MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE
AND ENGINE> Troubleshooting. ,
Code No. Catalyst System Efficiency Below Threshold
(Bank 1) .
,[Comment]Backgroundl Catalytic converter deteriorated
lThe signal from the heated oxygen sensor which foll ows the catalytic’ converter differsl
Heated oxygen sensor failed from that which precedes the converter. That is because the catalytic converter l
Engine control purifies exhaust gas. When the catalytic converter has deteriorated, the signal from theheated oxygen sensor which follows the catalytic co nverter becomes similar to that whichprecedes the catalytic converter.
l The engine control module checks the output of the heated oxygen sensor signals.
Check Area
lEngine speed is not less than 2600 Engine or 2500 lVolume air flow sensor output frequency is between 36 and 262 Hz or 50 and
300 Hz Engine (Turbo)>
l Volume air flow sensor output frequency is between 50 and 240 Hz.
l Intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
l Closed throffle position switch: OFF
l Under the closed loop air-fuel ratio control.
l Monitoring Time: 140
Judgement Criterial Oxygen sensor (rear) signal and oxygen sensor (fron t) signal are abnormal.
NG Replace
OK
SCAN TOOL Data list Check the oxygen sensor malfunction (bank 1 sensor 2) INSPECTION PROCEDURE FOR DIAGNOS-59 Heated oxvaen senosr (rear) (Refer to TIC TROUBLE CODE l gear range l Drive with wide open throttleI
.
TOOL Data listRefer to raced
. 1000 1 1. - - - -
OK: 600
N G Check the oxygen sensor circuit (bank 1 sensor INSPECTION TIC TROUBLE CODE
SCAN TOOL Data list 11 Heated oxygen sensor (front) (Refer to
l Engine: 2000
.NG Replace the heated oxygen sensor (front).
OK: Switches between 0 400 600 1,000 15 or
more times in 10 seconds
Replace the heated oxygen sensor (rear)
I
Check the trouble
NG
Replace the converter.
Check trouble
Replace the ECM.
NG
Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Evaporative Emission Control System
Malfunction
Engine (Turbo)>
Probable cause
[Comment]l purge . . .
BackgroundlOpen or shorted evaporative lThe evaporative emission purge solenoid opens and while the engine is idling. l o o s e Then the fuel compensation value changes according to whether the evaporative emissioncanister emits purge air or not. l connection l l
The engine control module checks for this change.
l .
Check Area l
Engine control module
l 3 min or more have passed after the sequence was completed. ,
l Engine coolant temperature is higher than l Power steering switch: OFFl Under the closed loop air-fuel ratio control.l Under the close loop idle speed control
.l Monitoring 3
Judgement CriterialThere is a small amount of variation (3% or less) inthe short-term fuel compensation
value (average value) when the EVAP purge solenoid is turned on.
Check the evaporative emission purge system (Refer to GROUP17 Emission Control System)
Check the purge port vacuum.
Check the vapor hose between the fuel tank and the evaporative
TSB Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Evaporative Emission System
Detected Malfunction Engine>Probable cause
[Comment]lImproper tightening of fuel tank filler tube cap
Backgroundl Fuel vent valve failedlThe engine control module turns the evaporative emi ssion ventilation solenoid on in order Purge line or to shut off the outside air of the evaporative emission canister.lBroken seal in fuel purge line or vaporNext, the evaporative emission purge solenoid is driven at the specified duty (approximately
line25%) to generate a negative pressure in the fuel ta nk and purge line, etc.
l Evaporative emission, purge solenoid failedWhen a negative pressure is generated in the fuel t ank and purge line, etc., the evaporativeemission purge solenoid turns off and the fuel tank and purge line, etc. are sealed.l
Evaporative solenoidfailed,
After they are sealed, monitoring of pressure diffe rences inside the fuel tank starts, andlFuel tank differential failed
if there is a large drop in pressure over a given t ime (if the negative pressure is leakinglEngine coolant temperature sesnor failedout into the atmosphere and the pressure has approa ched barometric pressure), the enginel Intake air temperature sensor failed
control module judges that there is a leak in the f uel tank, purge line or vapor line.
