2005 MITSUBISHI 380 ECU

17-1
GROUP 17
ENGINE AND
EMISSION
CONTROL
CONTENTS
ENGINE CONTROL. . . . . . . . . .
17-3
GENERAL DESCRIPTION . . . . . .
17-3
ENGINE CONTROL SYSTEM
DIAGNOSIS . . . . . . . . . . . . . . . . . .
17-3
INTRODUCTION . . . . . . . . . . . . . . . . . . 17-3
TROUBLESHOOTING STRATEGY . . . 17-3
SYMPTOM CHART . . . . . . . . . . . . . . . . 17-4
SYMPTOM PROCEDURES . . . . . . . . . 17-4
SPECIAL TOOL . . . . . . . . . . . . . . .17-8
ACCELERATOR PEDAL . . . . . . . .17-9
REMOVAL AND INSTALLATION . . . . . 17-9
AUTO-CRUISE CONTROL . . . .17-10
GENERAL DESCRIPTION . . . . . .
17-10
AUTO-CRUISE CONTROL SYSTEM
DIAGNOSIS . . . . . . . . . . . . . . . . . .
17-10
INTRODUCTION TO AUTO-CRUISE
CONTROL SYSTEM DIAGNOSIS . . . . . 17-10
DIAGNOSTIC TROUBLESHOOTING
STRATEGY . . . . . . . . . . . . . . . . . . . . . . 17-11
DIAGNOSTIC FUNCTION . . . . . . . . . . . 17-11
DIAGNOSTIC TROUBLE CODE CHART17-14
DIAGNOSTIC TROUBLE CODE
PROCEDURES . . . . . . . . . . . . . . . . . . . 17-15
SYMPTOM CHART . . . . . . . . . . . . . . . . 17-53
SYMPTOM PROCEDURES . . . . . . . . . . 17-54
DATA LIST REFERENCE TABLE . . . . . 17-65
ENGINE ECU TERMINAL VOLTAGE
REFERENCE CHART FOR AUTO-CRUISE
CONTROL SYSTEM OPERATION . . . . 17-67
SPECIAL TOOLS . . . . . . . . . . . . . .17-69
ON-VEHICLE SERVICE . . . . . . . . .17-71
AUTO-CRUISE CONTROL SWITCH
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . 17-71
AUTO-CRUISE CONTROL SYSTEM
COMPONENT CHECK. . . . . . . . . . . . . . 17-73
AUTO-CRUISE CONTROL. . . . . . .17-75
REMOVAL AND INSTALLATION . . . . . . 17-75
Continued on next page

ENGINE CONTROL
ENGINE AND EMISSION CONTROL17-4
SYMPTOM CHARTM1171002200292
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Throttle Valve Will Not Fully Open or Close
.
COMMENT
The throttle body or accelerator pedal position (APP)
sensor is suspected.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
Malfunction of the throttle body.
Malfunction of the accelerator pedal position
(APP) sensor.
Malfunction of the Engine ECU.
Circuit drawings
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Refer to component locations GROUP-70 SYMPTOM INSPECTION PROCEDURE REFERENCE PAGE
Throttle Valve Will Not Fully Open or Close 1
P.17-4
Accelerator Pedal Operation Not Smooth (Over
Acceleration)2
P.17-6

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-10
AUTO-CRUISE CONTROL
GENERAL DESCRIPTIONM1172000100281
By using the auto-cruise control system, the driver
can select and maintain a desired cruising speed
[between 40 km/h (25 mph) and 200 km/h (124
mph)] without depressing the accelerator pedal.NOTE: If engine speed reaches and exceeds 6000
r/min the Auto Cruise Control System will be can-
celled automatically.
CONSTRUCTION DIAGRAM
AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS
INTRODUCTION TO AUTO-CRUISE CONTROL SYSTEM DIAGNOSISM1172003300251
The auto-cruise control system allows driving without
stepping on the accelerator pedal by setting a ran-
dom speed between 40 km/h (25 mph) and 200 km/h
(124 mph). Problems in this system can be investi-
gated by the following methods.Auto-cruise control system diagnostic
trouble codes
The auto-cruise control system consists of the
Engine ECU, control switches and sensors. The con-
trol switches and sensors monitor the state of the
vehicle. The Engine ECU controls the throttle valve
opening angle in the throttle body in accordance with
the input signals from the switches and sensors. If
the Engine ECU detects a problem on any of those
91
01
1
12
1
31
41
5
16 123
456
78

