ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF, L5]
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Input Signal System Inspection Procedure
1. Find an irregular signal. (See Finding irregular signals.)
2. Locate source. (See Locating the source of unusual signals.)
3. Repair or replace the malfunctioning part.
4. Confirm that the irregular signal is no longer detected.
Finding irregular signals
1. Start the engine and idle the vehicle. You can assume that any signals that are out of specification by a wide margin are irregular.
2. When recreating the problem, any sudden change in monitor input signals that is not intentionally created by the driver can be determined as irregular.
Locating the source of unusual signals
Variable resistance type 1 (TP sensor and EGR valve)
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Input signal system inspection for variable resistance type 1
1. When an irregular signal is detected, measure the #1 PCM terminal voltage.
2. Measure the #2 sensor terminal voltage.
Standard power supply system inspection for variable resistance type 1
GND system inspection for variable resistance type 1
Variable resistance type 2 (Mass air flow (MAF) sensor and VSS)
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GND system inspection for variable resistance type 2
Input signal system inspection for variable resistance type 2
1. When an irregular signal is detected, measure the #1 PCM terminal voltage.
2. Measure the #2 sensor terminal voltage.
Electrical supply system inspection for variable resistance type 2
Thermistor type (IAT sensor and ECT sensor)
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Input signal system inspection for thermistor type
1. When an irregular signal is detected, measure the #1 PCM terminal voltage.
2. Measure the #2 sensor terminal voltage.
GND system inspection for thermistor type
Main Relay Operation Inspection
1. Verify that the main relay clicks when the ignition to ON and off.
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.
Electronic Throttle Control System Inspection
Engine coolant temperature compensation inspection
1. Connect the M-MDS to the DLC-2.
2. Access the following PIDs:
3. Verify that the engine is cold, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
Load compensation inspection
1. Start the engine and idle it.
2. Connect the M-MDS to the DLC-2.
3. Verify that P0506:00 or P0507:00 is not displayed.
4. Access the RPM PID.
5. Verify that the engine speed is within the specification under each load condition.
Except for Israel
Israel
Throttle position (TP) sweep inspection
1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON.
3. Verify that none of the following DTC are displayed:
4. Access TP REL PID.
5. Verify that the PID reading is within the TP REL value. (See PCM INSPECTION [LF, L5].)
6. Gradually depress the throttle pedal and verify that the PID reading increases accordingly.
7. Fully depress the throttle pedal and verify that the PID reading is within WOT value. (See PCM INSPECTION [LF, L5].)
Variable Intake air Control Operation Inspection
1. Start the engine.
2. Inspect the rod operation under the following condition:
Rod operation
Engine speed
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4,600 rpm (LF), 4,300 rpm (L5)
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Below
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Above
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Shutter valve actuator
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Operate
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Not operate
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Brake override system operation inspection (From BL****-198281,BL1***-239890)
1. Start the engine and run it is idling.
2. Verify that the engine speed becomes approx. 1,200 rpm under the following conditions.
Variable Tumble Control Operation Inspection
1. Connect the M-MDS to the DLC-2.
2. Access ECT PID.
3. Verify that ECT PID is between 63 °C {145 °F} and 67 °C {153 °F}.
4. Start the engine.
5. Inspect rod operation under the following conditions:
Rod operation
Engine speed
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3,750 rpm
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Below
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Above
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Shutter valve actuator
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Operate
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Not operate
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Fuel Injector Operation Inspection
If simulation function of M-MDS is used:
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Start the engine and warm it up until normal operating temperature.
Connect the M-MDS to the DLC-2.
Select the INJ_1, INJ_2, INJ_3 and INJ_4 PIDs.
Turn the fuel injector from on to off using the M-MDS simulation function for each cylinder.
Does the engine speed drop?
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Yes
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Fuel injector operation is normal.
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No
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Go to the next step.
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2
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Disconnect the fuel injector connector that the engine speed does not drop at Step 1.
Switch the ignition to ON.
Measure the voltage between suspected fuel injector terminal B (wiring harness-side) and body ground.
Is the voltage B+?
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Yes
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Go to the next step.
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No
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Repair or replace for open or short circuit between fuel injector terminal B and main relay terminal C.
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3
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Inspect for open or short circuit between suspected fuel injector terminal A (wiring harness-side) and following PCM terminals:
• Fuel injector No.1 terminal A—PCM terminal 2BB
• Fuel injector No.2 terminal A—PCM terminal 2BC
• Fuel injector No.3 terminal A—PCM terminal 2BD
• Fuel injector No.4 terminal A—PCM terminal 2AZ
Is there any malfunction?
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Yes
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Repair or replace the wiring harness for a possible open or short circuit.
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No
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Go to the next step.
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4
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Inspect the suspected fuel injector.
Is there any malfunction?
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Yes
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Replace the suspected fuel injector.
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No
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Replace the PCM.
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If simulation function of M-MDS is not used:
STEP |
INSPECTION |
RESULTS |
ACTION |
---|---|---|---|
1
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While cranking the engine, inspect for fuel injector operation sound at each cylinder using a soundscope.
Is the operation sound heard?
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Yes
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Fuel injector operation is normal.
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No
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All cylinders not heard:
• Go to the next step.
Some cylinders not heard:
• Go to Step 3.
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2
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Perform the Main Relay Operation Inspection.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Inspect the following:
• Fuel injector power system related wiring harness and connectors
• PCM connectors
• Fuel injector GND and related wiring harness and connectors
Repair or replace the malfunctioning part according to the inspection results.
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3
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Switch the fuel injector connector of not operating fuel injector with operating fuel injector.
Is the operation sound heard?
