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Inspection Procedure
12: Hesitation, Sag, Poor Acceleration, Stumble or Surge
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COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed ignition system, improper air-fuel ratio,
improper compression pressure or other faults.
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PROBABLE CAUSE
- Failed air-fuel ratio control system
- Failed intake and exhaust system
- Failed emission control system
- Improper compression pressure
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| STEP 1. MUT-II/III diagnosis code Q: Diagnosis code set?
YES:
Inspection chart for diagnosis code (Refer to  ).
NO:
Go to Step 2  .
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| STEP 2. Check injector for operating sound. - Check injector for operating sound (Refer to ).
Q: Can operating sound be heard?
YES:
Go to Step 3 .
NO:
- Check the injector system of the defective
cylinder
- (Refer to code No. 41 injector system ).
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| STEP 3. MUT-II/III data list - Refer to Data list reference table .
- Item 13: Intake air temperature sensor
- Item 14: Throttle position sensor
- Item 21: Engine coolant temperature sensor
- Item 25: Barometric pressure sensor
Q: Are the check results normal?
YES:
Go to Step 4 .
NO:
Perform the diagnosis code classified check procedure for the sensor that has
shown an abnormal data value (Refer to Inspection Chart for Diagnosis Codes ).
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| STEP 4. Check EGR control solenoid valve itself. - Check EGR control solenoid valve itself [Refer to GROUP 17 -
Emission
Control System -
Exhaust Gas Recirculation (EGR) System ].
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Replace EGR control solenoid valve.
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| STEP 5. Check EGR valve itself. - Check EGR valve itself (Refer to GROUP 17 -
Emission Control System -
Exhaust
Gas Recirculation (EGR) System ).
Q: Is the check result normal?
YES:
Go to Step 6 <Vehicle without catalytic converter>.
NO:
Replace EGR valve.
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| STEP 6. Connector check: B-110 and B-111 ignition coil connectors |
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Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair.
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| STEP 7. Check ignition coil spark. Q: Is the check result normal?
YES:
Go to Step 12 .
NO:
Go to Step 11 .
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| STEP 8. Check spark plug. Q: Is the check result normal?
YES:
Go to Step 9 .
NO:
Replace spark plug.
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| STEP 9. Check spark plug cable itself. - Check spark plug cable itself (Refer to GROUP 16 -
Ignition System -
On-vehicle
Service ).
Q: Is the check result normal?
YES:
Go to Step 10 .
NO:
Replace spark plug cable.
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| STEP 10. Check ignition coil itself. - Check ignition coil itself (Refer to GROUP 16 -
Ignition System -
On-vehicle
Service ).
Q: Is the check result normal?
YES:
Go to Step 11 .
NO:
Replace ignition coil.
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| STEP 11. Check harness between terminal No. 2 of ignition coil connector
of each cylinder and body earth. |
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- Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES:
- Check and repair harness between terminal
No. 3 of ignition coil connector of each cylinder and C-112 engine-A/T-ECU
- Check signal line for open/short circuit and damage.
NO:
Repair.
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| STEP 12. Check throttle body (throttle valve portion) for contamination. Q: Is the check result normal?
YES:
Go to Step 13 .
NO:
Clean throttle body (throttle valve portion) (Refer to ).
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| STEP 13. Measure fuel pressure. - Measure fuel pressure (Refer to ).
Q: Is the check result normal?
YES:
Go to Step 14 .
NO:
Repair.
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| STEP 14. Check compression pressure. - Check compression pressure (Refer to GROUP 11A -
On-vehicle Service ).
Q: Is the check result normal?
YES:
Replace engine-A/T-ECU.
NO:
Repair.
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