Mitsubishi Lancer Evolution 8. Manual — part 162
MPI – TROUBLESHOOTING
13A-34
ITEMS
Fault Symptoms
Checking
procedures
No communication between MUT-II/III and any other system
1
Communicatio
n with MUT
II/III
Only MUT-II/III and Engine ECU can communicate
2
The engine warning light does not come on immediately after turning ignition switch to
“ON “ position
3
Engine
warning light
Engine warning light remains lit. Does not go off.
4
Starting not possible (starter does not
turn over)
Starter does not function
5
Starting not possible
(starter turns over but no initial firing)
Starter functions and cranks, but there is no
combustion inside cylinders and engine does
not start
6
Starting not possible (fires, but not
fully)
Combustion in cylinders, but engine stalls
immediately
Starting
Poor starting (starting takes a long
time)
Engine starts, but cranking takes a long time
7
Irregular idling
(rough idling, hunting)
During idle running, engine speed fluctuates.
This can normally be seen in the tachometer
needle swinging, and vibrations felt through
the steering wheel, gear stick, and body
Incorrect idling speed
Does not idle at correct speed
Poor idling
Engine stalls when idling
(dies out)
During idling, the engine stalls irrespective of
whether the vehicle is moving
8
Engine stalls when pulling away from
standing (‘pass out’)
When vehicle is idling and throttle pedal is
depressed, or during operation, engine stalls
9
Engine stall
Engine stalls during deceleration
Engine stalls when decelerating.
10
Pulsating/discontinuous combustion
(hesitation, sag)
When throttle pedal is depressed in order to
accelerate from certain speeds, vehicle
response (engine speed) is delayed.
Furthermore, during acceleration, (engine
speed) drops momentarily.
These symptoms are generally referred to as
‘hesitation’. Severe hesitation is referred to as
‘sag’
Poor acceleration
Driving at steady speeds is smooth, but when
accelerating, the rate of acceleration does not
respond to increased throttle. So highest
speeds are not reached
Stumble
When pulling away from standing, engine
speed responds slowly to initial throttle pedal
movement
Surge
Driving at steady speeds, or when
accelerating, the vehicle repeatedly jerks
backwards and forwards
11
Acceleration shock
A major shock is generated on acceleration
12
Deceleration shock
A major shock is generated on deceleration
13
Knocking
Thudding noise like a dull hammering comes
from cylinder walls during driving, resulting in
rough driving.
14
Driving
Ignition mistiming
Discrepancy between firing timing and
standard values specified for timing.
15
Stopping
Run-on
(dieseling/pinking)
Engine continues to run after ignition switch is
turned to “LOCK” (OFF) position.
16
Exhaust fumes
Smelly, white smoke, black smoke
CO and HC densities are high when
idling
Exhaust fumes smell unusually strong.
Exhaust is white or black. CO and HC
densities are high when idling
17
Charging
Flat battery
Battery loses its charge immediately.
Or battery charging capacity is low
18
Overheating
Engine cooling water temperature unusually
high
19
Cooling
Radiator fan motor running abnormallyIrrespective of engine cooling water
temperature, when ignition switch is turn to
the ON position, the fan motor starts running
20
A/C
performance
A/C not effective
Air not cooled down. Or there is a
discrepancy with temperature set.
21
4. List of Fault Symptoms
MPI – TROUBLESHOOTING
13A-35
Check
procedures
Check Items
Page
1
No communication between MUT-II/III and any other system
13A-36
2
Only MUT-II/III and Engine ECU can communicate
13A-37
3
The engine warning light does not come on immediately after turning ignition switch to
“ON “ position
13A-38
4
Engine warning light remains lit. Does not go off.
13A-39
5
Starting not possible (starter does not turn over)
13A-40
6
Starting not possible (starter turns over but no initial firing)
13A-42
Starting not possible (fires, but not fully)
7
Poor starting (starting takes a long time)
13A-44
Irregular idling (rough idling, hunting)
Incorrect idling speed
8
Engine stalls when idling (dies out)
13A-46
9
Engine stalls when pulling away from standing (‘pass out’)
13A-49
10
Engine stalls during deceleration
13A-50
Pulsating/discontinuous combustion (hesitation, sag)
Poor acceleration
Stumble
11
Surge
13A-50
12
Acceleration shock
13A-52
13
Deceleration shock
13A-53
14
Knocking
13A-53
15
Ignition mistiming
13A-54
16
Run-on (dieseling/pinking)
13A-55
17
Smelly, white smoke, black smoke
CO and HC densities are high when idling
13A-55
18
Flat battery
13A-57
19
Overheating
13A-58
20
Radiator fan motor running abnormally
13A-59
21
A/C not effective
13A-60
22
Engine ECU power supply, engine control relay, ignition switch – IG1 system
13A-61
23
Fuel pump system
13A-63
24
Radiator fan control relay system
13A-65
25
Condenser fan control relay system
13A-67
26
A/C switch system
13A-70
27
A/C compressor relay
13A-71
28
A/C load signal system
13A-73
29
Power steering fluid pressure switch system
13A-74
30
Purge solenoid valve system
13A-75
31
Fuel pressure control solenoid valve system
13A-76
32
Secondary air control solenoid valve
13A-77
33
Waste gate solenoid valve system
13A-78
34
Idle speed control (ISC) servo (stepper motor) system
13A-79
35
Intercooler water spray circuit system
13A-80
36
Intercooler water spray lamp system
13A-82
4-1. List of Fault Symptoms
MPI – TROUBLESHOOTING
13A-36
6. Checking Procedure for each Fault
Checking Procedure 1
Check connector C-122
C-122 Diagnosis connector
measurement
• Undo connector, then take
measurement on harness side
(1) Resistance across 4 - earth
Resistance across 5 - earth
OK: 2
Ω
or less
(2) Voltage across 16 - earth
OK: Battery voltage
Check and repair harness between
diagnosis connector and body earth
• Check for broken or damaged earth
wire
Check connectors C212, C211, C-32
Check and repair harness between
diagnosis connector and body earth
• Check to see if power supply cable is
broken or has short circuit
Replace MUTII/III
Confirm fault symptoms
Check connectors C212, C211,
C-32
Check harness between
diagnosis connector and battery
• Check for damage to power
supply cable
Check connector C-107
Check and repair harness
between diagnosis connector and
body earth
• Check for damage to earth wire
No Communication between MUT-II/III and any other system
Probable causes
The probable causes are noted right.
• Diagnosis connector malfunction
• MUT-II/III malfunction
OK
Repair
Finish
Repair
Repair
NG
(1) NG
(2) NG
OK
OK
OK
NG
NG
NG
NG
OK
OK
OK
NG
Repair
MPI – TROUBLESHOOTING
13A-37
Checking Procedure 2
Confirm engine warning light
• Ignition switch: ON
OK: Engine warning lamp lit
Check connectors C-110, C-12
<vehicles fitted with MMCS>
C-22, C-23, C-51, C-122
Check harness between
diagnosis connector and engine
ECU
• Check for damage, short
circuits, or damage to
communication wiring
Confirm fault symptoms
Replace engine ECU
Checking procedure 22: Check
engine ECU power supply, engine
control relay, ignition switch-IG1
system (ref. P.13A-65)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Only MUT-II/III and engine ECU can communicate
Probable causes
The probable causes are noted right.
• Ignition switch malfunction
• Engine control relay malfunction
• Engine ECU malfunction
NG
NG
NG
OK
OK
OK
OK
NG
Repair
Repair
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст