This diagnosis for code:-P1128 closed Loop Fueling not accomplished - bank 1 Upstream- P1129 closeup of the door Loop Fueling not achieved - financial institution 2 UpstreamP1128, P1129 code- This diagnostic runs once the following problem are met, shortly after engine start up, fuel level above12%, battery voltage above 11. Volts, no energetic bank 1 fuel injector, ignition coil, or upstream O2 sensor circuit faults.


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Set condition, once the permit time has actually been reached and enable condition are met, the diagnostic will examine for nearby loop fuel control. If close loop control is not energetic by the time the permit timer has expired, the diagnostic will certainly fail. Defaul action, MIL irradiate is illuminate.

Possible causes P1128 and P1129 code

- Rectricted fuel supply line- Fuel pump inlet strainer plugged- Fuel pump module- O2 sensor heater operation- O2 sensor signal circuit- O2 sensor circuit- O2 sensor- ECT sensor operation- Engine mechanically Problem- Fuel filter/pressure regulator- Powertrain control Module (PCM)

Diagnostic test P1128 and also P1128 code

Step 1. ECT sensor operation
Diagnose and also repair any other O2 sensor DTCs that room present before continuing through test procedure. This test works finest if perfromed ~ above a cold engine (cold soak).Turn the ignition on, v the scan tool, review the engine cooland temperature (ECT) sensor value. If the engine was allowed to sit overnight (cold soak), the temperature valeu have to be a cautious value the is somewhare close to it is in ambient temperature. To compare the ECT sensor value v the IAT sensor and also AAT sensor values. If engine coolant temperature is above82°C (180°F), allow the engine to cool till 65°C (150°F) is reached. Begin the engine and permit it come idle, during engine warm-up, monitor the ECT sensor value. The temperature value adjust should be a smooth transition from begin up to regular operating temperature82°C (180°F). The value should reach at the very least 82°C (180°F).Is the ECT Sensor value within a reasonable variety with the other sensors in ~ ignition on and did the ECT valueincrease smoothly and also did it reach at the very least 82°C (180°F)?Yes, walk to step 2.No, verify that there is great pin come terminal call in the engine coolant temperature sensor and also powertrain regulate Module (PCM). If ok, change the Engine coolant temperature.Step 2. Inspect for an energetic DTCWith the scan tool read DTCs and also record on the repair order. Test journey or operate the vehicle.Is the DTC active or pending?Yes, go to step 3.No, carry out thePCM intermittent condition.Step 3. Examine te fuel shipment systemPerform the checking the fuel distribution system.Were any kind of problems found?Yes, perform the proper procedure.No, walk to action 4.Step 4. O2 sensor heater operationTurn the ignition off. Wait a minimum of 10 minutes to allow the O2 sensor come cool down prior to continuing the test. Enable the sensor voltage come stabilize at 5.0 volts. Revolve the ignition on with the scan tool actuate the sensor 1/1 heater test (for P1128 code) and 2/1 heater check (for P1129 code). With the scan tool monitor O2 sensor 1/1 (for P1128 code) and also 2/1 (for P1129 code) voltage for at the very least two minutes.Does the voltage stay above 4.5 volts?Yes, verify that there is great pin terminal call in the O2 sensor and also Powertraint control Module connectors. If difficulties are found, change the O2 sensor.No, walk to action 5.Step 5. Examine the O2 sensor operationStar the engine, with the scan tool monitor the O2 sensor 1/1 (for P1128 code) and also O2 sensor 2/1 (for P1129 code) reading.If one sensor of the O2 sensor signal or return circuit is shorted to ground the scan tool will display all O2 senspr voltage low. O2 sensor that is shorted to ground will screen a voltage reading close to or in ~ 0 volts. If among the O2 sensor signal or return circuits are shorted to voltage, the scan tool will display all O2 sensor voltage readings high.Is the voltage switching in between 2.5 and 3.4 volts?Yes, walk to action 8.No, walk to step 6.Step 6. Check the upstream O2 sensor return circuitTurn the ignition on, engine not running, disconnect the O2 sensor 1/1 (for P1128 code) and also O2 sensor 2/1 (for P1129 code) harness connector. Measure up the voltage ~ above the O2 sensor return circuit in the O2 sensor exploit connector.Is the voltage at 2.5 volts?Yes, walk to action 7.No, check the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code)return circuit because that a short to ground, open or brief to voltage and also repair if necessary. Inspect the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code) connector and also the PCM connector. If no troubles are found, replace and also program the Powertrain regulate Module (PCM). Carry out thePowertrain confirmation Test.Step 7. Inspect theO2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code)signal circuitWith the scan device monitor the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code) voltage. O2 sensor should read in between 4.1 and also 5.0 volts on the scan tool with the connector disconnected. Connect a jumper between the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code)signal circuit and the O2 sensor return circuit at the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code)harness connector. The voltage should drop from in between 4.1 and also 5.0 volts v the jumper in place.Did the O2 sensor voltage adjust from between 4.1 and 5.0 volts with the jumper installed?Yes, verify that there is an excellent pin come terminal contact in the O2 sensor and also Powertrain control Module connectors. If no difficulties are found, replace the O2 sensor.No, check the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code)signal circuit for a short to ground, open up or quick to voltage and repair if necessary. Examine the O2 sensor 1/1 (for P1128 code)and O2 sensor 2/1 (for P1129 code)connector and also the PCM harness connector.

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If no problems are found, walk to step 9.Step 8. Engine mechanical problem
Turn the ignition off, examine for any of the complying with conditions/mechanical problems:Air induction mechanism - need to be cost-free from leaksEngine vacum - need to be at least 13 inches in neutralEngine valve time - need to be in ~ specificationsEngine compression - have to be within specificationsEngine exhaust mechanism - need to be cost-free of any type of restrictions or leaksEngine PCV system - must flow freelyTorque converter stall speed - must be within specificationsPower brake booster - no inner vacuums leaksFuel - should be free contaminationFuel injector - plugged or limited injector, control wire not linked to exactly injector