DIAGNOSIS SYSTEM


Engine-ECU has been provided with the following functions for easier system inspection.

FREEZE-FRAME DATA


When determining the malfunction and storing the diagnosis code, the engine-ECU stores the sensor input status, the control status and so on for each of the diagnosis codes at the time of malfunction detection. This function’s data are called "Freeze Frame" data.
The each diagnosis code has two blocks for storing the freeze frame data. The block 1 and 2 store the same data at the first detection. After the engine-ECU judges the first detected malfunction to have been corrected by change in some circumstances, the malfunction is detected again, whose data the block 2 can store. Whenever this is repeated again, the freeze frame data are updated and stored in the block 2.
By analyzing these freeze frame data with the M.U.T.-III, an effective troubleshooting can be performed.
The display items of freeze frame data are shown below.
Data
 Unit
Intake air temperature sensor
 °C
Engine coolant temperature
 °C
Engine speed (crank angle sensor)
 r/min
Vehicle speed
 km/h
Air flow sensor
 g/s
Ignition advance
 deg
Long-term fuel compensation (long-term fuel trim)
 %
Short-term fuel compensation (short-term fuel trim)
 %
Fuel control condition
 Open loop
Closed loop
Open loop owing to drive condition
Open loop owing to system malfunction
Closed loop based on one oxygen sensor
Calculated lode value
 %
Throttle position sensor (main)
 %
Frequency counter*
 -
Engine warning lamp distance
 -
Diagnosis code during data recording
 -
note *:When the data in the block 2 is updated, that in the block 1 is also updated.

