1994 camaro multiple codes - bad pcm?
February 26th, 2015, 3:09 PM
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1994 camaro multiple codes - bad pcm?
my camaro recently lit up the MIL. The car is a 12 pin ALDL '94 camaro z28. I scanned it and she dropped ten codes on me. There is a number of sensors experiencing low voltage but the one that caught my eye was DTC51. The car starts easily and runs like a champ. Can it really need a new PCM/PROM? Or am I just seeing the car in limp home mode?
The recorded codes are:
14 - coolant sensor - low voltage
34 - MAP sensor low voltage
45 - rich exhaust
44 - lean exhaust
43 - Electronic Spark Control - low voltage
42 - Electronic spark timing (EST) open or shorted
55 - ECM fault or oxygen sensor fault
54 - Fuel pump circuit fault or mixture control or ECM fault
53 - System voltage too high - over 17.7 volts to ECM or alternator voltage not normal - the volt meter on the dash looks normal
I want to think there is some sort of short or bad ground that causing all these low voltage codes. However, my understanding of DTC51 is that it is a checksum error on the PROM.
If it is a short, where do I even start looking for it?
What do you think is wrong with it?
thanks,
j.
The recorded codes are:
14 - coolant sensor - low voltage
34 - MAP sensor low voltage
45 - rich exhaust
44 - lean exhaust
43 - Electronic Spark Control - low voltage
42 - Electronic spark timing (EST) open or shorted
55 - ECM fault or oxygen sensor fault
54 - Fuel pump circuit fault or mixture control or ECM fault
53 - System voltage too high - over 17.7 volts to ECM or alternator voltage not normal - the volt meter on the dash looks normal
I want to think there is some sort of short or bad ground that causing all these low voltage codes. However, my understanding of DTC51 is that it is a checksum error on the PROM.
If it is a short, where do I even start looking for it?
What do you think is wrong with it?
thanks,
j.
February 26th, 2015, 5:45 PM
#2
my camaro recently lit up the MIL. The car is a 12 pin ALDL '94 camaro z28. I scanned it and she dropped ten codes on me. There is a number of sensors experiencing low voltage but the one that caught my eye was DTC51. The car starts easily and runs like a champ. Can it really need a new PCM/PROM? Or am I just seeing the car in limp home mode?
The recorded codes are:
14 - coolant sensor - low voltage
34 - MAP sensor low voltage
45 - rich exhaust
44 - lean exhaust
43 - Electronic Spark Control - low voltage
42 - Electronic spark timing (EST) open or shorted
55 - ECM fault or oxygen sensor fault
54 - Fuel pump circuit fault or mixture control or ECM fault
53 - System voltage too high - over 17.7 volts to ECM or alternator voltage not normal - the volt meter on the dash looks normal
I want to think there is some sort of short or bad ground that causing all these low voltage codes. However, my understanding of DTC51 is that it is a checksum error on the PROM.
If it is a short, where do I even start looking for it?
What do you think is wrong with it?
thanks,
j.
The recorded codes are:
14 - coolant sensor - low voltage
34 - MAP sensor low voltage
45 - rich exhaust
44 - lean exhaust
43 - Electronic Spark Control - low voltage
42 - Electronic spark timing (EST) open or shorted
55 - ECM fault or oxygen sensor fault
54 - Fuel pump circuit fault or mixture control or ECM fault
53 - System voltage too high - over 17.7 volts to ECM or alternator voltage not normal - the volt meter on the dash looks normal
I want to think there is some sort of short or bad ground that causing all these low voltage codes. However, my understanding of DTC51 is that it is a checksum error on the PROM.
If it is a short, where do I even start looking for it?
What do you think is wrong with it?
thanks,
j.
(maybe you bought his car!
)Please start here:
https://chevroletforum.com/forum/gen...-advice-70981/
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