Mitsubishi Space Star. Manual — part 20
GDI –
Troubleshooting
13A-7
Code No.
Diagnosis item
P0335
Crank angle sensor system
P0340
Camshaft position sensor system
P0403
EGR valve system
P0420
Catalyst malfunction
P0443
Purge control solenoid valve system
P1200
Injector driver system
P1220
Electronic-controlled throttle valve system
P1221
Throttle valve position feedback system
P1223
Communication line with throttle valve controller
P1224
Throttle valve control servo motor (motor 1st phase malfunction) system
P1225
Accelerator pedal position sensor (2nd channel) system
P1228
Throttle valve control servo motor (motor 2nd phase malfunction) system
P1515
Brake vacuum sensor system
NOTE
1.
If the engine warning lamp illuminates because of a malfunction of the engine-ECU (engine-A/T-ECU),
communication between MUT-
II
and the engine-ECU (engine-A/T-ECU) is impossible. In this case,
the diagnosis code cannot be read.
2.
After the engine-ECU (engine-A/T-ECU) has detected a malfunction, the engine warning lamp illuminates
when the engine is next turned on and the same malfunction is re-detected. However, for items marked
with a “
” in the diagnosis code number column, the engine warning lamp illuminates only on the
first detection of the malfunction.
As for P1220, P1221, P1223, P1224, and P1228, the engine warning lamp flashes. If malfunctions
are detected at the throttle position sensor (1st channel) and the throttle position sensor (2nd channel)
at the same time, or malfunctions are detected at the accelerator pedal position sensor (1st channel)
and the accelerator pedal position sensor (2nd channel) at the same time, the engine warning lamp
will flash.
3.
After the engine warning lamp illuminates, it will be switched off under the following conditions.
(1) When the engine-ECU (engine-A/T-ECU) monitored the power train malfunction three times* and
met set condition requirements, it detected no malfunction.
*:
In this case, “one time” indicates from engine start to stop.
(2) For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature, etc.)
are similar to those when the malfunction was first recorded.
4.
Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.
GDI –
Troubleshooting
13A-8
METHOD OF READING AND ERASING DIAGNOSIS
CODES
Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.
DIAGNOSIS USING DIAGNOSIS 2 MODE
1.
Switch the diagnosis mode of the engine control unit to
DIAGNOSIS 2 mode using the MUT-
II
.
2.
Carry out a road test.
3.
Take a reading of the diagnosis code and repair the problem
location.
4.
Turn the ignition switch to OFF and then back to ON again.
NOTE
By turning the ignition switch to OFF, the engine-ECU
<M/T> or engine-A/T-ECU <A/T> will switch the diagnosis
mode from DIAGNOSIS 2 mode to DIAGNOSIS 1 mode.
5.
Erase the diagnosis codes.
INSPECTION USING MUT-
II
DATA LIST AND
ACTUATOR TESTING
1.
Carry out inspection by means of the data list and the
actuator test function. If there is an abnormality, check
and repair the chassis harnesses and components.
2.
After repairing, re-check using the MUT-
II
and check that
the abnormal input and output have returned to normal
as a result of the repairs.
3.
Erase the diagnosis code memory.
4.
Remove the MUT-
II
, and then start the engine again and
carry out a road test to confirm that the problem has
disappeared.
GDI –
Troubleshooting
13A-9
FREEZE FRAME DATA
When the engine-ECU <M/T> or engine-A/T-ECU <A/T>
detects a malfunction and stores a diagnosis code, it also
stores a current status of the engine. This function is called
“Freeze frame data.” By analyzing this “freeze frame” data
with the MUT-
II
, an effective troubleshooting can be performed.
The display items of freeze frame data are shown below.
Display item list
Data item
Unit
Engine coolant temperature sensor
C
Engine speed
r/min
Vehicle speed
km/h
Long-term fuel compensation (long-term
fuel trim)
%
Short-term fuel compensation (short-term
fuel trim)
%
Fuel control condi-
tion
Open loop
OL
tion
Closed loop
CL
Open loop owing to
drive condition
OL-DRV.
Open loop owing to
system malfunction
OL-SYS.
Closed loop based
on one oxygen sen-
sor
CL-H02S
Calculation load value
%
Diagnosis code during data recording
–
NOTE
If malfunctions have been detected in multiple systems, store
one malfunction only, which has been detected first.
READINESS TEST STATUS
The engine-ECU <M/T> or engine-A/T-ECU <A/T> monitors
the following main diagnosis items, judges if these items are
in good condition or not, and the stores its history. This history
can be read out by using MUT-
II
. (If the ECU has judged
a item before, the MUT-
II
displays “Complete.”)
In addition, if diagnosis codes are erased or the battery cable
is disconnected, this history will also be erased (the memory
will be reset).
Catalyst: P0420
Oxygen sensor: P0130
Oxygen sensor heater: P0135, P0141
GDI –
Troubleshooting
13A-10
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 item
Control contents during malfunction
Air flow sensor
1.
Suspends lean burn operation.
2.
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.
Intake air temperature sensor
Controls as if the intake air temperature is 25
C.
Throttle position sensor (2nd
channel)
1.
Suspends lean burn operation.
2.
Controls the throttle opening angle feedback (half as much as the opening
rate in the normal condition) by using signals from the throttle position sensor
(1st channel). However, this controlling system is not applied if the throttle
position sensor (1st channel) and throttle position sensor (2nd channel)
combination output voltage is outside 4 – 6 V.
3.
Refrains from controlling the throttle opening angle feedback if the throttle
position sensor (1st channel) is also defective.
Engine coolant temperature
sensor
Controls as if the engine coolant temperature is 80
C.
(Moreover, the control system
is working until the ignition switch is turned OFF if the sensor signal returns to normal.)
Camshaft position sensor
Controls maintaining the condition before determined as failure.
Fuel will be cut-off 4 seconds after a malfunction is detected. (However, only if
No. 1 cylinder TDC has never been detected after the ignition switch is turned
to the ON position)
Vehicle speed sensor
1.
Suspends lean burn operation. However, the control is cancelled as a certain
time passes by with the engine speed of 1,500 r/min or more.
2.
Suspends lean burn operation during the engine idling.
Barometric pressure sensor
Controls as if the barometric pressure is 101 kPa.
Detonation sensor
Fixes the ignition timing as that for standard petrol.
Injector
1.
Suspends lean burn operation.
2.
Suspends the exhaust gas recirculation.
Ignition coil (incorporating pow-
er transistor)
1.
Suspends lean burn operation.
2.
Cuts off the fuel supply to cylinders with an abnormal ignition signal.
Fuel pressure sensor
1.
Controls as if the fuel pressure is 5 MPa. (In case of open/short circuit)
2.
Turns the fuel pump relay off. (In case of abnomality in high pressure)
3.
Suspends fuel injection. (when the low pressure is detected and the engine
speed is more than 3,000 r/min)
Alternator FR terminal
Refrains from controlling to suppress the alternator output to electrical load.
(Operated as a normal alternator)
Accelerator pedal position sen-
sor (2nd channel)
1.
Suspends lean burn operation.
2.
Controls the throttle valve position by using signals from the accelerator pedal
position sensor (1st channel). (However, the control system is not applicable
if the difference from the accelerator pedal position sensor (1st channel) output
voltage is 1.0 V or higher.)
3.
Suspends the electronic controlled throttle valve system if accelerator pedal
position sensor (1st channel) is also defective.
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