2000 MITSUBISHI MONTERO transmission speed sensor

GDI -Troubleshooting 13A-61
Code No.P0420 Catalyst malfunctionProbable cause
Range of Check
DThe enginespeed is 3,000 r/min or less.
DDuring driving
DDuring air/fuel ratio feedback control
Set Conditions
DThe ratio between the oxygen sensor (rear) and the oxygen sensor (front)
output frequencies reaches 0.8 per 12 seconds on average.DMalfunction of catalyst
DMalfunction of the oxygen sensor (front)
DMalfunction of the oxygen sensor (rear)
DMalfunction of engine-ECU
Check the trouble symptoms.
Check the exhaust manifold. (Are there anycracks?)NG
OK
MUT-
IIData list
59 Oxygen sensor (rear)
DTransmission: 2nd
DDrive with wideopen throttle
OK:
600 - 1,000 mVNGCheck the oxygen sensor (rear) system
(Refer to P.13A-31, INSPECTIONPROCEDURE FOR
DIAGNOSTIC TROUBLE CODE P0136.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
DTransmission: 2nd
OK:
Changeover between 0 - 400 mV and 600 - 1,000
mV occur 15 times in 10 seconds.
OK
Replace the oxygen sensor (rear).
NG
Replace the catalytic converter.
Check the trouble symptoms.
NG
Replace the engine-ECU.
MUT-
IIData list
11 Oxygen sensor (front)
OK:
600 - 1,000 mV when racing suddenly
OK
NGRepair
Check the oxygen sensor (front) system
(Refer to P.13A-28, INSPECTIONPROCEDURE FOR
DIAGNOSTIC TROUBLE CODE P0130.)
Replace the oxygen sensor (front). NG


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GDI -Troubleshooting 13A-81
Inspection procedure 7
Unstable idling (rough idle, hunting)
Probable cause
This malfunction is probably caused by a faulty ignition system, improper air/fuel ratio,
a faulty electronic-controlled throttle valve system, improper compression pressure,
etc. As many causes can be suspected, diagnose from easier items.DMalfunction of the ignition system
DMalfunction of the air/fuel ratio control system
DMalfunction of the electronic-control throttle valve
system
DImproper compression pressure
DAir sucking into the air intake system
Has the batterybeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye sRefer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Does theengine idlespeed fluctuates excessively (excessivehunt-
ing)?Ye sClean around the throttle valve. (Refer to P.13A-220.)
No
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle valve position feedback system. (Refer to
P.13A-65, code No. P1221.)
OK
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-110.)NGCheck the acceleratorpedal positionswitch system. (Refer to
P.13A-100, Inspection procedure 28.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-105.)NGCheck the intake air temperature sensor system. (Refer to P.13A-21,
code No. P0110.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-105.)NGCheck the barometric pressure sensor system. (Refer to P.13A-19,
code No. P0105.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-105.)NGCheck theengine coolant temperaturesensor. (Refer to P.13A-22,
code No. P0115.)
OK
MUT-
IIActuator test
08 Purge control solenoid valve (Refer to P.13A-110.)NGCheck the purge control solenoid valve system. (Refer to P.13A-62,
code No. P0443.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
OK:
600 - 1,000 mV when theengine is suddenlyracedNGCheck the oxygen sensor (front) system. (Refer to P.13A-28, code
No. P0130.)
OK
MUT-
IIData list
59 Oxygen sensor (rear)
DTransmission: 2nd gear
DDriving with throttle widelyopen
OK:
600 - 1,000 mVNGCheck the oxygen sensor (rear) system. (Refer to P.13A-31, code
No. P0136.)
OK
To the nextpage


