ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3]

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition switch is turned to ON position and off.

• If there is no operation sound, inspect the following.

- Main relay (See RELAY INSPECTION.)

- Harness and connector between ignition switch and main relay terminal A.

- Harness and connector between PCM terminal 2X and main relay terminal E.

Intake Manifold Vacuum Inspection

1. Verify air intake hoses are installed properly.

2. Start the engine and run it at idle.

3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake manifold side.

4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum.

• If not as specified, inspect the following.

More than 60 kPa {450 mmHg, 18 inHg}

Note

• Air suction can be located by engine speed change when lubricant is sprayed on the area where suction is occurring.

- Air suction at throttle body, intake manifold and PCV valve installation points

- Accelerator cable free play

- Fuel injector insulator

- Engine compression

(See COMPRESSION INSPECTION [L3].)

Idle Air Control System Inspection

Engine coolant temperature compensation inspection

1. Connect WDS or equivalent to the DLC-2.

2. Select the following PIDs.

• ECT

• IAT

• RPM

3. Verify that the engine is in cold condition, then start the engine.

4. Verify that the engine speed decreases as the engine warms up.

• If the engine speed does not decrease or decreases slowly, inspect the following.

- ECT sensor and related harness

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3].)

- IAC valve and related harness

(See IDLE AIR CONTROL (IAC) VALVE INSPECTION [L3].)

Load compensation inspection

1. Start the engine and run is at idle.

2. Connect WDS or equivalent to the DLC-2.

3. Verify that P0506, P0507 or P0511 not displayed.

• If P0506, P0507 or P0511 shown, carry out DTC inspection.

(See DTC TABLE [L3].)

4. Change the duty value of the IAC valve to 100% using the IAC PID.

5. Verify that the idle speed increases.

• If the idle speed does not change, inspect the following.

- IAC valve air passage

- Open or short circuit between IAC valve connector terminals and PCM connector terminals 4G and 4J

6. Select the following PIDs.

• ACSW

• IAC

• PSP

• RPM

Note

• Excludes temporary idle speed drop just after the loads are turned on.

7. Verify that the engine speed is within the specification under each load condition.

• If not as specified specific load condition, inspect the following.

- A/C switch and related harness

- Fan switch and related harness

- PSP switch and related harness

(See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [L3].)

Engine speed

Load condition	Engine speed (rpm)*1
No load	600-700
E/L operating	600-700
A/C operating*2	650-750
P/S operating	650-750

^*1 : :

Excludes temporary idle speed drop just after the electrical loads are turned on.

^*2 : :

A/C switch and fan switch are on.

VIS Operation Inspection

1. Start the engine.

2. Inspect the rod operation under the following condition.

Rod operation

• If the rod operation is not as specified, inspect as follows.

(1) Stop the engine.

(2) Connect WDS or equivalent to the DLC-2.

(3) Verify that DTC P0661 or P0662 is not displayed.

• If DTC P0661 or P0662 is shown, carry out DTC inspection.

(See DTC TABLE [L3].)

(4) Turn ignition switch to ON.

(5) Turn the VIS control solenoid valve from on to off using the IVC PID and verify that operation sound of the solenoid valve is heard.

• If the operation sound is heard, inspect the following.

- Vacuum hose and vacuum chamber for looseness or damage

- Shutter valve actuator

(See VARIABLE INTAKE-AIR SYSTEM (VIS) SHUTTER VALVE ACTUATOR INSPECTION [L3].)

- Shutter valve stuck open or close

• If the operation sound is not heard, inspect the following.

- VIS control solenoid valve

(See VARIABLE INTAKE-AIR SYSTEM (VIS) SHUTTER VALVE ACTUATOR INSPECTION [L3].)

Variable Tumble Control System (VTCS) Operation Inspection

1. Connect the WDS or equivalent to the DLC-2.

2. Access ECT PID.

3. Verify that ECT PID is between 60°C {140°F} and 120°C {248°F}.

4. Start the engine.

5. Inspect rod operation under the following condition.

Rod operation

• If the rod operation is not specified, inspect as follows.

(1) Verify that DTC No. P2009 or P2010 is not displayed.

