engine coolant MITSUBISHI MONTERO 2000 Service Owner's Guide

GDI -Troubleshooting 13A-109
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
77Accelerator
pedal positionIgnition switch: ONRelease the accel-
erator pedal.985 - 1085 mVCode
No.P122513A-68
sensor (2nd
channel)
Depress the accel-
erator pedal gradu-
ally.Increases in re-
sponse to the ped-
al depression
stroke.
Depress the accel-
erator pedal fully.4,000 mV or more
78Accelerator
pedal positionIgnition switch: ONRelease the accel-
erator pedal.985 - 1085 mVCode
No.P022013A-50
sensor (1st
channel) *3Depress the accel-
erator pedal gradu-
ally.Increases in re-
sponse to pedal
depression stroke.
Depress the accel-
erator pedal fully.4,200 - 4,800 mV
79Throttle posi-
tion sensorDEngine coolant
temperature:Release the accel-
erator pedal.400 - 800 mVCode
No.012013A-25
(1st channel)80 - 95_C
DIgnition switch:
ON (Engine
stopped)
Depress the accel-
erator pedal gradu-
ally.Increases in re-
sponse to pedal
depression stroke.
4,600 - 5,200 mV4,200 - 4,800 mV
Engine: AfterNo load450 - 1,000 mV
warm-up, idling
A/C switch: OFF®
ONIncreases by 100 -
600 mV.
99Fuel injection
modeEngine: After warm
upIdling (after four
minutes or more
have passed since
engine start)Lean compression--
2,500 r/minStoichiometric
metric feedback
Sudden racing after
idle positionOpen loop


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GDI -Troubleshooting 13A-112
Terminal
No.Normal condition Check requirements (engine condition) Check item
16Purge control solenoid valveDEngine cool-Engine: stoppedSystem voltage
ant tempera-
ture:
80 - 95_C
DIgnition
switch: ON
Engine: Start the
engine, and then
increase engine
speed up to 3,500
r/min.Voltage decreases.
18Condenser fan relayCondenser fan is not operating.System voltage
Condenser fan is operating.0-3V
20Fuel pump relayIgnition switch:Engine: stoppedSystem voltage
ON
Engine: idling0-3V
21A/C relayDEngine: idlingSystem voltage, or changes
DA/C switch: OFF®ON
(Compressor is operating)from momentarily 6 V or
more to 0®3V
31Engine warning lampIgnition switch: OFF®ON0-3V®System voltage
(after several seconds)
41Sensor power supplyIgnition switch: ON4.5 - 5.5 V
42Power supply to accelerator
pedal position sensor (1st
channel)Ignition switch: ON4.5 - 5.5 V
43Crank angle sensorEngine: Cranking0.4 - 4.0 V
Engine: Idling1.5 - 2.5 V
44Engine coolant temperature
sensorIgnition switch:
ONEngine coolant
temperature: 0_C3.2 - 3.5 V
Engine coolant
temperature:
20_C2.3 - 2.9 V
Engine coolant
temperature:
40_C1.5 - 2.1 V
Engine coolant
temperature:
80_C0.4 - 1.0 V
45Engine ignition signalEngine: 3,000 r/min0.3 - 3.0 V


