Mitsubishi Lancer Evolution 7. Manual — part 188
MPI -
Troubleshooting
13A-51
Code No.P1610 Immobilizer system <Europe and
General Export-spec. models>
Probable cause
Inspection Range
D
Ignition switch: ON
Set Conditions
D
Improper communication between the engine-ECU and the immobilizer-ECU
D
Open or short circuit, or loose connector contact
D
Malfunction of the immobilizer-ECU
D
Malfunction of the engine-ECU
NOTE
(1) If the registered ignition keys are close each other when starting the engine, radio interference may
cause this code to be displayed.
(2) This code may be displayed when registering the key encrypted code.
NG
Replace the engine-ECU.
Check the trouble symptoms.
NG
Replace the immobilizer-ECU
OK
Check the trouble symptoms.
OK
Check the harness wire between the
immobilizer-ECU and the
engine-ECU, and repair if necessary.
NG
Replace
Check the following connectors:
C-202, C-130, C-118
NG
Repair
MPI -
Troubleshooting
13A-52
INSPECTION CHART FOR TROUBLE SYMPTOMS
Inspection
procedure
Check items
Reference page
1
Communication between MUT-II and entire system is not possible.
13A-54
2
Only communication between MUT-II and engine-ECU is not possible.
13A-55
3
Engine warning lamp does not illuminate immediately after ignition switch is set to ON position.
13A-56
4
Engine warning lamp stays illuminated and does not turn OFF.
13A-57
5
Starting disabled (Starter does not rotate.)
13A-58
6
Starting disabled (Starter rotates but initial combustion does not occur.)
13A-59
7
Starting disabled (Initial combustion occurs but is incomplete.)
13A-61
Improper starting (Starting time is long.)
8
Unstable idling (Rough idling, hunting)
13A-63
Inappropriate idling speed (High or low idling speed)
Engine stalls (Die out) during idling
9
Engine stalls when starting travel. (Pass out)
13A-66
10
Engine stalls during deceleration
13A-67
11
Pulsation (Hesitation, sag)
13A-68
Poor acceleration
Stumbling
Surging
12
Shock during acceleration
13A-70
13
Shock during deceleration
13A-71
14
Knocking
13A-72
15
Deviation of ignition interval
13A-73
16
Run on (Dieseling)
13A-74
17
Abnormal odor, white smoke, black smoke, high CO or HC concentration when idling
13A-75
18
Battery dies
13A-77
19
Overheating
13A-79
20
Abnormal radiator fan motor rotation
13A-80
21
A/C ineffective
13A-81
22
Engine-ECU power supply, engine control relay, ignition switch-IG1 system
13A-82
23
Fuel pump system
13A-85
24
Radiator fan control relay system
13A-87
25
Condenser fan relay system
13A-89
26
A/C switch system
13A-92
27
A/C compressor relay system
13A-93
28
A/C load signal system
13A-95
29
Secondary air control solenoid valve system
13A-96
30
Intercooler water spray circuit system
13A-97
31
Intercooler water spray lamp system
13A-99
32
Ignition coil (integrated power transistor) system
13A-100
MPI -
Troubleshooting
Fig. 1
Vehicle
speed
Initial ac-
celerator
pedal de-
pression
Normal
Hesitation
Sag
Time
Fig. 2
Normal
Initial ac-
celerator
pedal de-
pression
Idling
Stumble
Time
Vehicle
speed
13A-53
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Items
Symptom
Starting
Won’t start
The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won’t start.
Fires up and dies
There is combustion within the cylinders, but then the engine soon stalls.
Hard starting
Engine starts after cranking a while.
Idling
stability
Hunting
Engine speed doesn’t remain constant; changes at idle.
stability
Rough idle
Usually, a judgement can be based upon the movement of the tachometer
pointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
This is called rough idle.
Incorrect idle speed The engine doesn’t idle at the usual correct speed.
Engine stall
(Die out)
The engine stalls when the foot is taken from the accelerator pedal, regardless
of whether the vehicles is moving or not.
Engine stall
(Pass out)
The engine stalls when the accelerator pedal is depressed or while it is being
used.
Driving
Hesitation Sag
“Hesitation” is the delay in response of the vehicle speed (engine speed) that
occurs when the accelerator is depressed in order to accelerate from the speed
at which the vehicle is now traveling, or a temporary drop in vehicle speed
(engine speed) during such acceleration.
Serious hesitation is called “sag”. (Refer to Fig. 1)
Poor acceleration
Poor acceleration is inability to obtain an acceleration corresponding to the
degree of throttle opening, even though acceleration is smooth, or the inability
to reach maximum speed.
Stumble
Engine speed increase is delayed when the accelerator pedal is initially
depressed for acceleration. (Refer to Fig. 2)
Shock
The feeling of a comparatively large impact or vibration when the engine is
accelerated or decelerated.
Surge
This is repeated surging ahead during constant speed travel or during variable
speed travel.
Knocking
A sharp sound like a hammer striking the cylinder walls during driving and which
adversely affects driving.
Stopping
Run on
(“Dieseling”)
The condition in which the engine continues to run after the ignition switch is
turned to “LOCK” (OFF) position. Also called “Dieseling”.
MPI -
Troubleshooting
13A-54
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication between MUT-II and entire system is not
possible.
Probable cause
Causes shown on right are suspected.
D
Diagnosis connector malfunction
D
MUT-II malfunction
Check and repair the harness between
the diagnosis connector and body
earth.
D
Check for damage of the earth
cable.
OK
OK
Check the harness between the
diagnosis connector and battery.
D
Check for damage of the power
cable.
NG
Repair
NG
Check the following connectors:
C-213, C-211, C-132, C-35 <L.H.
drive vehicles>
NG
Repair
Check the trouble symptoms.
OK
End
OK
Replace the MUT-II.
OK
Check and repair the harness between
the diagnosis connector and battery.
D
Check for disconnection and
short-circuit of the power cable.
(2) NG
Check the following connectors:
C-213, C-211, C-132, C-35 <L.H.
drive vehicles>
NG
Repair
Check and repair the harness between
the diagnosis connector and body
earth.
D
Check for disconnection and
damage of the earth cable.
OK
Measure at the C-22 diagnosis
connector.
D
Disconnect the connector to
measure at the harness side.
(1) Resistance between terminal No. 4
and earth
Resistance between terminal No. 5
and earth
OK: 2 Ω or less
(2) Voltage between terminal No. 16
and earth
OK: System voltage
(1) NG
Check the following connector:
C-22
NG
Repair
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