Mitsubishi Outlander XL. Manual - part 361

｠

MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition  switch  to  the  "LOCK"  (OFF)  position  before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958 to the data link connector.

(2)

Turn the ignition switch to the "ON" position.

(3)

Read the DTC.

(4)

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

Q:Is the diagnostic trouble code other than P1237 set?

YES:

 Refer to, Diagnostic Trouble Code Chart P.13Ab-44.

NO:

 Go to Step 2.

STEP 2. Using scan tool MB991958, check data list.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check the following item in the data list. Refer to Data List
Reference Table .

a
.

Item 11: Accelerator pedal position sensor (main)

b
.

Item 12: Accelerator pedal position sensor (sub)

(3)

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

Q:Is the sensor operating properly?

YES:

 Go to Step 3.

NO:

 Repair or replace it. Then go to Step 4.

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

(1)

Turn the ignition switch to the "ON" position.

(2)

After the DTC has been deleted, read the DTC again.

(3)

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

Q:Is DTC P1237 set?

YES:

 Replace the ECM. When the ECM is replaced, register

the ID code. Refer to GROUP 42B, ID Code Registration
Judgment Table <Vehicles with KOS> P.42B-12or GROUP
42C, ID Code Registration Judgment Table <Vehicles with
WCM> P.42C-8. Then go to Step 4.

NO:

 It can be assumed that this malfunction is

intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunctions P.00-15.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-639

DIAGNOSTIC TROUBLE CODE PROCEDURES

STEP 4. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

(1)

Turn the ignition switch to the "ON" position.

(2)

Read the DTC.

(3)

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

Q:Is DTC P1237 set?

YES:

 Replace the troubleshooting.

NO:

 The procedure is complete.

DTC P1238: Mass Airflow Sensor Plausibility (Torque Monitor)

M11310100384USA0000010000

TECHNICAL DESCRIPTION
Compare  the  actual  measurement  of  volumetric
efficiency  by  a  mass  airflow  sensor  signal  with
volumetric efficiency estimated from a throttle position
sensor (main or sub) signal.

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored in
memory for the item monitored below)

｠

Not applicable

Sensor (The sensor below is determined to be
normal)

｠

Not applicable

13Ab-640

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC SET CONDITIONS

ZK604065 AA00

Start

End

No

No

Yes

Yes

Yes

No

Malfunction

Good

Continuous failure

for specfied time

|Ec-calculated Ec|

> 55%

Monitoring

conditions

Ec: load valve

Check Conditions

｠

The  difference  between  the  actual  volumetric
efficiency  and  the  volumetric  efficiency  estimated
by the (main) throttle position sensor is 0 % or more.
Or, the volumetric efficiency is 60 % or less.

｠

Engine speed is 750 r/min or higher.

Judgment Criterion

｠

For 0.5 second, the difference between the actual
volumetric efficiency and the volumetric efficiency
estimated by the (main) throttle position sensor is
35 % or more.

Check Condition

｠

The  difference  between  the  actual  volumetric
efficiency  and  the  volumetric  efficiency  estimated
by the (sub) throttle position sensor is 0% or more.
Or, the volumetric efficiency is 60% or less.

｠

Engine speed is 750 r/min or higher.

Judgment Criterion

｠

For 0.5 second, the difference between the actual
volumetric efficiency and the volumetric efficiency
estimated by the (sub) throttle position sensor is 35
% or more.

OBD-II DRIVE CYCLE PATTERN
Refer  to  Diagnostic  Function  -  OBD-II  Drive  Cycle
Pattern 17 P.13Ab-8.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

｠

Mass airflow sensor system failed.

｠

ECM failed.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-641

DIAGNOSTIC TROUBLE CODE PROCEDURES

DIAGNOSIS

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: V.C.I.

｠

MB991827: USB Cable

｠

MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition  switch  to  the  "LOCK"  (OFF)  position  before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958 to the data link connector.

(2)

Turn the ignition switch to the "ON" position.

(3)

Read the DTC.

(4)

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

Q:Is the diagnostic trouble code other than P1238 set?

YES:

 Refer to, Diagnostic Trouble Code Chart P.13Ab-44.

NO:

 Go to Step 2.

STEP 2. Using scan tool MB991958, check data list item 10:
Mass Airflow Sensor.

(1)

Start the engine and run at idle.

(2)

Set scan tool MB991958 to the data reading mode for item
10, Mass Airflow Sensor.

(3)

Warm up the engine to normal operating temperature: 80°C
to 95°C (176°F to 203°F).

｠

The standard value during idling should be between 1,350
and 1,670 millivolts.

｠

When the engine is revved, the mass airflow rate should
increase according to the increase in engine speed.

(4)

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

Q:Is the sensor operating properly?

YES:

 Go to Step 3.

NO:

 Refer to, DTC P0101 - Mass Airflow Circuit Range/

Performance Problem P.13Ab-108, DTC P0102 - Mass Airflow
Circuit Low Input P.13Ab-115, DTC P0103 - Mass Airflow
Circuit High Input P.13Ab-121.

13Ab-642

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES