Intention of troubleshooting procedure

WARNING: This page is about a different variant/trim than selected.

Step 1-7
- Perform a fuel injector control system inspection.
Step 8-9
- Perform an emission system parts inspection.
Step 10-13
- Perform an intake air system parts inspection.
Step 14-17
- Perform a valve timing inspection.
Step 18-19
- Perform an exhaust system parts inspection.
Repair completion verification
- Verify that the primary malfunction is resolved and there are no other malfunctions.

P0171-00 (PCM (PYUL)) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: VERIFY IF MALFUNCTION RELATED TO LACK OF FUEL AFFECTS DIAGNOSTIC RESULTS Verify the remaining amount of fuel. Is there a lack of fuel?	Yes	Refill the fuel and perform the repair completion verification 1.
1		No	Go to the next step.
2	PURPOSE: INSPECT FUEL PRESSURE SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [FUEL PRESSURE SENSOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [FUEL PRESSURE SENSOR REMOVAL/INSTALLATION ] in Service Information).
3	PURPOSE: VERIFY HIGH PRESSURE FUEL PUMP FOR MALFUNCTION Inspect the applicable part. (Refer to [HIGH PRESSURE FUEL PUMP INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION ] in Service Information).
4	PURPOSE: VERIFY IF MALFUNCTION RELATED TO FUEL LEAK FROM FUEL SYSTEM OR RESTRICTION AFFECTS DIAGNOSTIC RESULTS Inspect the fuel system pipes (low to high pressure sides) for fuel leakage and restriction. Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
4		No	Go to the next step.
5	PURPOSE: VERIFY FUEL PUMP CONTROL MODULE FOR MALFUNCTION Inspect the applicable part. (Refer to [FUEL PUMP CONTROL MODULE INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [FUEL PUMP CONTROL MODULE REMOVAL/INSTALLATION ] in Service Information).
6	PURPOSE: VERIFY FUEL PUMP UNIT FOR MALFUNCTION Inspect the applicable part. (Refer to [FUEL PUMP UNIT INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [FUEL PUMP UNIT REMOVAL/INSTALLATION ] in Service Information).
7	PURPOSE: VERIFY FUEL INJECTOR FOR MALFUNCTION Inspect the applicable part. (Refer to [FUEL INJECTOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [FUEL INJECTOR REMOVAL/INSTALLATION ] in Service Information).
8	PURPOSE: VERIFY PURGE SOLENOID VALVE FOR MALFUNCTION Inspect the applicable part. (Refer to [PURGE SOLENOID VALVE INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [PURGE SOLENOID VALVE REMOVAL/INSTALLATION ] in Service Information).
9	PURPOSE: VERIFY PCV VALVE FOR MALFUNCTION Inspect the applicable part. (Refer to [POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION ] in Service Information).
10	PURPOSE: VERIFY MAF SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [MASS AIR FLOW (MAF) SENSOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ] in Service Information).
11	PURPOSE: VERIFY IF MALFUNCTION RELATED TO AIR CLEANER ELEMENT AFFECTS MEASUREMENT OF INTAKE AIR AMOUNT Inspect the applicable part. (Refer to [AIR CLEANER ELEMENT INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [AIR CLEANER ELEMENT REMOVAL/INSTALLATION ] in Service Information).
12	PURPOSE: VERIFY MAP SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 2 REMOVAL/INSTALLATION ] in Service Information).
13	PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE AIR SYSTEM AFFECTS DIAGNOSTIC RESULTS Visually inspect for loose, cracked or damaged hoses on intake air system. Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
13		No	Go to the next step.
14	PURPOSE: VERIFY ELECTRIC VARIABLE VALVE TIMING DRIVER FOR MALFUNCTION Inspect the applicable part. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION ] in Service Information).
15	PURPOSE: VERIFY ELECTRIC VARIABLE VALVE TIMING MOTOR FOR MALFUNCTION Inspect the applicable part. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
15		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION ] in Service Information).
16	PURPOSE: VERIFY ELECTRIC VARIABLE VALVE TIMING ACTUATOR FOR MALFUNCTION Inspect the applicable part. (Refer to [ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
16		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ELECTRIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION ] in Service Information).
17	PURPOSE: VERIFY OIL CONTROL VALVE (OCV) FOR MALFUNCTION Inspect the applicable part. (Refer to [HYDRAULIC VARIABLE VALVE TIMING ACTUATOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION ] in Service Information).
18	PURPOSE: VERIFY A/F SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [AIR FUEL RATIO (A/F) SENSOR INSPECTION ] in Service Information). Is the part normal?	Yes	Go to the next step.
18		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION ] in Service Information).
19	PURPOSE: VERIFY IF MALFUNCTION RELATED TO EXHAUST SYSTEM AFFECTS HO2S SIGNAL Verify the exhaust gas leakage from the exhaust system. (between A/F sensor and HO2S) Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
19		No	Go to the next step.
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (See CLEARING DTC ) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See Repeatability Verification Procedure ) Perform the DTC inspection for the PCM. (See DTC INSPECTION ) Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] ) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM. (Refer to [PCM REMOVAL/INSTALLATION ] in Service Information).
Repair completion verification 1		No	DTC troubleshooting completed.