31603 - Innova Pro

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Onboard DiagnosticsDIAGNOSTIC TROUBLE CODES (DTCs)DTCs and MIL StatusWhen the vehicle’s on-board computer detectsa failure in an emissions-related component orsystem, the computer’s internal diagnosticprogram assigns a diagnostic trouble code(DTC) that points to the system (and subsystem)where the fault was found. The diagnosticprogram saves the code in the computer’smemory. It records a “Freeze Frame” ofconditions present when the fault was found, and lights the MalfunctionIndicator Lamp (MIL). Some faults require detection for two trips in a rowbefore the MIL is turned on.The “Malfunction Indicator Lamp” (MIL) is the accepted termused to describe the lamp on the dashboard that lights to warnthe driver that an emissions-related fault has been found.Some manufacturers may still call this lamp a “Check Engine”or “Service Engine Soon” light.There are two types of DTCs used for emissions-related faults: Type “A”and Type “B.” Type “A” codes are “One-Trip” codes; Type “B” DTCs areusually Two-Trip DTCs.When a Type “A” DTC is found on the First Trip, the following eventstake place:• The computer commands the MIL “On” when the failure is first found.• If the failure causes a severe misfire that may cause damage to thecatalytic converter, the MIL “flashes” once per second. The MILcontinues to flash as long as the condition exists. If the conditionthat caused the MIL to flash is no longer present, the MIL will light“steady” On.• A DTC is saved in the computer’s memory for later retrieval.• A “Freeze Frame” of the conditions present in the engine or emissionssystem when the MIL was ordered “On” is saved in the computer’smemory for later retrieval. This information shows fuel system status(closed loop or open loop), engine load, coolant temperature, fuel trimvalue, MAP vacuum, engine RPM and DTC priority.When a Type “B” DTC is found on the First Trip, the following eventstake place:• The computer sets a Pending DTC, but the MIL is not ordered “On.”“Freeze Frame” data may or may not be saved at this timedepending on manufacturer. The Pending DTC is saved in thecomputer’s memory for later retrieval.• If the failure is found on the second consecutive trip, the MIL isordered “On.” “Freeze Frame” data is saved in the computer’smemory.• If the failure is not found on the second Trip, the Pending DTC iserased from the computer’s memory.The MIL will stay lit for both Type “A” and Type “B” codes until one ofthe following conditions occurs:18 CarScan+ ABS/SRS
Onboard DiagnosticsOBD2 MONITORS• If the conditions that caused the MIL to light are no longer presentfor the next three trips in a row, the computer automatically turns theMIL “Off” if no other emissions-related faults are present. However,the DTCs remain in the computer’s memory as a history code for 40warm-up cycles (80 warm-up cycles for fuel and misfire faults). TheDTCs are automatically erased if the fault that caused them to beset is not detected again during that period.• Misfire and fuel system faults require three trips with “similarconditions” before the MIL is turned “Off.” These are trips where theengine load, RPM and temperature are similar to the conditionspresent when the fault was first found.After the MIL has been turned off, DTCs and Freeze Framedata stay in the computer’s memory.• Erasing the DTCs from the computer’s memory can also turn off theMIL. See ERASING DIAGNOSTIC TROUBLE CODES (DTCs) onpage 53, before erasing codes from the computer’s memory. If aDiagnostic Tool or Scan Tool is used to erase the codes, FreezeFrame data will also be erased.OBD2 MONITORSTo ensure the correct operation of the various emissions-relatedcomponents and systems, a diagnostic program was developed andinstalled in the vehicle’s on-board computer. The program has severalprocedures and diagnostic strategies. Each procedure or diagnosticstrategy is made to monitor the operation of, and run diagnostic tests on,a specific emissions-related component or system. These tests ensurethe system is running correctly and is within the manufacturer’sspecifications. On OBD2 systems, these procedures and diagnosticstrategies are called “Monitors.”Currently, fifteen Monitors are supported by OBD2 systems. Additionalmonitors may be added as a result of Government regulations as theOBD2 system grows and matures. Not all vehicles support all fifteenMonitors. Additionally, some Monitors are supported by “spark ignition”vehicles only, while others are supported by “compression ignition”vehicles only.Monitor operation is either “Continuous” or “Non-Continuous,”depending on the specific monitor.Continuous MonitorsThree of these Monitors are designed to constantly monitor theirassociated components and/or systems for proper operation.Continuous Monitors run constantly when the engine is running. TheContinuous Monitors are:Comprehensive Component Monitor (CCM)Misfire MonitorFuel System MonitorCarScan+ ABS/SRS 19
Page 2 and 3: Table of ContentsINTRODUCTIONWHAT I
Page 4 and 5: You Can Do It!EASY TO USE - EASY TO
Page 6 and 7: Safety PrecautionsSAFETY FIRST!To p
Page 8 and 9: About the Scan ToolBATTERY REPLACEM
Page 10 and 11: Scan Tool ControlsDISPLAY FUNCTIONS
Page 12 and 13: Scan Tool ControlsDISPLAY FUNCTIONS
Page 14 and 15: Onboard DiagnosticsCOMPUTER ENGINE
Page 16 and 17: Onboard DiagnosticsCOMPUTER ENGINE
Page 18 and 19: Onboard DiagnosticsDIAGNOSTIC TROUB
Page 22 and 23: Onboard DiagnosticsOBD2 MONITORSNon
Page 24 and 25: Onboard DiagnosticsOBD2 MONITORSthe
Page 26 and 27: Onboard DiagnosticsOBD2 MONITORSexh
Page 28 and 29: Onboard DiagnosticsOBD2 MONITORSPM
Page 30 and 31: Preparation for TestingPRELIMINARY
Page 32 and 33: Preparation for TestingPRELIMINARY
Page 34 and 35: Preparation for TestingVEHICLE SERV
Page 36 and 37: Using the Scan ToolCODE RETRIEVAL P
Page 42 and 43: Using the Scan ToolVIEWING ENHANCED
Page 50 and 51: Using the Scan ToolVIEWING ABS DTCs
Page 52 and 53: Using the Scan ToolVIEWING ABS DTCs
Page 54 and 55: Using the Scan ToolVIEWING SRS DTCs
Page 56 and 57: Using the Scan ToolERASING DIAGNOST
Page 58 and 59: Using the Scan ToolI/M READINESS TE
Page 60 and 61: Using the Scan ToolI/M READINESS TE
Page 62 and 63: Using the Scan ToolABOUT REPAIRSOLU
Page 64 and 65: Live Data ModeVIEWING LIVE DATAThe
Page 66 and 67: Live Data ModeRECORDING (CAPTURING)
Page 68 and 69: Live Data ModeRECORDING (CAPTURING)
Page 70 and 71:
Live Data ModeLIVE DATA PLAYBACK•
Page 72 and 73:
Additional TestsSPECIAL TEST MENUIn
Page 74 and 75:
Additional TestsSPECIAL TEST MENU6.
Page 76 and 77:
Additional TestsVIEWING VEHICLE INF
Page 78 and 79:
Additional TestsADJUSTMENTS AND SET
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Generic (Global) OBD2 PID ListToolD
Page 86 and 87:
Generic (Global) OBD2 PID ListToolD
Page 88 and 89:
Vehicle Applications - Makes Covere
Page 90 and 91:
GlossaryGLOSSAY OF TERMS AND ABBREV
Page 92 and 93:
Notes90 CarScan+ ABS/SRS
Page 94 and 95:
Notes92 CarScan+ ABS/SRS
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