Question about 2000 Nissan Altima

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MY ECM WONT DISPLAY CODES ON CODE READER NO POWER

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Check your cigarette lighter fuse to see if it is blown. Some vehicles use this circuit to power up the data link connector.

Posted on Jun 21, 2009

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A 2005 Ford F250 Super Duty Turbo wont start started yesterday and now won't start today the code reader on it and it gave me two codes po237 u0155 where can I find this and how can I get it fixed


code u0155 refers to lost communication with instrument panel cluster (IPC) control module
check wiring connections or replace the control module
code p 0237 refers to manifold absolute pressure (MAP) sensor AQ TC system --low input====causes ---wiring short to ground ---MAP sensor ---ECM

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WHILE DRIVING THE CAR STALLS OUT UNLESS IPULL THE FUSES AND PUT BACK IN CAR WON'T START ALSO CAN'T PULL UP ANY CODES THE CODE READER STATES THERE IS NO POWER


you could have a faulty ecm, first check all the fuses if good, try a different scanner, if you still have a no power reading on the scanner, it is probably a faulty ecm

Oct 13, 2015 | Cars & Trucks

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Mercury sable 1996 turns over wont start


Pull the error codes in the ECM to see what is causing the no-start. It could be a faulty fuel pump or fuse for the pump or???? Don't guess---pull the codes and don't waste time and money. Even if you have to purchase an inexpensive code reader

Apr 03, 2015 | 1996 Mercury Sable

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Get codes for my 1997 blazor


Code Reader or Professional Scan Tool
to retrieve codes & other data

Nov 20, 2014 | 1997 Chevrolet Blazer

1 Answer

How to replace ecm


Check the fuse for the ecm before replacing it. If you have a ford eec diagnostic try to get the codes. If you don't have a eec code reader there is a way to get the codes out by counting dashboard blinks. If you can get the ecm to output the codes the ecm is not bad.

Apr 02, 2014 | 1994 Chevrolet Astro

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What button sequence to I press on the vic to get the cpu codes for the check engine light?


Reading & Clearing Codes READING CODES (EXCEPT CADILLAC) Fig. 4: Example of a code 12 displayed on the check engine lamp 79222g25.gif
Since the inception of electronic engine management systems on General Motors vehicles, there has been a variety of connectors provided to the technician for retrieving Diagnostic Trouble Codes (DTC)s. Additionally, there have been a number of different names given to these connectors over the years; Assembly Line Communication Link (ALCL), Assembly Line Diagnostic Link (ALDL), Data Link Connector (DLC). Actually when the system was initially introduced to the 49 states in 1979, early 1980, there was no connector used at all. On these early vehicles there was a green spade terminal taped to the ECM harness and connected to the diagnostic enable line at the computer. When this terminal was grounded with the key ON, the system would flash any stored diagnostic trouble codes. The introduction of the ALOL was found to be a much more convenient way of retrieving fault codes. This connector was located underneath the instrument panel on most GM vehicles, however on some models it will not be found there. On early Corvettes the ALOL is located underneath the ashtray, it can be found in the glove compartment of some early FWD Oldsmobiles, and between the seats in the Pontiac Fiero. The connector was first introduced as a square connector with four terminals, then progressed to a flat five terminal connector, and finally to what is still used in 1993, a 12 terminal double row connector. To access stored Diagnostic Trouble Codes (DTC) from the square connector, turn the ignition ON and identify the diagnostic enable terminal (usually a white wire with a black tracer) and ground it. The flat five terminal connector is identified from left to right as A, B, C, D, and E. There is a space between terminal D and E which permits a spade to be inserted for the purposes of diagnostics when the ignition key is ON. On this connector terminal D is the diagnostic enable line, and E is a ground. The 12 terminal double row connector has been continually expanded through the years as vehicles acquired more on-board electronic systems such as Anti-lock Brakes. Despite this the terminals used for engine code retrieval have remained the same. The 12 terminal connector is identified from right-to-left on the top row A-F, and on the bottom row from left-to-right, G-L. To access engine codes turn the ignition ON and insert a jumper between terminals A and B. Terminal A is a ground, and terminal B is the diagnostic request line. Stored trouble codes can be read through the flashing of the Check Engine Light or on later vehicles the Service Engine Soon lamp. Trouble codes are identified by the timed flash of the indicator light. When diagnostics are first entered the light will flash once, pause; then two quick flashes. This reads as DTC 12 which indicates that the diagnostic system is working. This code will flash indefinitely if there are no stored trouble codes. If codes are stored in memory, Code 12 will flash three times before the next code appears. Codes are displayed in the next highest numerical sequence. For example, Code 13 would be displayed next if it was stored in memory and would read as follow: flash, pause, flash, flash, flash, long pause, repeat twice. This sequence will continue until all codes have been displayed, and then start all over again with Code 12. CLEARING CODES (EXCEPT CADILLAC) Except Riviera, Toronado and Trofeo: To clear any Diagnostic Trouble Codes (DTC's) from the PCM memory, either to determine if the malfunction will occur again or because repair has been completed, power feed must be disconnected for at least 30 seconds. Depending on how the vehicle is equipped, the system power feed can be disconnected at the positive battery terminal pigtail, the inline fuse holder that originates at the positive connection at the battery, or the ECM/PCM fuse in the fuse block. The negative battery terminal may be disconnected but other on-board memory data such as preset radio tuning will also be lost. To prevent system damage, the ignition switch must be in the OFF position when disconnecting or reconnecting power. When using a Diagnostic Computer such as Tech 1, or equivalent scan tool to read the diagnostic trouble codes, clearing the codes is done in the same manner. On some systems, OTC's may be cleared through the Tech 1, or equivalent scan tool. On Riviera, Toronado and Trofeo, clearing codes is part of the dashboard display menu or diagnostic routine. Because of the amount of electronic equipment on these vehicles, clearing codes by disconnecting the battery is not recommended. Riviera, Toronado and Trofeo (Non-CRT/DID Vehicles) — Using The On-Board Diagnostic Display System: First turn the ignition to theON position. On Riviera depress the OFF and TEMP buttons on the ECCP at the same time and hold until all display segments light. This is known as the Segment Check. On Toronado and Trofeo follow the same procedure, however, depress the OFF and WARMER buttons on the ECOP instead. After diagnostics is entered, any OTC's stored in computer memory will be displayed. Codes may be stored for the PCM, BCM, PC or SIR systems. Following the display of OTC's, the first available system for testing will be displayed. For example, 'EC?' would be displayed on Riviera for EOM testing, while on Toronado and Trofeo the message 'ECM?' will appear. The message is more clear on these vehicles due to increased character space in the IPO display area.
  1. Depress the 'FAN UP' button on the ECCP until the message 'DATA EC?' appears on the display for Riviera, or 'ECM DATA?' is displayed on Toronado and Trofeo.
  2. Depress the 'FAN DOWN' button on the ECCP until the message 'CLR E CODE' appears on the display for Riviera, or 'ECM CLEAR CODES?' is displayed on Toronado and Trofeo.
  3. Depressing the 'FAN UP' button on the ECCP will result in the message 'E CODE CLR' or 'E NOT CLR' on Riviera, 'EOM CODES CLEAR' or 'ECM CODES NOT CLEAR' on Toronado and Trofeo. This message will appear for 3 seconds. After 3 seconds the display will automatically return to the next available test type for the selected system. It is a good idea to either cycle the ignition once or test drive the vehicle to ensure the code(s) do not reset. Toronado and Trofeo (CRT/DID Equipped) — Using The On-Board Diagnostic Display System: First turn the ignition switch to theON position. Depress the 'OFF' hard key and 'WARM' soft key on the CRT/DID at the same time and hold until all display segments light. This is the 'Segment Check.' During diagnostic operation, all information will be displayed on the Driver Information Center (DIC) located in the Instrument Panel Cluster (IPC). Because of the limited space available single letter identifiers are often used for each of the major computer systems. These are: E for ECM, B for 6CM, I for IPC and R for SIR. After diagnostics is entered, any OTC's stored in computer memory will be displayed. Codes may be stored for the PCM, BCM, PC or SIR systems. Following the display of OTC's, the first available system for testing will be displayed. This will be displayed as 'ECM?'.
  4. Depress the 'YES' soft key until the display reads 'ECM DATA?'.
  5. Depress the 'NO' soft key until the display reads 'ECM CLEAR CODES?'.
  6. Depressing the 'YES' soft key will result in either the message 'ECM CODES CLEAR' or 'ECM CODES NOT CLEAR' being displayed, indicating whether or not the codes were successfully cleared. This message will appear for 3 seconds. After 3 seconds the display will automatically return to the next available test type for the selected system. It is a good idea to either cycle the ignition once or test drive the vehicle to ensure the code(s) do not reset.

