Question about 1997 Oldsmobile Aurora

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Failed ecm p0603

Last week my engine light went on. i had two codes come up, bank one and bank two- running too lean. so i figured it was my mass air flow sensor needed replacement A few days later the light goes off. Now it went back on but now i have two codes, bank one too lean and a p0603 that states- a random access memory fault/ failed ecm. any suggestions to what may be going wrong? would it be more likely my ecm or my pcm? this is not a cheep fix either or..

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  • Oldsmobile Master
  • 12,507 Answers

Instead of guessing as to what the problem is or expecting someone on here having a magical fix , take it to a qualified repair shop. Before assuming the worst an wanting to condem the PCM - powertrain control module . Will a scan tool communicate with it ? If your pulling codes it is .
DTC P0603 Control Module Long Term Memory Reset
The PCM has a memory area where it stores certain data it needs to save when the key is turned OFF. This area is called Keep Alive Memory. This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, DTC P0603 will set.
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

Have you disconnected the battery ?
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

Posted on Jun 21, 2017

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Posted on Jan 02, 2017

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  • 422 Answers

SOURCE: I have a 1999 oldsmobile

fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck

Posted on Aug 26, 2008

ewashmidas
  • 362 Answers

SOURCE: PO171 error code System too lean bank 1

Here are some possible causes, I would start with anything related to replacing the intake.

Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose

Posted on Jan 28, 2009

c17hydro
  • 2984 Answers

SOURCE: MASS AIR FLOW SENSOR REPLACEMENT & DIAGRAMS

Very easy for the Mass Air Flow Sensor....it is in the duct between the throttle body and the air filter box. Just unclamp the tube and remove the old and replace with the new.

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On your pack....I need the engine size.


Posted on Mar 26, 2009

  • 21 Answers

SOURCE: Rough Idle on start up: faulty O2 sensor?

try coolant temperature sensor

Posted on Aug 19, 2009

steve_e_uk
  • 1675 Answers

SOURCE: Fault code P0036: Bank One, sensor 2. Where is

hi normally this refers to the sensor that is past the cat on the exhaust you sometimes have two sensors, one on the manifold connected to the engine, and one part the way down the exhaust after the catalytic converter, and the code will stay until it is cleared by a diagnostic meter..hope this helps

Posted on Feb 22, 2010

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2 Answers

What does code p1131 mean on a 2001 ford taurus


P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

Tech notes

Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1131 Ford Description

A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

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1 Answer

P0603 code


I dont think you have a choice? i would Disconnect the battery, & check codes again after. If i have doubts, i alwyas start with the least exspensive parts first.

Apr 19, 2014 | 1997 Oldsmobile Aurora

1 Answer

P0603


Hello. You can give it a try by diconncting the battery. If it does give you problems again, then you need to go to a well know junkyard that have good condition cars and items. Look for the same cars as yours and get both the ecm and pcm.

Apr 19, 2014 | 1997 Oldsmobile Aurora

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I have a 2001 Jimmy with "Service Engine Soon"


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Last time you changed your fuel filter?
Look for any vacuum leaks.

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My truck is showing codes 171 and 174. Can you help


P0174 Generic Definition

Fuel Trim Bank Two Condition
- The ECM has detected a rich or lean air/fuel ratio condition on engine bank two

Probable Cause[s]

  1. If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault
  2. Failed HO2S21
  3. Ignition misfire condition
  4. Fuel injector problem
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    P0171 Generic Definition

    Fuel trim bank one condition
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    Probable Cause[s]

    1. If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) Sensor
    2. Oxygen sensor defective
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      Bank 1 and 2 running lean on computer scan po171,po174


      Doubt it.
      It would be highly unlikely for both O2 sensors to go bad. I strongly suspect they are reading what is actually happening,the engine is running lean. Probably from some un-metered air getting into the engine either from a vacuum leak or from a leak somewhere on the engine side of the mass air flow sensor. What usually causes a concern on this vehicle is the orings between the upper and lower intake manifold.

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