2000 MITSUBISHI MONTERO Service Repair Manual

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-15
Code No. 21 Crank angle sensor systemProbable cause
Range of Check
DEngine cranking
Set Conditions
DSensor output voltage does not change for 2 seconds (no pulse signal input)DMalfunction of crank angle sensor
DOpen circuit or short-circuit in crank angle sensor
circuit, or poor connector contact
DEngine-ECU inoperative
Range of Check
DIgnition switch: ON
DNot during the engine cranking
DPump speed sensor circuit: Normal
Set Conditions
DWhen crank angle sensor signal is being input normally, suddenly no sensor
signal is input for 0.3 seconds or more
OK
Check the harness between the
crank angle sensor and the engine
control relay, and repair if necessary.
OKNG(1) NGMeasure at crank angle sensor
connector B-52.
DConnect the connector.
(Test harness: MB998478 used)
DVoltage between 2 (black clip)
and the earth
OK:0.4 - 4.0 V
(Engine: cranking)
1.5 - 2.5 V
(Engine: idling)
NG
Replace the crank angle sensor.
Replace the engine-ECU.
OKRepair
Check the following connector:
D-113
NG
OK
Repair NG
Check the harness between the
engine-ECU and the crank angle
sensor.NG
Check the trouble symptoms.
Replace the engine-ECU.
Check the harness between the
crank angle sensor and the earth,
and repair if necessary. OKRepair NG
Check the following connector:
B-52
Check the trouble symptoms.
Measure at crank angle sensor
connector B-52.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between 3 and the earth
(Ignition switch: ON)
OK:System voltage
(2) Continuity between 2 and the
earth (Ignition switch: ON)
OK:4.6 - 5.4 V
(3) Continuity between 1 and the
earth
OK:Continuity(2) NG
(3) NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-16
Code No. 23 Idle switch (accelerator pedal position
sensor built-in) systemProbable cause
Range of Check
Ignition switch: ON, accelerator pedal position sensor (main, sub) operative,
except for during engine cranking
Set Conditions
DIdle switch (built-in): ON for 0.8 second, accelerator pedal position sensor
(main, sub) output voltage 1.875 V or higher
DIdle switch (built-in): OFF for 10 minutes, accelerator pedal position sensor
(main, sub) opening degrees less than 1.17 %DAccelerator pedal position sensor inoperative
DAccelerator pedal position sensor open circuit,
short circuit, or connector contact inoperative
DIdle switch “ON” inoperative
DIdle switch signal line short circuit
DEngine-ECU inoperative
OK
Measure at D-135 accelerator pedal position
sensor connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 4 and the earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 5 and the earth
OK:ContinuityNGCheck the following connectors:
D-111, D-112NG
Repair
OK
OKRepair
NGIdle switch check (Refer to P.13E-58.)
Check the trouble symptoms.
Replace the engine-ECU.NG
Replace the engine-ECU.OKNG
OK
Check the following connector:D-135Replace
NG
Check the trouble symptoms.
Check the harness between the
engine-ECU and the accelerator pedal
position sensor connector.
NG
Repair


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-17
Code No. 25 Timer piston position sensor systemProbable cause
Range of Check
DIgnition switch: OK
DNot during the engine cranking
Set Conditions
DThe sensor output voltage for 1 second is 4.9 V* or more
or
DThe sensor output voltage for 1 second is 0.25 V* or lessDTimer piston position sensor inoperative
DTimer piston position sensor open circuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
NOTE:
*: This voltage is derived from the input pulse signal converted in the engine-ECU and cannot be measured.
Replace injection pump assembly (timer
piston fully closed/opened position
inoperative, etc.)
NG
NG
OK
OK
NG
Check the following connector:D-113NG
Repair
OK
Repair
NGTimer piston position sensor check
(Refer to P.13E-62.)
NG
NG OK
NG
Check the trouble symptoms.
Replace injection pump assembly.
Check the following connector:B-39
OK
Replace the engine-ECU.NGMUT-IIData list
19 Injection timing (command value)
(Refer to P.13E-41.)
OK
Check the trouble symptoms.
Check the trouble symptoms.
Check the harness between the
engine-ECU and the timer piston sensor
connector.
MUT-IIData list
18 Actual injection timing (Refer to
P.13E-41.)Replace the engine-ECU.


