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Mitsubishi Montero (2002-2004). Manual - part 562

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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P0554

Power steering pressure sensor circuit intermittent

P0606*

Powertrain control module main processor malfunction

P0638*

Throttle actuator control motor circuit range/ performance

P0642*

Throttle position sensor power supply

P0657*

Throttle actuator control motor relay circuit malfunction

P0660

Intake manifold tuning circuit malfunction

P0705

Transmission range switch circuit malfunction (RPNDL input)

P0712

Transmission fluid temperature sensor circuit low input

P0713

Transmission fluid temperature sensor circuit high input

P0715

Input/Turbine speed sensor circuit

P0720

Output speed sensor circuit

P0731

Gear 1 incorrect ratio

P0732

Gear 2 incorrect ratio

P0733

Gear 3 incorrect ratio

P0734

Gear 4 incorrect ratio

P0735

Gear 5 incorrect ratio

P0736

Gear R incorrect ratio

P0741

Torque converter clutch circuit performance or stuck off

P0742

Torque converter clutch circuit stuck on

P0743

Torque converter clutch circuit electrical

P0753

Shift solenoid "A" electrical

P0758

Shift solenoid "B" electrical

P0763

Shift solenoid "C" electrical

P0768

Shift solenoid "D" electrical

P0773

Shift solenoid "E" electrical

P1400

Manifold differential pressure sensor circuit malfunction

P1601*

Communication malfunction (between PCM and throttle actuator control module)

P1603*

Battery backup circuit malfunction

P1751

A/T control relay malfunction

P2100*

Throttle actuator control motor circuit (open)

P2101*

Throttle actuator control motor magneto malfunction

P2102*

Throttle actuator control motor circuit (shorted low)

P2103*

Throttle actuator control motor circuit (shorted high)

P2108*

Throttle actuator control processor malfunction

P2121*

Accelerator pedal position sensor (main) circuit range/performance problem

P2122*

Accelerator pedal position sensor (main) circuit low input

P2123*

Accelerator pedal position sensor (main) circuit high input

P2126*

Accelerator pedal position sensor (sub) circuit range/performance problem

P2127*

Accelerator pedal position sensor (sub) circuit low input

DTC NO.

ITEMS

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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NOTE: If the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates
because of a malfunction of the powertrain control module (PCM), transmission between scan tool MUT-II
(MB991502) and the PCM is impossible. In this case, the diagnostic trouble code cannot be read.
NOTE: After the PCM has detected a malfunction, the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) illuminates when the engine is next turned on and the same malfunction is re-
detected. However, for items marked with a "*" in the DTC NO. column, the Malfunction Indicator Lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) illuminates only on the first detection of the malfunction.
NOTE: After the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates,
it will be switched off under the following conditions.

•

When the PCM monitored the power train malfunction three times* and met set condition requirements, it
detected no malfunction. *: In this case, "one time" indicates from engine start to stop.

•

For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant tempera-
ture, etc.) are similar to those when the malfunction was first recorded.

NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second closest to the engine.
NOTE: Bank 1 indicates the right bank side cylinder, and bank 2 indicates the left bank side cylinder.

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODE

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
NOTE: If Battery positive voltage is low, diagnostic trouble
codes may not be output. Be sure to check the battery and
charging system before continuing.
NOTE: If battery cable is disconnected or if the powertrain con-
trol module (PCM) connector is disconnected, the diagnostic
trouble codes will be erased. Do not disconnect the battery
cable or PCM connector until the diagnostic trouble codes have
been recorded.
NOTE: If a DTC is erased, its "freeze frame" data will be also
erased and the system readiness test status will be reset. If
necessary, store the "freeze frame" data before erasing the
DTC.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the diagnostic trouble codes for MFI.
4. Refer to the DIAGNOSTIC TROUBLE CODE CHART.

P.13Ab-22

P2128*

Accelerator pedal position sensor (sub) circuit high input

P2135*

Throttle position sensor (main and sub) range/performance problem

P2138*

Accelerator pedal position sensor (main and sub) range/performance problem

DTC NO.

