1999 MITSUBISHI LANCER EVOLUTION VI Condenser

MPI – General13-2
MULTIPOINT INJECTION (MPI)
GENERAL
OUTLINE OF CHANGE

The descriptions of the troubleshooting using an MUT-II tester have been added.

The fuel system and its management of EVOLUTION-VI are different from those of EVOLUTION-V
in the following items. Accordingly, the service procedures for these items are described herein. The
service procedures for the remaining item are the same as those for EVOLUTION-V.

Fan motor control

Fuel pump drive control

Fuel pump relay No.2

Fuel pump resistor

Actuator test function of MUT-II (The test of the following items has been made possible.)
a) Item No.36: Secondary air control solenoid valve
b) Item No.37: Air conditioner condenser fan (High)
c) Item No.38: Air conditioner condenser fan (Low)

MPI – Troubleshooting13-7
FAIL-SAFE FUNCTION REFERENCE TABLE
When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled
by means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning itemControl contents during malfunction
Air flow sensor1. Uses the throttle position sensor signal and engine speed signal (crank angle sensor
signal) to take reading of the basic injector drive time and basic ignition timing from
the pre-set mapping.
2. Fixes the ISC servo in the appointed position so idle control is not performed.
Intake air temperature
sensorControls as if the intake air temperature is 25C.
Throttle position
sensorNo increase in fuel injection amount during acceleration due to the throttle position sensor
signal.
Engine coolant
temperature sensor1. Controls as if the engine coolant temperature is 80C.
(This condition is maintained until the ignition switch is turned off even when the
sensor signal returns normal.)
2. Lets the fan motor (radiator and condenser) run at high speed.
Camshaft position
sensorInjects fuel to all cylinders simultaneously for 4 seconds.
(However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is not
detected at all.)
Barometric pressure
sensorControls as if the barometric pressure is 101 kPa.
Detonation sensorSwitches the ignition timing from ignition timing for super petrol to ignition timing for standard
petrol.
Ignition coil, power
transistor unitCuts off the fuel supply to cylinders with an abnormal ignition.
Alternator FR terminalDoes not control the output of the alternator according to an electrical load. (works as a
normal alternator)

MPI – Troubleshooting13-40
INSPECTION PROCEDURE 30
Fan motor relay system (Radiator fan, A/C condenser fan)
Probable cause
The engine-ECU turns on/off the built-in power transistor to control the fan motor
relay.
Malfunction of the fan motor relay

Malfunction of the fan motor

Improper connector contact, open or short-circuited
harness wire

Malfunction of engine-ECU
NG

Check the radiator fan circuit.

Check the A/C condenser fan circuit.
(Refer to Electrical Wirings.)
NG
Replace the engine-ECU.
OK
Check trouble symptom.
Measure at the engine-ECU connector B-59.

Disconnect the connector, and measure at the harness side.

Voltage between each of 20 and 21 and earth
(Ignition switch: ON)
OK:System voltage

Short the terminal 21 to earth.
(Ignition switch: ON)
OK:Fan operates at low speed.

Short the terminals 20 and 21 to earth.
(Ignition switch: ON)
OK:Fan operates at high speed.OKCheck the following connector: B-59NG
Repair

MPI – Troubleshooting13-41
INSPECTION PROCEDURE 30
Fan motor relay system (Radiator fan, A/C condenser fan)
Probable cause
The engine-ECU turns on/off the built-in power transistor to control the fan motor
relay.
Malfunction of the fan motor relay

Malfunction of the fan motor

Malfunction of thermostat

Improper connector contact, open or short-circuited
harness wire

Malfunction of engine-ECU
NG
Check the engine coolant temperature sensor. (Refer to P.13-10,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 21.)
OK
Replace the engine-ECU.
NG
MUT-II Data list
21 Engine coolant temperature sensor
OK:The engine coolant temperature agrees with the reading
of MUT-II when measured with the engine idling in warm
condition.OKCheck the thermostat.NG
Replace
OK
Check trouble symptom.
OK
Check the following connector: B-60NG
Repair NG
Check the A/C condenser fan circuit. (Refer to Electrical Wirings.)
NG
Measure at the engine-ECU connector B-60.

Disconnect the connector, and measure at the harness side.

Check the A/C condenser fan for operating condition.
(Ignition switch: ON)
OK:A/C condenser fan is stationary.

Voltage between each of 32 and 34 and earth
(Ignition switch: ON)
OK:System voltage

Short the terminal 32 to earth. (Ignition switch: ON)
OK:A/C condenser fan operates at high speed.

Short the terminal 34 to earth. (Ignition switch: ON)
OK:A/C condenser fan operates at low speed.
Check trouble symptom.
OK
OK
Check the following connector: B-59NG
Repair
Measure at the engine-ECU connector B-59.

Disconnect the connector, and measure at the harness side.

