DIAGNOSIS FUNCTION



ENGINE WARNING LAMP (CHECK ENGINE LAMP)



If an abnormality occurs in any of the following items related to the Multipoint Fuel Injection (MPI) system, the engine warning lamp will illuminate.
If the lamp remains illuminated or if the lamp illuminates while the engine is running, check the diagnosis code output.
note When the ignition switch is ON, for the engine warning lamp circuit and bulb check the engine warning lamp lights up for a few seconds.


ENGINE WARNING LAMP INSPECTION ITEMS
Code No.
Diagnosis item
-
Engine-ECU
P0090
Fuel pressure control solenoid valve system
P0100
Air flow sensor system
P0110
Intake air temperature sensor system
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
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
P0204
No. 4 injector system
P0222*
Throttle position sensor (sub) circuit low input
P0223*
Throttle position sensor (sub) circuit high input
P0243
Waste gate solenoid valve system
P0300
Random/multiple cylinder misfire detected
P0301
No. 1 cylinder misfire detected
P0302
No. 2 cylinder misfire detected
P0303
No. 3 cylinder misfire detected
P0304
No. 4 cylinder misfire detected
P0325
Detonation sensor system
P0335
Crank angle sensor system
P0340
Camshaft position sensor system
P0420
Catalyst malfunction
P0443
Purge control solenoid valve system
P0500*
Vehicle speed signal system
P0603*
EEP ROM malfunction
P0638*
Throttle valve control servo circuit range/performance problem
P0657*
Throttle valve control servo relay circuit malfunction
P1021
Oil control valve system
P1603*
Battery backup circuit malfunction
P1630*
Variant coding errors
P1964*
AD converter
P1965*
Trustful check accelerator pedal position sensor
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 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.
  • After the engine warning lamp illuminates, it will be switched off under the following conditions.

    • When the engine-ECU monitored the power train malfunction three times* met set condition requirements, it detected no malfunction.
      *: In this case, "one time" indicates from engine start to stop.
    • For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature, etc.) are similar to those when the malfunction was first recorded.

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
Air flow sensor
g/s
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 *: 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, P0304, 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, P0304, 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 Heater Monitoring: P0130, P0136
  • Oxygen Sensor 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 50°C.
Air flow 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 1-3-4-2 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.
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 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.

Oil control valve

  • Do not switch to high-speed cam.
  • Cut off fuel when the engine speed exceeds 5,000 r/min.






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