l Power steering pressure switch failed
Furthermore, if the fuel tank internal pressure doe s not drop even if the evaporative emission Incorrect fuel used
purge solenoid is driven while the outside air of the canister is shut off (becauseof a blockage in the purge line or because the fuel tank filler tube cap has not been
tightened correctly), the engine control module jud ges that there is a problem with the
system and the check engine/malfunction indicator l amp illuminates.
Check Area
l Engine coolant is not lower than Engine speed is at between 1600 3500 l Power steering pressure switch: OFF Ambient pressure is not lower than 76 (11.0 psi). Volumetric efficiency: 20 Intake air temperature is not lower than Pressure increase when evaporative emission purge s olenoid and evaporative emission
ventilation solenoid are closed is 50 or less. Pressure variation range is 66 or less. Monitoring time: 50 100 sec.
CriteriaInternal pressure of the fuel tank has not changed more than 100 in 20 after
the tank and vapor line were closed. .
Check if the fuel tank filler tube cap is attached correctly.
OK
NG
N G
Attach correctly.
Repair or replace
OK
SCAN TOOL Actuator test
06 Evaporative emission purge solenoid (Refer to
OK
Check the evaporative emission control system purge control valvecircuit malfunction (Refer to INSPECTION DURE FOR DIAGNOSTIC TROUBLE CODE
NGSCAN TOOL Actuator test29 Evaporative emission ventilation solenoid (Refer to
OK
Check the evaporative emission control system vent control function (Refer to INSPECTION PROCEDURE FOR
DIAGNOSTIC TROUBLE CODE
SCAN TOOL Data listN G
73 Fuel tank differential pressure sensor (Refer to Check the evaporative emission control system pres sure sensor
DIAGNOSTIC TROUBLE CODE
SCAN TOOL Data list
21 Engine coolant temperature sensor (Refer to Check the engine coolant temperature sensor circuit malfunction
OKTIC TROUBLE CODE
SCAN TOOL listN G
13 Intake air temperature sensor (Refer to
OK
Check the intake air temperature sensor circuit mal function (Referto INSPECTION PROCEDURE DIAGNOSTIC
TROUBLE CODE
27 Power steering pressure switch (Refer to
OK
Check the power steering pressure sensor circuit r ange/perfor-
mance (Refer to INSPECTION PROCEDURE FORDIAGNOSTIC TROUBLE CODE
l Check for contamination (water, kerosene, etc.) in the fuel.
have failed. [Refer to the Emission Diagnosis Manua l (Pub.
Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Evaporative Emission Control System PurgeProbable
Control Valve Circuit Malfunction
[Comment]
Background
lThe engine control module checks whether current flows in the evaporative emission purgesolenoid drive circuit when the solenoid is driven.
Check Area
Battery voltage is not lower than 10
JudgementlSolenoid coil surge voltage (system voltage 2 V) is not detected when the EVAP purge
solenoid is turned on/off. l
Evaporative emission purge
lOpen or shorted solenoid or Engine control module failed
.
Measure at the ECM
Check the evaporative
l
NG
Disconnect the connector and measure at the harness
side.
l
to GROUP
Voltage between 9 and ground (Ignition switch: ON) Control System.)
OK:
oositive
OK
NG
Measure at the evaporative emission purge
lDisconnect the connector and measure at the harness
side.
l Voltage between 2 and ground (Ignition switch: ON)
OK: Battery positive voltage
Replace
and repair if
. . Check the following con-? R e p a i r
OK
Check trouble symptom.
NG
Check the harness wire between ECM and solenoid val ve Repair, if necessary.
Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Evaporative Emission Control System Vent Probable cause
Control Malfunction
Engine>
[Comment]l Evaporative emission vent Backgroundl Open or shortedevaporativelThe engine control module checks current flows in t he evaporative emission ventilation
solenoid circuit, or loose connector.
solenoid drive circuit when the solenoid is ON and OFF
l Engine control module failed.
Check Area voltage is not lower than V.
Judgement CriterialSolenoid coil surge voltage (system voltage is not detected when the Evaporative
emission vent solenoid is turned on/off.
Check the evaporative emission ventilation solenoid (Refer to
GROUP 17
Emission Control System)
Check the harness wire between relay and
Measure at the ECM connector lDisconnect the connector and measure at the harness side.
l Voltage between 55 and ground
(Ignition switch: ON)
OK: Batten/ positive
OK
c o n n e c t o r . R e p a i r , i f n e c e s s a r y .
NG Check NG
O K
Check trouble symptom.
NG
Check the harness wire between ECM and connec-tor. Repair, if necessary.
Check trouble symptom. Replace the ECM.
TSB Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Evaporative Emission
Pressure Sensor Malfunction Engine>
[Comment]Background
lThe fuel tank differential pressure sensor outputs the voltage in proportion to the pressurein the fuel tank. (differential pressure against the barometric pressure)
l The engine control module checks whether the output voltage of the fuel tank differential
pressure sensor is within the specified range
Check Area, Judgement Criteria 1. Check Area
l Engine speed is not lower than 1500
l Volumetric efficiency is between 25
Judgement Criterial
The sensor output voltage is 4.5 or higher for 10 seconds even though the intake
air temperature is between 5” and the evaporative emission
purge solenoid is being driven at 100% duty.
or
l The sensor output voltage is 0.5
or lower for 10 seconds even though the intake
air temperature is (41 or higher and the evaporative emission purge solen oid
is not being driven.
2. Check Area l The pressure fluctuates 20 times or more at 0.2
or higher.
l Closed position switch: ON
Judgement Criterial
The pressure fluctuates 20 times or more (0.2 or higher) for 15 consecutive idleoperations.
Fuel tank differential pressure Openor shorted fuel o r Engine control module ,
.
Disconnect the connector and measure at the harness side.
2. Continuity between 2 and ground OK: Continuity
OK
NGCheck the following Repair
NGNGCheck the harness Repair
between fuel tank differ-
ential
sensor and
Replace the fuel tank differential pressure sensor.
NGNGCheck the harness wire
between fuel tank differ-
/ Check
Check the harness wire between fuel tank differenti al pressure
sensor and ground. Repair, if necessary.
T S B R e v i s i o n

E N G I N E ( T U R B O )
AND ENGINE> Troubleshooting . .
Code No. Vehicle Speed Sensor Malfunction
[Comment]
Background
lThe vehicle speed sensor outputs a pulse signal while the vehicle is driven.
l The engine module checks whether the pulse signal is output.
Check Area
l Engine speed is not lower than 3000
l Volumetric efficiency is 70% or higher.
Judgement CriterialSensor output voltage has not changed (no pulse sig nal is input) for 4 sec.
speed sensor lOpen or shorted vehicle-speed or loose lEngine module
,
Check the vehicle speedtion Meters) Repair
OK
Measure at the vehicle speed sensor connector lDisconnect the connector and measure at the harness side.1. Voltage between 3 and ground
2 . N G(Ignition switch: ON)
OK: 4.6 5.2 2. Continuity between 2 and ground
OK: Continuity
OKN G Repair
Check trouble symptom.
Replace the ECM.Check harness vehicle speed Repair, if, necessary.
,
Revision

ENGINE (TURBO)
AND. ENGINE> Troubleshooting
Code No. Idle Control System Malfunction ,
[Comment]l Idle air control motor failedBackgroundlOpen or shorted idle-air control l If there is a malfunction of the system, the actual engine speed will not be identi calto the target engine speed.
l , Engine control l The engine control module checks the difference bet ween the actual engine speed andthe target engine speed.
