1990 MITSUBISHI SPYDER oil temperature

ENGINE (NON-TURBO)> General
FUEL INJECTION
ENGINE (NON-TURBO)>
GENERAL INFORMATION
The Fuel Injection System consists
of sensors which detect the engine conditions,
the POWERTRAIN CONTROL MODULE(PCM) which controls the system based on
signals from these sensors, and actuators
which operate under the control of the PCM.
FUEL INJECTION CONTROL
The injector drive times and injector timing are
controlled so that the optimum air/fuel mixture
is supplied to the engine to correspond to the
continually-changing engine operation condi-
tions.
A single injector is mounted at the intake port
of each cylinder. Fuel is sent under pressure
from the fuel tank by the fuel pump, with the
pressure regulated by the fuel pressureregulator. The regulated fuel is distributed
to each of the injectors. Fuel injection is normally carried out once for
each cylinder for every two rotations of the
crankshaft. The firing order is
This
IDLE AIR CONTROL The idle speed’ is kept at the optimum speed
by controlling the amount of air that bypasses
the throttle valve in accordance with changes in idling conditions and engine load during
idling.
The PCM drives the idle air control (IAC) motor
to keep the engine running at the idle
target speed in accordance with the engine
IGNITION TIMING CONTROL
The ignition power transistor is built into the
PCM. It turns the ignition primary circuit on
and off to respectively supply and cut off primary
current flow to the ignition coil. The PCM carries
activities such fuel
injection control, idle air control and ignition
timing control.
In addition, the
diagnostict e s twhich simplify
troubleshooting when a problem develops.
is called The PCM
air/fuel mixture by carrying out “open-loop”
control when the engine is cold or operating
under high load conditions in to maintain
engine performance.
In addition, when the engine warm or
operating under normal
the PCM
controls the air/fuel mixture by using the heated
oxygen sensor signal to carry out “closed-loop”
control in order to obtain the theoretical air/fuel
mixture ratio that provides the maximum
cleaning
from the three way
catalyst.
coolant temperature and air conditioning load.
In addition, when the air conditioning switch
is turned off and on while the engine is idling,
the
motor operates to adjust the throttle
valve bypass air amount in accordance with
the engine load conditions in order to avoid
fluctuations in the engine speed.
This controls the ignition timing in order to
provide the optimum ignition timing with respect
to the engine operating conditions. The ignition
timing is determined by the PCM from the
engine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
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Service ENGINE (NON-TURBO)> Sealants
SERVICE SPECIFICATIONS
Ignition timing
Curb idle
Idle speed when is ON
Standard value
BTDC. at curb idle (Nonadjustable)-
800 100
850 in Neutral
Throttle position sensor resistance,
Idle air control motor coil resistance
Intake air temperature sensor resistance
Engine coolant temperature sensor
Heated oxygen sensor output voltage
Fuel pressure (psi)
Injector coil resistance
Electric EGR transducer solenoid coil resistance
3 . 5 8 . 5 ,
9 - 1 1
0.6 0.8
9-11 ,
0.6 0.8
0.6
1.0
330
350 (47 50) at curb idle
25 35 (68
SEALANTS
Items
Engine coolant temperature sensor threaded portion
Intake air temperature sensor threaded portion
,Specified sealants
Loctite 24200 or equivalent.
Loctite 24200 or equivalent
.
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ENGINE (NON-TURBO)>
TEST MODE
CHECK ENGINE/MALFUNCTION INDICATOR LAMP
As a functional test, the Malfunction Indicator Lam p
illuminates at key-on before engine cranking.
Whenever the Power-train Control Module (PCM) sets a
diagnostic trouble code that effects vehicle emissi ons, it
illuminates the
The PCM illuminates the for
diagnostic trouble codes that effect vehicle emissi ons. The
remains on until the diagnostic trouble code is erased.
The
either flashes or illuminates continuously when
PCM detects active engine misfire.
During active misfire, thePCM records the
operating conditions. The engine operating conditio ns
recorded by the PCM.
ItemsIndicated by the Check Engine/Malfunction Indicator Lamp
DTC No. Items
01No cam signal at PCM
02Internal controller failure
EGR solenoid circuit
EVAP solenoid circuit
Injector control circuit
20Injector control circuit
21Injector control circuit
25Idle air control motor circuit
26Throttle position sensor voltage low
27Throttle position sensor voltage high
30Engine coolant temperature voltage too low
31Engine coolant temperature voltage too high
32Upstream stays at center
35
No vehicle speed sensor signal
36
07) MAP sensor voltage too low
37MAP sensor voltage too high
39No change in MAP from start to run
42Ignition coil primary circuit
43Ignition coil primary circuit
46
EGR system failure
57Intake air temperature sensor voltage low
58Intake air temperature sensor voltage high
61Injector control circuit
62Upstream shorted to voltage
68PCM failure communications
71 temperature volts out of limit
, .
