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 engine warning lamp-related circuit is normal, the engine warning lamp will illuminate as a bulb check by turning on the ignition switch and then go out after the engine starts.

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 <Vehicles with dual oxygen sensors>
P0038	Oxygen sensor (rear) heater circuit high input <Vehicles with dual oxygen sensors>
P0068^*1	Trustful check manifold absolute pressure sensor
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^*1	Oxygen sensor (front) circuit no activity detected
P0137	Oxygen sensor (rear) circuit low voltage <Vehicles with dual oxygen sensors>
P0138	Oxygen sensor (rear) circuit high voltage <Vehicles with dual oxygen sensors>
P0140	Oxygen sensor (rear) circuit no activity detected <Vehicles for Argentina, Chile and Thailand>
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
P0300^*2	Random/multiple cylinder misfire detected <Vehicles with dual oxygen sensors>
P0301^*2	No. 1 cylinder misfire detected <Vehicles with dual oxygen sensors>
P0302^*2	No. 2 cylinder misfire detected <Vehicles with dual oxygen sensors>
P0303^*2	No. 3 cylinder misfire detected <Vehicles with dual oxygen sensors>
P0335^*1	Crank angle sensor system
P0340^*1	Camshaft position sensor system
P0350^*1	Ignition coil primary circuit malfunction <Vehicles with single oxygen sensor>
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>
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
P1238^*1	Manifold absolute pressure sensor trustful for torque monitoring
P1590	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
P2252	Oxygen sensor offset circuit low voltage
P2253	Oxygen sensor offset circuit high voltage
U0101	CVT-ECU time-out <CVT>
U0121^*1	ABS-ECU time-out <Vehicles with ABS>
U0155	Combination meter 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.

FCM-LS AND RMS (FORWARD) INDICATOR LAMP AND FCM-LS AND RMS (FORWARD) OFF INDICATOR LAMP <VEHICLES WITH FCM-LS>

When an error occurs on the following items related to the Radar sensing misacceleration Mitigation System (RMS) (Forward), the engine-ECU turns on the FCM-LS and RMS (Forward) indicator lamp and FCM-LS and RMS (Forward) OFF indicator lamp and performs the fail-safe control. When the indicator lamps turn on, the set diagnosis code is checked.
In addition, the engine-ECU flashes the FCM-LS and RMS (Forward) indicator lamp and sounds the buzzer while the RMS (Forward) is operating.
The FCM-LS and RMS (Forward) indicator lamp and FCM-LS and RMS (Forward) OFF indicator lamp turn on before the engine is started. However, this phenomenon is for checking the lamps, not a lamp failure.

note

When the FCM-ECU has detected a failure of the FCM-LS, the set FCM-LS diagnosis code is checked to turn on the FCM-LS and RMS (Forward) indicator lamp and FCM-LS and RMS (Forward) OFF indicator lamp. (Refer to GROUP 54A - Forward Collision Mitigation System (Low speed range) (FCM-LS), Troubleshooting, Diagnosis function

FCM-LS AND RMS (FORWARD) INDICATOR LAMP AND FCM-LS AND RMS (FORWARD) OFF INDICATOR LAMP INSPECTION ITEMS

Item	Check contents
P0122^*	Throttle position sensor (main) circuit low input
P0123^*	Throttle position sensor (main) circuit high input
P0222^*	Throttle position sensor (sub) circuit low input
P0223^*	Throttle position sensor (sub) circuit high input
P0606^*	Engine-ECU main processor malfunction
P0638^*	Throttle valve control servo circuit range/performance problem
P0642^*	Throttle position sensor power supply
P0657^*	Throttle valve control servo relay circuit malfunction
P1570	Failure Signal Received from Laser Radar (FCM-ECU)
P170E	ASC Error Information
P2100^*	Throttle valve control servo circuit (open)
P2101^*	Throttle valve control servo magneto malfunction
P2122^*	Accelerator pedal position sensor (main) circuit low input
P2123^*	Accelerator pedal position sensor (main) circuit high input
P2127^*	Accelerator pedal position sensor (sub) circuit low input
P2128^*	Accelerator pedal position sensor (sub) circuit high input
P2135^*	Throttle position sensor (main and sub) range/performance problem
P2138^*	Accelerator pedal position sensor (main and sub) range/performance problem
U0101^*	CVT-ECU time-out
U0121	ABS-ECU/ASC-ECU time-out
U0126	Steering Wheel Sensor Time-out
U0155^*	Combination meter time-out
U1011	Laser Radar (FCM-ECU) Parity/Toggle Bit Error
U1073	Bus-off
U1220	ASC Parity/Toggle Bit Error
U15A0	Laser Radar (FCM-ECU) Time-out

note

For the diagnosis codes marked by *, the engine warning lamp (check engine lamp) will also illuminates.

