Ch13

OBJECTIVES ,[object Object],[object Object],[object Object],[object Object],[object Object],(Continued)

[object Object],[object Object]

ON-BOARD DIAGNOSTICS GENERATION-II (OBD-II) SYSTEMS ,[object Object],(Continued)

[object Object],[object Object],[object Object],(Continued)

[object Object],[object Object],(Continued)

Figure 13-1 A typical malfunction indicator lamp (MIL), often labeled “check engine.”

OBD-II Objectives ,[object Object],(Continued)

[object Object],[object Object],[object Object],[object Object],(Continued)

MONITORS ,[object Object],(Continued)

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(Continued)

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(Continued)

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(Continued)

DIAGNOSTIC TROUBLE CODE PRIORITY ,[object Object],[object Object],[object Object],[object Object],(Continued)

ENABLING CRITERIA ,[object Object],(Continued)

OBD-II DRIVE CYCLE ,[object Object],(Continued)

[object Object],[object Object],[object Object],[object Object],[object Object],(Continued)

OBD-II DTC NUMBERING DESIGNATION ,[object Object],(Continued)

Figure 13-2 Sixteen-pin OBD-II DLC with terminals identified. Scan tools use the power pin (16) and ground pin (4) for power so that a separate cigarette lighter plug is not necessary on OBD-II vehicles.

Figure 13-3 OBD-II DTC identification format.

SHORT-TERM FUEL TRIM ,[object Object],[object Object],(Continued)

Figure 13-4 Both short-term fuel trim and long-term fuel trim use a percentage (%) of adding or subtracting fuel from normal values based on oxygen sensor activity. Many General Motors vehicles display counts instead of percentages. This chart plots both together so that a comparison can be made.

LONG-TERM FUEL TRIM ,[object Object]

USING FUEL TRIM AS A DIAGNOSTIC AID ,[object Object],(Continued)

FUEL TRIM CELLS ,[object Object]

FUEL TRIM CELL DIAGNOSIS ,[object Object],(Continued)

FUEL TRIM AND MISFIRE CODES ,[object Object],[object Object],(Continued)

GENERIC OBD II ,[object Object],[object Object],[object Object],[object Object],(Continued)

DIAGNOSING PROBLEMS USING MODE SIX ,[object Object],[object Object],[object Object],(Continued)

Ch13

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Ch13