,
92 (PI 490)
93
101
33)
103
Low speed fan control relay circuit
High speed fan control relay circuit
Fuel pump relay control circuit
Upstream
response
Upstream
heater failure
Downstream
heater failure
Multiple cylinder misfire
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ENGINE (NON-TURBO)>
1MemoryDiagnostic itemsCheck items (Remedy)
Engine coolantHarness and
temperature sensorEngine coolant temper
voltage too low
ature sensor
Engine coolantlHarness
temperature sensorl Engirie coolant temper
voltage too high sensor
Upstream staysl Harness and
at centerl Upstream
Engine is cold too longl Engine coolant temper
ature sensor
connectorlEngine coolant
sensor
Thermostat
No vehicle speed
lHarness and
sensor signallVehicle speed sensor
MAP sensor voltagelHarness
too low (If harness connec-
tor are not defective, replace
sensor.)
MAP sensor voltagel Harness and connector
t o o h i g h
(If harness and connec-
tor are not defective,
replace MAP sensor.)
No
in MAPl Harness and connector
from start to run (If harness and connec-
tor are defective,
replace MAP sensor.)
No crankshaftl Harness and connector
reference signal at (If harness and
tor are’ not defective,
replace crankshaft posi-
tion sensqr.)
gnition coil
primaryl Harness and connector
Ignition coil
gnition coil primaryl Harness and connectorlIgnition coil
relay (ASDl connector
ay) output voltage atl relay (ASD relay)
‘CM
system failurel Harness and connector
lElectric EGR transducer
solenoid
l v a l v e
l EGR tube clogged
l Vacuum hoses
DTC NC
pulses
mode>
DTC No. DTC No. tool (MUT-II)scan toolmode>mode>
30
31
32 34
1
I
I
I
I
Retained22
22
,
I
I
I
Retained
Retained
21
17
15
14
14
33
35Retained
36Retained
Retained
13Retained
11
6
MIL: Check engine/Malfunction Indicator Lamp (MIL)
The number shown represents the number of pulses observedatthe MIL.
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ENGINE
Scan tool 92
C o d e G e n e r a l s c a n t o o l L o w S p e e d F a n
No.Circuit, 35,
[Comment]l Relay coil open or shortedBackgroundlThe low speed radiator fan relay controls the low of the radiator fan. l
Ignition switch output circuit openOne side of the relay control coil is supplied with 12 volts when the ignition switch isl
Low speed radiator fan l o r turned to the ON position.
l The circuit is completed when the other side of the relay coil is grounded by the PCM.l .
lThe PCM grounds the relay control circuit depending
on engine coolant temperature etc. . . Range of Checkl
Battery voltage: 10 or morel Ignition switch: ONSet ConditionlAn open or short-circuit condition is detected in t he low speed radiator fan relay controlcircuit for 3 seconds.
NGMeasure at the PCM connector Check the radiator fan relay drcuit.lDisconnect the connector, and measure at the harnes s side.
l Voltage between 55 and ground
(ignition switch: ON)
OK: Battery positive voltage
l Connect a jumper wire between 55 and ground.
(Ignition switch: ON)
OKRadiator fan runs at low speed.
OKNG Repair
OK
Check trouble symptom.
Replace the PCM.
NG
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ENGINE
Scan tool 93
Code General scan tool High Speed Fan
No.Control Relay Circuit
35
[Comment]
Background
lThe high speed condenser fan relay controls the hig h speed operation of the condenserfan.lOne side of the relay control coil is supplied with 12 volts when the ignition switch is
turned to the ON position.
lThe circuit is completed when the other side of the relay coil is grounded by the PCM.lThe PCM grounds the relay control circuit depending on engine coolant temperature and
other conditions.
Range of Check
l Battery voltage:
or more Ignition switch: ONSet ConditionAn open or shorted condition is detected in the hig h speed condenser fan relay controlcircuit for 3 seconds.
lRelay, coil open, shorted . ..
lHigh speed condenser fan relay control circuito p e n PCM failed
Measure at the PCM connector lDisconnect the connector, and measure at the harnes s side.Check the condenser fan circuit.
l Voltage between 19 and ground
(Ignition switch: ON)
OK: Battery positive voltage
l Connect a jumper wire between 19 and ground.
