DTC P0506 or P0507 (LUJ)
Diagnostic Instructions
DTC Descriptors
| DTC P0506 00: Idle Speed Low |
| DTC P0507 00: Idle Speed High |
Circuit/System Description
The throttle actuator control (TAC) motor is controlled by the
engine control module (ECM). The DC motor located in the throttle
body drives the throttle blade. In order to decrease idle speed,
along with spark and fuel delivery changes the ECM commands the
throttle closed reducing air flow into the engine and the idle
speed decreases. In order to increase idle speed, the ECM commands
the throttle plate open allowing more air to pass the throttle
plate.
Conditions for Running the DTC
| • |
DTCs P0107 00, P0108 00, P0117
00, P0118 00, P0120 00, P0122 00, P0123 00, P0128 00, P0171 00,
P0172 00, P0201 00, P0202 00, P0203 00, P0204 00, P0222 00, P0223
00, P0300 00, P0496 00, P0601 00, P0604 00, P0606 00, P061A 00,
P0641 00, P2101 00, P2119 00, P2122 00, P2123 00, P2127 00, P2128
00, P2138 00, or P2176 00 are not set. |
| • |
The engine has been running
for greater than 60 s. |
| • |
The engine is idling for
greater than 10 s. |
| • |
The intake air temperature
(IAT) is greater than -40°C (-40°F). |
| • |
The transmission gear selector
state has not changed. |
| • |
The engine coolant temperature
(ECT) is greater than 50°C (122°F). |
| • |
The system voltage is between
9-18 V. |
| • |
The vehicle speed is less than
4.8 km/h (3 MPH). |
| • |
DTCs P0506 00 or P0507 00 run
continuously when the above conditions are met. |
Conditions for Setting the DTC
P0506 00
| • |
The ECM detects that the
actual idle speed is continuously approximately 100 RPM lower than
the desired idle speed. |
| • |
The above condition is present
for 15 s. |
P0507 00
| • |
The ECM detects that the
actual idle speed is approximately 200 RPM higher than desired idle
speed. |
| • |
The above condition is present
for 15 s. |
Action Taken When the DTC Sets
DTC P0506 00 and P0507 00 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0506 00 and P0507 00 are Type B DTCs.
Diagnostic Aids
| • |
A stalling condition can cause
DTC P0506 00 to set. |
| • |
An intermittent vehicle speed
sensor (VSS) signal can cause DTC P0507 00 to set. |
| • |
An intermittent clutch pedal
position sensor signal, if equipped, can cause DTC P0506 00 to
set. |
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
|
Note: The engine must
first be running for greater than 60 s, then idle at a steady state
for an additional 10 s before comparing the actual and desired
engine idle speed parameters.
|
| 1. |
Using a scan tool compare the
Desired Idle Speed parameter to the actual Engine Speed
parameter. |
| |
• |
Actual engine speed should not
be less than 100 RPM below desired. |
| |
• |
Actual engine speed should not
be greater than 200 RPM above desired. |
| 2. |
Verify that there are no other
DTCs set. |
| 3. |
Operate the vehicle within the
conditions for running the DTC. You may also operate the vehicle
within the conditions that you observed from the freeze
frame/failure records data. |
Circuit/System Testing
| 1. |
Inspect for any condition that
can reduce idle speed by increasing engine load. |
| |
• |
Incorrect torque converter
clutch (TCC) operation |
| |
• |
Accessories that require
additional torque to operate |
| |
• |
More deposits than the
customer may desire in the Q38 Throttle Body |
| |
• |
Mechanical conditions that
limit engine speed |
| |
• |
Repair any conditions, if
necessary. |
| 2. |
Inspect for the following
conditions: |
| |
• |
A faulty positive crankcase
ventilation valve |
| |
• |
Repair any conditions, if
necessary. |
Repair Verification
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Throttle Body Inspection and Cleaning
|
