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.

ENGINE WARNING LAMP INSPECTION ITEMS
Code No.
 Diagnosis item
-
 Engine-ECU
P0105*
 Manifold absolute pressure sensor system
P0110*
 Intake air temperature sensor system <134>
P0110
 Intake air temperature sensor system <3A9>
P0115
 Engine coolant temperature sensor system
P0122*
 Throttle position sensor (main) circuit low input
P0123*
 Throttle position sensor (main) circuit high input
P0125*
 Feedback system monitor
P0130
 Oxygen sensor (front) system
P0135
 Oxygen sensor (front) heater system
P0136
 Oxygen sensor (rear) system
P0140
 Oxygen sensor (rear) circuit no activity detected <3A9>
P0141
 Oxygen sensor (rear) heater system
P0170
 Abnormal fuel system
P0201
 No. 1 injector system
P0202
 No. 2 injector system
P0203
 No. 3 injector system
P0222*
 Throttle position sensor (sub) circuit low input
P0223*
 Throttle position sensor (sub) circuit high input
P0300
 Random/multiple cylinder misfire detected
P0301
 No. 1 cylinder misfire detected
P0302
 No. 2 cylinder misfire detected
P0303
 No. 3 cylinder misfire detected
P0325
 Detonation sensor system
P0335*
 Crank angle sensor system <134>
P0335
 Crank angle sensor system <3A9>
P0340
 Camshaft position sensor system
P0420
 Catalyst malfunction
P0443
 Purge control solenoid valve system
P0500
 Vehicle speed signal system
P0513
 Immobilizer malfunction <134>
P0606*
 Engine-ECU main processor malfunction
P0638*
 Throttle valve control servo circuit range/performance problem
P0657*
 Throttle valve control servo relay circuit malfunction
P1603*
 Battery backup circuit malfunction
P1630*
 Variant coding errors
P1961*
 Trustful check throttle position sensor (main)
P1962*
 Trustful check throttle position sensor (sub)
P1963*
 Trustful check manifold absolute pressure sensor
P1964*
 AD converter
P1965*
 Trustful check accelerator pedal position sensor
P1966*
 Manifold absolute pressure sensor trustful for torque monitoring
P1967*
 Trustful check engine speed
P1970*
 Torque monitoring
P1978*
 Throttle valve control servo malfunction
P2100*
 Throttle valve control servo circuit (open)
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
U1108
 Combination meter time-out
note
  • If the electronic-controlled throttle valve system is stopped due to the fail-safe function, the engine warning lamp should blink.
  • If the engine warning lamp illuminates because of a malfunction of the engine-ECU, communication between M.U.T.-III and the engine-ECU is impossible. In this case, the diagnosis code cannot be read.
  • 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 "*" in the diagnosis code number column, the engine warning lamp illuminates only on the first detection of the malfunction.
  • 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.

AS&G OFF INDICATOR LAMP <Vehicles with AS&G system>

When depressing the Auto Stop & Go (AS&G) OFF switch for the specified time, the AS&G mode is turned OFF and the AS&G OFF indicator lamp is lit. When the following items in the table, related to the Auto Stop & Go (AS&G) system, are abnormal, the AS&G OFF indicator lamp blinks. When the AS&G OFF indicator lamp continues to blink, check the output of the diagnosis code. After the ignition switch is turned ON, light the AS&G OFF indicator lamp for several seconds to confirm whether the lamp is normally operated.

