engine MITSUBISHI MONTERO 2000 Service Repair Manual

ENGINE ELECTRICAL -Glow System <4D5-StepIII>16-1
GROUP 16
ENGINE ELECTRICAL
GLOW SYSTEM <4D5-STEPIII>
GENERAL
OUTLINE OF CHANGE
Glow system control is now carried out by the engine-ECU to correspond to the adoption of an
electronically-controlled fuel injection system.
Refer to GROUP 13E - Troubleshooting for details on measuring the ECU terminal voltage as a result
of this.


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ENGINE AND
EMISSION CONTROL
Click on the applicable bookmark to selected the required model year.


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17-1
ENGINE AND
EMISSION
CONTROL
CONTENTS
ENGINE CONTROL SYSTEM 3........
GENERAL INFORMATION 3................
SERVICE SPECIFICATIONS 3..............
ON-VEHICLE SERVICE 3..................
Accelerator Cable Check and Adjustment
<4D5> 3...................................
ACCELERAOR CABLE AND PADAL 4......
AUTO-CRUISE CONTROL SYSTEM 7..
GENERAL INFORMATION 7................
SPECIAL TOOL 8.........................
TROUBLESHOOTING 9....................
ON-VEHICLE SERVICE 27................
Auto-cruise Control Main Switch Check 27....
Auto-cruise Control Switch Check 28..........
Auto-cruise Control Component Check 29.....
AUTO-CRUISE CONTROL SWITCH 30.....
EMISSION CONTROL SYSTEM
<6G7> 31.............................
GENERAL INFORMATION 31..............
Emission Control Device Reference
Table 31....................................
SERVICE SPECIFICATIONS 32............
SPECIAL TOOL 32.......................
VACUUM HOSE 32.......................
Vacuum Hose Piping Diagram 32.............
Vacuum Circuit Diagram 33..................
Vacuum Hose Check 33.....................
Vacuum Hose Installation 33.................
CRANKCASE EMISSION CONTROL
SYSTEM 34..............................
General Information 34......................
System Diagram 34.........................
Component Location 34......................
Positive Crankcase Ventilation System
Check 35...................................
PCV Valve Check 35........................
CONTINUED ON NEXT PAGE


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17-2
EVAPORATIVE EMISSION CONTROL
SYSTEM 36..............................
General Information 36......................
System Diagram 36.........................
Component Location 36......................
Purge Control System Check 37..............
Purge Port Vacuum Check 37................
Purge Control Solenoid Valve Check 38.......
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM 39..............................
General Information 39......................
Operation 39................................
System Diagram 39.........................
Component Location 39......................
Exhaust Gas Recirculation (EGR) Control
System Check 40...........................
EGR Valve (Stepper Motor) Check 40........
EGR VALVE 42...........................
CANISTER 43............................
CATALYTIC CONVERTER 44..............
General Information 44......................
EMISSION CONTROL SYSTEM
<4D5> 45.............................
GENERAL INFORMATION 45..............
SERVICE SPECIFICATIONS 45............
SEALANT 45.............................
SPECIAL TOOL 45.......................
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM 46..............................
General Information 46......................
System Diagram 46.........................
Component Location 46......................
Function Check 47..........................
EGR Solenoid Valve Operation Check 47.....
EGR Solenoid Valve Resistance Check 48....
Lever Position Sensor (LPS) Adjustment 48...
Engine Speed Sensor Check 49..............
Engine Coolant Temperature Sensor
Check 49...................................
CHECK AT THE GLOW & EGR CONTROL
UNIT 51..................................
EMISSION CONTROL SYSTEM
<4M4-VEHICLES WITH EGR> 52........
GENERAL INFORMATION 52..............
SERVICE SPECIFICATIONS 52............
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM 53..............................
General Information 53......................
System Diagram 53.........................
Component Location 53......................
Function Check 54..........................
EGR Solenoid Valve Operation Check 54.....
EGR Solenoid Valve Resistance Check 55....
Accelerator Pedal Position Sensor (APS),
Engine Coolant Temperature Sensor, Intake
Air Temperature Sensor, Fuel Temperature
Sensor Check 55............................
Check at Engine-ECU 55....................
CATALYTIC CONVERTER 55..............
General Information 55......................


