DIAGNOSIS FUNCTION


ENGINE WARNING LAMP (CHECK ENGINE LAMP)

Engine warning lamp is lit when any abnormality takes place in the item related to electronically controlled fuel injection system shown in the following table.
If the malfunction indicator lamp has been on and/or is lit when the engine is in operation, check the diagnosis output.

ENGINE WARNING LAMP INSPECTION ITEMS
Code No.
 Diagnosis item
-
 Engine-ECU
P0016*
 Crank angle sensor/camshaft position sensor phase problem
P0072
 No. 2 intake air temperature sensor circuit low input
P0073
 No. 2 intake air temperature sensor circuit high input
P0088*
 Common rail pressure malfunction
P0089*
 Suction control valve stuck
P0093*
 Fuel leak problem
P0102
 Air flow sensor circuit low input
P0103
 Air flow sensor circuit high input
P0106
 Manifold absolute pressure sensor range/performance problem
P0107
 Manifold absolute pressure sensor circuit low input
P0108
 Manifold absolute pressure sensor circuit high input
P0112
 No. 1 intake air temperature sensor circuit low input
P0113
 No. 1 intake air temperature sensor circuit high input
P0117
 Engine coolant temperature sensor circuit low input
P0118
 Engine coolant temperature sensor circuit high input
P0122
 Throttle position sensor circuit low input
P0123
 Throttle position sensor circuit high input
P0182
 Fuel temperature sensor circuit low input
P0183
 Fuel temperature sensor circuit high input
P0191*
 Rail pressure sensor range/performance problem
P0192*
 Rail pressure sensor low input
P0193*
 Rail pressure sensor high input
P0201*
 No. 1 injector circuit malfunction
P0202*
 No. 2 injector circuit malfunction
P0203*
 No. 3 injector circuit malfunction
P0204*
 No. 4 injector circuit malfunction
P0234*
 Turbocharger over boost condition
P0301
 No. 1 cylinder injector malfunction (No injection)
P0302
 No. 2 cylinder injector malfunction (No injection)
P0303
 No. 3 cylinder injector malfunction (No injection)
P0304
 No. 4 cylinder injector malfunction (No injection)
P0335*
 Crank angle sensor system
P0336*
 Crank angle sensor range/performance problem
P0340*
 Camshaft position sensor system
P0341*
 Camshaft position sensor range/performance problem
P0403
 Exhaust gas recirculation valve (DC motor) malfunction
P0405
 Exhaust gas recirculation valve position sensor circuit low input
P0406
 Exhaust gas recirculation valve position sensor circuit high input
P0502
 Vehicle speed sensor low input
P0513*
 Immobilizer malfunction
P0551
 Power steering fluid pressure switch system
P0603
 EEPROM malfunction
P0604
 Random access memory (RAM) malfunction
P0605*
 Read only memory (FLASH ROM) malfunction
P0606*
 Engine-ECU (main CPU) malfunction
P0607*
 Engine-ECU (sub CPU) malfunction
P0628*
 Suction control valve open
P0629*
 Suction control valve battery short
P0630*
 Chassis number not programmed
P0638
 Throttle valve control servo stuck
P0642*
 Analog sensor reference voltage No. 1 too low
P0643*
 Analog sensor reference voltage No. 1 too high
P0652*
 Analog sensor reference voltage No. 2 too low
P0653*
 Analog sensor reference voltage No. 2 too high
P1203*
 Capacitor insufficient charging
P1204*
 Capacitor excessive charging
P1272*
 Pressure limiter malfunction
P1273*
 Supply pump insufficient flow
P1274*
 Supply pump protection
P1275*
 Supply pump exchange
P1276
 Fuel filter exchange
P1625*
 Injection quantity compensation valve error
P1626*
 Injection quantity compensation valve not coding
P2118
 Throttle valve control (DC motor) current 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
P2138*
 Accelerator pedal position sensor (main and sub) range/performance problem
P2146*
 Injector common 1 (cylinder No. 1 and No. 4) circuit open
P2147*
 Injector common circuit earth short
P2148*
 Injector common circuit battery short
P2149*
 Injector common 2 (cylinder No. 2 and No. 3) circuit open
P2228
 Barometric pressure sensor circuit low input
P2229
 Barometric pressure sensor circuit high input
P2413
 Exhaust gas recirculation system performance
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 "*" in the diagnosis code number column, the engine warning lamp illuminates only on the first detection of the malfunction.
  • When the fuel runs out, the engine warning lamp would illuminate possibly. Supplying the fuel turns off the engine warning lamp, but the diagnosis code Nos. P1272 and P1273 are stored.

METHOD OF READING AND ERASING DIAGNOSIS CODES
Refer to , GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.

DIAGNOSIS USING DIAGNOSIS 2 MODE
1.Switch the diagnosis mode of the engine control unit to DIAGNOSIS 2 mode using the M.U.T.-III.
2.Carry out a road test.
3.Take a reading of the diagnosis code and repair the problem location.
4.Turn the ignition switch to OFF and then back to ON again.
note By turning the ignition switch to OFF, the engine-ECU will switch the diagnosis mode from DIAGNOSIS 2 mode to DIAGNOSIS 1 mode.
5.Erase the diagnosis codes.