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GDI -Troubleshooting 13A-128
FAIL-SAFE FUNCTION REFERENCE TABLE
When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled
by means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning itemControl contents during malfunction
Air flow sensor1. Suspends lean burn operation.
2. Uses the throttle position sensor signal and engine speed signal (crank angle
sensor signal) to take reading of the basic injector drive time and basic ignition
timing from the pre - set mapping.
Intake air temperature sensorControls as if the intake air temperature is 25_
C.
Throttle position sensor (2nd
channel)1. Suspends lean burn operation.
2. Controls the throttle opening angle feedback (half as much as the opening
rate in the normal condition) by using signals from the throttle position sensor
(1st channel). However, this controlling system is not applied if the throttle
position sensor (1st channel) and throttle position sensor (2nd channel)
combination output voltage is outside 4 - 6 V.
3. Refrains from controlling the throttle opening angle feedback if the throttle
position sensor (1st channel) is also defective.
Engine coolant temperature
sensorControls as if the engine coolant temperature is 80_
C. (Moreover, the control system
is working until the ignition switch is turned OFF if the sensor signal returns to normal.)
Camshaft position sensorCuts the fuel supply once a malfunction is detected. (Only when there has been
no occasion of detecting No.1 cylinder top dead centre after the ignition switch
is turned ON.)
Vehicle speed sensor1. Suspends lean burn operation. However, the control is cancelled as a certain
time passes by with the engine speed of 1,500 r/min or more.
2. Suspends lean burn operation during the engine idling.
Barometric pressure sensorControls as if the barometric pressure is 101 kPa.
Detonation sensorFixes the ignition timing as that for regular gasoline.
Injector1. Suspends lean burn operation.
2. Suspends the exhaust gas recirculation.
Ignition coil (incorporating pow-
er transistor)1. Suspends lean burn operation.
2. Cuts off the fuel supply to cylinders with an abnormal ignition signal.
Fuel pressure sensor1. Controls as if the fuel pressure is 5MPa.
2. Suspends fuel injection. (when the low pressure is detected and the engine
speed is more than 3,000r/min)
Alternator FR terminalRefrains from controlling to suppress the alternator output to electrical load.
(Operated as a normal alternator)
Accelerator pedal position sen-
sor (2nd channel)1. Suspends lean burn operation.
2. Controls the throttle valve position by using signals from the accelerator pedal
position sensor (1st channel). (However, the control system is not applicable
if the difference from the accelerator pedal position sensor (1st channel) output
voltage is 1.0V or higher.)
3
. Suspends the electronic controlled throttle valve system if accelerator pedal
position sensor (1st channel) is also defective.


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GDI -Troubleshooting 13A-130
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference page
11Oxygen sensor system13A-131
12Air flow sensor system13A-133
13Intake air temperature sensor system13A-135
14Throttle position sensor (2nd channel) system13A-137
21Engine coolant temperature sensor system13A-138
22Crank angle sensor system13A-140
23Camshaft position sensor system13A-142
24Vehicle speed sensor system13A-144
25Barometric pressure sensor system13A-145
31Detonation sensor system13A-146
41Injector system13A-147
44Ignition coil (incorporating power transistor) system (for No. 1 and No. 4 cylinders)13A-148
52Ignition coil (incorporating power transistor) system (for No. 2 and No. 5 cylinders)13A-148
53Ignition coil (incorporating power transistor) system (for No. 3 and No. 6 cylinders)13A-148
54Immobilizer system13A-150
56Abnormal fuel pressure system13A-151
64Alternator FR terminal system13A-153
77Accelerator pedal position sensor (2nd channel) system13A-154
78Accelerator pedal position sensor (1st channel) system13A-156
79Throttle position sensor (1st channel) system13A-158
89Abnormality in fuel pressure system13A-160
91Electronic-controlled throttle valve system13A-161
92Throttle valve position feedback system13A-162
93Throttle valve control servo system13A-163
94Communication line system with throttle valve controller13A-164
96Throttle valve controller system13A-165
NOTE
Code No. 56 may be also output when air is sucked in high-pressure fuel line due to no fuel supply.


