brake MITSUBISHI MONTERO 2000 Service Repair Manual

GDI -Troubleshooting 13A-103
Inspection procedure 32
Stop lamp switch system
Probable cause
The engine-ECU determines whether the brakepedal is depressed or not, by means
of the stoplampswitch input signal.DMalfunction of the stoplampswitch
DOpen circuit or short-circuited harness wire in the stop
lampcircuit, or poor connector contact
DMalfunction of the engine-ECU
NG
NG
NG
Repair
Check the stoplampswitch. (Refer to GROUP 35 - Brake Pedal.)NG
Replace
OK
Measure at stoplampswitch connector D-136.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 2 and earth
OK:
System voltageNG
OK
Check trouble symptom.
Check the harness wire between the battery and stoplampswitch.
NG
Repair
OK
Measure at engine-ECU connector D-117.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 63 and earth
(Ignition switch: ON)
OK:
0 - 3 V (when the brakepedal is not depressed)
System voltage (when the brakepedal is depressed)NG
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and stoplamp,
and repair if necessary.
OK
Check the following connector:
D-117NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
Check the following connectors:
D-26 , D-27, D-124

Check the following connectors:
D-26 , D-124 ,
D-128, E-13


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GDI -Troubleshooting 13A-105
DATA LIST REFERENCE TABLE
Caution
When shifting the select lever to D range, the brakes should be applied so that the vehicle does
not move forward.
NOTE
*
1: Within four minutes after starting the engine
*2: In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10%
longer than the standard time.
*
3: The accelerator pedal position switch normally turns off when the voltage of the accelerator pedal
position sensor (1st channel) is 200 - 600 mV higher than the voltage at the idle position. If the
accelerator pedal position switch turns back on after the accelerator pedal position sensor voltage
has risen by 100 mV and the throttle valve has opened, the accelerator pedal position switch and
the accelerator pedal position sensor (1st channel) need to be adjusted.
Item
No.Check itemsRequirementsNormal conditionInspection
procedure
No.Reference
page
11Oxygen sen-Engine: AfterIdling200 mV or lessK
1Code No.13A-28
sor
(front)warm-up
Sudden racing600 - 1,000 mV
P0130
2,500 r/min400 mV or less and
600 - 1,000 mV
alternates.
12Air flow sensorD
Engine coolant
temperature:Idling22 - 48 HzCode No.
P010013A-17
80 - 95_
C
D
Lamps, electric
cooling fan and2,500 r/min60 - 100 Hz
cooling fan and
all accessories:
OFF
D
Transmission:
Neutral
RacingFrequency in-
creases in re-
sponse to racing.
13Intake air tem-
perature sen-Ignition switch: ONIntake air tempera-
ture: - 20_
C-20_
CCode No.
P011013A-21
sor
Intake air tempera-
ture: 0_
C0_
C
Intake air tempera-
ture: 20_
C20_
C
Intake air tempera-
ture: 40_
C40_
C
Intake air tempera-
ture: 80_
C80_
C


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GDI -Troubleshooting 13A-108
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
41Injector drive
time *2DEngine coolant
temperature:
80 - 95_CIdling0.3 - 0.8 ms*1--
80 - 95_C
DLamps, electric
cooling fan and
all accessories:
2,500 r/min0.4 - 1.0 ms
all accessories:
OFF
DTransmission:
Neutral
Sudden racingIncreases
44Ignition
advanceDEngine: After
warm-upIdling5-20_BTDC *1Code No.
P030013A-53
advancewarm-up
DSet a timing
light.
2,500 r/min15 - 35_BTDC
P0300
49A/C relayEngine: After
warm-up, idlingA/C switch: OFFOFF (compressor
clutch is not oper-
ating)Procedure
No.3113A-102
A/C switch: ONON (compressor
clutch is operating)
59Oxygen sen-
sor (rear)DTransmission:
2nd gear
DDrive with
throttle widely
open3,500 r/min600 - 1,000 mVCode No.
P013613A-31
67Stop lamp
switchIgnition switch: ONBrake pedal: De-
pressedOFFProcedure
No.3213A-103
Brake pedal: Re-
leasedON
68EGR valveDEngine coolant
temperature:
80 - 95_C
DLamps, electricIdling2 - 20 STEPCode No.
P040313A-60
cooling fan and
all accessories:
OFF
DTransmission:
Neutral
2,500 r/min0 - 10 STEP
74Fuel pressure
sensorDEngine coolant
temperature:
80 - 95_C
DLamps, electric
cooling fan and
all accessories:
OFF
DTransmission:
NeutralEngine: Idling4 - 6.9 MPaCode No.
P019013A-36