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ENGINE AND EMISSION CONTROL -Auto-cruise Control System17-10
METHOD OF ERASING THE DIAGNOSIS
CODES
Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points.
INSPECTION CHART FOR DIAGNOSIS CODES <6G7>
Code No.Diagnosis itemReference page
15Auto-cruise control switch system17-10
21Cancel latch signal system17-11
22Stop lamp switch system17-11
23Engine-ECU orengine-A/T-ECU system17-12
INSPECTION PROCEDURE FOR DIAGNOSIS CODES <6G7>
Code No. 15 Auto-cruise control switch systemProbable cause
This diagnosis code is output if the RESUME and SET switches of the auto-cruise
control switch remain on.DMalfunction of the auto-cruise control switch
DMalfunction of the connector
DMalfunction of the harness
DMalfunction of the throttle valve controller
Repair
Check the auto-cruise control switch. (Refer to P.17-29.)NG
Replace
OK
Check the following connectors:
D-205-3, D-205-2, D-205, E-10, D-11NG
Repair
NGCheck the harness between the auto-cruise control switch and
throttle valve controller.
NG
OK
Replace the throttle valve controller.
OK
Check trouble symptom.
Check trouble symptom.
NG


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ENGINE AND EMISSION CONTROL -Auto-cruise Control System17-11
Code No. 21 Cancel latch signal systemProbable cause
The throttle valve controller and engine-ECU or engine-A/T-ECU send
a cancelholding information to the engine-ECU or engine-A/T-ECU
via a cancel latch signal line and the serial communication line.
This diagnosis code is output if there is a failure in the cancel latch signal line, or
a disaccord in the communication data.DMalfunction of the connector
DMalfunction of the harness
DMalfunction of the throttle valve controller
DMalfunction of the engine-ECU
DMalfunction of the engine-A/T-ECU
Repair NG
RepairCheck the following connectors:
D-118, D-122, D-11NG
OK
Replace the throttle valve controller.
NG
NG
Check the harness between the throttle valve controller and engine-
ECU or engine-A/T-ECU .
Replace the engine-ECU or engine-A/T-ECU
Check trouble symptom.
OK
Check trouble symptom.
Check trouble symptom.NG
Code No. 22 Stop lamp switch systemProbable cause
This diagnosis code is output when the throttle valve controller detects a failure in
the stoplampswitch output.DMalfunction of the stoplampswitch
DMalfunction of the connector
DMalfunction of the harness
DMalfunction of the throttle valve controller
(2)NG
NG
Check the harness between the throttle valve connector and stop
lampswitch, and body earth, and repair if necessary.
NG
Repair
OK
Check trouble symptom.
Measure at the throttle valve controller connector D-11.
DDisconnect the connector and measure at the harness side.
(1) Voltage between terminal 25 and body earth
OK:0V (When brakepedal is not depressed.)
System voltage (When brakepedal is depressed.)
(2) Continuity between terminal 26 and body earth
OK:Continuity (When brakepedal is not depressed.)
No continuity (When brakepedal is depressed.)NO
Do the stop lamps illuminate normally?
OK
To the next page.
Check the following connectors:
D-136, D-26, D-33, E-13, D-128, D-11
D-136, D-124, E-13, D-128, D-11
OK
Check trouble symptom.
NG
Check the harness between the stoplampswitch and throttle valve
controller, and repair if necessary.NG
Repair
Check the stoplampcircuit.
YES
(1)NG
Check the following connectors:
D-136, D-26, E-10, D-11
D-136, D-124, E-10, D-11


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ENGINE AND EMISSION CONTROL -Auto-cruise Control System17-12
NG
Check the harness between the joint connector (4) and engine-ECU
or engine-A/T-ECU , and repair if necessary.
NG
Repair
OK
Check trouble symptom.
From the previous page.
OK
Check the following connectors:
D-128, D-63
D-128, D-122
OK
Check trouble symptom.
NG
Replace the throttle valve controller.NG
Measure at the engine-ECU connector D-117 or engine-A/T-
ECU connector D-122.
DDisconnect the connector and measure at the harness side.
DVoltage between terminal 63 and body earth or
voltage between terminal 123 and body earth
OK:0V (When brakepedal is not depressed.)
System voltage (When brakepedal is depressed.)
Code No. 23 Engine-ECU or engine-A/T-ECU
systemProbable cause
This diagnosis code is output if the engine-ECU or engine-A/T-ECU
system is defective as follows:
DCommunication error between the throttle valve controller and the engine-ECU

DCommunication error between the throttle valve controller and the engine-A/T-ECU

DMalfunction of the engine-ECU
DMalfunction of the engine-A/T-ECU
DMalfunction of the throttle position sensor
DMalfunction of the accelerator pedal positionsensor
DMalfunction of the throttle control servo
DMalfunction of the vehicle speed sensorDMalfunction of the engine-ECU
DMalfunction of the engine-A/T-ECU
MUT-
IISelf-Diag code
Confirm diagnosis code regarding the GDI system.Diagnosis
code outputCarry out the troubleshooting regarding the GDI system.
(Refer to GROUP 13A.)
No diagnosis code output
Check trouble symptom.