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GDI -Troubleshooting 13A-131
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No.11 Oxygen sensor systemProbable cause
Range of Check
DThree minutes havebeenpassed since theengine has been started.
DThe engine coolant temperature is approx. 80_C or more.
DIntake air temperature is 20 - 30_C
DEngine speed is 1,200 r/min or more
DDriving on a level surface at constant speed.
Set Conditions
DThe oxygen sensor output voltage is 4.5 V or more when the sensor output
voltage is 0.2 V or less and a voltage of 5 V isapplied to theoxygen
sensor inside the engine-A/T-ECU.DMalfunction of oxygen sensor
DOpen or short circuit in the oxygen sensor circuit
or loose connector contact
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting 13A-138
OK
Measure at throttle valve controller
connector D-121.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DVoltage between terminal 7 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.4 - 0.8 V
Acceleratorpedalfully de-
pressed: 4.2 - 4.8 VNGCheck the following connector:
D-121NG
Repair
OK
Check the harness wire between the
the throttle position sensor (2nd
channel) and the throttle valve
controller, and repair if necessary.
OK
Check the following connector:
D-121
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
From the previouspage
NG
Repair
OK
Measure at throttle position sensor
connector B-102.
DUse test harness (MB991536) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
(1) Voltage between terminal 1 and
earth
OK:
4.8 - 5.2 V
(2) Voltage between terminal 3 and
earth
OK:
0.5 V or less
(3) Voltage between terminal 4 and
earth
OK:
Acceleratorpedalfully re-
leased: 4.0 V or more
Acceleratorpedalfully de-
pressed: 0.4 - 0.6 V(1) NGCheck the following connector:
D-11NG
Repair
(2) NG
OK
Check the harness wire between the
the throttle position sensor (2nd
channel) and the throttle valve
controller, and repair if necessary.
(3) NG
Adjust the throttle position sensor.
(Refer to P.13A-220.)
Check the following connector:
D-121NG
Repair
OK
Check the harness wire between the
the throttle position sensor (2nd
channel) and the throttle valve
controller, and repair if necessary.
Code No.21 Engine coolant temperature sensor systemProbable cause
Range of Check
DEngine: Two seconds after theengine has beenstarted
Set Conditions
DThe sensor output voltage is 4.6 V or more for four seconds (equivalent to
-45_C of engine coolant temperature)
or
DThe sensor output voltage is 0.1 V or less for four seconds (equivalent to
140_C of engine coolant temperature)DMalfunction of engine coolant temperaturesensor
DOpen or short circuit in theengine coolant
temperature sensor circuit or loose connector
contact
DMalfunction of engine-A/T-ECU
Range of Check
DEngine: After starting
Set Conditions
DThe engine coolant temperature has reduced fromover 40_C to less than
40_C, and that condition has lasted for five minutes or more.


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GDI -Troubleshooting 13A-139
OK
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU.
MUT-
IIData list
21 Engine coolant temperature
sensor
OK:
When the engine iscold,
the temperature is roughly
the same asambient tem-
perature. If warm, it is 80 -
120_C.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
Replace
OK
Measure at engine coolant
temperature sensor connector B-56.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Resistance between terminal 2
and earth
OK:
2Wor less(1) NGMeasure at engine-ECU connector
D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect connector B-56.
DIgnition switch: ON
DVoltage between terminal 44 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-120
NG
Repair
NG
NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the following connector:
B-56NG
Repair
(2) NG
OKRepair
OK
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU.NG
Repair
NG
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
To the nextpage
Measure at engine coolant
temperature sensor connector B-56.
DDisconnect the connector and
measure at the harness side.
DResistance between terminals 1
and 2
OK:
At 20_C of engine coolant
temperature: 2.1 - 2.7 kW
At 80_C of engine coolant
temperature: 0.26 - 0.36
kW
Check the following connector:
D-120
Check the following connector:
D-121