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GDI -Troubleshooting 13A-114
Terminal
No.Normal condition Check requirements (engine condition) Check item
63Stop lamp switchDepress the brake pedal.System voltage
Release the brake pedal.0-3V
65A/C switch (2nd channel)Refer to GROUP 55 - Troubleshooting “Check at the A/C-ECU
terminal, engine-ECU output terminals.”
66Clutch switchDepress the clutch pedal.0-3V
Release the clutch pedal.System voltage
68Ignition switch-STEngine: Cranking8V or more
71Oxygen sensor (front)Engine: Warm up, and then hold the
engine speed at 2,500r/min (Use a
digital voltmeter).0«0.8 V alternates.
76Air flow sensor reset signalEngine: Idling0-1V
Engine: 3,000 r/min6-9V
78Throttle position sensor
(2nd channel)Ignition switch:
ONRelease the
accelerator pedal.4.5 - 5.5 V
Depress the
accelerator pedal
fully.0.4 - 0.6 V
79Accelerator pedal position
switchIgnition switch:
ONRelease the
accelerator pedal.0-1V
Depress the
accelerator pedal
fully.4V or more
80Vehicle speed sensorDIgnition switch: ON
DMove the vehicle forward.0«system voltage
alternates.
83A/C switch (1st channel)Engine: IdlingA/C switch: OFF0-3V
A/C switch: ON
(Compressor is
operating)System voltage
88Small lamp switchLighting switch: OFF0-3V
Lighting switch: ON (Taillamp: ON)System voltage
89Oxygen sensor heaterEngine: Idling0-3V
(front)
Engine: 3,500 r/minSystem voltage
90Oxygen sensor heaterEngine: Idling0-3V
(rear)
Engine: 3,500 r/minSystem voltage
92Fuel pressure sensorEngine: Idling0.3 - 4.7 V


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GDI -Troubleshooting 13A-195
Inspection procedure 32
Stop lamp switch system
Probable cause
The engine-A/T-ECU determines whether the brakepedal is depressed or not.
The engine-A/T-ECU selects a fuel injectionmode by determining thebrake
operation according to this information.DMalfunction of the stoplampswitch
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-A/T-ECU
NG
Check the following connectors:
D-26 , D-27, D-124 NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connector:
D-122NG
Repair
Stoplampswitch check (Refer to
GROUP 35 - Brake Pedal.)NG
Replace
OK
Measure at stoplampswitch
connector D-136.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 2
and earth
OK
System voltageOKMeasure at the engine-A/T-ECU
connector D-122.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 123
and earth
(Ignition switch: ON)
OK
0 - 3 V (when the brake
pedal is not depressed)
System voltage (when the
brakepedal is depressed)NG
NG
Repair OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-A/T-ECU and the stoplamp
switch, and repair if necessary.
NG
Check the harness wire between the
battery and the stoplampswitch,
and repair if necessary.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
Check the following connectors:
D-26 , D-33, D-128, D-136,
D-124 , E-13
Inspection procedure 33
Small lamp switch system
Probable cause
The engine-A/T-ECU determines whether the smalllampswitch is on or off.
According to that information, the engine-A/T-ECU controls alternator output
current when the vehicle is started.DImproper connector contact,opencircuit or
short-circuited harness wire in thetaillamprelay
circuit.
DMalfunction of the engine-A/T-ECU
OK
Check the following connector:
D-121NGReplace
Measure at engine-A/T-ECU connector D-121.
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminal 86 and earth (Lighting
switch: ON)
OK:
System voltageNGCheck thetaillampcircuit. (Refer to ELECTRICAL WIRING.)
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.


