DIAGNOSIS FUNCTION



ENGINE WARNING LAMP (CHECK ENGINE LAMP)



When the abnormal condition occurs with respect to the items of Multipoint Fuel Injection (MPI) system shown in the table, the engine warning lamp will illuminate or flash. When the lamp remains illuminated after the engine start, or when the lamp is illuminated while the engine is running, check the diagnosis code output. When the ignition switch is in ON position, the indicator lamp is illuminated once, and then extinguished when the engine starts.
note When the CVT-ECU detects malfunctions related to the CVT, the engine warning lamp is also illuminated.

ENGINE WARNING LAMP INSPECTION ITEMS


caution The engine warning lamp continuously illuminates when the engine-ECU malfunctions.
P0010
Oil feeder control valve system
P0031
Oxygen sensor (front) heater circuit low input
P0032
Oxygen sensor (front) heater circuit high input
P0037
Oxygen sensor (rear) heater circuit low input
P0038
Oxygen sensor (rear) heater circuit high input
P0068*1
Trustful check air flow sensor
P0102*1
Air flow sensor circuit low input
P0103*1
Air flow sensor circuit high input
P0107
Manifold absolute pressure sensor circuit low input
P0108
Manifold absolute pressure sensor circuit high input
P0112*1
Intake air temperature sensor circuit low input
P0113*1
Intake air temperature sensor circuit high input
P0117*1
Engine coolant temperature sensor circuit low input
P0118*1
Engine coolant temperature sensor circuit high input
P0121*1
Trustful check throttle position sensor (main)
P0122*1
Throttle position sensor (main) circuit low input
P0123*1
Throttle position sensor (main) circuit high input
P0131
Oxygen sensor (front) circuit low voltage
P0132
Oxygen sensor (front) circuit high voltage
P0133
Oxygen sensor (front) circuit slow response
P0134
Oxygen sensor (front) circuit no activity detected
P0137
Oxygen sensor (rear) circuit low voltage
P0138
Oxygen sensor (rear) circuit high voltage
P0140
Oxygen sensor (rear) circuit no activity detected
P0171
Abnormal fuel system (lean)
P0172
Abnormal fuel system (rich)
P0221*1
Trustful check throttle position sensor (sub)
P0222*1
Throttle position sensor (sub) circuit low input
P0223*1
Throttle position sensor (sub) circuit high input
P0261
No. 1 injector circuit low input
P0262
No. 1 injector circuit high input
P0264
No. 2 injector circuit low input
P0265
No. 2 injector circuit high input
P0267
No. 3 injector circuit low input
P0268
No. 3 injector circuit high input
P0270
No. 4 injector circuit low input
P0271
No. 4 injector circuit high input
P0300*2
Random/multiple cylinder misfire detected
P0301*2
No. 1 cylinder misfire detected
P0302*2
No. 2 cylinder misfire detected
P0303*2
No. 3 cylinder misfire detected
P0304*2
No. 4 cylinder misfire detected
P0335*1
Crank angle sensor system
P0340*1
Camshaft position sensor system
P0421
Catalyst malfunction
P0458
Purge control solenoid valve circuit low input
P0459
Purge control solenoid valve circuit high input
P0500*1
Vehicle speed signal system <M/T>
P0557
Brake booster pressure sensor circuit low input
P0558
Brake booster pressure sensor circuit high input
P0602*1
Variant coding system
P0606*1
Engine-ECU main processor malfunction
P060B*1
A/D converter
P060D*1
Trustful check accelerator pedal position sensor
P061A*1
Torque monitoring
P061C*1
Trustful check engine speed
P062F*1
EEPROM malfunction
P0630*1
Chassis number not programmed
P0638*1
Throttle valve control servo circuit range/performance problem
P0642*1
Throttle position sensor power supply
P0657*1
Throttle valve control servo relay circuit malfunction
P1040*1
Minimum valve lift not learned yet
P1041*1
Valve lift control motor abnormal voltage drop of driving power supply
P1238*1
Air flow sensor trustful for torque monitoring
P1590*1
CVT-ECU to engine-ECU communication error in torque reduction request <CVT>
P1603*1
Battery backup circuit malfunction
P2100*1
Throttle valve control servo circuit (open)
P2101*1
Throttle valve control servo magneto malfunction
P2122*1
Accelerator pedal position sensor (main) circuit low input
P2123*1
Accelerator pedal position sensor (main) circuit high input
P2127*1
Accelerator pedal position sensor (sub) circuit low input
P2128*1
Accelerator pedal position sensor (sub) circuit high input
P2135*1
Throttle position sensor (main and sub) range/performance problem
P2138*1
Accelerator pedal position sensor (main and sub) range/performance problem
P2228*1
Barometric pressure sensor circuit low input
P2229*1
Barometric pressure sensor circuit high input
P2252
Oxygen sensor offset circuit low voltage
P2253
Oxygen sensor offset circuit high voltage
P2646*1
Valve lift control motor control performance
P2648*1
Valve lift control motor coil open
P2649*1
Valve lift control motor over current
P264B
Valve lift sensor poor sensitivity
P264C*1
Valve lift sensor circuit low input
P264D*1
Valve lift sensor circuit high input
P265B*1
Abnormal hall sensor implanted into valve lift control motor
U0101*1
CVT-ECU time-out <CVT>
U011B*1
Valve lift ECU time-out
U0121*1<M/T>
ASC-ECU Time-out
U0141*1
ETACS-ECU time-out
note After the engine-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 "*1" in the diagnosis code number column, the engine warning lamp illuminates only on the first detection of the malfunction.
note The codes marked with a "*2" in the diagnosis code number column have the following two conditions for illuminating the engine warning lamp.

