Land Rover Common Rail System Crs Denso Manual

Operation Section1–76
7.2 E-EGR System (Electric-Exhaust Gas Recirculation)
(1) General Description
• The E-EGR system is an electronically controlled EGR system. The EGR system recirculates a portion of the exhaust
gases into the intake manifold in order to lower the combustion chamber temperature and reduce NOx emissions.
However, operation of the EGR system may reduce engine power output and affect drivability. For this reason, in the
E-EGR system, the engine ECU controls the EGR to achieve an optimal...

Operation Section1–77
To Increase the EGR Quantity
- The E-VRV duty ratio is controlled
*1. In the stable condition shown in the bottom center diagram, an increase in the
current that is applied to the coil causes the attraction force FM in the coil to increase. When this force becomes
greater than the vacuum force FV that acts on the diaphragm, the moving core moves downward. Along with this
movement, the port from the vacuum pump to the upper chamber of the diaphragm opens. Consequently, the out-
put...

Operation Section1–78
7.3 Electronically Controlled Throttle (Not Made By DENSO)
(1) General Description
• The electronically controlled throttle is located upstream of the EGR valve in the intake manifold. It controls the throttle
valve at an optimal angle to regulate the EGR gas and reduce noise and harmful exhaust gases.
(2) Operation
• Signals from the engine ECU actuate the stepping motor, which regulates the throttle valve opening.
EGR Control
• To further increase the EGR volume when the EGR valve...

Operation Section1–79
7.4 Exhaust Gas Control System
(1) General Description
• The exhaust gas control system is provided to improve warm-up and heater performance. This system actuates the
exhaust gas control valve VSV, which is attached to the exhaust manifold. It increases the exhaust pressure to in-
crease the exhaust temperature and engine load, in order to improve warm-up and heater performance.
(2) Operation
• The exhaust gas control system operates when the warm-up switch is ON, and all the...

Operation Section1–80
7.5 DPF System (Diesel Particulate Filter)
(1) General Description
• This system reduces emissions of PM (particulate matter). In order to collect PM, a DPF cleaner with built-in catalytic
filter is mounted on the center pipe. The collected PM is handled with combustion processing during operation.
(2) System Configuration
(3) Various Sensors
Exhaust Gas Temperature Sensor
• The exhaust gas temperature sensor is installed to the front and rear of the DPF to detect the temperature in...

Operation Section1–81
Differential Pressure Sensor
• The differential pressure sensor detects the difference in pressure at the front and rear of the DPF, and outputs a sig-
nal to the engine ECU. The sensor portion is a semiconductor type pressure sensor that utilizes the piezoelectric ef-
fect through a silicon element, and amplifies and outputs the voltage with its IC circuit. When PM is collected and
accumulated in the DPF, the filter clogs and the difference in pressure at the front and rear of the...

Operation Section1–82
7.6 DPNR SYSTEM (DIESEL PARTICULATE NOx REDUCTION)
(1) General Description
• This system reduces the emissions of PM (particulate matter) and NOx. The DPNR catalyst mounted in the center
pipe collects and regenerates PM and reduces NOx all at the same time. The collected PM is handled with combus-
tion processing during operation.
(2) System Configuration
Q000911E
Supply PumpExhaust Gas Cleaning
Device SwitchExhaust Gas Cleaning
Device Display Lamp
Injector
DPNR Catalyst
Oxidation...

Operation Section1–83
8. DIAGNOSIS
8.1 Outline Of The Diagnostic Function
zThe diagnostic function enables a system to self-diagnose its own malfunctions. If abnormal conditions occur in the sen-
sors or actuators used in the control systems, the respective systems convert the malfunction signals into codes and
transmit them to the engine ECU. The engine ECU records the transmitted malfunction code into memory. Recorded
codes are output at the diagnostics connector on the vehicle. To inform the driver of...

Operation Section1–84
3)Checking the Freeze Frame Data: If the symptom that out-
puts a DTC cannot be duplicated, check the freeze frame
data.
4)Erasing DTCs from memory: Operate in accordance with
the instructions shown on the screen to display the DTC
check screen. Select Erase DTCs to erase the DTCs.
< NOTE >
If it is not possible to erase the DTC, turn the ignition
switch OFF, and repeat the process.
5)Wiring Harness and Connector Open Circuit Check
< NOTE >
If the DTC output during a diagnostic...

Operation Section1–85
Reading DTCs 1
• Turn the ignition switch ON and count the number of times the MIL (Malfunction Indicator Light) blinks
< NOTE >
• If the MIL (Malfunction Indicator Light) does not output a code (the light does not blink), there may be an open circuit in
the TC terminal system or a failure in the engine ECU.
• If the malfunction indicator light is constantly ON, there may be a short (pinching) in the wiring harness or a failure in
the engine ECU.
• If meaningless DTCs are output,...