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GDI -Troubleshooting 13A-198
DATA LIST REFERENCE TABLE
Caution
When shifting the select lever to D range, the brakes should be applied so that the vehicle does
not move forward.
NOTE
*1: Injector running time indicates the time where the power voltage is 11 V and the cranking speed
is 250 r/min or less. As the engine speed increases and the time passes by, the injector running
time decreases.
*2: There may be occasions of taking the injector running time approximately 10% longer than usual
when a vehicle has not been driven for a long time (mileage is no more than 500 km.)
*3: It is normal that the idle switch turns from ON to OFF when accelerator pedal position sensor (1st
channel) voltage increases by 200 - 600 mV from the idling position. Moreover, adjust the idle switch
and accelerator pedal position sesor if the idle switch keeps turning after the accelerator pedal is
depressed.
Item
No.Inspection
itemInspection contentsNormal conditionInspection
procedure
No.Reference
page
11Oxygen
sensorEngine: After having
warmed up
(Air/fuel mixture is
made leaner whenWhen at 4,000 r/min,
engine is deceler-
ated200 mV or lessCode No.
1113A-131
made leaner when
decelerating, and is
made richer when
racing.)
Race the engine sud-
denly.600 - 1,000 mV
Engine: After having
warmed up
(The oxygen sensor
signal is used to
check the air/fuelIdling
(after six minutes)400 mV or less
600 - 1,000 mV
(changes)
check the air/fuel
mixture ratio, and
control condition by
the engine-
A/T-ECU.)
2,500 r/min
12Air flow sen-DEngine coolantIdling22 - 48 HzCode No.13A-133
sortemperature: 80 -
95
_C
Lamps and all
2,500 r/min60 - 100 Hz
12
DLamps and all
accessories: OFF
DTransmission: P
range
RacingFrequency in-
creases in re-
sponse to racing
13Intake air
temperatureIgnition switch: ON or
with engine runningWhen intake air tem-
perature is - 20_
C-20_
CCode No.
1313A-135
sensor
When intake air tem-
perature is 0_
C0_
C
When intake air is
20_
C20_
C
When intake air is
40_
C40_
C


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GDI -Troubleshooting 13A-201
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
41Injector
drive time*1D
Engine: CrankingWhen engine coolant
temperature is 0_
C120 - 160 msCode No.
4113A-147
When engine coolant
temperature is 20_
C70 - 90 ms
When engine coolant
temperature is 80_
C20 - 35 ms
Injector
drive time*2D
Engine coolant
temperature: 85 -
95_
CIdling0.3 - 0.8 ms
95_
C
D
Lamps and all
accessories: OFF
D
Transmission:
2,500 r/min0.4 - 1.0 ms
D
Transmission:
P range
D
Within six minutes
after engine start-
ing
When engine is sud-
denly racedIncreases
44Ignition ad-
vance valueD
Engine: After hav-
ing warmed up
D
Timing lamp is set.
(The timing lamp is
set in order toIdling12 - 28_
BTDCCode No.
4413A-148
set in order to
check actual igni-
tion timing.)
D
Within six minutes
after engine start-
ing
2,500 r/min15 - 35_
BTDC
49A/C relayEngine: After having
warmed up, idlingA/C switch: OFFOFF (compressor
clutch is not oper-
ating)Procedure
No.3113A-194
A/C switch: ONON (compressor
clutch is operat-
ing)
67Stop lamp
switchIgnition switch: ONBrake pedal: De-
pressedOFFProcedure
No.3213A-195
Brake pedal: Re-
leasedON
68EGR valveD
Engine coolant
temperature: 85 -
95_
CIdling2 - 20 STEPProcedure
No.3513A-196
D
Lamps and all
accessories: OFF
D
Transmission: P
range
2,500 r/min0 - 10 STEP
74Fuel pres-
sure sensorD
Engine coolant
temperature: 85 -
95_
CEngine: Cranking2 MPa or moreCode No.
5613A-151
D
Lamps and all
accessories: OFF
D
Transmission: P
range
Engine: Idling4.0 - 6.9 MPa


