Land Rover Common Rail System Crs Denso Manual

Repair Section2–106
(4) Connector connection fault verification method
• Simultaneously perform the data monitor and connector voltage measurements.
Q002334E
1. Read the Coolant Temperature Output Voltage value using the DST-2 data monitor.
2. Measure the voltage directly from the corresponding ECU terminal. Ex.) Coolant temperature sensor
If 1 is unsatisfactory and 2 is satisfactory, the connector connection is judged as faulty.
Since some malfunctions only occur intermittently, measure voltage while...

Repair Section2–107
5. TROUBLESHOOTING
5.1 Troubleshooting According to Malfunction Symptom (for TOYOTA Ve-
hicles)
(1) Malfunction Indicator Lamp (MIL) is lit.
Clogged air cleaner element
(2) The engine is hard to start.
Clogged air cleaner element
Description
The check engine warning light is lit when the engine is running, or before the engine is started.
Possible Cause
The DTC is recorded in the engine ECU.
1 Connect the DST-2 and read the DTC. Inspect the check engine warning light circuit....

Repair Section2–108
3 Verify the output waveform of the cylinder rec-
ognition sensor. (Refer to the cylinder recogni-
tion sensor check procedure issued by the
vehicle manufacturer.)Repair or replace the cylinder recognition sen-
sor and/or the corresponding circuit.
4 Check each injector. (Refer to the injector check
procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre-
sponding circuit.
5 Verify whether there is a start signal when
cranking the engine by...

Repair Section2–109
(3) The engine stalls when idling.
Clogged air cleaner element
Description
The engine stalls after starting or when idling.
Possible Cause
• Crankshaft position sensor
• Engine ECU power supply circuit
• Injector
• Supply pump
• Engine cooling system
• Start signal circuit
1 Verify that the engine is not overheated. Repair the engine cooling system.
2 Check the crankshaft position sensor output
waveform. (Refer to the crankshaft position sen-
sor check procedure issued by the vehicle...

Repair Section2–11 0
(4) The engine cranks normally, but does not start.
Clogged air cleaner element
Description
The engine is cranked at the normal speed, but does not start.
Possible Cause
• Crankshaft position sensor
• Engine ECU power supply circuit
• Injector
• Supply pump
• Start signal circuit
1 Use the DST-2 to verify whether the coolant
temperature is at the glow system operating
temperature. In addition, verify whether battery
voltage is being supplied to the glow plugs at
the designated...

Repair Section2–111
(5) Idle instability following engine start
Clogged air cleaner element
Description
Idle speed after starting the engine is abnormal.
Possible Cause
• Injector
• Supply pump
• Fuel filter
• Engine ECU
• Rail pressure sensor
1 Check each injector. (Refer to the injector check
procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre-
sponding circuit.
2 Check the fuel filter. Replace the fuel filter.
3 Check the supply pump and the supply pump
drive...

Repair Section2–11 2
(6) The engine returns to idle speed too slowly, or does not return at all.
Clogged air cleaner element
Description
The time required for the engine to return to idle speed is longer than normal, or the engine does not return to idle
speed.
Possible Cause
• Accelerator position sensor
• Injector
• Supply pump
1 Perform the accelerator pedal position sensor
function check. (Refer to the accelerator posi-
tion pedal sensor check procedure issued by
the vehicle manufacturer.)Repair or...

Repair Section2–11 3
(7) Rough idle
Clogged air cleaner element
Description
Idle speed fluctuates, causing the engine to vibrate.
Possible Cause
• Engine cooling system
• Crankshaft position sensor
• Engine
• Supply pump
• Injector
1 Check parts that may be a source of abnormal
engine vibration.Repair the engine.
2 Check each injector. (Refer to the injector check
procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre-
sponding circuit.
3 Verify that the engine is...

Repair Section2–11 4
(8) The engine stalls when decelerating.
Clogged air cleaner element
Description
The engine suddenly stops when decelerating.
Possible Cause
• Engine cooling system
• Crankshaft position sensor
• Engine ECU power supply circuit
• Supply pump
• Injector
• Start signal circuit
1 Verify that the engine is not overheated. Repair the engine cooling system.
2 Check the crankshaft position sensor. (Refer to
the crankshaft position sensor check procedure
issued by the vehicle...

Repair Section2–11 5
(9) Poor engine output, poor acceleration
Clogged air cleaner element
Description
Deficient engine performance.
Possible Cause
• EGR system
• Injector
• Mass Air Flow (MAF) meter
• Crankshaft position sensor
• Accelerator position sensor
• Boost pressure sensor
• Supply pump
• Start signal circuit
• Air cleaner, duct
1 Check for air cleaner clogging and/or damage. Replace the air cleaner or repair the air duct.
2 Verify that the engine is not overheated. Repair the engine cooling...