ENGINE WARNING LAMP INSPECTION ITEMS
Code No.
 Diagnosis item
-
 Engine-ECU
P0105*
 Manifold absolute pressure sensor system
P0110*
 Intake air temperature sensor system <134>
P0110
 Intake air temperature sensor system <3A9>
P0115
 Engine coolant temperature sensor system
P0122*
 Throttle position sensor (main) circuit low input
P0123*
 Throttle position sensor (main) circuit high input
P0125*
 Feedback system monitor
P0130
 Oxygen sensor (front) system
P0135
 Oxygen sensor (front) heater system
P0136
 Oxygen sensor (rear) system
P0140
 Oxygen sensor (rear) circuit no activity detected <3A9>
P0141
 Oxygen sensor (rear) heater system
P0170
 Abnormal fuel system
P0201
 No. 1 injector system
P0202
 No. 2 injector system
P0203
 No. 3 injector system
P0222*
 Throttle position sensor (sub) circuit low input
P0223*
 Throttle position sensor (sub) circuit high input
P0300
 Random/multiple cylinder misfire detected
P0301
 No. 1 cylinder misfire detected
P0302
 No. 2 cylinder misfire detected
P0303
 No. 3 cylinder misfire detected
P0325
 Detonation sensor system
P0335*
 Crank angle sensor system <134>
P0335
 Crank angle sensor system <3A9>
P0340
 Camshaft position sensor system
P0420
 Catalyst malfunction
P0443
 Purge control solenoid valve system
P0500
 Vehicle speed signal system
P0513
 Immobilizer malfunction <134>
P0606*
 Engine-ECU main processor malfunction
P0638*
 Throttle valve control servo circuit range/performance problem
P0657*
 Throttle valve control servo relay circuit malfunction
P1603*
 Battery backup circuit malfunction
P1630*
 Variant coding errors
P1961*
 Trustful check throttle position sensor (main)
P1962*
 Trustful check throttle position sensor (sub)
P1963*
 Trustful check manifold absolute pressure sensor
P1964*
 AD converter
P1965*
 Trustful check accelerator pedal position sensor
P1966*
 Manifold absolute pressure sensor trustful for torque monitoring
P1967*
 Trustful check engine speed
P1970*
 Torque monitoring
P1978*
 Throttle valve control servo malfunction
P2100*
 Throttle valve control servo circuit (open)
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
U1108
 Combination meter time-out

ITEMS TO BLINK AS&G OFF INDICATOR LAMP
Code No.
 Diagnosis item
P0515
 Battery temperature sensor system
P0555
 Brake vacuum sensor system
P0622
 Alternator FR terminal circuit system
P0817
 Starter cut relay system
P0820
 Neutral position sensor system
P0830
 Clutch switch (A) system
P0833
 Clutch switch (B) system
P1608
 Battery current sensor system

AS&G INDICATOR LAMP <Vehicles with AS&G system>

When the specified conditions are satisfied during the engine operation, the engine-ECU stops the engine. At that time, the AS&G indicator lamp is lit. If the following items in the table, related to the Auto Stop & Go (AS&G) system, are applied, the AS&G indicator lamp blinks. When the AS&G indicator lamp continues to blink, carry out the check according to the applied item. After the ignition switch is turned ON, light the AS&G indicator lamp for several seconds to confirm whether the lamp is normally operated.

AS&G OFF INDICATOR LAMP <Vehicles with AS&G system>



ITEMS TO BLINK AS&G INDICATOR LAMP
Items
 Diagnosis item
Learning the neutral position is not completed.
 Carry out the learning of the neutral position.(Refer to GROUP 00 - Precautions Before Service - Learning Procedure For Neutral Position <Vehicles with AS&G system> )
The hood is opened.
 Confirm the hood is securely closed. When starting the engine, use the key to start the engine because the auto start is prohibited if the hood is opened during the auto stop.
The driver’s seat belt is unfastened.
 Confirm the driver’s seat belt is securely fastened. When starting the engine, use the key to start the engine because the auto start is prohibited if the driver’s seat belt is unfastened during the auto stop.
The shift lever is operated during the auto stop. (the ETACS sounds the warning buzzer except the neutral position.)
 Confirm the shift lever is in the neutral position.

METHOD OF READING AND ERASING DIAGNOSIS CODES
Refer to , GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Diagnosis Function.

INSPECTION USING M.U.T.-III 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 harness and components.
2.After repairing, re-check using the M.U.T.-III 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 M.U.T.-III, and then start the engine again and carry out a road test to confirm that the problem has disappeared.

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 sensor
 °C
Engine speed (Crank angle sensor)
r/min
Vehicle speed
 km/h
Manifold absolute pressure sensor
 kPa
Ignition advance
 deg
Long-term fuel compensation
 %
Short-term fuel compensation
 %
Fuel control condition
 Open loop
 OL
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 sensor
 CL- HO2S
Calculation load value
 %
Throttle position sensor (main)
 %
Frequency counter*
 -
Engine warning lamp distance
 -
note If when the data in the block 2 is updated, that in the block 1 is also updated.

