DESCRIPTION
Problem Symptom | Suspected Area | Trouble Area | |
---|---|---|---|
Strong engine vibration due to above symptoms |
| Ignition system |
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Fuel system |
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Intake and exhaust systems |
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Other control systems |
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Engine |
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High load from another system |
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HINT:
SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION
HINT:
The following are descriptions of the characteristics of each system malfunction. After understanding the link between the causes and symptoms, perform the inspection of each component. Even if the problem symptom does not recur, signs of the malfunction may be found in the Data List.
(a) Ignition system
Spark plug Main cause of malfunction | Performance degradation (wear, existence of foreign matter, etc.) |
Symptom | Engine speed fluctuation due to abnormal combustion |
Data List | Misfire Count Cylinder #1 to #6 |
HINT: If the spark plug of the malfunctioning cylinder is abnormally wet with fuel, a leaking fuel injector assembly is suspected. |
Main cause of malfunction | Internal malfunction |
Problem symptom | Engine speed fluctuation due to abnormal combustion |
Data List | Misfire Count Cylinder #1 to #6 |
(b) Fuel system
Fuel injector assembly Main cause of malfunction | Blockage |
Problem symptom |
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Data List |
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HINT: If the engine malfunction disappears when the fuel injection volume is increased or decreased using the Control the Injection Volume, the respective cylinder may be malfunctioning. |
HINT: If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel pump or fuel filter is suspected. |
Main cause of malfunction |
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Problem symptom |
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(c) Intake and exhaust systems
Mass air flow meter sub-assembly Main cause of malfunction | Performance degradation (existence of foreign matter, etc.) |
Problem symptom | Lack of power |
Data List | Mass Air Flow Sensor |
HINT: If the value of the Data List item "Mass Air Flow Sensor" is abnormal, a malfunction of the mass air flow meter sub-assembly is suspected. |
Main cause of malfunction | Inappropriate trim volume adjustment due to accumulation of deposits |
Problem symptom |
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Data List |
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Main cause of malfunction | Deviation in sensor characteristics |
Problem symptom | Abnormal combustion due to deviation of actual air fuel ratio from calculated ratio |
Data List |
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(d) Engine
Engine assembly Main cause of malfunction |
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Problem symptom |
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HINT:
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Data List Items Related to Lack of Power
HINT:
Depending on the vehicle model, the applicable Data List items may vary. Data List items other than the ones used in the diagnostic procedure are for reference only.
PROCEDURE
1. | INTERVIEW THE CUSTOMER |
(a) Interview the customer for details about the conditions when experiencing the lack of power.
HINT:
If a lack of power occurs when the engine is running under a high load and at a high engine speed, the fuel filter may be clogged.
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2. | CHECK DTC OUTPUT |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Perform a road test.
(e) Enter the following menus: Powertrain / Engine / Trouble Codes.
(f) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
DTCs are not output | A |
DTC is output (DTCs other than P160300, P160400 or P160500 are output) | B |
B | GO TO DTC CHART |
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3. | SYMPTOM CONFIRMATION |
(a) Check if the problem symptoms reported in the customer problem analysis recur.
HINT:
If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.
Result | Proceed to |
---|---|
The problem symptom recurs | A |
The problem symptom does not recur (occurred in the past) | B |
B | CHECK FOR INTERMITTENT PROBLEMS |
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4. | READ VALUE USING TECHSTREAM (ISC F/B LEARN TORQUE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / ISC F/B Learn Torque.
Powertrain > Engine > Data List Tester Display |
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ISC F/B Learn Torque |
(e) Read the value displayed on the Techstream.
Result | Proceed to |
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Less than 30 Nm | A |
Other than above | B |
B | GO TO STEP 12 |
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5. | READ VALUE USING TECHSTREAM (KNOCK CORRECT LEARN VALUE) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
(c) Turn the Techstream on.
(d) Idle the engine.
(e) Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature and Knock Correct Learn Value.
Powertrain > Engine > Data List Tester Display |
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Knock Correct Learn Value |
Coolant Temperature |
(f) Read the value.
Knock Correct Learn Value | Proceed to |
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5 deg(CA) or higher | A |
Less than 5 deg(CA) | B |
HINT:
B | CONFIRM FUEL |
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6. | READ VALUE USING TECHSTREAM (SHORT FT B1S1 (B2S1) AND LONG FT B1S1 (B2S1)) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Short FT B1S1, Short FT B2S1, Long FT B1S1 and Long FT B2S1.
Powertrain > Engine > Data List Tester Display |
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Short FT B1S1 |
Short FT B2S1 |
Long FT B1S1 |
Long FT B2S1 |
(e) Read the value displayed on the Techstream.