  • In case that the misfire causing the damaged catalyst is detected, the engine warning lamp will flash until the condition is corrected. If the system detects the same malfunction after the next engine start, and then the condition is corrected, the engine warning lamp will illuminate.
  • In case that the misfire deteriorating the exhaust gas is detected, the engine warning lamp is illuminated when the same malfunction is redetected after the next engine start.
note Even if the malfunction is not detected when the engine-ECU monitors the malfunction three consecutive times* after the engine warning lamp illuminates, turn off the engine warning lamp when the engine starts next time.
*: In this case, "one time" in monitoring the malfunction means the period from the time of the current engine start to the time of the next engine start. "One time" in monitoring the misfire or the fuel system malfunction means the time when the operating conditions (such as the engine speed or the engine coolant temperature) becomes similar operating conditions of the first detected malfunction.

METHOD OF READING AND ERASING DIAGNOSIS CODES


Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Diagnosis Function .

INSPECTION WITH M.U.T.-III SERVICE DATA AND ACTUATOR TEST


Reading service data or performing an actuator test using M.U.T.-III enables you to check the vehicle body harnesses and components for abnormalities. Sensor input or output to the actuator can be displayed in numerical values or graphs in the service data while in the actuator test the actuator can be forced to drive (ON/OFF driving in the specified time).
DIAGNOSIS PROCEDURE
  1. Connect M.U.T.-III to perform inspection with the service data and actuator test function.
  2. If any abnormality is found, inspect and repair vehicle body harnesses and components.
  3. After repair, check that input and output have returned to normal.
  4. If a failure code which is caused by inspection and repair work is generated, erase the failure code.
  5. Disconnect M.U.T.-III and perform a test run to check that the malfunction phenomenon is resolved.

PROVISIONAL DIAGNOSIS CODE CONFIRMED


If detecting the malfunction during the first drive cycle, the engine-ECU temporarily stores the diagnosis code as the provisional diagnosis code. If detecting the same malfunction during the next drive cycle, the engine-ECU determines that the malfunction exists. The engine-ECU outputs the diagnosis code. On the M.U.T.-III, it is possible to display the stored provisional diagnosis code which the engine-ECU had detected during the first drive cycle. This makes it possible to confirm in one drive cycle whether the malfunction could happen again after the repair.
CONFIRMATION METHOD
  1. After the ignition switch is in "LOCK" (OFF) position, connect the M.U.T.-III to the diagnosis connector.
  2. Turn the ignition switch to the "ON" position.
  3. Select "MPI/GDI/DIESEL" from System select Screen of the M.U.T.-III.
  4. Select "Special Function" from MPI/GDI/DIESEL Screen.
  5. Select "Provisional DTCs" from Special Function Screen.

FREEZE FRAME DATA


When the engine-ECU 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 M.U.T.-III, an effective troubleshooting can be performed.
The display items of freeze frame data are shown below.

FREEZE FRAME DATA



DISPLAY ITEM LIST
Item No.
Date Item
Unit·Condition
1
Odometer
km
2
Ignition cycle (Warm up cycle)
-
4
Accumulated minute*1
min
AA*2
Air flow sensor
g/s
AB*2
Throttle position sensor (main)
%
BB*2
Barometric pressure sensor
kPa
BC*2
Relative throttle position sensor
%
BD*2
Throttle position sensor (sub)
%
BE*2
Accelerator pedal position sensor (main)
%
BF*2
Accelerator pedal position sensor (sub)
%
C0*2
Fuel system status 1

  • CL (closed loop)*3
  • OL (open loop)*4
  • OL: DRV (condition of open loop due to acceleration and deceleration driving)
  • OL: SYS (condition of open loop due to system failure)
  • CL: HO2S (condition of closed loop only using front oxygen sensor when rear oxygen sensor is failed)

C1*2*5
Fuel system status 2
N/A
C2*2
Calculated load valve
%
C3*2
Engine coolant temperature sensor
°C
C4*2
Short term fuel trim 1
%
C5*2*5
Short term fuel trim 3
****
C6*2
Long term fuel trim 1
%
C7*2*5
Long term fuel trim 3
****
CC*2
Manifold absolute pressure sensor
kPa
CD*2
Crank angle sensor
r/min
CE*2
Vehicle speed
km/h
CF*2
Advance ignition
°CA
D0*2
Intake air temperature sensor 1
°C
D1*2
Time since engine running*6
sec
D6*2
Purge solenoid duty
%
D8*2
Power supply voltage
V
D9*2
Absolute load value
%
DA*2
Target equivalence ratio
-
DB*2
Intake air temperature sensor 1
°C
DC*2
Commanded throttle actuator control
%
DD*2
Relative accelerator pedal position sensor
%
note *1: Accumulated time of current malfunction from time point when malfunction is detected.
note *2: The items can be seen by selecting "Freeze Frame Data (OBD)" on Self-diagnosis Screen of M.U.T.-III. If detecting multiple malfunctions, the engine-ECU stores the data for only the first item that was detected. If detecting the misfire or fuel system malfunction, the engine-ECU stores the data by giving priority to the misfire or fuel system malfunction in spite of the chronological order of the detected malfunction.
note The Freeze Frame Data (OBD) should not be stored for the diagnosis code when the engine warning lamp does not illuminate.
note *3: Condition in which oxygen sensor signals are fed back to the engine-ECU for controlling fuel.
note *4: Condition in which fuel is controlled without oxygen sensor signals being fed back to the engine-ECU because the condition to shift to the closed loop is not met.
note *5: Data items are displayed on M.U.T.-III display, but the in-line 4 engine is not applicable and its data is displayed as "N/A" or "****".
note *6: Time between engine start and malfunction detection.

FAIL-SAFE AND BACKUP FUNCTION


The control is carried out, which keeps the safety driving by the preset control logic when the diagnosis code is stored. The diagnosis code having the fail-safe function is as follows.

List of fail-safe and backup function items
Code No.
Diagnosis item
Control content during malfunction
P0010
Oil feeder control valve system
V.V.T. phase angle becomes most advanced angle.
P0068
Trustful check air flow sensor
Fuel control is carried out using throttle opening degree and engine speed in accordance with preset map.
P0102
Air flow sensor circuit low input
Fuel control is carried out using throttle opening degree and engine speed in accordance with preset map.
P0103
Air flow sensor circuit high input
Fuel control is carried out using throttle opening degree and engine speed in accordance with preset map.
P0107
Manifold absolute pressure sensor circuit low input
Control as if the inlet manifold vacuum pressure is 101 kPa.
P0108
Manifold absolute pressure sensor circuit high input
Control as if the inlet manifold vacuum pressure is 101 kPa.
P0112
Intake air temperature sensor circuit low input
Control as if the intake air temperature is 25°C.
P0113
Intake air temperature sensor circuit high input
Control as if the intake air temperature is 25°C.
P0117
Engine coolant temperature sensor circuit low input
Control as if the engine coolant temperature is 80°C.
P0118
Engine coolant temperature sensor circuit high input
Control as if the engine coolant temperature is 80°C.
P0121
Trustful check throttle position sensor (main)

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (sub) fails.

P0122
Throttle position sensor (main) circuit low input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (sub) fails.

P0123
Throttle position sensor (main) circuit high input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (sub) fails.

P0221
Trustful check throttle position sensor (sub)

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (main) fails.

P0222
Throttle position sensor (sub) circuit low input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (main) fails.

P0223
Throttle position sensor (sub) circuit high input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (main) fails.

P0300
Random/multiple cylinder misfire detected
The supply of fuel to the misfiring cylinder can possibly be cut.
P0301
No. 1 cylinder misfire detected
The supply of fuel to the misfiring cylinder can possibly be cut.
P0302
No. 2 cylinder misfire detected
The supply of fuel to the misfiring cylinder can possibly be cut.
P0303
No. 3 cylinder misfire detected
The supply of fuel to the misfiring cylinder can possibly be cut.
P0304
No. 4 cylinder misfire detected
The supply of fuel to the misfiring cylinder can possibly be cut.
P0327
Detonation sensor circuit low input
Fix the ignition timing with an allowance against detonation.
P0328
Detonation sensor circuit high input
Fix the ignition timing with an allowance against detonation.
P0340
Camshaft position sensor system

  • Engine runs in learned pattern until engine stops.
  • Does not control variable valve timing (V.V.T.).

