NO.5 ENGINE STALLS-AFTER START/AT IDLE [L8, LF]

id0103a0801100

5 | ENGINE STALLS—AFTER START/AT IDLE
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DESCRIPTION | • Engine stops unexpectedly at idle and/or after start.
POSSIBLE CAUSE | • Immobilizer system operating properly (Ignition key is not registered) • Immobilizer system and/or circuit malfunction • Air cleaner restriction • Electrical connector disconnection • Poor fuel quality • Air leakage from intake-air system • Restriction of intake-air system • Throttle valve malfunction • Vacuum leakage • Erratic signal to ignition coil • APP sensor and related wiring harness malfunction • TP sensor and related wiring harness malfunction • Improper operation of electronic throttle control system • No signal from CKP sensor due to sensor, related wire or wrong installation • Ignition coil related wiring harness malfunction • Spark plug malfunction • Restriction in exhaust system • Fuel supply system malfunction ― Fuel pump and fuel pump relay related circuit malfunction ― Fuel line clogging ― Fuel pump unit malfunction ― Fuel injector malfunction • Improper operation of A/C system • Purge solenoid valve malfunction • EVAP control system malfunction • Air leakage at intake-air system components • EGR valve malfunction • Improper operation of variable valve timing control system • Low engine compression • PCV valve malfunction • Improper valve timing • PCM malfunction Warning The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [L8, LF].) (See AFTER SERVICE PRECAUTION [L8, LF].) Caution • Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Connect the M-MDS to the DLC-2. Do the following conditions appear? • The engine is not completely started. • DTC P1260 is displayed. | Yes | Both conditions appear: • Go to Step 3.
No | Either or other condition appears: • Go to the next step.
2 | Does the engine stall after approx. 2 s since the engine is started? | Yes | Go to the next step.
No | Immobilizer system is normal: • Go to Step 10.
3 | Is the coil antenna connector securely connected? | Yes | Go to the next step.
No | Connect the coil antenna connector securely. Return to Step 2.
4 | Does the security light flash? | Yes | Go to the next step.
No | Inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION.) Replace the instrument cluster, if necessary. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
5 | Connect the M-MDS to the DLC-2. Retrieve the DTC for PCM and immobilizer system. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) (See DTC INSPECTION [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)].) Are any DTCs present? | Yes | Go to the appropriate DTC inspection. (See DTC TABLE [L8, LF].) (See DTC TABLE [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)].)
No | Go to the next step.
6 | Inspect the wiring harness between the following terminals and connectors: • Coil antenna terminal A and instrument cluster terminal 2S • Coil antenna terminal B and instrument cluster terminal 2Q Is there any malfunction? | Yes | Repair or replace the suspected wiring harness and connector.
No | Go to the next step.
7 | Inspect the wiring harness between the following terminals and connectors: • PCM terminal 1AI and instrument cluster terminal 1L • PCM terminal 1AM and instrument cluster terminal 1J | Yes | Repair or replace the suspected wiring harness and connector.
No | Go to the next step.
8 | Verify the following: • Air cleaner element • Electrical connections • Fuel quality: proper octane, contamination, winter/summer blend • Ignition wiring • No air leakage from intake-air system • No restriction of intake-air system • Proper sealing of intake manifold and components attached to intake manifold: EGR valve • Smooth operation of throttle valve • Vacuum connection Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results. Repeat Step 8.
No | Go to the next step.
9 | Perform the PID/DATA Monitor and Record Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) Access the APP1 and APP2 PIDs. Crank the engine with accelerator pedal released. Are the APP1 and APP2 PIDs indicating that the accelerator pedal is in the released position? | Yes | Go to the next step.
No | Inspect the following: • APP sensor (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L8, LF].) • Wiring harness between the following terminals and connectors: ― PCM terminal 1AJ and APP sensor terminal A ― PCM terminal 1AV and APP sensor terminal B ― PCM terminal 1AP and APP sensor terminal C ― PCM terminal 1AL and APP sensor terminal D ― PCM terminal 1AS and APP sensor terminal E ― PCM terminal 1AO and APP sensor terminal F Repair or replace the malfunctioning part according to the inspection results.
10 | Perform the PID/DATA Monitor and Record Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) Access the TP PID. Crank the engine with accelerator pedal released. Is the TP PID indicating that the accelerator pedal is in the released position? | Yes | Go to the next step.
No | Inspect the following: • TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [L8, LF].) • Wiring harness between the following terminals and connectors: ― PCM terminal 2AP and TP sensor terminal C ― PCM terminal 2AL and TP sensor terminal D ― PCM terminal 2AK and TP sensor terminal E ― PCM terminal 2AO and TP sensor terminal F Repair or replace the malfunctioning part according to the inspection results.
11 | Connect the M-MDS to the DLC-2. Perform the KOEO self test. (See KOEO/KOER SELF TEST [L8, LF].) If the engine stalls, Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) Are any DTCs present? | Yes | DTC is present: • Go to the appropriate DTC inspection. (See DTC TABLE [L8, LF].) Communication error message is displayed: • Inspect the following: ― Open circuit in wiring harness between main relay and PCM terminal1AW, 1BE ― Open circuit in wiring harness between main relay terminal E and PCM terminal 1Q ― Main relay is stuck open ― Open or short circuit in wiring harness between DLC-2 and PCM terminals 1AM and 1AI ― Open or poor ground circuit (PCM terminal 1BH, 1AZ, 1BD or 1BB) ― Poor connection of vehicle body ground • Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
12 | Attempt to start engine at part throttle. Does engine run smoothly at part throttle? | Yes | Perform the Electronic Throttle Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF].) Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
13 | Connect the M-MDS to the DLC-2. Perform the PID/DATA Monitor and Record Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) Access the RPM PID. Is the RPM PID indicating engine speed during engine cranking? | Yes | Go to the next step.
No | Inspect the following: • Open or short circuit in CKP sensor • Open or short circuit between CKP sensor terminal A and PCM terminal 2AB • Open or short circuit in between CKP sensor terminal B and PCM terminal 2W • Open or short circuit in wiring harness between CKP sensor terminal C and PCM terminal 2AQ • Open or short circuit in CKP sensor wiring harnesses Repair or replace the malfunctioning part according to the inspection results. If the CKP sensor and wiring harness are normal: • Go to the next step.
14 | Visually inspect CKP sensor and teeth of crankshaft pulley. Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
15 | Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders. Is there any malfunction? | Yes | Repair or replace the suspected wiring harness.
No | Go to the next step.
16 | Perform the Spark Test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF].) Is strong blue spark visible at each cylinder? | Yes | Go to the next step. If symptoms occurs with the A/C on: • Go to Step 21.
No | Repair or replace the malfunctioning part according to the inspection results.
17 | Inspect spark plug condition. (See SPARK PLUG INSPECTION [L8, LF].) Is the spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: • Inspect for fuel leakage from injector. Spark plug is grayish white: • Inspect for clogged fuel injector. Repair or replace the malfunctioning part according to the inspection results.
No | Install spark plugs on original cylinders. Go to the next step.
18 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
19 | Install the fuel pressure gauge between the fuel pipe and fuel distributor. Connect the M-MDS to the DLC-2. Perform the PID/DATA Monitor and Record Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) Turn the fuel pump on using FP PID in output state control of datalogger function. Is the fuel line pressure correct? (See FUEL LINE PRESSURE INSPECTION [L8, LF].) | Yes | Go to the next step.
No | Zero or low: • Inspect the fuel pump and fuel pump relay related circuit. • Inspect for clogged fuel line. • If there is no malfunction: ― Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF].) • If there is a malfunction: ― Repair or replace the malfunctioning part according to the inspection results. High: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF].)
20 | Visually inspect the fuel injector for fuel leakage O-ring and fuel line. Is the fuel line pressure held after the ignition switch is turned off? (See FUEL LINE PRESSURE INSPECTION [L8, LF].) | Yes | Go to the next step.
No | Inspect the fuel injector. (See FUEL INJECTOR INSPECTION [L8, LF].) If the fuel injector is normal: • Replace fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF].) If the fuel injector has a malfunction: • Replace fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [L8, LF].)
21 | Note • Following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. Connect the pressure gauges to A/C low and high pressure side lines. Turn the A/C on and measure low side and high side pressures. Are pressures within specifications? (See REFRIGERANT PRESSURE CHECK.) | Yes | Go to the next step.
No | If the A/C is always on, go to the symptom troubleshooting “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”. (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L8, LF].) For other symptoms, inspect the following: • Refrigerant charging amount • Condenser fan operation Repair or replace the malfunctioning part according to the inspection results.
22 | Disconnect vacuum hose between the purge solenoid valve and intake manifold from purge solenoid valve side. Plug the opening end of vacuum hose. Start the engine. Is the engine stall now eliminated? | Yes | Inspect if the purge solenoid valve is stuck open. (See PURGE SOLENOID VALVE INSPECTION [L8, LF].) Inspect the EVAP control system. Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
23 | Is air leakage felt or heard at the intake-air system components while racing the engine to higher speed? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
24 | Inspect engine condition while tapping the EGR valve housing. Does the engine condition improve? | Yes | Replace the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
25 | Perform the Variable Valve Timing Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF].) Does the variable valve timing control system operate properly? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
26 | Perform the “COMPRESSION INSPECTION”. (See COMPRESSION INSPECTION [L8, LF].) Is the engine compression correct? | Yes | Go to the next step.
No | Inspect for cause.
27 | Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L8, LF].) Is there any malfunction? | Yes | Replace the PCV valve.
No | Inspect the valve timing. Repair or replace the malfunctioning part according to the inspection results.
28 | Verify test results. • If normal, return to diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [L8, LF].) • If malfunction remains, inspect related Service information perform repair or diagnosis. ― If vehicle repaired, troubleshooting completed. ― If vehicle not repaired or additional diagnostic information not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [L8, LF].)