• If DTC No. P2009 or P2010 are shown, carry out DTC inspection.

(See DTC TABLE [L3].)

(2) Turn ignition switch to ON.

(3) Turn the VTCS solenoid valve from on to off using the IMRC PID and verify that operation sound of the solenoid valve is heard.

• If the operation sound is heard, inspect the following.

- Vacuum hose and vacuum chamber for looseness or damage

- Shutter valve actuator

(See VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SHUTTER VALVE ACTUATOR INSPECTION [L3].)

- Shutter valve stuck open or close

• If the operation sound is not heard, inspect the following.

- Variable tumble control solenoid valve

(See VARIABLE TUMBLE CONTROL SOLENOID VALVE INSPECTION [L3].)

Fuel Injector Operation Inspection

Fuel Cut Control System Inspection

1. Warm up engine and let it idle.

2. Turn off the electrical loads and A/C switch.

3. Connect WDS or equivalent to the DLC-2.

4. Select RPM and FUELPW1 PIDs.

5. Monitor both PIDs while performing the following steps.

(1) Depress the accelerator pedal and increase the engine speed to 4,000 rpm.

(2) Release the accelerator pedal (brake pedal is not depressed) and verify that the fuel injector duration time is 0 msec., and 2-5 msec. when the engine speed drops below 1,200 rpm.

• If not as specified, inspect the following.

- ECT sensor and related harness

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3].)

- Neutral/clutch switch and related harness (MTX)

(See CLUTCH SWITCH INSPECTION [L3].)

Fuel Pump Operation Inspection

1. Connect WDS or equivalent to the DLC-2.

2. Remove the fuel-filler cap.

3. Turn the ignition switch to ON position.

4. Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound is heard.

• If no operation sounds is heard, proceed to next step.

5. Measure the voltage at harness side fuel pump connector terminal B.

B+ (Ignition switch is on)

• If the voltage is as specified, inspect the following.

- Fuel pump continuity

- Fuel pump GND

- Wiring harness between fuel pump relay and PCM terminal 4P (without immobilizer system), 4Q (with immobilizer system)

• If not as specified, inspect the following.

- Fuel pump relay (See RELAY INSPECTION.)

- Wiring harness and connector (Main relay-fuel pump relay-fuel pump)

Fuel Pump Control System Inspection

1. Connect WDS or equivalent to the DLC-2.

2. Turn the ignition switch to ON position.

3. Select FP PID.

4. Turn the fuel pump relay from off to on and inspect if the operation sound of the fuel pump relay is heard.

• If no operation sound is heard, inspect the fuel pump relay.

• If the fuel pump relay is normal, inspect the following.

- Wiring harnesses and connectors (Main relay-fuel pump relay-PCM)

Spark Test

1. Remove the fuel pump relay.

2. Verify that each high-tension lead and connector is connected properly.

3. Inspect the ignition system in the following procedure.

Warning

• High voltage in the ignition system can cause strong electrical shock which can result in serious injury. Avoid direct contact to the vehicle body during the following spark test.

EGR Control System Inspection

1. Verify that EGR valve operation (initial operation) sound is heard when the ignition switch is turned to ON position.

• If the operation sound is not heard, connect WDS or equivalent to the DLC-2 and verify that the DTC P0403 is shown. Carry out DTC inspection. (See DTC TABLE [L3].)

2. Start the engine and run it at idle.

3. Increase the step value of EGR valve from 0 to 40 using SEGRP PID.

4. Operate the EGR valve and inspect if the engine speed becomes unstable or the engine stalls.

• If the engine speed will not change, proceed to following.

(1) Stop the engine.

(2) Remove the EGR valve.

(3) Connect the EGR valve connector.

(4) Turn the ignition switch to ON.

(5) Increase the step value of EGR valve from 0 to 40 using SEGRP PID.

(6) Inspect the EGR operation.

• If the EGR valve is operated, clean the EGR valve and reinspect from Step 2.

• If the EGR valve will not operate, replace the EGR valve and reinspect from Step 2.

