MITSUBISHI MONTERO 2000 Service Repair Manual

GDI -Troubleshooting <A/T>13A-157
OK
Measure at accelerator pedal position
sensor connector D-135.
DConnect connector terminals
No.1, No.2 and No.3 only by
using test harness (MB991658),
and measure at the pick-up
harness.
DIgnition switch: ON
(1) Voltage between terminal 1 and
earth
OK:
0.5 V or less
(2) Voltage between terminal 2 and
earth
OK:
4.8 - 5.2 V
(3) Voltage between terminal 3 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higher(1), (2) NGCheck the following connector:
D-32NG
Check the following connector:
D-31NG
Repair OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
From the previouspage
(3) NG
Adjust the acceleratorpedal position
sensor. (Refer to P.13A-221.)
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
OK
Measure at engine-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 95 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higherNGCheck the following connector:
D-121NGRepair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
OKCheck the following connector:
D-121NG
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.Repair
Repair


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-158
Code No.79 Throttle position sensor (1st channel)
systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DIgnition switch: ON
Set Conditions
DThe sensor output voltage is 0.2 V or less.
or
DThe sensor output voltage is 4.85 V or more and the throttle position sensor
(2nd channel) output voltage is 2.5V or more.
or
DThe throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 - 6V.
or
DThe opening angle of throttle positionsensor (1st channel) is different from
its target by 1V or more.
or
DThe throttle position sensor (1st channel) output changes within 25 mV when
the throttle valve control servo moves one step.DMalfunction of throttle position sensor
DOpen or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
DMalfunction of throttle valve controller
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
MUT-
IIData list
79 Throttle position sensor (1st
channel) (Refer to P.13A-198,
DATA LIST REFERENCE
TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the throttle position sensor.
(Refer to P.13A-228.)NG
Replace
OK
Measure at throttle position sensor
connector B-102.
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 3
and earth
OK:
2Wor less(1) NGMeasure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DVoltage between terminal 6 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-11
NG
Repair
NG
Check the following connector:
D-11NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
NG
Check the following connector:
B-102NG
Repair
(2) NGCheck the following connector:
D-11NGRepair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller.NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller.NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
OK
To the nextpage


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-159
OK
Measure at throttle valve controller
connector D-11.
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-11NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
OK
Check the following connector:
D-11
OK
Check the trouble symptoms.
NG
Replace the throttle valve controller.
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 2 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.4 - 0.8 V
Acceleratorpedalfully de-
pressed: 4.2 - 4.8 V
(3) Voltage between terminal 3 and
earth
OK:
0.5 V or less(1) NGCheck the following connector:
D-11NG
Repair
(3) NG
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
(2) NG
Adjust the throttle position sensor.
(Refer to P.13A-220.)
Check the following connector:
D-11NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>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


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>GDI -Troubleshooting <A/T>13A-161
OK
Check the right bank injectors for
clogging or leaks.NG
Repair
OK
Check the right bank fuel lines for
fuel leaks.NG
Repair
OK
Check the fuel pressure between the
fuel pump(low-pressure) and the
fuel pump (high-pressure)(Refer to
P.13A-112).NG
From the previouspage
OK
Check the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the engine-A/T-ECU.
OK
Check the EGR valve (Refer to
GROUP 17 - Emission Control).NG
Replace
Check the fuelline between the fuel
pump(low-pressure) and the fuel
pump (high-pressure)(Refer to
P.13A-222).
Code No.91 Electronic-controlled throttle valve systemProbable cause
Range of Check
DIgnition switch: ON
DError in communication between the engine-A/T-ECU and the throttle valve
controller
Set Conditions
DOutput voltage of throttle position sensor (2nd channel) fluctuates significantly
(approx. 1 V or more) from an expected value, based on that of the
accelerator pedal positionsensor (2nd channel).
Range of Check
DIgnition switch: ON
DError in communication between the throttle valve controller and the
engine-A/T-ECU
Set Conditions
DThe output voltage of the throttle position sensor (2nd channel) is significantly
different (approx. 1 V) from the the throttle valveopening angle (voltage),
which the engine-A/T-ECU request the throttle valve controller.DShort in communicationline
DMalfunction of the engine-A/T-ECU
DMalfunction of the throttle valve controller
OK
Check the harness wire between the throttle valve controller
and the engine-A/T-ECU.NG
Repair
NG
Replace the engine-A/T-ECU.
Check the following connectors:
D-11, D-119, D-122NG
Repair
OK
NG
Replace the throttle valve controller.
Check the trouble symptoms.
Check the trouble symptoms.


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-162
Code No.92 Throttle valve position feedback systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DIgnition switch: ON
DBattery voltage: 10 V or more
Set Conditions
DFailure in the position feedback
[The engine-A/T-ECU detects that the current in the motor isexcessive and
the opening angle difference between the targetvalue of throttle position
sensor (1st channel) and the actual value of throttle position sensor (1st
channel) is 2.0V or more]DMalfunction of throttle position sensor (1st channel)
DOpen or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
DMalfunction of the throttle valve controller
NG
Replace the throttle valve controller.
OK
Check the trouble symptoms.
NG
Check the harness wires between the throttle position sensor
and the throttle valve controller, and between the throttle valve
control servo and the throttle valve controller.NG
Repair
NO
Adjust the throttle position sensor. (Refer to P.13A-220.)
MUT-
IISelf-Diag Code
Is code No.79 set?YESRefer to Code No.79, Throttle position sensor (1st channel)
system. (Refer to P.13A-158.)
NO
MUT-
IISelf-Diag Code
Is Code No.93 set?YESRefer to Code No.93, Throttle valve control servo system
(Refer to P.13A-163.)
OK
Check the following connectors:
B-102, B-122, D-11NG
Repair
OK
Check the throttle valve control servo. (Refer to 13A-232.)NGReplace the throttle body assembly.