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GDI -Troubleshooting 13A-140
OK
Measure at engine coolant
temperature sensor connector B-56.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DVoltage between terminal 1 and
earth
OK:
At 0_C of engine coolant
temperature: 3.2 - 3.8 V
At 20_C of engine coolant
temperature: 2.3 - 2.9 V
At 40_C of engine coolant
temperature: 1.3 - 1.9 V
At 80_C of engine coolant
temperature: 0.3 - 0.9 VNGCheck theengine coolant
temperature sensor.
(Refer to P.13A-227.)NG
Repair
OK
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU, and repair
if necessary.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the following connectors:
D-120, D-121NG
Repair
From the previouspage
Code No.22 Crank angle sensor systemProbable cause
Range of Check
DEngine is cranking
Set Conditions
DSensor output voltage does not change for 4 seconds (no pulse signal input).DMalfunction of the crankanglesensor.
DOpen or short circuit in the crankanglesensor
circuit or loose connector contact.
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting 13A-160
Code No.89 Abnormal fuel systemProbable cause
Range of Check
DEngine: Being learning the air - fuel ratio
Set Conditions
DTen seconds or more havebeenpassed while the fuel injection amount
compensation value is too low.
or
DTen seconds or more havebeenpassed while the fuel injection amount
compensation value is too high.DMalfunction of fuel supply system
DMalfunction of oxygen sensor
DMalfunction of intake air temperature sensor
DMalfunction of barometric pressure sensor
DMalfunction of air flow sensor
DMalfunction of engine-A/T-ECU
Repair
OK
MUT-
IIData list
74 Fuel pressure sensor (Refer to
13A-198, DATA LIST
REFERENCE TABLE.)NGCheck fuel leakage around the fuel
pump (high-pressure) line.NG
NO
Check the air intake from the intake
hose and right bank intake manifold.NG
Repair
OK
Check the oxygen sensor (Refer to
P.13A-230.)NG
Replace
MUT-
IISelf-Diag Code
Is any diagnosis code other than
No.89 output?YESRefer to P.13A-130, INSPECTION
CHART FOR DIAGNOSIS CODES.
OK
Check the exhaust gas leaks from
the right bank exhaust manifold.NG
Cleaning
OK
Check the throttle body (around the
throttle valve), and clean if
necessary. (Refer to P.13A-220).NG
Cleaning
OK
MUT-
IIData list
11 Oxygen sensor
12 Air flow sensor
13 Intake air temperature sensor
21 Engine coolant temperature
sensor
25 Barometric pressure sensor
(Refer to 13A-198, DATA LIST
REFERENCE TABLE.)
Reference
If all the service data is normal, go
to “OK.”
If any abnormal service is found, go
to “NG.”NGRefer to the Inspection procedure for
the sensor, which is indicated by the
abnormal service data.
(Refer to P.13A-130, INSPECTION
CHART FOR DIAGNOSIS CODES.)OK
Replace the fuel pump
(high-pressure).
Check the purge control solenoid
valve (Refer to GROUP 17 -
Emission Control).NG
Replace
OK
To the nextpage


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GDI -Troubleshooting 13A-171
Inspection procedure 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a sparkplug is
defective, or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.DMalfunction of the fuel supply system
DMalfunction of the ignition system
DMalfunction of the engine-A/T-ECU
NGRepair
OK
MUT-
IIData list
22 Crankanglesensor (Refer to P.13A-198.)NGCheck the crankanglesensor system.
(Refer to P.13A-140, code No.22.)
YES
MUT-
IIActuator Test
07 Fuel pump(low pressure) (Refer to P.13A-203.)NGCheck fuelpump(low pressure) system
(Refer to P.13A-193, Inspection procedure 29.)
OK
Does the camshaft rotate when theengine is cranking?NOCheck if thetiming belt isbroken ordamaged.
NO
MUT-
IIData list
16 Battery voltage (Refer to P.13A-198.)NGCheck theengine controlrelay and ignition switch-IG system
(Refer to P.13A-190, Inspection procedure 25.)
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES
Check battery voltage when cranking.
OK:
8 V or higherNGCheck the battery.
OK
Is starting good if the engine iscranked with the accelerator
pedalslightly depressed?YESDClean the throttle valve area. (Refer to P.13A-220.)
DCheck and adjust the throttle position sensor (Refer to
P.13A-220.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle position sensor (1st channel) system
(Refer to P.13A-158, code No.79.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system
(Refer to P.13A-138, code No.21.)
OK
Measure low fuel pressure between the fuelpump(low
pressure) and fuelpump (highpressure) (Refer to P.13A-222.)NGRepair
OK
To the nextpage
NO
Adjust the throttle position sensor (Refer to P.13A-220.)
NG
Measure at injector driver connector B-19
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminals 4, 12, 21 and earth
(Ignition switch: ON)
OK
Battery voltage
Check fuel leakage (Refer to P.13A-225.)OK
Check the injector driver system.
(Refer to P.13A-196, Inspection procedure 34.) NG


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