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GDI -Troubleshooting 13A-106
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
14Throttle posi-
tion sensorDEngine coolant
temperature:Release the accel-
erator pedal.4,000 mV or moreCode No.
P022513A-52
(2nd channel)80 - 95_C
DIgnition switch:
ON (Engine
stopped)
Depress the accel-
erator pedal gradu-
ally.Voltage decreases
in response to the
pedal depression.
Depress the accel-
erator pedal fully.400 - 600 mV
16Power supply
voltageIgnition switch: ONSystem voltageProcedure
No.2513A-98
18Cranking sig-Transmission: Neu-Engine: StoppedOFFProcedure13A-99
nal (Ignition
switch - ST)tral
Engine: CrankingON
No.27
21Engine coolant
temperature
sensorIgnition switch: ONEngine coolant
temperature:
-20_C-20_CCode No.
P011513A-22
Engine coolant
temperature: 0_C0_C
Engine coolant
temperature: 20_C20_C
Engine coolant
temperature: 40_C40_C
Engine coolant
temperature: 80_C80_C
22Crank angle
sensorDEngine: crank-
ing
DTachometer:
ConnectedCompare the engine
speed readings on
the tachometer and
the MUT-II.AccordCode No.
P033513A-56
DEngine: Idling
DAccelerator
pedal positionEngine coolant
temperature:
-20_C1,250 - 1,450 r/min
switch: ON
Engine coolant
temperature: 0_C1,100 - 1,300 r/min
Engine coolant
temperature: 20_C1,000 - 1,200 r/min
Engine coolant
temperature: 40_C900 - 1,100 r/min
Engine coolant
temperature: 80_C550 - 650 r/min*1


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GDI -Troubleshooting 13A-107
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
25BarometricIgnition switch: ONAltitude: 0 m101 kPaCode No.13A-19
pressure sen-
sor
Altitude: 600 m95 kPa
P0105
Altitude: 1,200 m88 kPa
Altitude: 1,800 m81 kPa
26Accelerator
pedal positionIgnition switch: ON
(Depress and re-Release the accel-
erator pedal.ONProcedure
No.2813A-100
switchlease the accelera-
tor pedal several
times)
Depress the accel-
erator pedal slight-
ly.OFF
27Power steer-
ing fluid pres-Engine: IdlingSteering wheel sta-
tionaryOFFProcedure
No.3013A-102
sure switch
Steering wheel
turningON
28A/C switchEngine: Idling (The
A/C compressor isA/C switch: OFFOFFProcedure
No.3113A-100
A/C compressor is
running when the
A/C switch is on.)
A/C switch: ONON
No.31
31Small lamp
switchEngine: IdlingLighting switch:
OFFOFFProcedure
No.3313A-104
Lighting switch: ONON
34Air flow sensorEngine: After hav-Engine is idlingONCode No.13A-17
reset signaling warmed up
3,000 r/minOFF
P0100
37Volumetric effi-
ciencyDEngine coolant
temperature:Engine is idling20 - 40%--
80 - 95_C
DLamps, electric
cooling fan and2,500 r/min10 - 30%
cooling fan and
all accessories:
OFF
DTransmission:
Neutral
Engine is suddenly
racedVolumetric effi-
ciency increases in
response to racing
38Crank angle
sensorDEngine: Cranking [reading is possible
at 2,000 r/min or less]
DTachometer: ConnectedEngine speeds dis-
played on the
MUT-IIand
tachometer are
identical.--


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GDI -Troubleshooting 13A-113
Terminal
No.Normal condition Check requirements (engine condition) Check item
47Power supplyIgnition switch: ONSystem voltage
59
50Camshaft position sensorEngine: Cranking0.4 - 3.0 V
Engine: Idling0.5 - 2.0 V
51Barometric pressure sensorIgnition switch:Altitude: 0 m3.7 - 4.3 V
ON
Altitude: 1,200 m3.2 - 3.8 V
52Alternator FR terminalDEngine: Warm up, and then idling
DRadiator fan: not operating
DHeadlamp: OFF®ON
DStop lamp: OFF®ON
DRear defogger: OFF®ONVoltage decreases
53Oxygen sensor (rear)DTransmission: 2nd gear
DEngine speed: 3,500 r/min or more
DDriving with the throttle valve widely
open0.6 - 1.0 V
54Power steering fluid
pressure switchEngine: Warm
up, and thenSteering wheel
stationarySystem voltage
idling
Steering wheel
turning0-3V
55Injector driver relayIgnition switch: OFF0 - 0.1 V
Ignition switch: ON0.5 - 1.0 V
56Throttle valve control servoIgnition switch: OFF0 - 0.3 V
relay
Ignition switch: ON0.5 - 1.0 V
57Engine control relayIgnition switch: OFF0-3V
Ignition switch: ONSystem voltage
60Back-up power sourceIgnition switch: OFFSystem voltage
61Air flow sensorEngine: Idling2.2 - 3.2 V
Engine: 2,500 r/min
62Intake air temperature
sensorIgnition switch:
ONIntake air temper-
ature: 0_C3.2 - 3.8 V
Intake air temper-
ature: 20_C2.3 - 2.9 V
Intake air temper-
ature: 40_C1.5 - 2.1 V
Intake air temper-
ature: 80_C0.4 - 1.0 V


