1999 MITSUBISHI LANCER EVOLUTION VI voltage

MPI – TroubleshootingMPI – Troubleshooting13-55
INSPECTION PROCEDURE 48
Check air flow sensor control circuit.
2, 3. NGCheck the following
connector: B-62NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and air flow sensor con-
nector.NG
Repair
OK
Replace the engine-ECU.
OK
Check trouble symptom.
NG
Replace the air flow sensor.
NG
Repair
OK
Check the following connector: A-25
Measure at the air flow sensor connector A-25.

Disconnect the connector and measure at the harness side.
1. Voltage between 4 and earth (Ignition switch: ON)
OK:System voltage
2. Voltage between 3 and earth (Ignition switch: ON)
OK:4.8–5.2 V
3. Continuity between 5 and earth
OK:Continuity1. NGCheck the harness wire between the air flow sensor and control
relay connector, and repair if necessary.
INSPECTION PROCEDURE 49
Check throttle position sensor output circuit.
Measure at the engine-ECU connector B-62.

Connect the connector.

Voltage between 84 and earth (Ignition switch: ON)
OK:0.3–1.0 V (Throttle valve at idle position)
4.5–5.5 V (Throttle valve fully open)NGCheck the following
connector: B-62NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
OK
Check the harness wire between engine-ECU and throttle position
sensor connector, and repair if necessary.
INSPECTION PROCEDURE 50
Check injector control circuit.
Measure at the engine-ECU connector B-59.

Disconnect the connector and measure at the harness side.

Voltage between 1, 2, 14, 15 and earth (Ignition switch: ON)
OK:System voltageNGCheck the following
connectors:
A-53, A-54, A-55, A-56NG
Repair
OK
Check trouble symptom.
NG
Check the harness between engine-ECU and injector connector,
and repair if necessary.
OK
Check the following connector: B-59
OK
Check trouble symptom.
NG
Replace the engine-ECU.NG
Repair

MPI – Troubleshooting13-57
Item
No.Inspection
itemInspection contentsNormal conditionInspection
procedure
No.Reference
page
14Throttle
position
Ignition switch: ONSet to idle position300 – 1,000 mVCode No.
14
13-9
position
sensor
Gradually openIncreases in
proportion to
throttle opening
angle
14
Open fully4,500 – 5,500 mV
16Power
supply
voltageIgnition switch: ONSystem voltageProcedure
No. 2413-35
18Cranking
signal Ignition switch: ONEngine: StoppedOFFProcedure
No. 2713-38
g
(ignition
switch-ST)Engine: CrankingON
21Engine
coolant
temperature
sensor
Ignition switch: ON or
with engine runningWhen engine
coolant temperature
is –20C–20CCode No.
2113-10
sensor
When engine
coolant temperature
is 0C0C
When engine
coolant temperature
is 20C20C
When engine
coolant temperature
is 40C40C
When engine
coolant temperature
is 80C80C

MPI – Troubleshooting13-58
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
22Crank angle
sensor
Engine: Cranking

Tachometer:
ConnectedCompare the engine
speed readings on
the tachometer and
the MUT-II.Accord––

Engine: Idling

Idle position
switch: ONWhen engine
coolant temperature
is –20C1,300 – 1,500 rpm
When engine
coolant temperature
is 0C1,300 – 1,500 rpm
When engine
coolant temperature
is 20C1,300 – 1,500 rpm
When engine
coolant temperature
is 40C1,150 – 1,350 rpm
When engine
coolant temperature
is 80C750 – 950 rpm
25Barometric
pressure
Ignition switch: ONAt altitude of 0 m101 kPaCode No.
25
13-14
pressure
sensor
At altitude of 600 m95 kPa
25
At altitude of 1,200 m88 kPa
At altitude of 1,800 m81 kPa
26Idle position
switchIgnition switch: ON
Check by operating
accelerator pedal
Throttle valve:
Set to idle positionONProcedure
No. 2613-38
accelerator pedal
repeatedly.)Throttle valve:
Slightly openOFF*
27Power
steering fluid
pressure
Engine: IdlingSteering wheel
stationaryOFFProcedure
No. 2813-39
pressure
switchSteering wheel
turningON
28A/C switchEngine: Idling
(when A/C switch isA/C switch: OFFOFFProcedure
No. 2913-39
(Ctc
ON, A/C compressor
should be operating.)A/C switch: ONON
NOTE
*: The idle position switch normally turns off when the voltage of the throttle position sensor is 50 –
100 mV higher than the voltage at the idle position. If the throttle position switch turns back on
after the throttle valve has opened, the idle position switch and the throttle position sensor need
to be adjusted.