DRIVE CYCLE


The following three drive cycle patterns are performed on the diagnosis codes monitored during the vehicle driving. The vehicle driving requires the patterns to identify the fault. In other words, doing such a drive allows to regenerate any kind of trouble which involves illuminating the engine warming lamp (check engine lamp) and to verify the repair procedure has eliminated the trouble [the engine warming lamp (check engine lamp) is no longer illuminated].
caution Two technicians should always be in the vehicle when carrying out a test drive.
note Check that the diagnosis code is not output before traveling in the drive cycle pattern. Erase the diagnosis code if it has been output.

DRIVE CYCLE PATTERN LIST
Procedure
 Monitor item
 Diagnosis code No.
1
 Catalytic converter monitor
 P0420
2
 Oxygen sensor (front) monitor
 P0130
3
 Other monitor
 P0135, P0136, P0141, P0300, P0301, P0302, P0303, P0325, P0500, P0638

Procedure 1


Catalytic converter monitor
Diagnosis code No.
 P0420
Drive cycle pattern
 One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed while traveling with the following drive cycle pattern. It will take 16 minutes or more.
Inspection condition
  • Atmospheric temperature: -10°C or more
Test procedure
  1. Engine: start
  2. Accelerate until the vehicle speed is 90 km/h or more.
  3. Travel for 6 minutes or more while keeping the vehicle speed at 90 km/h or more.
  4. Decelerate until the vehicle speed is within 80 km/h or less.
  5. While traveling at 55 - 80 km/h for 10 minutes or more, fully close the throttle at least once in 2 minutes and decelerate for 10 seconds or more.

    • Do not repeat deceleration too often.
    • Vehicle speed may go below 55 km/h after the deceleration.
    • Stopping and braking are permitted. (If stopped or drive at 55 km/h or less for more than 5 minutes the monitoring may be stopped. In this case please restart monitoring from the beginning.)
  6. After completing the above deceleration, bring the vehicle speed back to 55 - 80 km/h and keep it in the range until starting the deceleration again.

    • Repeat the above deceleration at least 5 times.
  7. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

Procedure 2


Oxygen sensor (front) monitor
Diagnosis code No.
 P0130
Drive cycle pattern
 One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed while traveling with the following drive cycle pattern. It will take 16 minutes or more.
Inspection conditions
  • Engine coolant temperature: After engine warm up
  • Atmospheric temperature: -10°C or more
Test procedure
  1. Engine: start
  2. Accelerate until the vehicle speed is 55 - 80 km/h.
  3. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 55 - 80km/h and travel for 16 minutes or more.

    • Stopping and braking during this operation are permitted.
  4. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

Procedure 3


Other monitor
Diagnosis code No.
 P0135, P0136, P0141, P0300, P0301, P0302, P0303, P0325, P0500, P0638
Drive cycle pattern
 One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed while traveling with the following drive cycle pattern. It will take 21 minutes or more.
Inspection conditions
  • Engine coolant temperature: After engine warm up
  • Atmospheric temperature: -10°C or more
Test procedure
  1. Engine: start
  2. Accelerate until the vehicle speed is 55 km/h.
  3. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 55 km/h and travel for 16 minutes or more.
  4. Return the vehicle to the shop.
  5. After stopping the vehicle, continue idling for 5 minutes, and then turn the ignition switch to "LOCK" (OFF) position.

READINESS TEST STATUS
The engine-ECU 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 M.U.T.-III. (If the ECU has judged a item before, the M.U.T.-III displays "Completed").
In addition, if diagnosis codes are erased or the battery cable is disconnected, this history will also be erased (the memory will be reset).
Continuously monitoring
  • Comprehensive Component Monitor (Sensor and actuator)
  • Fuel System Monitoring: P0170
  • Misfire Monitoring: P0300
Non-continuously monitoring
  • EGR System Monitoring: Not supported
  • Oxygen Sensor Monitoring: P0130, P0136
  • Oxygen Sensor Heater Monitoring: P0135, P0141
  • A/C Refrigerant Monitoring: Not supported
  • Secondary Air System Monitoring: Not supported
  • Evaporative System Monitoring: Not supported
  • Heated Catalyst Monitoring: Not supported
  • Catalyst Monitoring: P0420

