ECD SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips

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

VEHICLE BROUGHT TO WORKSHOP

NEXT
CUSTOMER PROBLEM ANALYSIS

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CONNECT INTELLIGENT TESTER TO DLC3

Tech Tips

If the display indicates a communication error with the tester, inspect the DLC3.

NEXT
CHECK DTC AND FREEZE FRAME DATA

Tech Tips

Record or print DTCs and freeze frame data if necessary.

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CLEAR DTC AND FREEZE FRAME DATA

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CONDUCT VISUAL INSPECTION

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SET CHECK MODE DIAGNOSIS

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CONFIRM PROBLEM SYMPTOMS

Tech Tips

If the engine does not start, perform steps 10 and 12 first.

Result

Result	Proceed to
Malfunction occurs	A
Malfunction does not occur	B

B

SIMULATE SYMPTOMS

A

CHECK FOR DTC

Result

Result	Proceed to
Trouble code	A
No trouble code	B

B

Go to step 11

A

REFER TO DTC CHART

NEXT

Go to step 14

CONDUCT BASIC INSPECTION

Result

Result	Proceed to
Malfunctioning parts not confirmed	A
Malfunctioning parts confirmed	B

B

Go to step 16

A

REFER TO PROBLEM SYMPTOMS TABLE

Tech Tips

Engine difficult to start or stalling Click here.
Black smoke emitted Click here.
Rough idling or excessive engine vibration Click here.
Engine knocking or rattling Click here.
Lack of power or hesitation Click here.

Result

Result	Proceed to
Malfunctioning circuit confirmed	A
Malfunctioning parts confirmed	B

B

Go to step 16

A

CHECK ECM POWER SOURCE CIRCUIT

NEXT

CONDUCT CIRCUIT INSPECTION

Result

Result	Proceed to
Malfunction not confirmed	A
Malfunction confirmed	B

B

Go to step 17

A

CHECK FOR INTERMITTENT PROBLEMS

NEXT

Go to step 17
CONDUCT PARTS INSPECTION

NEXT
IDENTIFY PROBLEM

NEXT
ADJUST AND/OR REPAIR OR REPLACE

NEXT
CONDUCT CONFIRMATION TEST

NEXT

END