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 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.

DISPLAY ITEM LIST
Item No.
 Data
 Unit
2
 Ignition cycle
 -
4
 Accumulated minute
 min
note If malfunctions have been detected in multiple systems, store one malfunction only, which has been detected first.

FAIL-SAFE FUNCTION REFERENCE TABLE


When the diagnostic function detects a sensor or actuator fault or an abnormality in the control condition, the vehicle is controlled by means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning item
 Control contents during malfunction
Accelerator pedal position sensor
  • The accelerator pedal opening is controlled as 0%.
  • Idle rotations are 1,300 r/min (both main and sub are faulty or have a characteristic error).
Accelerator pedal position sensor (main)
 The amount of depression of the accelerator pedal is detected with using the accelerator pedal position sensor (sub) signal, which is calculated by taking half of the normal value.
Accelerator pedal position sensor (sub)
 The amount of depression of the accelerator pedal is detected with using the accelerator pedal position sensor (main) signal, which is calculated by taking half of the normal value.
Throttle position sensor
 Power to the throttle valve control servo is interrupted.
Crank angle sensor
 The engine is stopped (fuel injection and pump pressure feed are stopped).
Camshaft position sensor
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • The engine is stopped when a characteristic error of the crank angle sensor occurs (fuel injection and pump pressure feed are stopped).
Engine coolant temperature sensor
  • Engine coolant temperature is controlled as 80°C (-25°C at startup).
  • Exhaust gas recirculation control is stopped (fully closed).
Rail pressure sensor
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • The throttle valve is shut (opening fixed)
  • Exhaust gas recirculation control is stopped (fully closed).
Fuel temperature sensor
 Fuel temperature is controlled as 45°C (-25°C at startup).
Air flow sensor
  • Exhaust gas recirculation control is stopped (fully closed).
  • Control is performed using the previous value.
Manifold absolute pressure sensor
  • Manifold absolute pressure is controlled as 100 kPa.
  • Exhaust gas recirculation control is stopped (fully closed).
Barometric pressure sensor
  • Barometric pressure is controlled as 100 kPa.
  • Exhaust gas recirculation control is stopped (fully closed).
No. 1 intake air temperature sensor

  • Intake air temperature is controlled as 50°C.
  • Exhaust gas recirculation control is stopped (fully closed).
No. 2 intake air temperature sensor
  • Intake air temperature is controlled as 50°C.
  • Exhaust gas recirculation control is stopped (fully closed).
Exhaust gas recirculation valve position sensor
 Exhaust gas recirculation control is stopped (fully closed).
Injector
 Exhaust gas recirculation control is stopped (fully closed).
Suction control valve
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • The throttle valve is shut (opening fixed)
  • Exhaust gas recirculation control is stopped (fully closed).
Exhaust gas recirculation valve (DC motor)
 Exhaust gas recirculation control is stopped (fully closed).
Throttle valve control servo
 Power to the throttle valve control servo is interrupted.
Rail pressure too high
  • The throttle valve is shut (opening fixed)
  • The engine is stopped (fuel injection and pump pressure feed are stopped).
Fuel leak
 The engine is stopped (fuel injection and pump pressure feed are stopped).
Engine overrun
  • The throttle valve is shut (opening fixed)
  • The engine is stopped (fuel injection and pump pressure feed are stopped).
Boost pressure too high
  • Fuel injection is restricted (output restriction).
  • Exhaust gas recirculation control is stopped (fully closed).
Engine-ECU (RAM error)
 The engine is stopped (fuel injection and pump pressure feed are stopped).
Engine-ECU (sensor power error)
  • The accelerator pedal opening is controlled as 0%.
  • Idle rotations are 1,300 r/min.
Engine-ECU (flash ROM error, CPU error)
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • The throttle valve is shut (opening fixed)
  • Exhaust gas recirculation control is stopped (fully closed).
Engine-ECU (insufficient charging of capacitor for injector)
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • Exhaust gas recirculation control is stopped (fully closed).
Engine-ECU (excessive charging of capacitor for injector)
 The engine is stopped. (The fuel injection and pump delivery pressure are stopped).
Injector drive circuit error
 The engine is stopped. (The fuel injection and pump delivery pressure are stopped).
Pressure limiter open valve error
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • Exhaust gas recirculation control is stopped (fully closed).
Supply pump error
  • Rail pressure is controlled in the range from 50 to 60 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • A/C is cut. <Except the driving condition that the fuel pressure exceeds the seizure resistance>
  • The throttle valve is shut (fully closed). <Except the driving condition that the fuel pressure exceeds the seizure resistance>
  • Exhaust gas recirculation control is stopped (fully closed).
  • When the burn-in limit is exceeded, the engine is stopped gradually.
Injector correction data (Error data, unwritten)
  • Rail pressure is controlled in the range from 50 to 100 MPa.
  • Fuel injection is restricted (output restriction).
  • The open angle of the accelerator pedal is controlled.
  • Exhaust gas recirculation control is stopped (fully closed).