Jul 10, 2010 | 1992 Oldsmobile Toronado

1 Answer

My CEL is on, my code reader reads no codes, sees no live data for any sensor. the jeep seems to run okay, is ecu bad?


Sometimes the code reader will not read the Mopar/Jeep codes. This is different system, CAN system. Drive to your local AutoZone to get your codes from your ECU/ECM.

Jan 23, 2010 | 1999 Jeep Cherokee

1 Answer

Can not read ecm code for emission check in GA


Check to see if their is power going to the OBC...

Mar 22, 2009 | 1997 Hyundai Accent

2 Answers

How can you chek codes on you own ithout a computer


To check the codes on a 1995 you need an ODB code reader, then you connect the code reader to the ECM (computer module) that is located under the hood.

You find more details and explanation on how to read codes on the website below:


Jeep Grand Cherokee WJ - Diagnostic Trouble Codes

Feb 18, 2009 | 1995 Jeep Grand Cherokee

1 Answer

1993 Cadillac Deville Phantom Codes


ECM Output Cycling

This mode can be initiated after "E.9.5" is displayed on the "Fuel Data Center". The display of the "E.9.5" can be reached by depressing the Hi button while Code ".7.0" is displayed. The ECM output cycling mode, Code "E.9.6." turns the ECM's outputs on and off. To enter the output cycling mode, proceed as follows;

The engine must be running.

Turn the cruise instrument panel switch to the on position so that the cruise control outputs will cycle.

Turn the engine off and within two seconds, turn the ignition on.

Enter the diagnostics and display Code "E.9.5".

Depress the accelerator pedal (throttle switch open) and release it (throttle switch closed). The ECM output cycling mode begins as the display switches from Code "E.9.5" to Code "E.9.6."

It is possible to leave the ECM output cycling mode at any time and return to ".7.0" by clearing the ECM and BCM codes. If the display does not advance to Code "E.9.6", refer to Code "E.7.2" of the switch test.

The output cycling mode will end automatically after two minutes of cycling and the display will switch from Code "E.9.6" to Code "E.9.5".

The outputs will cycle on and off every three seconds until the two minute automatic shut off occurs. The only exception to this three second cycle is the cruise control power valve which cycles continuously. If additional output cycling is desired, recycle the throttle switch.

Oct 13, 2008 | 1993 Cadillac DeVille

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