DIAGNOSIS CODE


The diagnosis and engine warning lamp items are given in the table below.
Code No.
 Diagnosis item
 Main diagnosis contents
 Engine warning lamp
P0011
 Mitsubishi innovative valve timing electronic control (MIVEC) system
 Abnormal MIVEC system
 -
P0090
 Fuel pressure control solenoid valve
 Open circuit or short-circuit in solenoid valve-related circuits
 ON
P0100
 Air flow sensor
 Open circuit or short-circuit in sensor-related circuits
 ON
P0110
 Intake air temperature sensor system
 Open circuit or short-circuit in sensor-related circuits
 ON
P0115
 Engine coolant temperature sensor system
 Open circuit or short-circuit in sensor-related circuits
 ON
P0122*
 Throttle position sensor (main) circuit low input
 Open circuit or short-circuit in sensor-related circuits
 ON
P0123*
 Throttle position sensor (main) circuit high input
 Short-circuit in sensor-related circuits
 ON
P0125*
 Feedback system monitor
 Oxygen sensor not operating
 ON
P0130
 Oxygen sensor (front) system
 Open circuit or short-circuit in sensor-related circuits
 ON
P0135
 Oxygen sensor heater (front) system
 Open circuit or short-circuit in heater-related circuits
 ON
P0136
 Oxygen sensor (rear) system
Open circuit or short-circuit in sensor-related circuits
 ON
P0141
 Oxygen sensor heater (rear) system
Open circuit or short-circuit in heater-related circuits
 ON
P0170
 Abnormal fuel system
 Leanness or richness problem
 ON
P0201
 No. 1 injector system
 Open circuit or short-circuit in injector-related circuits
 ON
P0202
 No. 2 injector system
 Open circuit or short-circuit in injector-related circuits
 ON
P0203
 No. 3 injector system
 Open circuit or short-circuit in injector-related circuits
 ON
P0204
 No. 4 injector system
Open circuit or short-circuit in injector-related circuits
 ON
P0222*
 Throttle position sensor (sub) circuit low input
 Open circuit or short-circuit in sensor-related circuits
 ON
P0223*
 Throttle position sensor (sub) circuit high input
 Open circuit in sensor-related circuits
 ON
P0243
 Waste gate solenoid valve system
 Open circuit or short-circuit in solenoid valve-related circuits
 ON
P0300
 Random cylinder misfire detection system
 Abnormal ignition signal (Misfiring)
 ON
P0301
 No. 1 cylinder misfire detection system
 Misfiring
 ON
P0302
 No. 2 cylinder misfire detection system
P0303
 No. 3 cylinder misfire detection system
P0304
 No. 4 cylinder misfire detection system
P0325
 Detonation sensor system
 Abnormal sensor output
 ON
P0335
 Crank angle sensor system
 Abnormal sensor output
 ON
P0340
 Camshaft position sensor system
 Abnormal sensor output
 ON
P0420
 Catalyst malfunction
 Abnormal exhaust gas purification performance of catalyst
 ON
P0443
 Purge control solenoid valve system
 Open circuit or short-circuit in solenoid valve-related circuits
 ON
P0500*
 Vehicle speed signal system
 Open circuit or short-circuit in sensor-related circuits
 ON
P0513*
 Immobilizer malfunction
 Open circuit or short-circuit in sensor-related circuits
 -
P0603*
 EEPROM malfunction
 Abnormality in engine-ECU
 ON
P0606*
 Engine-ECU main processor malfunction
 Abnormality in engine-ECU
 -
P0622
 Alternator FR terminal system
 Open circuit in sensor-related circuits
 -
P0638*
 Throttle valve control servo circuit range/performance problem
 Abnormal throttle valve control servo
 ON
P0657*
 Throttle valve control servo relay circuit malfunction
 Open circuit or short-circuit in sensor-related circuits
 ON
P1021
 Oil control valve circuit
 Open circuit or short-circuit in sensor-related circuits
 ON
P1231*
 Trustful check ASC <Vehicle with ASC>
 Abnormality in ABS/ASC-ECU
 -
P1232*
 Fail-safe control system
 Abnormality in engine-ECU
 -
P1603*
 Battery back-up line system
 Open circuit in system-related circuits
 ON
P1630*
 Variant coding errors
 After engine-ECU replacement, the vehicle information is not stored, or the wrong one is stored.
 ON
P1964*
 AD converter
 Abnormality in engine-ECU
 ON
P1965*
 Trustful check accelerator pedal position sensor
 Abnormality in accelerator pedal position sensor
 ON
P1967*
 Trustful check engine speed
 Abnormality in engine-ECU
 ON
P1969*
 Trustful check ignition timing <Vehicle with ASC>
 ABS/ASC-ECU
 -
P1970*
 Torque monitoring
 Abnormality in engine-ECU
 ON
P1971*
 Fail-safe control monitoring
 Abnormality in engine-ECU
 -
P1972*
 Inquiry/response error
 Abnormality in engine-ECU
 -
P1973*
 RAM test for all area
 Abnormality in engine-ECU
 -
P1974*
 Cyclic RAM test (engine)
 Abnormality in engine-ECU
 -
P1977*
 Communication error
 Abnormality in engine-ECU
 -
P1978*
 Throttle valve control servo malfunction
 Abnormality in throttle valve control servo
 ON
P2100*
 Throttle valve control servo circuit (open)
 Open circuit in throttle valve control servo-related circuit
 ON
P2122*
 Accelerator pedal position sensor (main) circuit low input
 Open circuit or short-circuit in sensor-related circuits
 ON
P2123*
 Accelerator pedal position sensor (main) circuit high input
 Open circuit in sensor-related circuits
 ON
P2127*
 Accelerator pedal position sensor (sub) circuit low input
 Open circuit or short-circuit in sensor-related circuits
 ON
P2128*
 Accelerator pedal position sensor (sub) circuit high input
 Open circuit in sensor-related circuits
 ON
P2135*
 Throttle position sensor (main and sub) range/performance problem
 Abnormal sensor output
 ON
P2138*
 Accelerator pedal position sensor (main and sub) range/performance problem
 Abnormal sensor output
 ON
U1073*
 Bus off
 Abnormality in CAN bus line
 -
U1102*
 ABS-ECU <Vehicle without ASC> or ABS/ASC-ECU <Vehicle with ASC> time-out
 Abnormality in CAN bus line
 -
U1106*
 Electric power steering-ECU time-out
 Abnormality in CAN bus line
 -
U1108*
 Combination meter time-out
 Abnormality in CAN bus line
 ON
U1109*
 ETACS time-out
 Abnormality in CAN bus line
 -
U1110*
 A/C-ECU time-out
 Abnormality in CAN bus line
 -
U1112*
 SRS time-out
 Abnormality in CAN bus line
 -
-
 Engine-ECU
 Abnormality in engine-ECU
 ON
note When the first time a malfunction is detected, the engine-ECU does not store a fault code. However, if the same malfunction is again detected the next time the engine is operated, a fault code is stored. For systems or components marked with "*" to be diagnosed, when the first time a malfunction is detected, a fault code is stored and the engine warning lamp is illuminated.

