Engine stalls

Special Tools Required

Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available

Note. Before beginning this troubleshooting

Make sure the battery is fully charged.
Make sure the fuel tank is at least 1/4 full.
Make sure the engine oil level is correct.

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DTC check: 1. Turn the ignition switch to ON (II). 2. Check for Pending or Confirmed DTCs with the HDS. DTC Description Confirmed DTC Pending DTC Freeze Frame Are any Pending or Confirmed DTCs indicated? YES : Go to the indicated DTC's troubleshooting. NO : Go to step 2. NOTE: If the HDS does not communicate with the vehicle, go to the PCM power and ground circuit troubleshooting.
Problem verification: 1. Set the HDS to record a HIGH-SPEED SNAPSHOT of following parameters for 30 seconds. ENGINE SPEED MAF SENSOR ECT SENSOR 1 BATTERY CKP NOISE CKP NO PULSE AF FB (ST FUEL TRIM) EVAP PC DUTY MISFIRE A/C CLUTCH PNP SWITCH SLIP RATIO OF TORQ OR START CLUTCH 2. Begin the snapshot, then start the engine and let it idle without load (in P or N). Did the engine stall? YES : Go to step 4 (diagnosis by parameter (MAF SENSOR)). NO : Go to step 3.
On-board snapshot check: 1. Check for a record of Engine Stall 2 in the on-board snapshot with the HDS Is there a Engine Stall 2 record in the on-board snapshot? YES : Go to step 4 (diagnosis by parameter (MAF SENSOR)). NO : Go to step 14 (fuel system troubleshooting). NOTE: If an engine stall on-board 2 snapshot was not found, the snapshot may have been lost due to low battery voltage or because of battery disconnection or replacement.
On-board snapshot check (MAF SENSOR): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the MAF SENSOR and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the MAF SENSOR pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 Poor connection of MAF SENSOR If the engine stalls 1-2 seconds after MAF SENSOR shows "0" g/s the engine stall may be caused by a faulty MAF sensor, poor connection, or electrical noise in the MAF sensor signal. Pattern 2 MAF SENSOR: Normal When the MAF SENSOR pattern matches ENGINE SPEED, the MAF sensor is normal. Which pattern is indicated? Pattern 1 Check the MAF sensor for loose terminals or poor connections. If the terminals and connections are OK, «SUBSTITUTE A KNOWN-GOOD MAF SENSOR»(ref-595375-S33779110012014013100000) . Pattern 2 The MAF sensor is OK. Go to step 5 (diagnosis by parameter (ECT SENSOR 1)).
On-board snapshot check (ECT SENSOR 1): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select ECT SENSOR 1 and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare ECT SENSOR 1 pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 ECT SENSOR 1 high When ECT SENSOR 1 indicates about 176°F (80 °C) or more when the engine is actually cold, ECT sensor 1 signal may be stuck high. If this occurs, the PCM may not properly compensate for cold engine operation, causing the engine to stall. Pattern 2 ECT SENSOR 1 normal If actual engine temp is similar to ECT SENSOR 1, ECT sensor 1 is normal. Which pattern is indicated? Pattern 1 Check for a short in ECT sensor 1 circuit and failure in ECT sensor 1. Pattern 2 ECT sensor 1 is OK. Go to step 6 (diagnosis by parameter (BATTERY)).
On-board snapshot check (BATTERY): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the BATTERY and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the BATTERY pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 BATTERY voltage low When the BATTERY voltage is excessively low, the PCM or unit stops functioning, causing engine stall. For PCM or each unit to start (functioning), more than 7.0 V is needed. Pattern 2 BATTERY voltage normal If the BATTERY voltage is above 12 V when the engine stalls, the battery is normal. Which pattern is indicated? Pattern 1 «TEST THE BATTERY»(ref-595374-S39564810022014013100000) , and check the battery cables and terminals. Pattern 2 The battery is OK. Go to step 7 (diagnosis by parameter (CKP NO PULSE)).