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ENGINE AND EMISSION CONTROL -Auto-cruise Control System17-13
INSPECTION CHART FOR DIAGNOSIS CODES <4M4>
Code No.Diagnosis itemReference page
15Auto-cruise control switch system17-13
22Stop lamp switch system17-14
23Engine-ECU system17-14
INSPECTION PROCEDURE FOR DIAGNOSIS CODES <4M4>
Code No. 15 Auto-cruise control switch systemProbable cause
This diagnosis code is output if the RESUME and SET switches of the auto-cruise
control switch remain on.DMalfunction of the auto-cruise control switch
DMalfunction of the connector
DMalfunction of the harness
DMalfunction of the engine-ECU
Repair
Check the auto-cruise control switch. (Refer to P.17-29.)NG
Replace
OK
Check the following connectors:
D-205-3, D-205-2, D-205, E-10, D-111NG
Repair
NGCheck the harness between the auto-cruise control switch and
engine-ECU.
NG
OK
Replace the engine-ECU.
OK
Check trouble symptom.
Check trouble symptom.
NG


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ENGINE AND EMISSION CONTROL -Auto-cruise Control System17-14
Code No. 22 Stop lamp switch systemProbable cause
This diagnosis code is output when the engine-ECU detects a failure in the stop
lampswitch output.DMalfunction of the stoplampswitch
DMalfunction of the connector
DMalfunction of the harness
DMalfunction of the engine-ECU
(2)NG
NG
Check the harness between the engine-ECU and stoplampswitch,
and body earth, and repair if necessary.
NG
Repair
OK
Check trouble symptom.
Measure at the engine-ECU connector D-111.
DDisconnect the connector and measure at the harness side.
(1) Voltage between terminal 39 and body earth
OK:0V (When brakepedal is not depressed.)
System voltage (When brakepedal is depressed.)
(2) Continuity between terminal 40 and body earth
OK:Continuity (When brakepedal is not depressed.)
No continuity (When brakepedal is depressed.)NO
Do the stop lamps illuminate normally?
OK
Check trouble symptom.
Check the following connectors:
D-136, D-26, D-33, E-13, D-128, D-111
D-136, D-124, E-13, D-128, D-111
OK
Check trouble symptom.
NG
Check the harness between the stoplampswitch and engine-ECU,
and repair if necessary.NG
Repair
Check the stoplampcircuit.
YES
(1)NG
Check the following connectors:
D-136, D-26, E-10, D-111
D-136, D-124, E-10, D-111 NG
Replace the engine-ECU.
Code No. 23 Engine-ECU systemProbable cause
This diagnosis code is output if the engine-ECU system is defective as follows:
DMalfunction of the engine-ECU
DMalfunction of the accelerator pedal positionsensor
DMalfunction of the GE actuator (electronic governor)
DMalfunction of the vehicle speed sensorDMalfunction of the engine-ECU
MUT-
IISelf-Diag code
Confirm diagnosis code regarding the diesel fuel system.Diagnosis
code outputCarry out the troubleshooting regarding the diesel fuel system.
(Refer to GROUP 13C.)
No diagnosis code output
Check trouble symptom.


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ENGINE AND EMISSION CONTROL -Auto-cruise Control SystemENGINE AND EMISSION CONTROL -Auto-cruise Control System17-15
INSPECTION CHART FOR TROUBLE SYMPTOMS <6G7>
Trouble symptomInspection
procedure No.Reference page
Communication with MUT-IIis not possible.117-15
Auto-cruise control isEven if brake pedal is depressed217-16
not cancelled.
Even if clutch pedal is depressed317-16
Even if select lever is set to N range417-17
Even if CANCEL switch is set to ON517-17
Auto-cruise control cannot be set.617-17
Hunting (repeated acceleration and deceleration) occurs at the set vehicle speed.717-18
When the MAIN switch of the auto-cruise control switch is turned ON, the
auto-cruise control indicator lamp does not illuminate. (However, the auto-cruise
control system is normal.)817-18
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS <6G7>
Inspection Procedure 1
Communication with MUT-II
is not possible.
Probable cause
If the MUT-
IIcan not also communicate with the systems other than the GDI system,
the diagnosis line circuit may be defective.
If the MUT-
IIcan not communication with only the GDI system and the auto-cruise
control system, the harness wire between the engine-ECU or engine-A/T-ECU
and the diagnosis connector, may be defective.
In addition, if the MUT-
IIcan not communication with only the auto-cruise control
system, the auto-cruise control switch may be defective.DMalfunction of the connector
DMalfunction of the harness
DMalfunction of the auto-cruise control switch
DMalfunction of the throttle valve controller
DMalfunction of the engine-ECU
DMalfunction of the engine-A/T-ECU
NORefer to GROUP 13A - Troubleshooting (Inspection procedure 2).
Can the MUT-
IIcommunicate with the other systems (except the
GDI system)?NORefer to GROUP 13A - Troubleshooting (Inspection procedure 1).
YES
Can the MUT-
IIcommunicate with the GDI system?
YES
Check the auto-cruise control switch input signal.
(Refer to Inspection Procedure 9, P.17-19.)


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