MPI – Troubleshooting13-59
Item
No.Inspection
itemInspection contentsNormal conditionInspection
procedure
No.Reference
page
41Injectors*1
TION-IV>Engine: CrankingWhen engine
coolant temperature
is 0C (injection is
carried out for all
cylinders
simultaneously)27 – 41 ms––
When engine
coolant temperature
is 20C14 – 22 ms
When engine
coolant temperature
is 80C3.9 – 5.9 ms
Injectors*2
TION-IV>

Engine coolant
temperature:
80–95C
Engine is idling1.2 – 2.4 ms
TION-IV>80–95C

Lamps, electric
cooling fan and all
accessories: OFF
2,500 r/min1.0 – 2.2 ms
accessories: OFF

Transmission:
Neutral (A/T :
P range)When engine is
suddenly racedIncreases
41Injectors*1
TION-V, VI>Engine: CrankingWhen engine
coolant temperature
is 0C27 – 40 ms––
When engine
coolant temperature
is 20C14.5 – 21.7 ms
When engine
coolant temperature
is 80C3.8 – 5.6 ms
Injectors*2
TION-V VI>

Engine coolant
temperature:
80–95C
Engine is idling0.9 – 2.1 ms
TION-V, VI>80–95C

Lamps, electric
cooling fan and all
accessories: OFF
2,500 r/min0.7 – 1.9 ms
accessories: OFF

Transmission:
Neutral (A/T :
P range)When engine is
suddenly racedIncreases
NOTE
*1: The injector drive time represents the time when the cranking speed is at 250 r/min or below when
the power supply voltage is 11 V.
*
2: In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10%
longer than the standard time.

MPI – Troubleshooting13-63
ENGINE-ECU INSPECTION
TERMINAL VOLTAGES
Engine ECU connector
Terminal
No.Check itemCheck condition (Engine condition)Normal condition
1No.1 injectorWhile engine is idling after having been warmed up,
suddenly depress the accelerator pedal
Momentarily drops
slightlyfrom 1114V
14No.2 injector
suddenly depress the accelerator pedal.slightly from 11 – 14 V.
2No.3 injector
15No.4 injector
3Fuel pressure control
valve
Ignition switch: ONSystem voltage
valve
Engine: Cranking to idling (within about two minutes)0 – 3 V to sytem
voltage
4Stepper motor coil (A1)Engine: Immediately after engine has been started
f
or warming up
Changes repeatedly
f
rom system voltage
17Stepper motor coil (A2)
for warming upfrom system voltage
to 0 – 6 V and from 0
6 V to system5Stepper motor coil (B1)– 6 V to system
voltage.
18Stepper motor coil (B2)
6Secondary air control
solenoid valveIgnition switch: ONSystem voltage
8Fuel pump relayIgnition switch: ONSystem voltage
Engine: Idling0 – 3 V
10Power transistor unit
(A)Engine speed: 3,000 r/min0.3 – 3.0 V
23Power transistor unit
(B)
11Wastegate solenoid
valve
Ignition switch: ONSystem voltage
valve
Engine: At idle after having been warmed up (when
premium gasoline is used)0 – 3 V
12Power supplyIgnition switch: ONSystem voltage
25
19Air flow sensor reset
signal
Engine: Idling0 – 1 V
signal
Engine speed: 3,000 r/min6 – 9 V
20Fan motor relay (HI)
Fan not operating (coolant temperature: 90C or
below)System voltage
Fan at high speed (coolant temperature: 105C or
above)0 – 3 V

MPI – Troubleshooting13-64
Terminal
No.Normal condition Check condition (Engine condition) Check item
20Radiator fan motor
relay (HI)

Radiator fan not operating (coolant temperature:
95C or below)System voltage
Radiator fan at high speed (coolant temperature:
105C or above)0 – 3 V
21Fan motor relay (LOW)
Fan not operating (coolant temperature: 95C or
below)System voltage
Fan at low speed (coolant temperature: 95 – 100C)0 – 3 V
21Radiator fan motor
relay (LOW)

Radiator fan not operating (coolant temperature:
95C or below)System voltage
Radiator fan at low speed (coolant temperature: 95
– 105C)0 – 3 V
22A/C relay
Engine: Idling