Data List | Result | Proceed to |
---|---|---|
Short FT B1S1 (B2S1) + Long FT B1S1 (B2S1) | -15% or higher, or less than 15% | A |
Other than above | B |
HINT:
B | GO TO STEP 16 |
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7. | PERFORM ACTIVE TEST USING TECHSTREAM (D-4S (FUEL CUT)) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
HINT:
Reproduce the vehicle conditions when the malfunction occurred. (such as after the engine is warmed up or after a cold start).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Active Test / D-4S (Fuel Cut) / Data List / Engine Speed.
Powertrain > Engine > Active Test Active Test Display |
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D-4S (Fuel Cut) |
Data List Display |
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Engine Speed |
(e) According to the display on the Techstream, perform the Active Test and check for a malfunctioning cylinder.
HINT:
Result | Proceed to |
---|---|
One cylinder is malfunctioning | A |
Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined. | B |
B | GO TO STEP 16 |
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8. | PERFORM ACTIVE TEST USING TECHSTREAM (CHECK THE CYLINDER COMPRESSION) |
HINT:
If the vehicle does not support the Active Test "Check the Cylinder Compression", measure the compression pressure. If the compression pressure is normal, go to step 9 (PERFORM ACTIVE TEST USING TECHSTREAM (D-4S (INJECTION VOLUME))).
(a) Warm up the engine.
(b) Turn the engine switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the engine switch on (IG).
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed Cylinder #1 to #6 and Average Engine Speed of All Cylinder.
Powertrain > Engine > Active Test Active Test Display |
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Check the Cylinder Compression |
Data List Display |
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Engine Speed Cylinder #1 |
Engine Speed Cylinder #2 |
Engine Speed Cylinder #3 |
Engine Speed Cylinder #4 |
Engine Speed Cylinder #5 |
Engine Speed Cylinder #6 |
Average Engine Speed of All Cylinder |
HINT:
To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.
(g) Push the snapshot button to turn the snapshot function on.
HINT:
Using the snapshot function, data can be recorded during the Active Test.
(h) While the engine is not running, press the Active button to change Check the Cylinder Compression to "Start".
HINT:
After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.
(i) Crank the engine for about 10 seconds.
(j) Monitor the engine speed (Engine Speed Cylinder #1 to #6 and Average Engine Speed of All Cylinder) displayed on the Techstream.
HINT:
NOTICE:
(k) Stop cranking the engine, and then change "Check the Cylinder Compression" to "Stop" after the engine stops.
NOTICE:
(l) Push the snapshot button to turn the snapshot function off.
(m) Select "Stored Data" on the Techstream screen, select the recorded data and display the data as a graph.
HINT:
If the data is not displayed as a graph, the change of the values cannot be observed.
(n) Read the value.
HINT:
Result | Proceed to |
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There is no variation in "Engine Speed Cylinder" (All cylinders display approximately the same value for "Engine Speed Cylinder") | A |
There is variation in "Engine Speed Cylinder" (Only one cylinder displays a value for "Engine Speed Cylinder" that differs considerably) | B |
B | GO TO STEP 14 |
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9. | PERFORM ACTIVE TEST USING TECHSTREAM (D-4S (INJECTION VOLUME)) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(e) Idle the engine.
(f) Enter the following menus: Powertrain / Engine / Active Test / D-4S (Injection Volume) / Data List / Coolant Temperature.
Powertrain > Engine > Active Test Active Test Display |
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D-4S (Injection Volume) |
Data List Display |
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Coolant Temperature |
(g) According to the display on the Techstream, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume of port injection and direct injection.
HINT:
Result | Proceed to |
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Malfunction is still present even if the fuel injection volume is changed | A |
Malfunction disappears when the fuel injection volume is changed | B |
B | GO TO STEP 15 |
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10. | CHECK IGNITION SYSTEM |
(a) Check the ignition system.
HINT:
Result | Proceed to |
---|---|
The malfunctioning cylinder does not return to normal | A |
The malfunctioning cylinder returned to normal | B |
B | GO TO STEP 27 |
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11. | INSPECT OTHER RELATED COMPONENTS |
(a) Check the power source circuit, wire harness and connectors.
NEXT | GO TO STEP 27 |
12. | REMOVE FOREIGN OBJECT (CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY) |
(a) Clean off any deposits from the inside of the throttle body with motor assembly.
(b) Push open the throttle valve and wipe off any carbon from the valve and bore using a piece of cloth soaked in non-residue solvent.
*1 | Throttle Body with Motor Assembly | *2 | Bore |
*3 | Valve | - | - |
*a | Reference | *b | Throttle Body with Motor Assembly Cross-section Diagram |
*c | When valve fully opened | *d | Do not directly apply cleaner |
*e | Deposits | - | - |
NOTICE:
HINT:
The illustrations are for reference only. Actual parts may differ.
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13. | PERFORM CONFIRMATION DRIVING PATTERN |
(a) Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.
Click here
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
(f) Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.
HINT:
If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body with motor assembly, the idle speed may increase.
NEXT | GO TO STEP 28 |
14. | CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary.
Click here
NEXT | GO TO STEP 27 |
15. | REPLACE FUEL INJECTOR ASSEMBLY |
(a) Replace the abnormal fuel injector assembly.