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-163
Code No.93 Throttle valve control servo systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DThrottle valve control servo relay: ON
Set Conditions
DShort circuit of the throttle valve control servo drive circuit to earth
DPower is supplied to the throttle valve control servo circuit from other
sources.
DOpen circuit in the throttle valve control servo power supply circuitDMalfunction of the throttle valve control servo
DOpen circuit in the throttle valve control servo
power supply circuit
DOpen or short circuit in the throttle valve control
servo circuit or loose connector contact
DMalfunction of throttle valve controller
OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the following connector:
B-122NG
Repair
OK
Measure at the throttle valve control
servo connector B-122
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DThe voltage between terminal 1
and earth
DThe voltage between terminal 2
and earth
DThe Voltage between terminal 3
and earth
OK:
Voltage changes between 5
- 7 V when the accelerator
pedal is operated.
NOTE: Erase the diagnosis code
before the measurement
since a diagnosis code is
recorded when the harness
is disconnected.NGCheck the following connector:
D-11NG
Repair
OK
Check the trouble symptoms.
OK
Check the trouble symptoms.
OK
Check the harness wire between the
throttle valve control servo and the
throttle valve controller.NG
Repair
NG
Check the throttle valve control
servo. (Refer to P.13A-232.)NGReplace the throttle body assembly
NG
Replace the throttle valve controller.
NG
Replace the throttle valve controller.
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Check the operation of the throttle
valve control servo.
OK:
The throttle valve opens or
closes when the accelerator
pedal is depressed or released.


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-164
Code No.94 Communication line system with the throttle
valve controllerProbable cause
Range of Check
DIgnition switch: ON
DBattery voltage: 8 V or more.
DEngine: not cranking
Set Conditions
DSystem detects an error in communicationline between the engine-A/T-ECU
and the throttle valve controller, and between the throttle valve controller and
the engine-A/T-ECU.DShort in communicationline
DMalfunction of engine-A/T-ECU
DMalfunction of throttle valve controller
MUT-
IISelf-Diag Code
Is Code No.91 output?YESRefer to Code No.91, Electronic-con-
trolled throttle valve system (Refer to
P13A-161.)
NO
NG
Repair
OK
Measure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
(1) The voltage between terminal 5
and earth
OK:
System voltage
(2) The voltage between terminal 22
and earth
OK:
System voltage
(3) The voltage between terminal 3
and earth
The voltage between terminal 4
and earth
The voltage between terminal 16
and earth
OK:
0.5 V or less(1) NGCheck the following connectors:
B-25X,
D-128NG
Repair
Check the trouble symptoms.OK
Check the harness wire between the
throttle valve controller and theengine
control relay, and repair if necessary.
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
(2) NGCheck the following connectors:
D-208,
D-223, E-13NG
Repair
OK
Check the harness wire between the
throttle valve controller and the ignition
switch, and repair if necessary.
(3) NGCheck the following connector:
D-14NG
Repair
OK
Check the harness wire between the
throttle valve controller and earth, and
repair if necessary.
OK
Check the following connectors:
D-119, D-122NG
Repair
OK
Check the harness wire between the
throttle valve controller and the
engine-A/T-ECU.NG
Repair
NG
Replace the throttle valve controller.
Check the following connector:
D-11


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-165
Code No.96 Throttle valve controller systemProbable cause
Set Conditions
DErrors in reading or writing to the throttle valve controller ROM.DMalfunction of the throttle valve controller
Replace the throttle valve controller.


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting <A/T>13A-166
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspection
procedure
No.Reference page
CommunicationCommunication with all systems is not possible.113A-169
with MUT-IIis
impossible.
Communication with engine-A/T-ECU only is not possible.213A-169
Engine warning
lamp andThe engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.313A-170
related parts
The engine warning lamp remains illuminating and never goes
out.413A-170
StartingNo initial combustion (starting impossible)513A-171
Initial combustion but no complete combustion
(starting impossible)613A-172
Long time to start (improper starting)
Idling stabilityUnstable idling (Rough idling, hunting)713A-174
(Improper idling)
Idling speed is high. (Improper idling speed)813A-176
Idling speed is low. (Improper idling speed)
Idling stabilityWhen the engine is cold, it stalls at idling. (Die out)913A-177
(Engine stalls)
When the engine is hot, it stalls at idling. (Die out)1013A-178
The engine stalls when starting the car. (Pass out)1113A-180
The engine stalls when decelerating.1213A-181
DrivingHesitation, sag or stumble1313A-182
Poor acceleration
Surge
The feeling of impact or vibration when accelerating1413A-183
The feeling of impact or vibration when decelerating1513A-184
Knocking1613A-184
Dieseling1713A-184
Too high CO and HC concentration when idling1813A-185
Low alternator output voltage (approx. 12.3 V)1913A-186
Engine idle speed is incorrect while the A/C is on (A/C switch 2 signal).2013A-187
Fans (radiator fan, A/C condenser fan) are inoperative2113A-187
GDI ECO indi-GDI ECO indicator lamp does not illuminate.2213A-188
cator lamp sys-
tem
GDI ECO indicator lamp remains illuminated and does not go off.2313A-188


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk