Inspection and verification
1. Make sure the customer's complaint is valid.
2. Visually inspect for obvious mechanical and electrical problems.
Mechanical factors | Electrical Factors |
3. If an obvious cause of a problem you identified or described by a customer is found, resolve it before proceeding to the next steps (if possible).
4. Use an approved diagnostic system or scan tool (tester), to retrieve all DTCs before referring to the symptom table or DTC index (DTC).
Clear all DTCs after troubleshooting.
Symptom table
Symptom (general) | Symptom (specific) | Possible reasons | Actions |
Lack of launch | Engine cranks but won't start | Check the level and condition of the fuel. Refer to the Ignition Coil Malfunction DTCs in this Index for ignition system checks. Check the fuel system. Check the circuits of the CrM sensor. See the relevant section of the workshop manual. If there is any doubt about the functionality of the module, refer to the Warranty Policy and Procedures Manual. | |
Lack of launch | Engine cranks and flashes but won't start | Check the evaporative emission system purge valve. Check the fuel system. See the relevant section of the workshop manual. Check the condition and gaps of the spark plugs. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. | |
Difficulty starting | Hot Start Difficulties | Check injectors and fuel system. Check fuel temperature sensor circuits, IAT and MAF. Check the evaporative emission system purge valve. See the relevant section of the workshop manual. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. | |
Difficulty starting | Difficulty starting after a hot soak (the vehicle is aged after the engine has reached operating temperature) | Check injectors and fuel system. Check fuel temperature sensor circuits, IAT and MAF. Check the evaporative emission system purge valve. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. See the relevant section of the workshop manual. | |
Engine stalls | Engine stalls shortly after starting | Check engine ventilation system. Check the operation of the ECM relay. Check MAF sensor circuits. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. For information about the intake system. Check fuel lines for leaks/damage. See the relevant section of the workshop manual. | |
Poor overall vehicle handling | Engine acceleration lag/poor acceleration | Check the operation of the fuel pump module. Check fuel lines for leaks/damage. Check the injectors. Check air intake system for leaks. Check the TP sensor and throttle motor circuits. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. Check EGR valves. Check for DTCs related to HO2 sensors. For information on the gearbox. Check the movement of the accelerator pedal. Check the electrical circuits of the APP sensor. See the relevant section of the workshop manual. | |
Poor overall vehicle handling | Backfires in the engine | Check the operation of the fuel pump module. Check fuel lines for leaks/damage. Check air intake system for leaks. Check MAF sensor circuits. Check for DTCs related to HO2 sensors. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. Check the VCT and APP sensor circuits. See the relevant section of the workshop manual. | |
Poor overall vehicle handling | Engine Jerks | Check the operation of the fuel pump module. Check fuel lines for leaks/damage. Check MAF, TP and throttle motor sensor circuits, refer to electrical manual. For ignition coil checks, refer to ignition coil malfunction DTCs in this Index. |
DTC index
NOTE: Universal Scan Tools cannot read the listed codes or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7 digit code to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).
NOTE: See Section 303-14 for a complete list of ECM DTCs "Electronic engine management system" in the workshop manual.
DTCs | Description | Possible reasons | Actions |
P030000 | Random misfire/series of misfires reported | Refer to the Ignition Coil Malfunction DTCs in this Index for ignition coil checks. Check the condition and gaps of the spark plugs. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. | |
P030100 | Cylinder #1 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETALQ guided diagnostic program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030200 | Cylinder #2 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETALT Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030300 | Cylinder #3 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETALR Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030400 | Cylinder #4 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETALU Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030500 | Cylinder #5 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETALS Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030600 | Cylinder #6 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETALV Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030700 | Cylinder #7 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETAME Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P030800 | Cylinder #8 Misfire Registered | Refer to P030000 for possible causes | Refer to the ETAMF Guided Diagnostic Program for this code on the approved diagnostic system for ignition coil tests. Check the condition and gap of the spark plug. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. |
P031600 | Misfire at startup (detected at first 1000 rpm) | Perform the checks specified for a normal misfire code, but with a cold engine. | |
P035100 | Cylinder #1 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to ETALQ Guided Diagnostic Program for this code on an approved diagnostic system. | |
P035200 | Cylinder #2 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETALT Guided Diagnostic Program for this code on an approved diagnostic system. | |
P035300 | Cylinder #3 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETALR guided diagnostic program for this code on an approved diagnostic system. | |
P035400 | Cylinder #4 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETALU Guided Diagnostic Program for this code on an approved diagnostic system. | |
P035500 | Cylinder #5 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETALS guided diagnostic program for this code on an approved diagnostic system. | |
P035600 | Cylinder #6 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETALV Guided Diagnostic Program for this code on an approved diagnostic system. | |
P035700 | Cylinder #7 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETAME guided diagnostic program for this code on an approved diagnostic system. | |
P035800 | Cylinder #8 Ignition Coil Primary/Secondary Circuit | Refer to the electrical manual and check the electrical circuit of the ignition coil. Ignition system checks are described in the appropriate section of the workshop manual. Refer to the ETAMF Guided Diagnostic Program for this code on an approved diagnostic system. | |
P131500 | Resistant misfire | Refer to the Ignition Coil Malfunction DTCs in this Index for ignition coil checks. Check the condition and gaps of the spark plugs. Check for fuel pressure and injector DTCs, refer to the appropriate section in the workshop manual. | |
P136700 | Additional code for the ignition system | Refer to the electrical manual and check the electrical circuit between the ignition coils and the ECM. Make any necessary repairs. Refer to the Ignition Coil Malfunction DTCs in this Index for ignition coil checks. | |
P136800 | Additional code for the ignition system | Refer to the electrical manual and check the electrical circuit between the ignition coils and the ECM. Make any necessary repairs. Refer to the Ignition Coil Malfunction DTCs in this Index for ignition coil checks. |
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