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
Intake air temperature sensor
 Controls as if the intake air temperature is 25°C.
Manifold absolute pressure sensor
 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.
Throttle position sensor (main)
  • Controls the throttle valve position through the use of the throttle position sensor (sub) signal.
  • Renders the amount of accelerator pedal travel as being approximately one-half the normal opening angle.
  • Prohibits the operation of the engine speed feedback control.
  • Cuts off fuel when the engine speed exceeds 3,000 r/min.
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the throttle position sensor (sub) is also malfunctioning.
Throttle position sensor (sub)
  • Controls the throttle valve position through the use of the throttle position sensor (main) signal.
  • Renders the amount of accelerator pedal travel as being approximately one-half the normal opening angle.
  • Cuts off fuel when the engine speed exceeds 3,000 r/min.
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the throttle position sensor (main) is also malfunctioning.
Accelerator pedal position sensor (main)
  • Detects the amount of the accelerator pedal travel through the use of the accelerator pedal position sensor (sub) signal, but rendering it only as being approximately one-half the normal opening angle.
  • Cuts off fuel when the engine speed exceeds 3,000 r/min.
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the accelerator pedal position sensor (sub) is also malfunctioning.
Accelerator pedal position sensor (sub)
  • Detects the amount of the accelerator pedal travel through the use of the accelerator pedal position sensor (main) signal, but rendering it only as being approximately one-half the normal opening angle.
  • Cuts off fuel when the engine speed exceeds 3,000 r/min.
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the accelerator pedal position sensor (main) is also malfunctioning.
Engine coolant temperature sensor
 Controls as if the engine coolant temperature is 80°C. (This control will be continued until the ignition switch is turned to the "LOCK" (OFF) position even though the sensor signal returns to normal.)
Camshaft position sensor
 Injects fuel into the cylinders in the order 1-3-2 with irregular timing. (After the ignition switch is turned to the "ON" position, the No. 1 cylinder top dead center is not detected at all.)
Oxygen sensor <front>
 Air/fuel ratio closed loop control is not performed.
Oxygen sensor <rear>
 Performs the closed loop control of the air/fuel ratio by using only the signal of the oxygen sensor (front) installed on the front side of the catalytic converter.
Detonation sensor
 Switches the ignition timing from ignition timing for high octane to ignition timing for standard octane fuel.
Neutral position sensor <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited. If the malfunction is detected during the auto stop, the auto start is prohibited.
Clutch switch (A) <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited.
Clutch switch (B) <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited.
Starter cut relay monitor <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited. If the malfunction is detected during the auto stop, the auto start is prohibited.
Brake vacuum sensor <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited. If the malfunction is detected during the auto stop, the auto start is prohibited.
Battery current sensor <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited. If the malfunction is detected during the auto stop, the auto start is prohibited.
Battery temperature sensor <Vehicles with AS&G system>
 In the normal operation, the auto stop is prohibited. If the malfunction is detected during the auto stop, the auto start is prohibited.
Ignition coil (incorporating power transistor)
 Cuts off the fuel supply to cylinders with an abnormal ignition.
Alternator FR terminal
 Does not control the output of the alternator according to an electrical load. (works as a normal alternator)
Misfiring
 If the detected misfiring causes damage to the catalyst, the misfiring cylinder will be shut down.
Throttle valve position feedback
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system.
  • Prohibits the operation of the engine speed feedback control.
Throttle valve control servo
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system.
  • Prohibits the operation of the engine speed feedback control.
Engine-ECU main processor
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system.
  • Prohibits the operation of the engine speed feedback control.
Communication between powertrain control module main processor and system LSI
  • Renders the amount of accelerator pedal travel as being approximately one-half the normal opening angle.
  • Prohibits the operation of the engine speed feedback control.
  • Cuts off fuel when the engine speed exceeds 3,000 r/min.
Intake air monitor
  • Suppresses the engine output by stopping the electronic-controlled throttle valve system.
  • Prohibits the operation of engine speed feedback.