P0513
Immobilizer system
Engine start is prohibited.
P0515
Battery temperature sensor system
Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P0557
Brake booster pressure sensor circuit low input
Sets the variable valve lift control mode to negative pressure request mode (to set the valve lift higher than normal).
P0558
Brake booster pressure sensor circuit high input
Sets the variable valve lift control mode to negative pressure request mode (to set the valve lift higher than normal).
P0604
RAM error

  • Microcomputer is reset.
or

  • Throttle opening degree position is in default position.
P0606
Engine-ECU main processor malfunction
Throttle opening degree position is in default position.
P060B
A/D converter
Throttle opening degree position is in default position.
P060D
Trustful check accelerator pedal position sensor
Throttle opening degree position is in default position.
P061A
Torque monitoring
Throttle opening degree position is in default position.
P061C
Trustful check engine speed
Throttle opening degree position is in default position.
P061F
Fail-safe control system
Microcomputer is reset.
P0620
Alternator control circuit
Prohibits alternator output suppression control against current consumers. (Operates as a normal alternator.)
P0622
Alternator FR terminal system
Prohibits alternator output suppression control against current consumers. (Operates as a normal alternator.)
P0638
Throttle valve control servo circuit range/performance problem
Throttle opening degree position is in default position.
P0642
Throttle position sensor power supply
Throttle opening degree position is in default position.
P0657
Throttle valve control servo relay circuit malfunction
Throttle opening degree position is in default position.
P1231
Trustful check active stability control (ASC)
Torque requested by active stability control (ASC) is ignored.
P1238
Air flow sensor trustful for torque monitoring
Throttle opening degree position is in default position.
P1240
Trustful check ignition angle
Ignition retard is not carried out.
P1242
Fail safe control monitoring
Throttle opening degree position is in default position.
P1243
Inquiry/response error
Microcomputer is reset.
P1247
Trustful Check CVT
Torque requested by CVT-ECU is ignored.
P1590
CVT-ECU to engine-ECU communication error in torque reduction request
Engine output is restricted.
P1603
Battery backup circuit malfunction
All diagnosis codes are stored once failure judgement is completed.
P1608
Battery current sensor system
Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P2100
Throttle valve control servo circuit (open)
Throttle opening degree position is in default position.
P2101
Throttle valve control servo magneto malfunction
Throttle opening degree position is in default position.
P2122
Accelerator pedal position sensor (main) circuit low input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (sub) fails.

P2123
Accelerator pedal position sensor (main) circuit high input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (sub) fails.

P2127
Accelerator pedal position sensor (sub) circuit low input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (main) fails.

P2128
Accelerator pedal position sensor (sub) circuit high input

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (main) fails.

P2135
Throttle position sensor (main and sub) circuit range/performance problem
Throttle opening degree position is in default position.
P2138
Accelerator pedal position sensor (main and sub) circuit range/performance

  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (sub) fails.

P2228
Barometric pressure sensor circuit low input
Control as if the barometric pressure is 101 kPa.
P2229
Barometric pressure sensor circuit high input
Control as if the barometric pressure is 101 kPa.
P2253
Oxygen sensor offset circuit high voltage
Does not control air-fuel ratio closed loop.
P2646
Valve lift control motor control performance

  • The valve lift is fixed to maximum. Otherwise, deenergises the motor.
  • V.V.T. phase angle is set to most retarded position.

P2648
Valve lift control motor coil open
Deenergises the valve lift control motor.
P2649
Valve lift control motor over current
Deenergises the valve lift control motor.
P264B
Valve lift sensor poor sensitivity

  • The valve lift is fixed to maximum. Otherwise, deenergises the motor.
  • V.V.T. phase angle is set to most retarded position.

P264C
Valve lift sensor circuit low input

  • The valve lift is fixed to maximum. Otherwise, deenergises the motor.
  • V.V.T. phase angle is set to most retarded position.

P264D
Valve lift sensor circuit high input

  • The valve lift is fixed to maximum. Otherwise, deenergises the motor.
  • V.V.T. phase angle is set to most retarded position.

P265B
Abnormal hall sensor implanted into valve lift control motor
Deenergises the valve lift control motor.
U011B
Valve lift ECU time-out

  • The valve lift is fixed to maximum. Otherwise, deenergises the motor.
  • V.V.T. phase angle is set to most retarded position.

U0167
KOS-ECU communication error
Engine start is prohibited.
U0415
ASC-ECU CAN data abnormality
Torque requested by active stability control (ASC) is ignored.
U1004
AS&G-ECU time-out <Vehicles with AS&G system>
Disables idling stop.