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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-200
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
25BarometricIgnition switch: ONAt altitude of 0 m101 kPaCode No.13A-145
pressure
sensor
At altitude of 600 m95 kPa
25
At altitude of 1,200 m88 kPa
At altitude of 1,800 m81 kPa
26Accelerator
pedal posi-Ignition switch: ON
(Depress and re-Release the acceler-
ator pedal.ONProcedure
No.2813A-192
tion switchlease the accelerator
pedal several times)
Depress the acceler-
ator pedal slightly.OFF
27Power
steering
fluid pres-
sure switchEngine: IdlingWhen steering wheel
is turnedONProcedure
No.3013A-194
28A/C switchEngine: Idling
(The A/C compres-A/C switch: OFFOFFProcedure
No.3113A-194
(The A/C compres-
sor is running when
the A/C switch is on.)
A/C switch: ONON
No.31
31Small lampEngine: IdlingLighting switch: OFFOFFProcedure13A-195
switch
Lighting switch: ONON
No.33
34Air flow sen-Engine: After havingIdlingONCode No.13A-133
sor reset
signalwarmed up
3,000 r/minOFF
12
37VolumetricDEngine coolantIdling20 - 40%--
efficiencytemperature: 85 -
95
_C
Lamps and all
2,500 r/min10 - 30%DLamps and all
accessories: OFF
DTransmission: P
range
Engine is suddenly
racedVolumetric effi-
ciency increases
in response to
racing
38Crank angle
sensorDEngine: Cranking (reading is possible at 2,000
r/min or less)
DTachometer: ConnectedEngine speeds
displayed on the
MUT-IIand
tachometer are
identical.--


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GDI -Troubleshooting/On-vehicle Service13A-7
CHECK AT THE ENGINE-ECU TERMINALS
TERMINAL VOLTAGE CHECK CHART
Engine-A/T-ECU Connector Terminal Arrangement
The terminals below have been changed as the engine-A/T-ECU has been changed. The other terminals
are the same as before.
Terminal No.Check itemCheck requirements (Engine condition)Normal condition
3Oxygen sensor heat-
er(front)
Engine: Idling0-3V
er(front)
Engine: 3,500 r/minSystem voltage
26Oxygen sensor heat-
er(rear)
Engine: Idling0-3V
er(rear)
Engine: 3,500 r/minSystem voltage
71Oxygen sensor (front)Engine: Warmed up, and then hold the engine
speed at 2,500 r/min (Use a digital voltmeter)0 and 0.8 V alternate.
73Oxygen sensor (rear)DTransmission: 2nd gear
DEngine speed: 3,500 r/min or more
DDriving with the throttle valve widely open0.6 - 1.0 V
Engine-A/T-ECU Harness-side Connector Terminal Arrangement
The terminals below have been changed as the engine-A/T-ECU has been changed. The other terminals
are the same as before.
Terminal No.Check itemStandard value, normal condition (check conditions)
3-41Oxygen sensor heater (front)11 - 1 8Ω(at 20_C)
26 - 41Oxygen sensor heater (rear)11 - 1 8Ω(at 20_C)
ON-VEHICLE SERVICE
OXYGEN SENSOR CHECK
On A/T, a dual oxygen sensor has been adopted. Its service
procedure is the same as for the previous M/T.


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