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The CALPACK is a plug-in module separate from the PROM, that contains preset calibrations used by the system during "limp home" (backup) mode. When cold, the sensor is 'biased' by the ECM to about 450 millivolts. The ECM expects the sensor to warm in a short period of time and begin sending its own voltages. When the air is cold, the thermistor has a high resistance, which falls as the air charge warms.

Logged EuroSS I need a freakin' life eRep: 3 Offline Gender: Posts: 784 Re: GM OBD 1 Trouble Code Information « Reply #3 on: August 23, 2006, 01:29:07 PM » and If this code does appear, it is probably due to a loose connection or bad ground. This will cause the engine to idle very high. Sign in 296 19 Don't like this video?

TPS volts should be close to 0.42 V at closed throttle and rise smoothly in about 0.02 volt increments to a maximum reading of about 4.85 volts at WOT. When all stored codes have been displayed, the ECM will again flash code 12 to indicate the end of the diagnostic sequence. The conditions for setting this code are: the engine is running, and TPS reading is < 0.20 volts Note: During a Code 22 condition, the ECM uses a default TPS value Loading...

Loading... eRep: 12 Offline Gender: Posts: 2,149 Re: GM OBD 1 Trouble Codes « Reply #1 on: August 23, 2006, 02:33:14 AM » NOTE: Codes are not displayed in order of occurrence We certainly understand how frustrating it can be to look for a code definition and have it not online when you need it. Typical idle MAF is 5 to 7 grams per second.

If code 12 does not flash, that would indicate a communication problem with the ECM. If you find one missing let us know and we we'll add it immediately! These are listed in numerical order for easy searching. It will look like Morse Code, but it isn't, and is real easy to interpret.

If there is sufficient vacuum at the EGR valve, a switch closes to send a signal back to the ECM. Vehicle Specific Auto Repair Manual Code Diagnostics What do I do with the Codes? This should be the first suspect in the case of a Code 44 being set. Typical causes for this code include: 1) O2 sensor defective or lead shorted 2) Lean injectors (dirty or blocked) 3) Water in fuel 4) Exhaust leaks upstream of O2 sensor 5)

Its no big deal, it lets you know the ECM is in the "Field Service Mode" You will also notice the cooling fans come on, this is normal. If it is suspected this is causing a Code 53, contact the PROM manufacturer. Fault Code Description 12 - No Distributor reference pulse (diagnostic test active) Symptoms When flashing the Check Engine Light to read codes, code 12 will always display first, indicating the diagnostic The MAF sensor produces a frequency output; around 30 Hz at idle to 150 Hz under acceleration.

If you want to share this article or information with others, please link to this page, don't copy and paste it elsewhere. © 2004-2016 Close RepairPal Return to Chart CODE 54 Trouble Code 54 is not used by the turbo cars. Code 43 is set when: ?Voltage at Knock Sensor is above 4.8 volts or below .64 volts.?Either condition is met for about 10 seconds.Possible causes: 1.Open or shorted knock sensor2.Loose knock CTS is used to control fuel mixture, timing, idle speed, TCC and EGR operation, among others.

If you pull codes with a scantool and the car is running, this code will not show up. If you have a connector like this under your dash, read on... (note: this connector may have a black plastic cover over it, so also look for a cover shaped like This is less simple. Related Items:What needs to be done?

There are many components in the EGR system that could cause the code to set OTHER than the EGR valve itself! It expects to see no activity on this line at this time. Published on Apr 10, 2012Made a quick video on reading GM OBD-1 codes.Please consult the documentation in Chiltons, Haynes,or Alldata manual for your make/model. Please use the form on our Contact Page to get in touch with us.

The under dashcowl was removed prior to the test. Since water injection was never actually used, this code should never appear. The frequency varies proportionally to airflow. If a computer is connected to the car's ALDL connector when the code appears, check the computer cable connections.

When in this mode, the ECM will begin by flashing code 12 (on the lamp) 3 times. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. 2. Check for high fuel pressure, leaking or sticking injector.4.Foreign material in throttle body.5.Faulty IAC Valve electrical connections.6.Faulty PCV valve.7.Faulty IAC.8.Faulty ECM. Return to Chart CODE 32 Trouble Code 32 indicates that the Exhaust Gas Recirculation (EGR) valve diaphragm is not where the ECM expects it to be.

Please login or register. 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length Forum ARCHIVE»The IKF Goodness...»Automotive Tech. & Info»Topic: GM OBD This converter reads sensors (e.g., TPS, Oxygen) and coverts their analog voltage output to a digital number for use by the ECM. Once a DTC is set, the Check engine light will illuminate. The ECM checks this by initiating a conversion and timing how long it takes to complete.

The EGR has a vacuum bleed solenoid that adjusts the vacuum applied to the EGR valve based on this pulse width. We have a large number of resources to help you repair the problem. Next, proceed to our listing of GM 2-digit trouble codes to lookup what the codes mean. Code 25 will set if: ?MAT/IAT reading is > 293 deg F (135 deg C) for .2 seconds?vehicle speed is greater than 1 MPHTypical causes for this code include: 1.Defective MAT/IAT

Typical causes for this code include: 1) Incorrect PROM installed in the ECM 2) PROM incorrectly installed in the ECM 3) Defective PROM Some after market PROMs, particularly those designed as REPAIR GUIDES BECOME A MEMBER Sign up with Facebook OR I AGREE TO THE USER AGREEMENT LOG IN Login with Facebook OR REMEMBER ME BECOME A MEMBERFORGOT PASSWORD? The check engine light n...6 answersJanuary 30, 2009Check Engine Light OnI have had this car (bought new) for about 3 years. Code 52 gets set when: ?the ECM does not sense the CALPACKPossible causes include: 1.Incorrectly installed CALPACK module2.Incorrect CALPACK module for this vehicle3.Defective or incorrectly inserted PROM4.Defective ECM CODE 53 This

It is for this reason that it is recommended that the service manual be consulted while performing any adjustment or replacement of the Camshaft Sensor. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. Integrator and BLM numbers may indicate < 128 by a substantial margin. Rating is available when the video has been rented.

When in this mode, the ECM will begin by flashing code 12 on the CEL 3 times. The ECM expects the sensor to warm in a short period of time and begin sending its own voltages. This can damage the ECM and/or the drivetrain if the car is ran/driven like this. *More about code 12 can be read further on in this writeup. The conditions for setting this code are: no Code 34 or Code 35 (MAF error) present, and the O2 sensor voltage remains above 752 mV, and the ECM is in Closed

When the air is cold, the thermistor has a high resistance, which falls as the air charge warms.