F: Glow Plug Control Module Feedback
Circuit High Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
B+
|
—
|
P0383
|
—
|
—
|
Ignition
|
P0383
|
P0383
|
P0384
|
—
|
Signal
|
P037E
|
P037E
|
P037F
|
—
|
Ground
|
—
|
—
|
—
|
—
|
|
| |
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
| • |
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
DTC P037E and P037F are Type C DTCs.
Conditions for Clearing the DTC
DTC P037E and P037F 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. DTC P037E or P037F 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
Note: First test the glow
plugs before you proceed with the 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 ground circuit terminal 3 and ground. |
| ⇒ |
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. |
Ignition OFF, connect a test
lamp between the signal circuit terminal 1 and earth. Ignition ON,
test the first 3 s for greater than 11 V between the signal circuit
terminal 1 and earth. |
| ⇒ |
If there is permanent voltage, test the signal
circuit for a short to voltage. |
| ⇒ |
If less than the specified range, test the signal
circuit for a short to ground or an open/high resistance. |
| 6. |
If the circuit tests normal,
replace the K34 Glow Plug Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
