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management system. This system incorporates many features to enhance performance, emissions, and drivability. One feature is the Self Diagnostic System. The self diagnostic system monitors engine operations and when a particular sensor or input varies out of specified operating parmeters, the “Check Engine” will be illuminated. The check engine lamp alerts the driver or technician that a problem exists in the EFI/TCCS ECU or Engine Control Unit or “computer.” When the check engine light is illuminated, it is indicating that a problem in the engine management system has been detected. At this time, a “code” may be stored in the ECU which pinpoints a possible component in the EFI/TCCS system. By checking the trouble codes, a possible problem could be narrowed down to a number of causes. While not an exact diagnostic tool, the check engine light and self-diagnostic system can get the individual working on his/her truck close to a possible fault, and, hopefully, to a successful repair. Reading the diagnostic trouble codes is very easy. You will need a paper clip to short the check connectors of the diagnostic connector. The diagnostic connector comes in two types. The early system is located on the inner-left fender well and is a round, green connector, usually located near the air cleaner. Simply jump the two terminals in this connector with the ignition switch in the “ON” position and the engine off. LOSS OF POWER SUPPLY TO ECU –IGNITION SWITCH/CIRCUIT –MAIN RELAY/CIRCUIT –ECU RPM SIGNAL-NO SIGNAL TO ECU FROM DISTRIBUTOR (”Ne” OR “G”) AFTER ENGINE HAS BEEN CRANKED –DISTRIBUTOR/CIRCUIT –STARTERSIGNAL CIRCUIT –IGNITER/IGNITER CIRCUIT –ECU. RPM SIGNAL-NO SIGNAL TO ECU FROM DISTRIBUTOR (”Ne” OR “G”) AFTER ENGINE HAS BEEN CRANKED –DISTRIBUTOR/CIRCUIT –STARTERSIGNAL CIRCUIT –IGNITER/IGNITER CIRCUIT –ECU. While a lot of the possible faults in the EFI system point to the ECU iteself, it should be noted that ECU failure is not common. The ECU should be replaced only as a last resort or if all diagnosises points to a bad ECU. Usually, troublesome EFI problems are a result of poor grounds, shorted wiring, and bad connectons at sensors.
Tags : engine management system, diagnostic connector, toyota diagnostic trouble codes, failur, engine operations, diagnostic system, relay circuit, switch circuit, ecu, diagnostic tool, efi, air cleaner, fender, faults, rpm
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