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GDI -Troubleshooting 13A-207
Terminal
No.Normal condition Check condition (Engine condition) Check item
78Throttle position sen-
sor (2nd channel)Ignition switch: ONRelease the accelerator
pedal.4.0 V or higher
Depress the accelerator
pedal fully.0.4 - 0.6 V
79Accelerator pedal posi-
tion switchIgnition switch: ONRelease the accelerator
pedal.0-1V
Depress the accelerator
pedal slightly.4 V or more
80Vehicle speed sensorDIgnition switch: ON
DMove the vehicle slowly forwardVoltages of 0 and 8 - 12
V alternate (changes
repeatedly)
83A/C switch 1Engine: IdlingA/C switch: OFF0-3V
A/C switch: ON (Com-
pressor is operating)System voltage
86Small lamp switchLighting switch: OFF0-3V
Lighting switch: Tail light positionSystem voltage
87Sensor applied voltageIgnition switch: ON4.5 - 5.5 V
93Fuel pressure sensorEngine: Idling0.3 - 4.7 V
95Accelerator pedal posi-
tion sensor (1st chan-Ignition switch: ONRelease the accelerator
pedal.0.985 - 1.085 V
nel)
Depress the accelerator
pedal fully.4.0 V or higher
98Ignition switch-IGIgnition switch: ONSystem voltage
123Stop lamp switchDepress the brake pedal.System voltage
Release the brake pedal.0-3V


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DIESEL FUEL <4M4> -Troubleshooting13C-40
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
36Selector switch be-
tween A/T and M/TIgnition switch: ON0-1V
37Inhibitor switchIgnition switch: ON
(Engine stops)Set the selector lever to P
or N0-1V
Set the selector lever to D,
2, L, or RSystem voltage
39Stop lamp switchDepress the brake pedalSystem voltage
40Brake switchDepress the brake pedal0-1V
46Control relayIgnition switch: ON0-1V
Ignition switch: ON®OFF (in about 8 seconds)System voltage
51Engine speed sensor
(backup)Engine: Idling1.5 - 2.5 V
55Accelerator pedal posi-
tion sensor (sub)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position4.1 V or higher
71Ignition switch-STEngine: Cranking8 V or higher
74Control sleeve positionIgnition switch: ON (Engine stops)2.2 - 2.7 V
73sensor2.0 - 4.0 V
752.0 - 4.0 V
76Timer piston positionIgnition switch: ON (Engine stops)2.2 - 2.7 V
77sensor2.0 - 4.0 V
782.0 - 4.0 V
80Back-up power supplyIgnition switch: OFFSystem voltage
82Ignition switch-IGIgnition switch: ONSystem voltage
83Engine coolant tem-
perature sensorIgnition switch: ONEngine coolant tempera-
ture: 0_C3.4 - 4.5 V
Engine coolant tempera-
ture: 20_C2.6 - 3.6 V
Engine coolant tempera-
ture: 40_C1.8 - 2.5 V
Engine coolant tempera-
ture: 80_C0.7 - 1.1 V
84Accelerator pedal posi-
tion sensor (main)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position4.1 V or higher
85Boost pressure sensorIgnition switch: ON (760 mmHg)1.2 - 1.6 V
86Vehicle speed sensorDIgnition switch: ON
DMove the vehicle forward slowly0V«5 V (repeat the
change)


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-48
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
88Boost air temperature
sensorIgnition switch: ONIntake air temperature:
0_C3.2 - 3.8 V
Intake air temperature:
20_C2.3 - 2.9 V
Intake air temperature:
40_C1.4 - 2.0 V
Intake air temperature:
80_C0.4 - 1.0 V
89Crank angle sensorEngine: Idling (Use a digital voltage meter to check.)0V↔5V
(repeat the change)
90EGR valve position
sensor
Engine: After warm-
inguptheengine
Idling under no load2.3 - 3.3 V
sensoring up the engineEngine is suddenly racedMomentarily drops from
voltage during idling
91Parking switchIgnition switch: ON
(Enginestops)
Parking brake: ON0-1V
(Engine stops)Parking brake: OFFSystem voltage
CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS
1. Turn the ignition switch to LOCK (OFF) position.
2. Disconnect the engine-ECU connector.
3. Measure the resistance and check for continuity between
the terminals of the engine-ECU harness-side connector
while referring to the check chart.
NOTE
(1) When measuring resistance and checking continuity,
a harness for checking contact pin pressure should
be used instead of inserting a test probe.
(2) Checking need not be carried out in the order given
in the chart.
Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
4. If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5. After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.


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