Check Area, Judgement Criteria
1. Check Areal Under the closed loop idle speed control. , . .Judgement CriteriaActual idle speed has continued to be higher than t
he target idle speed by 300 or more for 10 sec.
2. Check Area
l During idle speed closed loop control.
l The maximum outside air temperature during the last operation was
or more. . .
l Engine coolant temperature is approximately or higher.l System voltage is 10 or higher.l Intake air temperature is or higherl Barometric pressure is 76 (11 psi.) or higher.
Judgement Criteria,
l Actual idle speed is higher than the target idle sp eed by 200 or more for 10seconds.
3 . Check Areal During idle closed loop control.l Power switch is off. Volumetric efficiency is 40% or less.
l Intake air temperature is or higherl is 76 (11 psi.) or higher.
Judgement Criteria
Disconnect the connector and measure at the harness
l Voltage between 2 and ground, and 5 and ground
Check the Repair
lDisconnect the connector, measure at the harness si de.l Voltage between each of 4, 5, 17, 16 and ground
(Ignition switch: ON)
OK: Battery positive voltage
.
Repair
.
.
Check trouble symptom.
NG
Check harness wire between ECM and idle air control motor connectorRepair, if necessary.
Revision

ENGINE
AND ENGINE> Troubleshooting
Engine>, ,
N GCantheoperation sound be heard Check the idle air control motorsystem. (Refer to after the ignition switch is turned INSPECTION PROCEDURE 35.)to the ON position? C h e c k t h e OKNG
Check trouble symptom.
Measure at the idle air control mo-tor connector l Use the test harness to connector theconnector.l Voltage between 2 andground after the ignitionswitch is turned to the ONposition.)
OK: changes from 1.5 4.0 (momentary) to 0 1 or 4.5 5.5 l Voltage between 4 andground (right ignitionswitch is turned to the ONposition.)
OK: changes from 1.5 4.0 (momentary) to 0 1 or 4.5 5.5
OK
Replace the ECM.
Measure at the idle air control mo-tor connector lDisconnect the connector, andmeasure at the harness side.
l Voltage between 1, 2, 4 and
ground (Ignition switch: ON)
OK: 4.8
5.2 Continuity between 3 andgroundOK: Continuity
OKNG Replace the ECM.I
Checkthefollowingconnectors: Repair
t r o u b l e ,
Replace the idle air control motor.
Revision

ENGINE (TURBO)
AND ENGINE> T r o u b l e s h o o t i n g
Code No. Closed Throttle Position Switch MalfunctionProbable cause
[Comment]l Closed throttle position switch failed. BackgroundlOpen or shorted lWhile the engine is idling without pressing the acc elerator pedal, “ON” signal can be inputcircuit, or loose connector. from the closed throttle position switch top the engine control module. Engine control module failed.lThe engine control module is used for checking the input signal during the engine idling.
Check Area, Judgement Criteria 1. Check Area
l Throttle position sensor output voltage is 2.0 or higher.
Judgement Criteria ,
l Closed throttle position switch is on. .
2. Check Area
I
l
Driving ‘1 and stopping ‘2 are repeated 15 times or more.
‘1 driving: Engine speed is 1,500 or higher, air flow sensor output frequency
is 100 Hz or higher, and this condition continues f or 2 seconds or more.
l Engine speed is not higher than 800
Judgement Criterial Closed position switch has continued to be OFF.
Check the closed throttle position switch.
(Refer to NG Replace the throttle position sensor
OK
Measure at the throttle position sensor connector lDisconnect the connector, and measure at the harnes sside.l Voltaae between 3 and around switch: ON)
OK: or higher l between 4 and
. Check trouble symptom.
OK:
Check the Repair
N G
[Check the harness wire between ECM andthrottle position connector.
OKNG
OK Replace the ECM.Repair
TSB Revision
NG
Replace the ECM.