HINT:
Click here
NEXT | GO TO STEP 28 |
16. | READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(e) Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor and Coolant Temperature.
Powertrain > Engine > Data List Tester Display |
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Mass Air Flow Sensor |
Coolant Temperature |
(f) According to the display on the Techstream, read the Data List when the engine is running.
Result | Proceed to |
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Idling (without load): 2.6 to 3.7 gm/sec Engine speed 2000 rpm (without load): 5.4 to 9.6 gm/sec Engine speed 3000 rpm (without load): 10.6 to 15.8 gm/sec | A |
Other than above | B |
B | GO TO STEP 20 |
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17. | PERFORM ACTIVE TEST USING TECHSTREAM (D-4S (INJECTION VOLUME)) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(e) Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.
(f) Idle the engine.
(g) Enter the following menus: Powertrain / Engine / Active Test / D-4S (Injection Volume) / Data List / Coolant Temperature, A/F (O2) Sensor Voltage B1S1, A/F (O2) Sensor Voltage B2S1, O2 Sensor Voltage B1S2 and O2 Sensor Voltage B2S2.
Powertrain > Engine > Active Test Active Test Display |
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D-4S (Injection Volume) |
Data List Display |
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Coolant Temperature |
A/F (O2) Sensor Voltage B1S1 |
A/F (O2) Sensor Voltage B2S1 |
O2 Sensor Voltage B1S2 |
O2 Sensor Voltage B2S2 |
(h) According to the display on the Techstream, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume of port injection and direct injection.
NOTICE:
HINT:
Standard:
Techstream Display (Sensor) | Injection Volume | Voltage |
---|---|---|
A/F (O2) Sensor Voltage B1S1 A/F (O2) Sensor Voltage B2S1 (Air fuel ratio) | 24.8% | Below 3.1 V |
-12.5% | Higher than 3.4 V | |
O2 Sensor Voltage B1S2 O2 Sensor Voltage B2S2 (Heated oxygen) | 24.8% | Higher than 0.55 V |
-12.5% | Below 0.4 V |
Result | Proceed to |
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Output voltage values are abnormal | A |
Malfunction disappears when fuel injection volume is increased | B |
Malfunction is still present when fuel injection volume is increased, even if output voltage values are normal | C |
B | GO TO STEP 19 |
C | GO TO STEP 21 |
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18. | REPLACE AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR |
(a) Replace the air fuel ratio sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor.
Click here
(b) Replace the heated oxygen sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the heated oxygen sensor.
Click here
NEXT | GO TO STEP 28 |
19. | REPLACE FUEL INJECTOR ASSEMBLY |
(a) Replace the fuel injector assemblies of all cylinders.
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
NEXT | GO TO STEP 28 |
20. | CHECK INTAKE SYSTEM |
(a) Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.
HINT:
NEXT | GO TO STEP 27 |
21. | PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE CIRCUIT RELAY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.
Powertrain > Engine > Active Test Tester Display |
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Activate the Circuit Relay |
(e) When performing the Active Test, check for an operating sound from the fuel pump (for low pressure side).
OK:
Activate the Circuit Relay | Specified Condition |
---|---|
ON | Operating sound heard |
OFF | Operating sound not heard |
NG | GO TO STEP 26 |
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22. | INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE) |
(a) Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine.
Click here
Standard:
Vehicle State | Specified Condition |
---|---|
Cranking engine | 196 to 833 kPa (2.0 to 8.5 kgf/cm2, 28 to 121 psi) |
5 minutes after stopping engine | 98 kPa (1.0 kgf/cm2, 14 psi) or higher |
HINT:
NG | GO TO STEP 25 |
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23. | READ VALUE USING TECHSTREAM (FUEL PRESSURE (HIGH)) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine and warm it up.
(e) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temperature, Fuel Pressure (High) and Injection Mode.
Powertrain > Engine > Data List Tester Display |
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Engine Speed |
Coolant Temperature |
Fuel Pressure (High) |
Injection Mode |
(f) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(g) According to the display on the Techstream, read the Data List.
Standard:
Techstream Display | Condition | Specified Condition |
---|---|---|
Fuel Pressure (High) |
| 2400 to 20000 kPag |
NG | GO TO STEP 27 |
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24. | INSPECT OTHER RELATED COMPONENTS |
(a) Inspect other related components.
HINT:
If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.
NEXT | GO TO STEP 27 |
25. | INSPECT RELATED PARTS |
(a) Inspect the following fuel pump related parts:
NEXT | GO TO STEP 27 |
26. | INSPECT FUEL PUMP CONTROL SYSTEM |
(a) Inspect the fuel pump control system.
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27. | REPAIR OR REPLACE MALFUNCTIONING PARTS |
(a) Repair or replace the malfunctioning part.
(b) Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.
Click here
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28. | CONDUCT CONFIRMATION TEST |
(a) Check that the engine has returned to normal.
NEXT | END |