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-18
Code No. 26 Control sleeve position sensor systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DThe sensor output voltage for 0.3 second is 4.5 V* or more
or
DThe sensor output voltage for 0.3 second is 0.25 V* or lessDControl sleeve position sensor inoperative
DControl sleeve position sensor open circuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
NOTE:
*: This voltage is derived from the input pulse signal converted in the engine-ECU and cannot be measured.
OK
NG
Check the following connector:D-113NG
Repair
OK
Repair
NGControl sleeve position sensor check (Refer
to P.13E-62.)
NG
NG OK
NG
Check the trouble symptoms.
Replace injection pump assembly.
Check the following connector:B-38
OK
Replace the engine-ECU.NGMUT-IIData list
17 Control sleeve position sensor (target
value) (Refer to P.13E-41.)
OK
Check the trouble symptoms.
Replace injection pump assembly.
Check the trouble symptoms.
NG
NG
Check the harness between the
engine-ECU and the injection pump
assembly connector.
MUT-IIData list
23 Control sleeve position sensor (actual
value) (Refer to P.13E-41.)Replace the engine-ECU. OK


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-19
Code No. 27 Accelerator pedal position sensor (sub)
systemProbable cause
Range of Check
DIgnition switch: ON, accelerator pedal position sensor (main) operative, except
for during engine cranking
Set Conditions
DAccelerator pedal position sensor output voltage for 1 second
Sub side: 0.2 V or higher, lower than 2.5 V
Main side: 4.5 V or higher
or
Sub or main: Lower than 0.2 V
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DThe difference in the output sensor voltage between the main and the sub
sensor is 1 V or higher, or the idle switch ON, and sensor main output
voltage is 1.875 V or higher.DAccelerator pedal position sensor inoperative
DAccelerator pedal position sensor open circuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
Measure at D-135 accelerator pedal position
sensor connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 8 and the earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 7 and the earth
OK:ContinuityNGNG
Repair
OK
OKRepair
NGAccelerator pedal position sensor check
(Refer to P.13E-57.)
NG
Replace the engine-ECU.OKNG
OK
Replace
NG
Check the trouble symptoms.
NG
RepairCheck the following connector:D-135
Check the harness between the
engine-ECU and the accelerator pedal
position sensor connector.
Check the trouble symptoms.
Replace the engine-ECU.
Check the following connector:
D-112


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-20
Code No. 41 Throttle solenoid valve systemProbable cause
Range of Check
DIgnition switch: OFF
DBarometric pressure is 95.4 kPa or over (equivalent to an altitude of 500 m).
Set Conditions
DBoost pressure sensor output does not change.DThrottle solenoid valve inoperative
DThrottle solenoid valve open circuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
DMalfunction of throttle actuator
Check and repair the harness between the
engine-ECU and the solenoid valve
connector.
NG
OK
Check the trouble symptoms.
OK
Check and repair the harness between the
control relay and the solenoid valve
connector. NG
OKMeasure at B-62 throttle solenoid valve
connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 2 and the earth
(Ignition switch: ON)
OK:System voltage
OK
Replace
Throttle actuator check
(Refer to P.13E-63.)NG
OK
Throttle solenoid valve check
(Refer to P.13E-62.)
Replace the engine-ECU. OK
RepairCheck the following connector:D-110
Check the trouble symptoms.NGReplace NG
Check the following connector:
B-62NG
RepairNGMeasure at D-110 engine-ECU connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 14 and the earth
(Ignition switch: ON)
OK:System voltage
NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-21
Code No. 43 Timing control valve systemProbable cause
Range of Check
DEngine coolant temperature 80_C or higher and the engine running
Set Conditions
DTarget value minus actual value is 0.64 V or more for 5 secondsDTiming control valve inoperative
DTiming control valve open circuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
DBlockage in fuel system
OK
OK
Check and repair the harness between the
control relay and the injection pump
assembly connector.
Timing control valve check
(Refer to P.13E-61.)
Replace the engine-ECU. OK
RepairCheck the following connector:D-110
Check the trouble symptoms.NG NG NG
Check the following connector:B-38NG
Repair
OK
Check the trouble symptoms.
NG
NGMeasure at D-110 engine-ECU connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 3 and the earth
(Ignition switch: ON)
OK:11 V or higherOK
Measure at B-38 injection pump assembly
connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 5 and the earth
(Ignition switch: ON)
OK:System voltage
Replace injection pump assembly.
Check and repair the harness between the
engine-ECU and the injection pump
assembly connector.
Fuel system blockage check
DFuel filter blocked
DFuel hose blocked or bent
DFuel tank filter blockedOK
Replace NG
NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-22
Code No. 46 Injection volume adjusting ROM systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DWhen communication failsDInjection volume adjusting ROM inoperative
DEngine-ECU inoperative
Repair
OK
Replace the engine-ECU. OK
RepairCheck the following connector:B-37
Check the trouble symptoms.NG NG
Check the following connector:D-112
NG
Repair OK
Check the trouble symptoms.
NG
Measure at B-37 injection volume adjusting
ROM connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 3 and the earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 4 and the earth
OK:Continuity
Check the harness between the
engine-ECU and the injection volume
adjusting ROM connector.
OK
Replace the engine-ECU.NG
NG
RepairCheck the harness between the
engine-ECU and the injection volume
adjusting ROM connector.
OK
Check the trouble symptoms.
NG
Replace injection pump assembly.


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