Check the radiator fan for operating condition.
(Ignition switch: ON)
OK:Radiator fan is stationary.

Voltage between each of 20 and 21 and earth
(Ignition switch: ON)
OK:System voltage

Short the terminal 20 to earth.
(Ignition switch: ON)
OK:Radiator fan operates at high speed.

Short the terminal 21 to earth.
(Ignition switch: ON)
OK:Radiator fan operates at low speed.NGCheck the radiator fan circuit. (Refer to Electrical Wirings.)

MPI – Troubleshooting13-62
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Drive contents Inspection
item
20Radiator
fan
(HIGH),
condenser
fan
(HIGH)*
1
Drive the fan
motors (for
radiator and
condenser*
1)

Ignition switch: ON

A/C switch: ON*1Fan motors
operate at high
speed.Procedure
No. 3013-40
21Radiator
fan
(LOW),
condenser
fan
(LOW)*
1
Drive the fan
motors (for
radiator and
condenser*
1)

Ignition switch: ON

A/C switch: ON*1Fan motors
operate at low
speed.
36*2Secondary
air control
solenoid
valveTurn solenoid
valve from
OFF to ON.Ignition switch: ONSound of opera-
tion can be heard
when solenoid
valve is driven.Procedure
No. 3613-46
37*2A/C con-
denser fan
(HIGH)Drive A/C
condenser fan
motorIgnition switch: ONA/C condenser
fan motor oper-
ates at high
speed.Procedure
No. 3013-41
38*2A/C con-
denser fan
(LOW)Drive A/C
condenser fan
motorIgnition switch: ONA/C condenser
fan motor oper-
ates at low speed.
NOTE
*1: EVOLUTION-IV and EVOLUTION-V
*2: EVOLUTION-VI

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)

55-1
HEATER,
AIR CONDITIONER
AND VENTILATION
CONTENTS
HEATER AND MANUAL AIR
CONDITIONER 3. . . . . . . . . . . . . . . . . . . . . .
GENERAL 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outline of Change 3. . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 3. . . . . . . . . . . . . .
LUBRICANTS 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 3. . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 4. . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 6. . . . . . . . . . . . . . . . . .
Refrigerant Charging 6. . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charging Amount Check 9. . . . . . . .
Replenishing System 10. . . . . . . . . . . . . . . . . . . . .
Discharging System 11. . . . . . . . . . . . . . . . . . . . . .
Performance Test 11. . . . . . . . . . . . . . . . . . . . . . . .
Dual Pressure Switch Simple Check 13. . . . . . .
Power Relay Check 13. . . . . . . . . . . . . . . . . . . . . .
Idle-up Operation Check 14. . . . . . . . . . . . . . . . . .
HEATER CONTROL ASSEMBLY AND A/C
SWITCH 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATER UNIT AND BLOWER UNIT
AIR CONDITIONER> 18. . . . . . . . . . . . . . . . . . .
HEATER UNIT, COOLING AND BLOWER
UNIT CONDITIONER> 19. . . . . . . . . . . . . . . . . . . . . . .
BLOWER MOTOR ASSEMBLY, RESISTOR
AND EVAPORATOR 20. . . . . . . . . . . . . . . . . . .
COMPRESSOR AND TENSION
PULLEY 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSER AND CONDENSER FAN 28. .
REFRIGERANT LINE 30. . . . . . . . . . . . . . . . . .
DUCTS 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTINUED ON NEXT PAGE

HEATER AND MANUAL AIR CONDITIONER – Troubleshooting55-4
TROUBLESHOOTING
TROUBLESHOOTING PROCEDURES
1. Check air ducts, control rods, etc. for improper connection.
2. Check that the electrical connectors of the relevant components are connected securely and the
fuse is not blown.
3. Perform the troubleshooting as follows; first understand the items to be inspected and the the procedures
comprehensively using Trouble Symptom/Failed Component Cross-Reference Table and then inspect
the appropriate items sequentially.
4. Be sure to perform each component check after disconnecting the relevant connector.
Trouble Symptom/Failed Component Cross-Reference Table
Items to be checked1.
When the igni-
tion switch is
“ON”, the A/C
does not oper-
ate.2.
When the A/C
is operating,
temperature
inside the pas-
senger
compartment
does not
decrease (cool
air is not
emitted).3.
Blower fan
motor does not
turn.4.
Blower fan
motor does not
stop turning.5.
When A/C is
operating,
radiator fan
and condenser
fan do not run.
Fuse111
Harness, connector2212
Amount of refrigerant31
A/C compressor relay4
A/C compressor magnet
clutch5
Dual pressure switch623
A/C switch7
Blower switch832
Blower relay4
Resistor53
Blower motor6
Air thermo-sensor93
Condenser fan relay44
Condenser fan motor55
Radiator fan relay (HI, LO)66
Radiator fan motor77
Refrigerant temperature
switch108
Auto compressor control
unit119
Engine-ECU12108