Bench Testing $8D ~ Error code 33 Map Voltage High

[dave w]

I can test $8D on my test bench/harness I built. Never had a light for the map sensor. I have a vac pump hooked up to the map sensor to give it some vaccum when running the system. But even in the few times I ran the dist with a drill and never gave the map sensor any vac, I never got a map sensor error code.

That's what I was wondering. I seem to remember, the other $8D systems I bench tested did not have MAP error codes. Maybe I need to try a different MAP sensor? Thanks for the input JeepsAndGuns.

dave w

[dave w]

I tried a different MAP, same code 33.

dave w

[JeepsAndGuns]

I'm sure you already double checked all the wiring, all the pins and checked for proper 5v refrence to the map sensor?

[dave w]

I'm sure you already double checked all the wiring, all the pins and checked for proper 5v refrence to the map sensor?

The wiring should be OK.
Using TunerPro RT I get the following MAP Sensor Voltages:
100 Kpa = 4.75 Volts DC
60 Kap = 2.62 Volts DC
20 Kpa = 0.50 Volts DC

dave w

[dave w]

I went back to a previous (Feb 2012) $8D bench test I did. This $8D application was for an Edelbrock MPFI system. Same results then, error code 33. Maybe it's the way I bench test using a complete system, everything hooked up, then spin the distributor?

dave w

[EagleMark]

There are some RPM, time and TPS qualifiers in the Error 33 above...

[JeepsAndGuns]

I have pretty much everything hooked up when I do mine. Well all the basic stuff. I have a TB with tps, iac, a map sensor, coil, ignition module, injectors, iat, cts. I do not have a knock sensor or a o2 sensor. I have a bin set up with egr turned off, and codes for knock sensor, egr, and o2 sensor turned off. I use it just for bench testing ecm's.

http://www.youtube.com/watch?v=2aj9OpJUi-A

[EagleMark]

The Error 33 was on first frame of log, before start so it was probably stored.

The way you started the bench engine it had 57.xx MAP when key on then RPM increased, does not look like it fell in line of passing test. Start with clear codes, no vacuum, start bench engine and apply vacuum.

Batt volts were also a little low in the 11.xx volt range which is sometimes an issue?