1990 MITSUBISHI SPYDER check engine

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.

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Power Steering Pressure Sensor CircuitProbable cause
[Comment] Power pressure switch Backgroundl Open or shorted power steering pressurelWhen the steering wheel is kept in the position during driving, the power
s w i t c h or steering pressure switch will be momentarily turned off. E n g i n e c o n t r o l f a i l e d ’lThe enginecontrol module checks whetherthe powerste ering pressure switch momentarilyturns off during driving.
Check Area Engine coolant temperature is or higher.
l Driving and stopping ‘2 are repeated times or more.“1: Engine speed is 2,500 or higher, volumetric efficiency is 55% or higher, and this
condition continues for 2 seconds or more.
l 2: Engine speed is 600 or lower.
Judgement Criterial Power steering pressure switch stays on without cha nging.
NGCheck the power steering press On-vehicle Service) Replace
lDisconnect the connector and measure at the harness side.
NG
between ECM and power pressure switch
NG
the ECM. Replace the ECM.
Code No. Transmission Range Sensor Circuit
Malfunction (RPNDL Input)
[Comment]
Background
lWhen a malfunction of the park/neutral position swi tch is detected, the transaxle control
module outputs amalfunction signal to the engine control module.
Check Area, Judgement Criteria l
control module.
Check the TCM. (Refer to GROUP Troubleshooting.)
Repair
Repair
cause
l Park/neutral position switch failedlOpen or shorted park/neutral position switchcircuit, or loose connector.
l Engine control module failed.
Code No. Turbocharger Waste Gate Actuator
Malfunction
(Turbo)> Probable cause
l
Turbocharger waste gateactuator failed.
l Charging pressure control system failed.
l Engine control module failed.[Comment]
Background
lThe engine control module checks that the engine is not overcharged by always monitoringintake air volume.lThe engine control module protects the engine by shutting off fuel when an overcharged
condition is detected.
Check Area
Engine coolant temperature is higher than
Judgement Criterial Volumetric efficiency has continued to be not lower than 200% for 1.5 sec.
Check the turbocharger supercharging. (Refer to GROUP 15
On-vehicle Service.)
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ENGINE (TURBO)
AND
Code No. Turbocharger Waste Gate Solenoid
Malfunction
Engine (Turbo)>
Probable cause
[Comment]l Turbocharger waste gate solenoid BackgroundlThe engine control module checks current flows in t he turbocharger waste gate solenoidl loose connector.
drive circuit when the solenoid is ON and OFF. l Engine control module failed.
Check Areal Battery voltage is not lower than 10 V.
Judgement CriterialSolenoid coil surge voltage (system voltage V) is not detected when the turbochargerwaste gate solenoid is turned on/off.
Check the turbocharger
NG
(Refer to GROUP 15 On-vehicleService.) Replace
OK
Measure at the turbocharger waste gate pressure sol enoidconnectorlDisconnect the connector and measure at the harnessRepair, if necessary.
.
side.l Voltage between 2 and ground (Ignition switch: ON)
OK: Battery positive voltage
Measureat the ECM connector lDisconnect the connectorand measure at the harness
- 1 N G
Check the following con- Repair A-l 00
lVoltage between 11 and ground (Ignition switch: ON)
OK: Battery positive voltageOK
Check trouble symptom.
NG
,
RepairCheck the harness wire between ECM and Repair, if
Check trouble symptom.
N G
[Replace the ECM. ,
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ENGINE (TURBO)
AND ,
Code No. Fuel Pressure Solenoid Malfunction
Engine
BackgroundlThe engine control module checks current flows in the fuel pressure solenoid drive circuitwhen the solenoid is on and off.
Check Area l Battery voltage is not lower than 10 V.
Judgement
lSolenoid coil surge voltage (system voltage 2 V) is not detected when the fuel pressuresolenoid is turned on/off.
Probablecause
l Fuel pressure solenoid lOpen or shorted fuel pressure or loose connector
l E n g i n e
. .
Check the fuel press Replace
OK
Measure at the fuel pressure solenoid connector lDisconnect the connector and measure at the harness
side.
l Voltaae between 1 and (Ignition switch: ON)
. . . . if I
OK: positive voltage.
OK
Check trouble
NG
Check the wire between and Repair, necessary.
TSB Revision