A/C switch: OFF to ON (Compressor is being
driven.)System voltage, or 6
V or more instanta-
neously to 0 – 3 V
32A/C condenser fan
motor relay (HI)

A/C condenser fan not operating (A/C switch: ON,
coolant temperature: 105C or below)System voltage
A/C condenser fan at high speed (A/C switch: ON,
coolant temperature: 105C or above)0 – 3 V
33Alternator G terminal
Engine: Warm, idle (radiator fan: OFF)

Headlamp: OFF to ON

Brake lamp: OFF to ON

Rear defogger switch: OFF to ONVoltage rises by 0.2 –
3.5 V.
34A/C condenser fan
motor relay (LOW)

A/C condenser fan not operating (A/C switch: OFF,
coolant temperature: 105C or below)System voltage
A/C condenser fan at low speed (A/C switch: OFF,
coolant temperature: 105C or above)0 – 3 V
36Engine warning lampIgnition switch: OFF → ON0 – 3 V → System
voltage (After several
seconds have
elapsed)
37Power steering fluid
pressure switchEngine: Idling after
warming upWhen steering wheel is
stationarySystem voltage
When steering wheel is
turned0 – 3 V
38Control relayIgnition switch: OFFSystem voltage
Ignition switch: ON0 – 3 V
39Fuel pump relay No.2While engine is idling, suddenly depress the
accelerator pedal.Momentarily rises
slightly from 0 to 3 V.
40Exhaust temperature
warning lampIgnition switch: OFF to ON0 – 3 V to system
voltage (After several
seconds have
elapsed)

MPI – Troubleshooting13-65
Terminal
No.Normal condition Check condition (Engine condition) Check item
41Alternator FR terminal
Engine: Warm, idle (radiator fan: OFF)

Headlamp: OFF to ON

Brake lamp: OFF to ON

Rear defogger switch: OFF to ONVoltage drops by 0.2 –
3.5 V.
45A/C switchEngine: Idle speedTurn the A/C switch OFF0 – 3 V
Turn the A/C switch ON
(A/C compressor is oper-
ating)System voltage
60Oxygen sensor heater

Engine: Idling0 – 3 V

Engine speed: 5,000 r/minSystem voltage
71Ignition switch-STEngine: Cranking8 V or more
72Intake air temperature
sensorIgnition switch: ONWhen intake air tempera-
ture is 0C3.2 – 3.8 V
When intake air tempera-
ture is 20C2.3 – 2.9 V
When intake air tempera-
ture is 40C1.5 – 2.1 V
When intake air tempera-
ture is 80C0.4 – 1.0 V
76Oxygen sensorEngine: Running at 2,000 r/min after having been
warmed up (Check using a digital type voltmeter)0 ↔ 0.8 V
(Changes repeatedly)
80Backup power supplyIgnition switch: OFFSystem voltage
81Sensor impressed
voltageIgnition switch: ON4.5 – 5.5 V
82Ignition switch-IGIgnition switch: ONSystem voltage
83Engine coolant
temperature sensorIgnition switch: ONWhen engine coolant
temperature is 0C3.2 – 3.8 V
When engine coolant
temperature is 20C2.3 – 2.9 V
When engine coolant
temperature is 40C1.3 – 1.9 V
When engine coolant
temperature is 80C0.3 – 0.9 V
84Throttle position sensorIgnition switch: ONSet throttle valve to idle
position0.3 – 1.0 V
Fully open throttle valve4.5 – 5.5 V
85Barometric pressure
sensor
Ignition switch: ONWhen altitude is 0 m3.7 – 4.3 V
sensor
When altitude is 1,200 m3.2 – 3.8 V
86Vehicle speed sensor
Ignition switch: ON

Move the vehicle slowly forward0 ↔ 5 V
(Changes repeatedly)

MPI – On-vehicle Service13-68
ON-VEHICLE SERVICE
FUEL PUMP RESISTOR CHECK

Standard value: 0.45 – 0.65 Ω
The inspection procedures are the same as for the preceding
year-models.
FUEL PUMP RELAY No.2 CONTINUITY CHECK

Battery voltageTerminal No.
1234
Not supplied
Supplied
ENGINE CONTROL RELAY AND FUEL PUMP
RELAY CONTINUITY CHECK
Battery voltageTerminal No.
1234
Not supplied
Supplied
Equipment side connector for engine
control relay and fuel pump relay
Fuel pump relay
Engine control relay