ITEMS

ACX01539

16-PIN

MB991502

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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5. Turn the ignition switch to the "LOCK" (OFF) position and

then back to "ON" again.

6. Erase the diagnostic trouble code(s) using MUT-II screen

prompts.

7. Confirm that the diagnostic trouble code output is normal.
8. Turn the ignition switch to the "LOCK" (OFF) position.
9. Disconnect scan tool MB991502 from the data link

connector.

PROVISIONAL DTCs [MUT-II OBD-II Test Mode -
Results (Mode 5)]

The MUT-II will display the Provisional DTCs reported by PCM
if the PCM detects some malfunction for "Misfire", "Fuel Sys-
tem" and "Comprehensive" monitoring during a SINGLE Driv-
ing Cycle. The intended use of this data is to assist the
technician after a vehicle repair, and after clearing diagnostic
information, by reporting test result after a SINGLE Driving
Cycle. Note that the test results reported by this mode do not
necessarily indicate a faulty component/system. If test results
indicate a failure after ADDITIONAL (consecutive) driving, then
the Malfunction Indicator Lamp (SERVICE ENGINE SOON or
Check Engine Lamp) will be illuminated and a DTC will set.

MODE 6 REFERENCE TABLE

The powertrain control module (PCM) monitors the condition of emission control system.
By selecting MODE 6 using scan tool, Test Result and Limit Value (minimum) *1 or (maximum) *2 about the
main items of emission control system which PCM monitors can be confirmed. The value at the last monitor-
ing is output by PCM as a test result.

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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TEST
ID

MONITORING
ITEM

SIMPLE TECHNICAL
DESCRIPTION

INDICATION OF SCAN
TOOL

CONVERSION
COEFFICIENT IN
USING
GENERAL SCAN
TOOL

Catalyst
monitor (Bank
1)

PCM monitors the deterioration of
catalyst at right bank side by the
output frequency ratio between
right bank heated oxygen sensor
(front) and right bank heated
oxygen sensor (rear).

Catalyst Frequency
Ratio Bank 1
Test Result and Limit
Value (max.)

× 0.0039

Catalyst
monitor (Bank
2)

PCM monitors the deterioration of
catalyst at left bank side by the
output frequency ratio between left
bank heated oxygen sensor (front)
and left bank heated oxygen sensor
(rear).

Catalyst Frequency
Ratio Bank 2
Test Result and Limit
Value (max.)

× 0.0039

EGR monitor

PCM monitors the operation of
EGR system by the pressure
difference of intake manifold
between before and after
introduction of EGR using the
manifold differential pressure
sensor.

EGR Monitor Pressure
Value
Test Result and Limit
Value (min.) kPa

× 0.43 kPa

Evaporation
leak monitor
(Small leak)

PCM monitors the leak of fuel
evaporation gas by the reduction of
vacuum in tank after appointed time
using the fuel tank differential
pressure sensor after making the
fuel tank and the fuel line vacuum.

EVAP Leak Mon. 1 mm
Pressure Value
Test Result and Limit
Value (max.) kPa

× 0.032 kPa

Evaporation
leak monitor
(Gross leak)

PCM monitors the leak of fuel
evaporation gas by checking
whether the pressure can be
reduced (the amount of pressure
reduction) using the fuel tank
differential pressure sensor after
sealing the fuel tank and the fuel
line.

EVAP Leak Mon. Gross
Pressure Value
Test Result and Limit
Value (min.) kPa

× 0.032 kPa

Evaporation
leak monitor
(Very small
leak)

EVAP Leak Mon. 0.5
mm Pressure Value
Test Result and Limit
Value (max.) kPa

× 0.032 kPa

Heated oxygen
sensor monitor
(Rich/Lean
Switching)
(Bank 1 Sensor
1)

PCM monitors the deteriorated
condition of the heated oxygen
sensor by checking the lean/rich
Switching frequency of the heater
oxygen sensor.

HO2S B1 SENSOR 1
Rich/Lean Switching
Count
Test Result and Limit
Value (min.)

×1 count

Content .. 560 561 562 563 ..