(Ignition switch: ON)
OK A/C condenser fan runs at high speed.
OK. . . . NG RepairCheck the following connector: IOK
Check trouble symptom.
Replace the PCM.
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ENGINE (NON-TURBO)>
Scan tool 106
Code General scan tool
No.Multiple Cylinder Mlsfire
43
[Comment]Background
l Excessive engine misfire results in increased catal yst temperature.
l Severe misfire could cause catalyst damage.
l To prevent catalytic converter damage, the PCM moni tors engine misfire.
l The PCM monitors for misfire during most engine ope rating conditions.
lWhen a misfire is detected, the PCM stores a diagnostic trouble code and causes the to either flash or illuminate continuously during active misfire.
Range of Check
l MAP voltage is less than 1.60
l Engine speed is between 2200 and 2800 l Engine coolant temperature is greater than l Vehicle speed less than Set Condition
l 1000 Rev Misfire
The PCM detects misfire in more than 1.6% of the en gine cycles in a 1000 revolution
period.l 200 Rev MisfireThe PCM detects misfire in more than 15% of the eng ine cycles in a 200 revolution period.
.
Spark plugs or wires failed
l Ignition coil failed
l Crankshaft position piston rings v a l v e s
l Head gasket failed
l C r a c k e d
l Fuel lines and filter failed
l Fuel failed
l failed
l Wiring and connectors failed
l Engine coolant
l Timing belt tooth broken,
l EGR
SCAN TOOL SENSOR READ TESTS (Data list)
05 Engine coolant temperature sensor (Refer to Check the engine coolant temperature circuit.
(Refer to INSPECTION PROCEDURE 38.)
OK
SCAN TOOL SENSOR READ TESTS (Data list)
27 Intake air temperature sensor (Refer to
OK
Check the intake air temperaturecircuit.(Refer to INSPECTION PROCEDURE
SCAN TOOL SENSOR READ TESTS (Data list)
11 MAP sensor reading (Refer to
OK
OK
Check the MAP sensor circuit.(Refer to INSPECTION PROCEDURE 40.)
SCAN TOOL SENSOR READ TESTS (Data list)
Check the following connectors: 66 Oxygen sensor volts (front) (Refer to OK: Repeat and alternately whenidling.
Check the fuel pressure. (Refer to Check the harness wire between the PCM and the cran kshaft
position sensor connector.
l Check the injectors for operation sound.
l Check the injectors for fuel leakage.
l Check the evaporative emission control system.
Check the following items.
l Check the ignition coil, spark plug cables.
l Check the compression pressure.
Check the EGR
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ENGINE Troubleshooting .
Scan tool 138
Code General scan tool
No. Not
25
[Comment]Range of Check
l Engine:
l Vehicle at rest and the brake appliedSet Conditionl speed differs from target idle by 200 for 12 seconds. l
Idle air control motor failed
l motor related circuit .
SCAN TOOL SENSOR READ TESTS (Data list)
12 position (Refer to Check the air control motor. (Refer to
OK
Check the throttle body minimum air flow. (Refer to
Code
No. R e l a y
General scan tool High Speed Radiator Fan Control
[Comment]
Background
lThe high speed radiator fan relay controls the high speed operation of the radiator fan.lOne side of the relay control coil is supplied with 12 volts when the switch is
turned to the ON position.
lThe circuit is completed when the other side of the relay coil is grounded by the PCM.lThe PCM grounds the relay control circuit depending on engine coolant temperature and/or A/C compressor condition, etc.
Range of Check
l Battery voltage: 10
or more
l Ignition switch: ON
Set Condition
lAn open or shorted condition is detected in the hig h speed radiator fan relay control circuitfor 3 seconds.
Probable cause
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l Relay open or l Ignition switch output lLow speed radiator fan relay control circuit
open or shorted
NGMeasure at the PCM connector Check the radiator fan circuit.lDisconnect the connector, and measure at harness side. Voltage between 69 and ground(Ignition switch: ON),.
OK: Battery positive voltage .,
l
Connect a jumper wire between 69 and ground(Ignition switch: ON)
OK: Radiator fan runs at high speed.
OK
Check the following connector: N G Repair
OK
Check trouble symptom.1
NG
Replace the PCM.