[goodhart]

Originally Posted by awd laser

is there a way to find it out without a data logger?

Originally Posted by goodhart

To check your CEL go to VFAQ and click on DSM>Electrical>Retrieving Diagnostic Error Codes 1G. Follow those directions. Also, the stock boost gauges are crap, they don't even read actual boost, so don't even bother looking at that thing.

I'll copy paste them for you since you didn't want to follow the directions I laid out:

From VFAQ:

There will be a diagnostic code inside the ECU (Electronic Control Unit) if and only if the 'Check Engine' light on the lower left portion of the dash is illuminated. To get the code that the ECU is reporting follow these steps:

1. Locate the engine diagnostic test terminal located at the top of the drivers side kick panel (next to the fuse box). See illustration[/FONT]
   
   
   You will want to count the pulses that are produced from the MPI terminal. The easiest way I found was to buy a 12v electric buzzer (Radio Shack #273-055 $2.49) and attach its leads to the terminal connector, then just listen for the pulses. You can also use an analog voltmeter and count the pulses displayed.
   
   There are two types of pulses we are looking for "long" and "short". We are looking for a pattern where we have a series of long pulses (1 or more) and a series of short pulses (1 or more), then more long pulses. The codes always start with a long pulse and will finish with a short pulse. So start counting with the first long pulse after a short one. Count until you hear a long pulse after a short one again. NOTE: If you hear a constant "buzz", then your ECU is reporting that there is a problem with the ECU itself, if you hear only short pulses, there is no error code to report (i.e. normal state).
2. Lets say we write down: S-S-L-L-S-S-S-L-L. We know that we start and stop with a long pulse after a short one. So that happens at two places in our example. At the 2nd/3rd pulse set, and at the 7th/8th pulse set. The pulses between those two are what we want: L-L-S-S-S.
3. Now that you have the code, we need a code number. For every long pulse count it as a 10, and every short pulse counts as 1. So in our example, it is 10-10-1-1-1. Add them up and that is your code number, in our example 23.
4. Find your code number below and the resulting diagnostic item.

Self-Diagnosis Codes for 1.8L and 2.0L Engines Code #Diagnostic Item ConstantECU11O2 sensor
12 Volume air flow sensor
13 Intake air temperature sensor
14 Throttle position sensor
15 (1.8L only)Idle speed control motor position sensor
21 Engine coolant temperature sensor
22 Crankshaft position sensor
23 Camshaft position sensor
24 Vehicle speed sensor
25 Barometric pressure sensor
31 (2.0L Only)Knock sensor (turbo only)
36 (1.8L Only)Ignition timing adjustment signal
41 Injector
42 Fuel pump
43 EGR (Ca. only)
44 (2.0L Only)Ignition coil, ignition power transistor unit short pulses only normal state