DATA LIST FUNCTION


The data list items are given in the table below
Item No.
 Inspection item
 Unit
1
 Alternator G terminal duty
 %
2
 Power supply voltage
 V
3
 Crank angle sensor
 r/min
4
 Target idle speed
 r/min
5
 Vehicle speed
 km/h
6
 Intake air temperature sensor
 °C
8
 Engine coolant temperature sensor
 °C
9
 Oxygen sensor (front)
 mV
10
 Oxygen sensor (rear)
 mV
11
 Accelerator pedal position sensor (main)
 mV
12
 Accelerator pedal position sensor (sub)
 mV
13
 Throttle position sensor (main)
 mV
14
 Throttle position sensor (sub)
 mV
15
 Ignition advance
 deg
16
 Injectors
 ms
17
 Idle speed control position learned value
 Step
18
 Idle speed control position learned value (A/C load)
 Step
19
 Air-fuel ratio feedback integration
 %
20
 Air-fuel ratio learning value of A zone (Low load)
 %
21
 Air-fuel ratio learning value of B zone (Low speed load)
 %
22
 Knock retard
 CA
23
 Learned knock retard
 %
24
 Accelerator pedal position sensor (main) learned value (Closed position)
 mV
25
 Oil control valve target current value
 mA
26
 Electric power steering current value (CAN)
 A
27
 Cranking signal (Ignition switch-ST)
 ON/OFF
28
 Purge control solenoid valve duty
 %
29
 MIVEC phase angle
 CA
30
 MIVEC phase angle target value
 CA
67
 Idle position signal
 ON/OFF
73
 Starter relay
 ON/OFF
78
 Brake lamp switch (CAN)
 ON/OFF
79
 Barometric pressure sensor
 kPa
80
 Air flow sensor
 g/s
130
 Fuel control condition
 Closed loop/Open loop-drive condition
131
 Volumetric efficiency
 %
-
 Mass air flow rate (GST only)
 gm/s
-
 Throttle position sensor (main) (GST only)
 %
-
 Engine warning lamp distance (GST only)
 km

ACTUATOR TEST FUNCTION


The actuator test items are given in the table below
Item No.
 Inspection item
 Drive content
01
 Injector
 Cut off No. 1 injector
02
 Cut off No. 2 injector
03
 Cut off No. 3 injector
04
Cut off No. 4 injector
05
 Fuel pump
 Drive fuel pump to circulate fuel
06
 Purge control solenoid valve
 Switch solenoid valve from OFF to ON
07
 Basic ignition timing
 Switch engine-ECU to ignition timing adjusting mode
08
 Radiator fan (Hi)
 Drive the fan motor at high speed
09
 Radiator fan (Low)
 Drive the fan motor at low speed
10
 Throttle valve control servo
 Stop the throttle valve control servo
11
 Fuel pressure control solenoid valve
 Switch solenoid valve from OFF to ON
12
 Waste gate solenoid valve
 Switch solenoid valve from OFF to ON