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Engine Controls - Trouble Shooting - No Codes: Diagnosis Chevrolet Tracker II

Testing & Diagnostics ~1098 words

PRELIMINARY INSPECTION

  1. Verify on-board diagnostics are working by performing appropriate ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
  2. Ensure PCM and MIL function properly.
  3. Ensure no DTCs (except intermittent) are stored.
  4. Ensure fuel control system operates properly. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
  5. Perform fuel system pressure test.
  6. Visually inspect all systems.

After all checks have been performed, verify customer complaint and locate correct symptom. Check items indicated under that symptom. Not all items listed under each symptom apply to all models and systems. These procedures normally recommend testing of a specific system or component, such as EGR, TCC, etc. See appropriate SYSTEM & COMPONENT TESTING article for test procedures.

SYMPTOMS (GASOLINE)

Note. Before proceeding with any symptom diagnosis, perform all steps under PRELIMINARY INSPECTION .

Note. If PCM displays data but engine fails to start, see NO START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.

SYMPTOM DIAGNOSIS

Symptom checks should not be used unless symptom occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in appropriate BASIC DIAGNOSTIC PROCEDURES and SELF-DIAGNOSTICS articles were performed before diagnosing a symptom. Symptoms available for diagnosis include

  1. «Detonation/Spark Knock»(ref-126032-S27194488682001101800000)
  2. «Engine Backfires»(ref-126032-S00691526192001101800000)
  3. «Engine Cuts Out, Misses»(ref-126032-S28066226582001101800000)
  4. «Engine Dieseling/Run-On»(ref-126032-S25037985552001101800000)
  5. «Excessive Exhaust Emissions Or Odors»(ref-126032-S04228284792001101800000)
  6. «Hard Start»(ref-126032-S31996147242001101800000)
  7. «Hesitation, Sag Or Stumble»(ref-126032-S30635838612001101800000)
  8. «Lack Of Power Or Sluggish»(ref-126032-S07260486142001101800000)
  9. «Poor Fuel Economy»(ref-126032-S37414759202001101800000)
  10. «Poor Fuel Fill Quality»(ref-126032-S09241545972001102200000)
  11. «Rough, Unstable Or Incorrect Idle and Stalling»(ref-126032-S25797029042001101800000)
  12. «Vehicle Surges Or Chuggles»(ref-126032-S22827565592001101800000)

Symptom Definition

A mild to severe ping, usually worse during acceleration. Engine makes sharp metallic knocks which change with degree of acceleration.

Fuel ignites within intake manifold or in exhaust system, making a loud popping noise.

Cuts out, misses is defined as a steady pulsation or jerking following engine speed, usually more pronounced as engine load increases. Exhaust may have a steady spitting sound at idle or low speed. Perform visual inspection as described in appropriate BASIC DIAGNOSTIC PROCEDURES article.

Engine continues to run (but very rough) after ignition is turned off. If engine runs smoothly, check ignition switch.

Vehicle fails emission test. Vehicle may also emit "rotten egg" smell (hydrogen sulfide) from exhaust pipe.

Engine cranks okay, but does not start immediately. Engine eventually starts and may run okay or soon stall.

Momentary lack of response when accelerator is pushed down. May occur at any vehicle speed. Usually occurs after a stop. If severe enough, may cause engine to stall.

Engine delivers less power than expected. Little or no increase in speed when accelerator is applied.

Fuel economy, as measured by an actual road test, is noticeably lower than expected. Current fuel economy is noticeably lower than previous fuel economy.

Problem filling fuel tank.

Fuel tank overfill.

Premature shut off of fuel dispensing nozzle.

Fuel spitback.

Liquid to EVAP canister.

Liquid leak to ground.

Fuel odor.

Engine runs unevenly at idle. If bad enough, vehicle will shake. Idle RPM may vary. Engine idles at incorrect RPM.

Engine power varies under steady throttle or cruise. Feels like vehicle speeds up and slows down even though accelerator pedal position remains constant.

