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 is illuminated. 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. There are two methods for checking the indicator lamp burn out: When the ignition switch is in "ON" position, the indicator lamp is illuminated, and then extinguished few seconds later. When the ignition switch is in "ON" position and the engine starts, the indicator lamp is extinguished.
note When the A/T-ECU detects malfunctions related to the automatic transmission, the engine warning lamp is also illuminated.

ENGINE WARNING LAMP INSPECTION ITEMS


caution The engine warning lamp continuously illuminates when the engine-ECU malfunctions.
Code No.
 Diagnosis item
P001A
 Oil feeder control valve system
P0031
 Right bank oxygen sensor (front) heater circuit low input
P0032
 Right bank oxygen sensor (front) heater circuit high input
P0037
 Right bank oxygen sensor (rear) heater circuit low input
P0038
 Right bank oxygen sensor (rear) heater circuit high input
P0051
 Left bank oxygen sensor (front) heater circuit low input
P0052
 Left bank oxygen sensor (front) heater circuit high input
P0057
 Left bank oxygen sensor (rear) heater circuit low input
P0058
 Left bank 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
 Right bank oxygen sensor (front) circuit low voltage
P0132
 Right bank oxygen sensor (front) circuit high voltage
P0133
 Right bank oxygen sensor (front) circuit slow response
P0134*1
 Right bank oxygen sensor (front) circuit no activity detected
P0137
 Right bank oxygen sensor (rear) circuit low voltage
P0138
 Right bank oxygen sensor (rear) circuit high voltage
P0151
 Left bank oxygen sensor (front) circuit low voltage
P0152
 Left bank oxygen sensor (front) circuit high voltage
P0153
 Left bank oxygen sensor (front) circuit slow response
P0154*1
 Left bank oxygen sensor (front) circuit no activity detected
P0157
 Left bank oxygen sensor (rear) circuit low voltage
P0158
 Left bank oxygen sensor (rear) circuit high voltage
P0171
 Right bank abnormal fuel system (lean)
P0172
 Right bank abnormal fuel system (rich)
P0174
 Left bank abnormal fuel system (lean)
P0175
 Left bank 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
P0273
 No. 5 injector circuit low input
P0274
 No. 5 injector circuit high input
P0276
 No. 6 injector circuit low input
P0277
 No. 6 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
P0305*2
 No. 5 cylinder misfire detected
P0306*2
 No. 6 cylinder misfire detected
P0335*1
 Crank angle sensor system
P0340*1
 Camshaft position sensor system
P0421
 Warm up catalyst malfunction (right bank)
P0431
 Warm up catalyst malfunction (left bank)
P0458
 Purge control solenoid valve circuit low input
P0459
 Purge control solenoid valve circuit high input
P0602*1
 Variant coding system
P0604*1
 RAM error
P0606*1
 Engine-ECU main processor malfunction
P060B*1
 A/D converter
P060D*1
 Trustful check accelerator pedal position sensor
P061A
 Torque monitoring
P061C
 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
P1238*1
 Air flow sensor trustful for torque monitoring
P1590*1
 A/T-ECU to engine-ECU communication error in torque reduction request
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
U0101*1
 A/T-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 is illuminated at the time.
  • 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.

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 sets 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 sets the diagnosis code. On the M.U.T.-III, it is possible to display the set 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.

CHECKING FREEZE FRAME DATA


When the engine-ECU determines a malfunction and sets the diagnosis code, it stores a sensor input condition and control condition during malfunction detection for each detected diagnosis code. The data of this function is called freeze frame data.
Analysing this freeze frame data with M.U.T.-III allows for efficient troubleshooting. The display items of freeze frame data are shown below.

DISPLAY ITEM LIST
Item No.
 Data 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)
 %
BA*2
 Target EGR
 %
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 (open loop-drive condition)*5
  • OL: SYS (open loop-system failure)*6
  • CL: HO2S (closed loop-system failure)*7
C1*2
 Fuel system status 2
  • CL (closed loop)*3
  • OL (open loop)*4
  • OL: DRV (open loop-drive condition)*5
  • OL: SYS (open loop-system failure)*6
  • CL: HO2S (closed loop-system failure)*7
C2*2
 Calculated load value
 %
C3*2
 Engine coolant temperature sensor
 °C
C4*2
 Short term fuel trim 1
 %
C6*2
 Long term fuel trim 1
 %
C8*2
 Short term fuel trim 2
 %
CA*2
 Long term fuel trim 2
 %
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
 °C
D1*2
 Time since engine running*8
 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
 °C
DC*2
 Throttle actuator
 %
DD*2
 Relative accelerator pedal position sensor
 %
note *1: Accumulated time from malfunction detection up to now
note *2: The items of Freeze Frame Data can be seen by selecting "Freeze Frame Data (OBD)" on "Self-diagnosis" screen of M.U.T.-III. When system malfunctions are detected, the first detected malfunction data only is stored.
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: Condition of open loop due to acceleration and deceleration driving
note *6: Condition of open loop due to system failure
note *7: Condition of closed loop due to system failure
note *8: Time between engine start and malfunction detection

FAIL-SAFE AND BACKUP FUNCTION


This function exercises control, by predetermined control logic, to keep a condition in which a vehicle can be safely driven when main sensor failures are detected by the diagnosis function.

List of fail-safe and backup function items
Code No.
 Diagnosis item
 Control content during malfunction
P001A
 Oil feeder control valve system
 Does not switch to high-speed cam.
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.
P0305
 No. 5 cylinder misfire detected
 The supply of fuel to the misfiring cylinder can possibly be cut.
P0306
 No. 6 cylinder misfire detected
 The supply of fuel to the misfiring cylinder can possibly be cut.
P0327
 Right bank detonation sensor circuit low input
 Fix the ignition timing with an allowance against detonation.
P0328
 Right bank detonation sensor circuit high input
 Fix the ignition timing with an allowance against detonation.
P0332
 Left bank detonation sensor circuit low input
 Fix the ignition timing with an allowance against detonation.
P0333
 Left bank detonation sensor circuit high input
 Fix the ignition timing with an allowance against detonation.
P0335
 Crank angle sensor system
 Engine stops.
P0340
 Camshaft position sensor system
  • Engine runs in learned pattern until engine stops.
  • After stopping the engine, do not start the engine.
  • Does not switch to high-speed cam.
P0513
 Immobilizer malfunction
 Engine start is prohibited.
P0515
 Battery temperature sensor system
 Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.).
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.
P1537
 LIN communication error (sending message to battery current sensor)
 Prohibits alternator output suppression control against current consumers (operates as a normal alternator.).
P1538
 LIN communication error (receiving message from battery current sensor)
 Prohibits alternator output suppression control against current consumers (operates as a normal alternator.).
P1590
 A/T-ECU to engine-ECU communication error in torque reduction request
 Engine output is restricted.
P1603
 Battery backup circuit malfunction
 All diagnosis codes are set once failure judgement is completed.
P1608
 Battery current sensor system
 Prohibits alternator output suppression control against current consumers (operates as a normal alternator.).
P1611
 Battery voltage 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.
U0167
 Immobilizer communication error
 Engine start is prohibited.
U0415
 ASC-ECU CAN data abnormality
 Torque requested by active stability control (ASC) is ignored.
U1005
 Clearance warning control unit time-out
 Torque requested by clearance warning control unit is ignored.