Ecd System - How To Proceed With Troubleshooting

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM


ECD SYSTEM - HOW TO PROCEED WITH TROUBLESHOOTING

  • HINT:
Use the following procedures to troubleshoot the ECD system.
The intelligent tester should be used in steps 3, 4, 5, 7, and 9.

1.VEHICLE BROUGHT TO WORKSHOP
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2.CUSTOMER PROBLEM ANALYSIS
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3.CONNECT INTELLIGENT TESTER TO DLC3
  • HINT:
  • If the display indicates a communication error with the tester, inspect the DLC3.
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4.CHECK DTC AND FREEZE FRAME DATA
  • HINT:
  • Record or print DTCs and freeze frame data if necessary.
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5.CLEAR DTC AND FREEZE FRAME DATA
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6.CONDUCT VISUAL INSPECTION
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7.SET CHECK MODE DIAGNOSIS
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8.CONFIRM PROBLEM SYMPTOMS
  • HINT:
  • If the engine does not start, perform steps 10 and 12 first.
  • Result:
  • ResultProceed to
    Malfunction occursA
    Malfunction does not occurB
B.
SIMULATE SYMPTOMS
A
9.CHECK DTC
  • Result:
  • ResultProceed to
    Trouble codeA
    No trouble codeB
B.
Go to step 11
A
10.REFER TO DTC CHART
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Go to step 14
11.CONDUCT BASIC INSPECTION
  • Result:
  • ResultProceed to
    Malfunctioning parts not confirmedA
    Malfunctioning parts confirmedB
B.
Go to step 16
A
12.REFER TO PROBLEM SYMPTOMS TABLE
  • HINT:
Engine difficult to start or stalling .
Black smoke emitted .
Rough idling or excessive engine vibration .
Engine knocking or rattling .
Lack of power or hesitation .
  • Result:
  • ResultProceed to
    Malfunctioning circuit confirmedA
    Malfunctioning parts confirmedB
B.
Go to step 16
A
13.CHECK ECM POWER SOURCE CIRCUIT
NEXT
14.CONDUCT CIRCUIT INSPECTION
  • Result:
  • ResultProceed to
    Malfunction not confirmedA
    Malfunction confirmedB
B.
Go to step 17
A
15.CHECK FOR INTERMITTENT PROBLEMS
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Go to step 17
16.CONDUCT PARTS INSPECTION
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17.IDENTIFY PROBLEM
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18.ADJUST AND/OR REPAIR OR REPLACE
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19.CONDUCT CONFIRMATION TEST
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END