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Originally Posted by mysocal911
Right, their "upgrade" is a modification to always have the monitors set.
If the ECU is really a '96, the modification is complicated compared to
the later ECU ('97/'98) and less reliable. By the way, neither ECU has
a chip socket, i.e. the main difference is that the later ECU is flash-able.
Also, the '96 does not have an inherent problem retaining the monitors
with the key 'off'.
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Dave is correct, and I was wrong about the soldered vs socketed chips.
The 95 993 has the socketed chip. 96 thru 98 have soldered chips, but the 97 & 98 DME are flashable, whereas the 96 is not.
Quote:
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So, I found a company in Florida that will go over my DME and upgrade it to make the monitors easier to set. Sounds good to me. Any opinions? Cost would be 695
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The cost is unnecessary...
I reset my drive cycle monitors the first time out, per the sequenced resetting procedure.
Drive Cycles
I used the cycle out of Adrian Streather’s “Porsche 993: The Essential Companion” (p. 192). It specified:
Cold start, idle for 10 to 15 minutes
Drive at 2200 rpm for 8 miles
Drive at 2500 rpm for 5 miles
Drive at 1800 rpm for 8 miles
Allow to idle for 3 minutes.
Since it specifies rpm rather than speed, it is easier to do.
Porsche 993 cycle"
1) Start cold engine and idle for approximately 2 minutes, 10 seconds. This checks secondary air injection and evaporative leak detection systems.
2) Accelerate to 20-30 MPH and maintain steady speed for 3 minutes, 15 seconds. This establishes closed loop oxy-sensor operations, response times & switching times.
3) Accelerate to 40-60 MPH and maintain steady speed for 15-20 minutes. This evaluates catalytic converters while oxy-sensor response and switching times are checked.
4) De-accelerate and come to a stop. Idle for 5-6 minutes. This checks evaporative leak detection system.
Remember:
The diagnostic checks above will be discontinued if:
1) Engine speeds exceed 3000 RPM
2) Large fluctuations in throttle position
3) Road speeds exceed 60 MPH
I hope this helps...
p.s. Go to rennlist.com, to the 993 forum and search on, "drive monitors"