5. Warm up the engine to normal operating temperature.

6. Select the following PIDs.

• ECT

• RPM

• SEGRP

• TP

• VSS

7. Let the vehicle idle and verify that the SEGRP value is 0.

8. Put the vehicle in drive.

9. Depress the accelerator pedal and verify that the SEGRP value is increased.

• If the SEGRP value will not increase, inspect the VSS, TP and ECT PIDs. (See PCM INSPECTION [L3].)

10. Stop the vehicle and verify that the SEGRP value is returned 0.

Purge Control System Inspection

1. Start the engine.

2. Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.

3. Put a finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold.

• If there is a vacuum, inspect the following.

- Wiring harness and connectors (Purge solenoid valve-PCM terminal 4U)

- Purge solenoid valve

4. Warm up the engine to the normal operating temperature.

5. Stop the engine.

6. Connect WDS or equivalent to the DLC-2 and verify that the DTC P0443 is shown. Carry out DTC inspection. (See DTC TABLE [L3].)

7. Turn the ignition switch to ON position.

8. Select ECT PID.

9. Verify that the engine coolant temperature is above 60°C {140°F}.

• If WDS or equivalent indicates below 60°C {140°F}, carry out the ECT sensor inspection.

10. Select EVAPCP PID.

11. Increase the duty value of the purge solenoid valve to 50% and inspect if the operation sound of the valve is heard.

• If the operation sound is heard, inspect for the loose or damaged vacuum hose. (Intake manifold-purge solenoid valve-charcoal canister)

• If the operation sound is not heard, carry out the purge solenoid valve inspection.

A/C Cut-off Control System Inspection

1. Start the engine.

2. Turn the A/C switch and fan switch on.

3. Verify that the A/C compressor magnetic clutch actuates.

• If it does not actuate, go to symptom troubleshooting "No.23 A/C does not work sufficiently".

4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2-5 seconds.

• If it actuates, inspect as follows.

(1) Connect WDS or equivalent to the DLC-2.

(2) Turn the A/C switch off.

(3) Turn the ignition switch to ON position.

(4) Select ACCS PID.

(5) Turn the A/C relay from off to on and inspect if the operation sound of the relay is heard.

• If the operation sound is heard, inspect TP PID.

• If the operation sound is not heard, inspect following.

- A/C relay

- Open or short to GND circuit in wiring harness and connectors (Ignition switch-A/C relay-PCM terminal 4O)

- A/C related parts

Cooling Fan Motors Operation Inspection

1. Cool down engine.

2. Connect the WDS or equivalent to the DLC-2.

3. Turn ignition switch on position.

4. Turn A/C switch off position

5. Verify that cooling fans are not operated.

• If cooling fans are operated, Select FAN DUTY PID by using data monitor function and verify FAN DUTY PID value is 0%.

- If FAN DUTY PID value is not 0%, inspect ECT (voltage) and ACSW PID.

- If FAN DUTY PID value is 0%, inspect the fan control module and related harnesses.

6. Increase FAN DUTY PID value from 0% to 100% gradually by using data monitor and simulation function.

7. Verify that both cooling fans operation speed increase in accordance with FAN DUTY PID value changes.

Note

• Cooling fans are not rotate when FAN DUTY PID value is lower than 30% by fan motor internal friction.

• If there is a problem, inspect follows.

(1) Verify clicking sound of cooling fan relay when turn ignition switch off to on position.

• If there is no clicking sound, inspect cooling fan relay and open circuit between main relay and cooling fan relay.

• If clicking sound was heard, inspect next step.

(2) Inspect following parts in order in accordance with fan operation conditions.

• Open circuit between fan control module and cooling fan relay

• Open circuit between fan control module and GND

• Poor connection of fan control module connector.

• Fan control module malfunction

• Open or short to ground circuit between fan control module and cooling fan motor No.1

• Poor connection of fan control module connector or cooling fan motor No.1 connector

• Cooling fan motor No.1 malfunction

• Fan control unit malfunction

• Open or short to ground circuit between fan control module and cooling fan motor No.2

• Poor connection of fan control module connector or cooling fan motor No.2 connector

• Cooling fan motor No.2 malfunction

• Fan control module malfunction