SYMPTOMS (DIESEL)

Note. Before proceeding with any symptom diagnosis, perform all steps under PRELIMINARY INSPECTION .

Note. If PCM displays data but engine fails to start, see NO START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.

Symptom checks should not be used unless symptom occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in appropriate BASIC DIAGNOSTIC PROCEDURES and SELF-DIAGNOSTICS articles were performed before diagnosing a symptom. Symptoms available for diagnosis include

  1. «Cuts Out &/Or Misses»(ref-126032-S27597065982001102300000)
  2. «Excessive Smoke»(ref-126032-S01202752792001102300000)
  3. «Fuel Knock/Combustion Noise»(ref-126032-S09669050772001102300000)
  4. «Hard Start»(ref-126032-S40325499812001101800000)
  5. «Hesitation, Sag &/Or Stumble»(ref-126032-S20509066832001102300000)
  6. «Lack Of Power, Sluggishness Or Sponginess»(ref-126032-S30817442532001102300000)
  7. «Poor Fuel Economy»(ref-126032-S15901415992001102300000)
  8. «Surge &/Or Chuggle»(ref-126032-S17058144302001101800000)

Constant jerking that follows engine speed, usually more pronounced with increased engine load. Not normally felt above 1500 RPM or 30 MPH. Engine has a steady spitting sound at idle or low speed. May cutout under hard acceleration.

White, black, gray or blue smoke under load, idle or initial starting hot or cold.

A mild to severe ping, usually worse under acceleration. Engine makes sharp metallic knocks that change with throttle opening.

Engine cranks okay, but does not start for a long time. Engine does eventually run, and may die immediately.

Vehicle has momentary lack of response when pushing down on accelerator pedal. Condition can occur at any speed but is most noticeable when accelerating from a stop. Condition may cause engine to stall if severe enough.

The engine delivers less than expected power. There is little or no increase in speed when partially applying the accelerator pedal.

Fuel economy, as measured by an actual road test, is noticeably lower than expected. Current fuel economy is noticeably lower than previous fuel economy.

SYMPTOMS

To trouble shoot the following symptoms, refer to appropriate number under PROBABLE CAUSES .

  1. Engine Lacks Power Check probable causes No. 1 , 3 , 4 , 6 - 11 and 16 - 21 .
  2. Black Smoke Check probable causes No. 2 - 4 , 6 - 11 and 16 - 21 .
  3. Blue Smoke Check probable causes No. 2 , 6 - 8 , 13 - 15 and 17 - 20 .
  4. Excessive Oil Consumption Check probable causes No. 2 , 6 - 8 , 13 - 15 and 17 - 20 .
  5. Noisy Operation Check probable causes No. 1 - 8 , 11 , 12 and 19 - 20 .
  6. Cyclic Sound From Turbocharger Check probable causes No. 2 , 19 and 20 .
  7. Oil Leak At Turbine Seal Check probable causes No. 13 - 15 and 17 - 20 .
  8. Oil Leak At Compressor Seal Check probable causes No. 2 , 8 - 11 , 13 - 15 and 17 - 20 .

PROBLEM DIAGNOSIS

Intermittent problem diagnosis requires duplication of circuit or component failure in order to identify problem. See TEST PROCEDURES . These procedures may lead to computer recording a DTC which may help diagnosis.

If problem vehicle does not produce a DTC, use a scan tool or DVOM to monitor voltage or resistance values while attempting to reproduce conditions which will create an intermittent problem. A change in status on scan tool or DVOM indicates a problem has been located.

When monitoring voltage, ensure ignition switch is in ON position or engine is running. When monitoring resistance (ohms), ensure ignition switch is in OFF position or negative battery cable is disconnected. A status change on scan tool or DVOM while performing test procedures indicates area of problem.

Malfunction Indicator Light (MIL) comes on but does not stay on. A stored DTC may or may not exist.

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