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Yes
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Go to the next step.
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No
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Replace the suspected fuel injector.
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4
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Inspect the wiring harness and connectors of suspected fuel injector (Open or short).
• Fuel injector No.1 terminal A—PCM terminal 2BB
• Fuel injector No.2 terminal A—PCM terminal 2BC
• Fuel injector No.3 terminal A—PCM terminal 2BD
• Fuel injector No.4 terminal A—PCM terminal 2AZ
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Replace the PCM.
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Fuel Cut Control System Inspection
1. Warm up engine and idle it.
2. Turn off the electrical loads and A/C switch.
3. Connect the M-MDS to the DLC-2.
4. Access RPM PID.
5. Listen for the fuel injector operation sound at all cylinders using the soundscope and monitor both PIDs while performing the following steps:
Fuel Pump Operation Inspection
1. Remove the fuel-filler cap.
2. Switch the ignition to ON.
3. Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound is heard.
4. Measure voltage at wiring harness side fuel pump unit connector terminal B.
Fuel Pump Control System Inspection
1. Crank the engine and verify that fuel pump relay operation sound is heard.
2. If operation sound is not heard, inspect the following:
Spark Test
1. Disconnect the fuel pump relay.
2. Verify that each ignition coil and connector is connected properly.
3. Inspect the ignition system in the following procedure.
STEP |
INSPECTION |
ACTION |
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---|---|---|---|
1
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• Disconnect the ignition coil from the spark plugs.
• Remove the spark plugs.
• Verify that the spark plugs do not have carbon deposits.
• Are the spark plugs normal?
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Yes
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Go to the next step.
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No
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Perform no-load racing at 4,000 rpm for 2 min, 2 times to burn off the carbon deposits.
Repeat Step 1.
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2
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• Inspect the spark plugs for damage, wear, and proper plug gap.
• Is there any malfunction?
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Yes
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Replace the spark plugs, then go to Step 1.
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No
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Go to the next step.
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3
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• Reconnect the spark plugs to the ignition coil.
• Ground the spark plugs to the engine.
• Is a strong blue spark visible at each cylinder while cranking the engine?
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Yes
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Ignition system is normal.
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No
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Some cylinders do not spark:
• Go to the next step.
All cylinders do not spark:
• Go to Step 5.
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4
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• Inspect the open or short circuit in wiring harness between the following terminals (wiring harness-side):
• Are the wiring harnesses normal?
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Yes
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Inspect and replace the ignition coil.
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No
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 1.
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5
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• Measure the voltage at terminal A (wiring harness-side) in each ignition coils.
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Inspect the power supply circuit of ignition coils.
Repair or replace the malfunctioning part according to the inspection results.
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6
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• Does the PCM connector or ignition coil connectors have a poor connection?
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Yes
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Repair or replace the connector, then go to Step 1.
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No
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Go to the next step.
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7
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• Are the CKP sensor and crankshaft pulley normal?
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Yes
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Inspect for an open or short circuit in the wiring harness and connector of CKP sensor.
Repair or replace the malfunctioning part according to the inspection results.
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No
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 1.
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EGR Control System Inspection
1. Crank the engine and verify that EGR valve operation (initial operation) sound is heard.
2. Start the engine and idle it.
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs:
5. Idle the vehicle and verify that the SEGRP value is 0.
6. Put the vehicle in drive.
7. Depress the accelerator pedal and verify that the SEGRP DSD value is increased.
8. Stop the vehicle and verify that the SEGRP value returns to 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.
4. Warm up the engine to the normal operating temperature.
5. Stop the engine.
6. Connect the M-MDS to the DLC-2 and verify that the DTC P0443:00 is shown. Perform DTC inspection. (See DTC P0443:00 [LF, L5].)
7. Switch the ignition to ON.
8. Access ECT PID.
9. Verify that the engine coolant temperature is more than 78 °C {172 °F}.
10. Set the vehicle on the dynamometer or chassis roller.
11. Drive vehicle at engine speed approx. 2,000 rpm for 30 s or more.
12. Put a finger to the purge solenoid valve and verify that there is no vacuum applied while Step 2.
A/C Cut-off Control System Inspection
1. Start the engine.
2. Turn the A/C switch and the fan switch on.
3. Verify that the A/C compressor magnetic clutch actuates.
4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2—5 s.
Cooling Fan Control System Inspection
1. Verify that the battery voltage is above 12.4 V.
2. Connect the M-MDS to the DLC-2.
3. Access the following PIDs:
4. Turn the A/C switch to off.
5. Verify that the ECT PID is below 98 °C {209 °F} and the AC_REQ is off.
6. Switch the ignition to ON while the temperature is below 98 °C {209 °F} with the ignition is ON.
7. Verify that the cooling fan is not operating.
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}.
10. Turn the A/C switch to the off position.
11. Start the engine and idle it.
12. Verify that the cooling fan operating speed increases relative to the ECT PID increase.
Variable Valve Timing Control System Operation Inspection
When idling cannot be continued
1. Remove the OCV and verify that the spool valve is at maximum retard position.
2. Connect the OCV.
3. Switch the ignition to ON.
4. Verify that the spool valve is at maximum retard position.
5. Inspect the variable valve timing actuator. (See VARIABLE VALVE TIMING ACTUATOR INSPECTION [LF, L5].)
When idling can be continued
1. Disconnect OCV connector.
2. Warm up the engine and idle it.
3. Apply battery voltage to the OCV and verify that the engine idles roughly or stalls.
4. Remove the OCV and perform spool valve operation inspection. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [LF, L5].)
5. If they are normal, replace the camshaft pulley (with built-in variable valve timing actuator).