ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZ-CD 1.6 (Y6)]

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Guide Blade Actuator Operation Inspection

1.  Connect the M-MDS to the DLC-2.

2.  Perform the self-test and verify that the DTC P0045, P0246, P0047 and P0048 do not displayed.

•  Is the DTC P0045, P0246, P0047 or P0048 displayed, carry out appropriate DTC troubleshooting procedure.

3.  Start the engine and run it at idle.

4.  Simulate the VBCV PID duty value increase from 0% and verify that the guide blade actuator move.

•  If the guide blade actuator rod does not move inspect the following:
―  Vacuum tube connection
―  Guide blade actuator (stick or damaged)
―  VBC solenoid valve (stuck open or close).


Cooling Fan Motor Operation Inspection

1.  Verify that the battery voltage is 12.4 V or more.

•  If the battery voltage is 12.4 V or less, charge the battery or connect the external power supply.

2.  Connect the M-MDS to the DLC-2.

3.  Access the following PIDs.

•  ECT
•  AC_LOWSW
•  COLP

4.  Turn the A/C switch to OFF.

5.  Verify that ECT PID is 98 °C {209 °F} or less and the AC_REQ is off.

•  If the ECT PID is 98 °C {209 °F}, or less inspect the ECT sensor.
•  If the AC_REQ PID is on, inspect the A/C switch and A/C refrigerant pressure switch (high/low pressure).

6.  Turn the engine switch to the ON position while the temperature is 98 °C {209 °F} or less with the engine switch in the ON position.

7.  Verify that the cooling fan is not operating.

•  If the cooling fan is operating inspect the following:
(1)  Verify that the FAN DUTY PID is 0 %.
•  If the FAN DUTY PID is not 0 %, inspect the following PID and related parts.
―  ECT (ECT sensor)
―  AC_LOWSW (A/C switch and A/C refrigerant pressure switch (high/low) pressure)
―  COLP (A/C refrigerant pressure switch (medium pressure))
―  VSS (Vehicle speed sensor)
―  ACCS (A/C magnetic clutch)
•  If the FAN DUTY PID is 0 %, replace cooling fan component.

8.  Turn the A/C switch to ON.

9.  Verify that the cooling fan is operating while the ECT PID is below 98 °C {209 °F} or less.

•  If the cooling fan does not operate, inspect the following:
―  A/C switch
―  A/C refrigerant pressure switch
―  Fan control module power supply circuit (open or short circuit)
―  Fan control module ground circuit (open or short circuit)
―  Fan control module control signal circuit (open or short circuit between fan control module terminal 1C and PCM terminal 318)
―  Fan control module

10.  Verify that the cooling fan operates at medium speed while the COLP PID is off and at high speed while the COLP PID is on.

•  If the cooling fan does not operate at medium and/or high speed, inspect the following:
―  A/C refrigerant pressure switch (medium switch)
―  Fan control module

11.  Turn the A/C switch to OFF position.

12.  Start the engine and idle it.

13.  Verify that the cooling fan operating speed increases relative to the ECT PID increase.

•  If the cooling fan speed does not increase inspect the following:
―  ECT sensor (characteristic)
―  Fan control signal circuit (between fan control module terminal 1C and PCM terminal 318)
•  If the all items are normal, replace the cooling fan component.


Fuel Warmer System Operation Inspection

1.  Verify that the fuel warmer relay operation sound is heard when the engine switch is turned to the ON position.

•  If the operation sound is not heard, Inspect the following:
―  Wiring harness between the engine switch and fuel warmer relay (open circuit)
―  Wiring harness between the fuel warmer relay and ground (open circuit, short to power supply)
―  Fuel warmer relay (stuck on or off)

2.  Inspect the fuel warmer.

•  If the fuel warmer is not normal, replace the fuel warmer.
•  If the fuel warmer is normal, inspect and repair the following:
―  Wiring harness between the fuel warmer relay and fuel warmer terminal 1 (open circuit)
―  Wiring harness between the fuel warmer relay terminal 2 and ground (open circuit)
―  Fuel warmer connector (corrosion, damage and/or pulled-out pins)


Glow System Operation Inspection

1.  Connect the M-MDS to the DLC-2.

2.  Verify that DTCs are not displayed.

•  If any ETC sensor related DTC (P0117, P0118) is displayed, perform the appropriate DTC troubleshooting procedures.

3.  Disconnect the glow plug wire connector.

4.  Select the GPC PID and send ON.

5.  Verify that the glow plug relay operation sound is heard.

•  Wiring harness and connector between the battery positive post and glow plug relay terminal A
―  Open or short circuit in the wiring harness and connector between PCM terminal 210 and glow plug relay terminal C
―  Open or short circuit in the wiring harness and connector between PCM terminal 132 and glow plug relay terminal D
―  Glow plug relay

6.  Measure the voltage between the glow plug wire vehicle side connector and ground while the GPC PID is ON.

•  If the voltage is not B+ Inspect the following:
―  Open or short circuit in the wiring harness between glow plug relay terminal D and glow plug wire terminal A
―  Open or short circuit in the wiring harness between glow plug relay terminal D and glow plug wire terminal B
―  Open or short circuit in the wiring harness between glow plug relay terminal D and glow plug wire terminal C
―  Open or short circuit in the wiring harness between glow plug relay terminal D and glow plug wire terminal D
•  If the voltage is B+ Inspect the following:
―  Open or short circuit in the glow plug wire
―  Glow plugs


EGR System Operation Inspection

1.  Connect the M-MDS to the DLC-2.

2.  Verify that the DTC is not displayed.

3.  If any EGR system related DTC is displayed, perform the appropriate DTC troubleshooting procedures.

4.  Access the following PIDs:

•  ECT
•  EgrDc
•  RPM

5.  Warm up the engine to the normal operating temperature and run it at idle.

6.  Verify that the intake throttle and EGR valve when EgrDc PID is decrease (close) after the engine speed raised up above 3,000 rpm.

―  If it is not verified, perform the following procedures:
(1)  Turn the engine switch off.
(2)  Remove the EGR valve with the connector connected.
(3)  Turn the engine switch to the ON position.
(4)  Send the open and/or close command to the EGR valve using the EgrDc PID.
(5)  Verify that the EGR valve moves according to the command.
•  If the EGR valve does not move inspect the following:
―  EGR valve (stuck)
―  Open or short circuit in the wiring harness between PCM terminal 228 and EGR valve terminal C
―  Open or short circuit in the wiring harness between PCM terminal 227 and EGR valve terminal D
•  If the intake throttle valve moves, inspect the following:
―  EGR valve position sensor
―  Open or short circuit in the wiring harness between EGR valve terminal F and PCM terminal 201
―  Open or short circuit in the wiring harness between EGR valve terminal E and PCM terminal 129
―  Open or short circuit in the wiring harness between EGR valve terminal A and PCM terminal 121


Air Bypass Valve Operation Inspection (High Power-Euro 4)

1.  Remove the air bypass valve with the electrical connector connected

2.  Connect the M-MDS to DLC-2.

3.  Access the CABVP and CABVDC PIDs.

4.  Turn the engine switch to ON.

5.  Operate the air bypass valve using the simulation function of CABVP PID.

6.   Verify that the air bypass valve operation visually and the CABVDC PID are according to simulated air bypass valve position.

•  If the air bypass valve does not move according to simulated position, inspect the air bypass valve motor related wiring harnesses.
―  If the wirings are okay, replace the air bypass valve.
•  If the CABVDC PID value does not indicate according to simulated position, inspect the air bypass valve position senor related wiring harnesses.
―  If the wirings are okay, replace the air bypass valve.