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-11
components, the Engine ECU estimates where the
problem may be occurring, and will set a diagnostic
trouble code. Diagnostic trouble codes cover the
auto-cruise control switch, stoplamp switch and
Engine ECU.
DIAGNOSTIC TROUBLESHOOTING STRATEGYM1172002000484
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will check most of the
possible causes of an auto-cruise control system
problem.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any auto-cruise control
system DTC. (Refer to P.17-11, Diagnostic
Function
How to Read and Erase Diagnostic
Trouble Codes).
4. If you can verify the condition but no auto-cruise
control system DTCs are set, the malfunction may
be intermittent. (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
How
to Cope with Intermittent Malfunctions P.00-14).5. If you can verify the condition but there are no
auto-cruise control system DTCs, or the system
cannot communicate with Diagnostic Tool
MB991958 (MUT-III sub assembly), and find the
fault. (Refer to P.17-53, Symptom Chart).
6. If there is an auto-cruise control system DTC,
record the number of the code, then erase the
code from Engine ECU memory using the
Diagnostic Tool MB991958 (MUT-III sub
assembly). (Refer to P.17-11, Diagnostic Function
How to Read and Erase Diagnostic Trouble
Codes).
7. Re-create the auto-cruise control system DTC set
conditions to see if the same Auto-cruise Control
System DTC will set again. (Refer to P.17-11,
Diagnostic Function
How to Read and Erase
Diagnostic Trouble Codes).
If the same Auto-cruise Control System DTC sets
again, perform the diagnostic procedures for the
set code. (Refer to P.17-14, Diagnostic Trouble
Code Chart).
DIAGNOSTIC FUNCTIONM1172004900171
HOW TO CONNECT THE DIAGNOSTIC TOOL.
Required Special Tools:
MB991958: Diagnostic Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-14
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
1. Connect Diagnostic Tool MB991958 to the data link
connector.
2. Turn the ignition switch to the "ON" position.
3. Select the "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it
matches the vehicle whose CAN bus lines will be
diagnosed.
If the information is correct, go to step 8.
If not, go to step 5.
5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again
that it matches the vehicle which is diagnosed CAN bus line.
If they match, go to step 8.
If not, go to step 5.
8. Press the "OK" button.
9. When the optional equipment screen is displayed, choose
the one which the vehicle is fitted with, and then select the
"OK" button.
10.Turn the ignition switch to the "LOCK" (OFF) position.
11.Disconnect Diagnostic Tool MB991958.
DIAGNOSTIC TROUBLE CODE CHARTM1172002200295
Check according to the inspection chart that is
appropriate for the diagnostic trouble code.
DTC NO. INSPECTION ITEM REFERENCE PAGE
P0830 Clutch switch system
P.17-15
P1564 Auto-cruise control switch system
P.17-20
P1575 Cancel latch signal system
P.17-34
P1571 Stoplamp switch system
P.17-35
P1574
Engine ECU and its related componentsP.17-50

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-15
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC P0830: Clutch Switch (5M/T Only)
.
CIRCUIT OPERATION
A 5 Volt power supply is applied to the clutch
switch output terminal (terminal No. 1) from the
ENGINE-ECU(terminal No. B-21 pin 41) when
the clutch pedal is applied the power supply is
switched to earth.
.
TECHNICAL DESCRIPTION
The ENGINE-ECU uses the clutch switch earth-
ing as a signal that clutch pedal has been
applied.
.
DTC SET CONDITIONS
Check Conditions
Vehicle speed is above 50 km/h.Judgement Criteria
Gear shift is above 5 times.
Clutch control is below 2 times.
No MIL.
No Limp home.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
Clutch switch failed
Harness damage in clutch switch circuit, or con-
nector damage.
Refer to component locations GROUP-70
Refer to configuration diagrams GROUP-80
Refer to circuit diagrams GROUP-90
DIAGNOSIS
Required Special Tools:
: Diagnostic tool (MUT-III Sub Assembly)
MB991824: V.C.I.
MB991827: USB Cable
MB991910: Main Harness A

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-18
STEP 4. Measure the power supply voltage at ENGINE-ECU
connector B-21 by using ENGINE-ECU check harness
special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect
ENGINE-ECU check harness special tool MB992044
between the separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 41 and ground.
Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Repair or replace the open or damaged wiring circuit
between ENGINE-ECU connector B-21 and Clutch
switch connector C-07. Then go to Step 8.
NO : Check the connector B-21 for damage and ensure
check harness connection t ENGINE-ECU is correct.
If connection is correct and no power supply is
present at terminal 41 of ENGIN-ECU then replace it.
Then go to Step 7.
STEP 5. Measure the clutch switch power supply voltage
by backprobing the clutch switch connector C-07 (terminal
2).
(1) Measure the voltage between terminal No. 2 and ground by
backprobing. while depressing the clutch pedal.
When pedal is not depressed an (open circuit) , voltage
should be battery positive voltage.
When pedal is depressed an (closed circuit) , voltage
should be less than 1.0 volt.
Q: Is there battery voltage at terminal No. 2 when pedal is
depressed?
YES : Go to Step 6.
NO : Replace the Clutch switch. Refer to GROUP 21A,
Clutch - On-vehicle Service - Clutch Pedal Check and
Adjustment P.21A-2. Then go to Step 7.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-21
CIRCUIT OPERATION
This circuit judges the signals of each switch
("COAST/SET", "ACC/RES" and "CANCEL") of the
auto-cruise control switch. The Engine ECU detects
the state of the auto-cruise control switch by sensing
the voltages shown below.
When all switches are OFF: 4.7 5.0 volts
When the "CRUISE" (MAIN) switch is "ON": 0
0.3 volt
When the "COAST/SET" switch is ON: 2.0 2.8
volts
When the "ACC/RES" switch is ON: 3.3 4.1
volts
When the "CANCEL" switch is ON: 0.8 1.5 volts
.
DTC SET CONDITIONS
Check Condition
The "CRUISE" indicator lamp illuminates.Judgement Criteria
If the auto-cruise control switch is operated, this
DTC will be set when the Engine ECU terminal
voltage is different from the standard value.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
Malfunction of the auto-cruise control switch.
Malfunction of the clock spring.
Damaged harness or connector.
Malfunction of the Engine ECU.
Circuit drawings
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Refer to component locations GROUP-70
DIAGNOSIS
Required Special Tools:
MB991958: Diagnostic Tool (MUT-III Sub Assembly)
MB991824: V.C.I.
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
MB991223: Harness Set
MB992044: ENGINE-ECU Check Harness