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 DATA LIST AND ACTUATOR TEST

Reading data list 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 data list while in the actuator test the actuator can be forced to drive (ON/OFF driving in the specified time).

DIAGNOSIS PROCEDURE

Connect M.U.T.-III to perform inspection with the data list and actuator test function.
If any abnormality is found, inspect and repair vehicle body harnesses and components.
After repair, check that input and output have returned to normal.
If a failure code which is caused by inspection and repair work is generated, erase the failure code.
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

After the ignition switch is in "LOCK" (OFF) position, connect the M.U.T.-III to the diagnosis connector.
Turn the ignition switch to the "ON" position.
Select "MPI/GDI/DIESEL" from System select Screen of the M.U.T.-III.
Select "Special Function" from MPI/GDI/DIESEL Screen.
Select "Provisional DTCs" from Special Function Screen.

FREEZE FRAME DATA

When the engine-ECU detects a malfunction and sets a diagnosis code, it also stores a current status of the engine. This function is called "Freeze frame data". By analysing 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
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	%
C6^*2	Long term fuel trim 1	%
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^*5	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	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: 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 set. 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 retarded angle.
P0068	Trustful check manifold absolute pressure sensor	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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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.
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.).
P0350	Ignition coil primary circuit malfunction <Vehicles with single oxygen sensor>	Does not control air-fuel ratio closed loop.
P0513	Immobilizer system	Engine start is prohibited.
P0515	Battery temperature sensor system <Vehicles for Thailand>	Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P0537	Fin thermo sensor circuit low input	Control as if the evaporator surface temperature is -6.4°C.
P0538	Fin thermo sensor circuit high input	Control as if the evaporator surface temperature is -6.4°C.
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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 <Vehicles for Thailand>	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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
P0642	Throttle position sensor power supply	Throttle opening degree position is in default position. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
P0657	Throttle valve control servo relay circuit malfunction	Throttle opening degree position is in default position. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
P1231	Trustful check active stability control (ASC) <Vehicles with ASC>	Ignores a torque request by the ASC.
P1238	Manifold absolute pressure 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) <Vehicles for Thailand>	Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P1538	LIN communication error (receiving message from battery current sensor) <Vehicles for Thailand>	Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P1570	Failure Signal Received from Laser Radar (FCM-ECU) <Vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.
P1590	CVT-ECU to Engine-ECU communication error in torque reduction request <CVT>	Engine output is restricted.
P1603	Battery backup circuit malfunction	All diagnosis codes are set once failure judgement is completed.
P1608	Battery current sensor system <Vehicles for Thailand>	Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P1611	Battery voltage sensor circuit <Vehicles for Thailand>	Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P170E	ABS/ASC error Information <vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.
P2100	Throttle valve control servo circuit (open)	Throttle opening degree position is in default position. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
P2101	Throttle valve control servo magneto malfunction	Throttle opening degree position is in default position. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
P2135	Throttle position sensor (main and sub) circuit range/performance problem	Throttle opening degree position is in default position. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
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. The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
P2253	Oxygen sensor offset circuit high voltage	Does not control air-fuel ratio closed loop.
U0101	CVT-ECU time-out <CVT>	The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
U0121	ABS-ECU/ASC-ECU time-out	The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
U0126	Steering Wheel Sensor Time-out <Vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.
U0155	Combination meter time-out	The RMS (Forward) and FCM-LS are prohibited. <Vehicles with FCM-LS>
U0167	KOS&OSS-ECU communication error	Engine start is prohibited.
U1011	Laser Radar (FCM-ECU) Parity/Toggle Bit Error <Vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.
U1073	Bus-off <Vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.
U1220	ASC Parity/Toggle Bit Error <Vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.
U15A0	Laser Radar (FCM-ECU) Time-out <Vehicles with FCM-LS>	The RMS (Forward) and FCM-LS are prohibited.