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DTC Troubleshooting

DIAGNOSIS PROCEDURE - DTC P1175 LAMBDA CONTROLLER LIMIT MALFUNCTION BANK 2 (TOO LEAN)

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD) System Check.
Is the system check complete?		 - Go to Step 2. Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK ".
2
  1. Install the scan tool to the Data Link Connector (DLC).
  2. Turn the ignition ON.

Are any component related Diagnostic Trouble Codes (DTCs) set?		 - Go to applicable DTC TABLE . Go to Step 3.
3 With the engine running, operate the vehicle until the LOOP STATUS indicates closed.
Is the Long Term Fuel Trim value above the specified value?		 -49% Go to Step 4. Go to Step 5.
4
  1. Turn the ignition switch to ON, with the engine OFF.
  2. Review the Freeze Frame data and note the parameters.
  3. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting The DTC as noted.

Does the Long Term Fuel Trim value above the specified value while operating under the specified conditions?		 -49% Go to Step 21. Go to Step 5.
5 Visually/physically check the air cleaner filter for excessive dirt or being plugged and repair as needed.
Is the repair complete?		 - Go to Step 21. Go to Step 6.
6 Visually/physically check the air intake system for collapsed or restricted and repair as needed.
Is the repair complete?		 - Go to Step 21. Go to Step 7.
7 Inspect the throttle body inlet for damaged or foreign objects which may partially block the airflow and repair as needed.
Is the repair complete?		 - Go to Step 21. Go to Step 8.
8
  1. Turn the ignition OFF.
  2. Inspect the throttle bore, throttle plate and Idle Air Control (IAC) passages for clocking and foreign objects and repair as needed.

Is the repair complete?		 - Go to Step 21. Go to Step 9.
9 Start the engine with the vehicle in park or neutral and A/C off and note the idle quality.
Is a low or unsteady idle being experienced?		 - Go to Step 10. Go to Step 12.
10 Idle the engine.
Are the IAC counts below the specified value?		 100 Go to Step 12. Go to Step 11.
11
  1. Turn the ignition OFF.
  2. Disconnect the Manifold Absolute Pressure (MAP) sensor electrical connector.
  3. Start the engine.
  4. Operate the vehicle in Closed Loop while monitoring the Long Term Fuel Trim value.

Does the Long Term Fuel Trim value increase above the specified value?		 -9% Go to Step 20. Go to Step 12.
12 Check the IAC valve performance and repair as necessary.
Is the repair complete?		 - Go to Step 21. Go to Step 13.
13
  1. Disconnect the vacuum hose from the fuel pressure regulator and inspect the hose for the presence of fuel.
  2. If fuel is presence in the vacuum hose, replace the fuel pressure regulator.

Is the repair complete?		 - Go to Step 21. Go to Step 14.
14
  1. Turn the ignition ON.
  2. Slowly press the acceleration pedal.

Does the Throttle Position (TP) sensor display increase steady and evenly from its minimum voltage at closed throttle to its maximum voltage at Wide-Open Throttle (WOT).		 - Go to Step 15. Go to Step 19.
15
  1. Perform the Fuel System Diagnosis.
  2. If the table isolate a problem, repair as needed.

Is the repair complete?		 - Go to Step 21. Go to Step 16.
16
  1. Perform the Evaporative Emission (EVAP) Control System Diagnosis.
  2. If the table isolate a problem, repair as needed.

Is the repair complete?		 - Go to Step 21. Go to Step 17.
17
  1. Perform the FUEL INJECTOR BALANCE TEST .
  2. If the table isolate a problem, repair as needed.

Is the repair complete?		 - Go to Step 21. Go to Step 18.
18
  1. Remove the Oxygen Sensor (O2S).
  2. Visually/physically inspect the O2S for silicone contamination.
  3. Note: this will be indicated by a powdery white deposit on the portion of the O2S exposed to the exhaust stream.
  4. If contamination is present on the O2S, find the source and repair as needed.

Is the repair complete?		 - Go to Step 21. Go to "DIAGNOSTIC AIDS ".
19
  1. Check the TP sensor mounting screws.
  2. If they are too loose or missing tighten or replace them as needed.
  3. If the screws are OK, replace the TP sensor.

Is the repair complete?		 - Go to Step 21. -
20
  1. Turn the ignition OFF.
  2. Replace the MAP sensor.

Is the repair complete?		 - Go to Step 21. -
21
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.

Does the scan tool indicate that this diagnostic has run and passed?		 - Go to Step 21. Go to Step 2.
22 Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?		 - Go to applicable DTC TABLE . System OK
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