My longstanding CEL problem has finally been diagnosed
02-23-2004, 01:50 PM
#1
Former Sponsor
Thread Starter
My longstanding CEL problem has finally been diagnosed
hardtopguy called me today to let me know his tech had found the source of my CEL problem, which has been bugging me for over 6 months and has defied the capabilities of three Honda dealers here in Baltimore.
Evidently there is some fault in the electronics that results in low voltage to the injector circuitry, causing a sporadic lean condition that triggers the 300, 301, 302, 303, and 304 CEL. The Ganley tech is now trying to isolate the source of the fault in the circuitry. I'm going to pore over the Helm manual tonight to see if I can understand this.
BTW, Ganley found this fault almost immediately after its first tests. This is proof that the right tech with the right equipment can diagnose a problem most dealers find intractable.
Three cheers for Ganley Honda!!!!
I just wish they weren't so far away.
Evidently there is some fault in the electronics that results in low voltage to the injector circuitry, causing a sporadic lean condition that triggers the 300, 301, 302, 303, and 304 CEL. The Ganley tech is now trying to isolate the source of the fault in the circuitry. I'm going to pore over the Helm manual tonight to see if I can understand this.
BTW, Ganley found this fault almost immediately after its first tests. This is proof that the right tech with the right equipment can diagnose a problem most dealers find intractable.
Three cheers for Ganley Honda!!!!
I just wish they weren't so far away.
02-23-2004, 01:58 PM
#4
Registered User
Rick:
What circuit is that in? I would be delighted to look at the schematic. A low-voltage is almost always one of two things: 1)) A reduction in input voltage, or 2) increased resistance causing an in-value voltage to be dissipated as heat.
I have seen defective or aging sensors go spotty, and I have seen cars that were flooded by salt or brackish water start to cause the wiring to corrode, underneath the insulation! Or, the salt was pervasive enough that even weather-pack type connectors in critical areas started to corrode. You might check each connector - sometimes just unplugging and re-connecting will "break" an oxide layer.
Even cars near the ocean or in areas of high airborne contaminants can have this poblems. Anyway, post or PM me some details and I will take a look-see.
What circuit is that in? I would be delighted to look at the schematic. A low-voltage is almost always one of two things: 1)) A reduction in input voltage, or 2) increased resistance causing an in-value voltage to be dissipated as heat.
I have seen defective or aging sensors go spotty, and I have seen cars that were flooded by salt or brackish water start to cause the wiring to corrode, underneath the insulation! Or, the salt was pervasive enough that even weather-pack type connectors in critical areas started to corrode. You might check each connector - sometimes just unplugging and re-connecting will "break" an oxide layer.
Even cars near the ocean or in areas of high airborne contaminants can have this poblems. Anyway, post or PM me some details and I will take a look-see.
02-23-2004, 03:12 PM
#5
Former Sponsor
Thread Starter
Originally posted by Road Rage
Rick:
What circuit is that in? I would be delighted to look at the schematic. A low-voltage is almost always one of two things: 1)) A reduction in input voltage, or 2) increased resistance causing an in-value voltage to be dissipated as heat.
I have seen defective or aging sensors go spotty, and I have seen cars that were flooded by salt or brackish water start to cause the wiring to corrode, underneath the insulation! Or, the salt was pervasive enough that even weather-pack type connectors in critical areas started to corrode. You might check each connector - sometimes just unplugging and re-connecting will "break" an oxide layer.
Even cars near the ocean or in areas of high airborne contaminants can have this poblems. Anyway, post or PM me some details and I will take a look-see.
Rick:
What circuit is that in? I would be delighted to look at the schematic. A low-voltage is almost always one of two things: 1)) A reduction in input voltage, or 2) increased resistance causing an in-value voltage to be dissipated as heat.
I have seen defective or aging sensors go spotty, and I have seen cars that were flooded by salt or brackish water start to cause the wiring to corrode, underneath the insulation! Or, the salt was pervasive enough that even weather-pack type connectors in critical areas started to corrode. You might check each connector - sometimes just unplugging and re-connecting will "break" an oxide layer.
Even cars near the ocean or in areas of high airborne contaminants can have this poblems. Anyway, post or PM me some details and I will take a look-see.
02-23-2004, 06:35 PM
#6
Former Sponsor
Thread Starter
The Helm manual is indicating a possible short or open in the harness between the ECU and fuel injectors or a bad ECU, so if Jeff replaces the ECU, an answer should emerge quickly.
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02-26-2004, 06:20 AM
#9
Former Sponsor
Thread Starter
Update. It appears to be a faulty ECU. Jeff replaced it and no CELs have apppeared through a number of driving cycles. We'll see as further testing goes on.