On-board snapshot check (CKP NO PULSE): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the CKP NO PULSE and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the CKP NO PULSE pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 CKP NO PULSE counts up when cranking When CKP NO PULSE counts up, the PCM is not receiving the CKP sensor signal. Pattern 2 The CKP NO PULSE indicates the pulse is normal The CKP sensor signal is OK when the CKP NO PULSE count does not increase. Which pattern is indicated? Pattern 1 «DO THE TROUBLESHOOTING PROCEDURE FOR DTC P0335»(ref-595391-S15525587622014013100000) . Pattern 2 Go to step 8 (diagnosis by parameter (CKP NOISE)).
On-board snapshot check (CKP NOISE): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the CKP NOISE and ENGINE SPEED in the configuration list. Check the recorded on-board snapshot parameters while the engine stall, then compare the CKP NOISE pattern from these charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 CKP NOISE counts up When CKP NOISE counts up, the PCM is receiving electrical noise along with the CKP sensor signal. Pattern 2 Normal when CKP NOISE does not count up The CKP sensor signal is OK when the CKP NOISE count does not increase. Which pattern is indicated? Pattern 1 «GO TO THE TROUBLESHOOTING PROCEDURE FOR DTC P0339»(ref-595437-S39984788752014013100000) . Check for after market accessories. Pattern 2 The CKP sensor is OK. Go to step 9 (diagnosis by parameter (ST FUEL TRIM)).
On-board snapshot check (AF FB (ST FUEL TRIM)): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the AF FB (ST FUEL TRIM) and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the AF FB (ST FUEL TRIM) pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 Engine stalls while AF FB (ST FUEL TRIM) value increases If the AF FB (ST FUEL TRIM) value increases when the engine stalls, there may be a lean condition. Pattern 2 Normal when the engine stalls when AF FB (ST FUEL TRIM) is around 1.0 (center value) The fuel trim is normal when the engine stalled with AF FB (ST FUEL TRIM) around 1.0 (center value). Pattern 3 Engine stalls when AF FB (ST FUEL TRIM) is around 0.8 When the value of AF FB (ST FUEL TRIM) is around 0.8, the PCM commands the purge control solenoid (PCS) to close (closed when EVAP PC DUTY is 0 %). If the AF FB (ST FUEL TRIM) does not move toward 1.0, the PCS may be leaking. Pattern 4 Normal when the engine stalls with AF FB (ST FUEL TRIM) is around 1.0 (center value) When the value of AF FB (ST FUEL TRIM) is around 0.8, the PCM commands the purge control solenoid (PCS) to close (closed when EVAP PC DUTY is 0 %). If the AF FB moves toward 1.0, the PCS is no leaking. Which pattern is indicated? Pattern 1 Diagnostic procedure: Check fuel pump operation sound. «GO TO THE FUEL PRESSURE TEST»(ref-595437-S26894210122014013100000) . GO TO THE FUEL PUMP CIRCUIT TROUBLESHOOTING . TEST THE PGM-FI MAIN RELAY . «TEST PGM-FI MAIN RELAY 2»(ref-595370-S03460466112014013100000) . Check for the following fuses: No. A23 (15 A) fuse (in the under-hood fuse/relay box) No. B4 (15 A) fuse (in the under-dash fuse/relay box) Pattern 3 Check the PCS for leaks. Pattern 2 and 4 Go to step 10 (diagnosis by parameter (MISFIRE)).
On-board snapshot check (MISFIRE): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the MISFIRE and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the MISFIRE pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 Engine stalls after MISFIRE counts up When engine stalls after MISFIRE count increases, the engine stall may be caused by misfire. Pattern 2 Normal when engine stalls with MISFIRE count remaining constant If the MISFIRE count remains constant when the engine stalls, the stall was not caused by misfire. Which pattern is indicated? Pattern 1 Diagnostic procedure: When misfire counts up without storing misfire DTC P0300-P0304, «GO TO THE DTC P0300-P0304 TROUBLESHOOTING»(ref-595370-S03460466112014013100000) . When the misfire count reaches prescribed value, DTC P0300-P0304 is stored. Go to the «DTC P0300: Random Misfire Detected; DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected»(ref-595437-S37748498082014013100000) . Pattern 2 Go to step 11 (diagnosis by parameter (A/C CLUTCH)).
On-board snapshot check (A/C CLUTCH): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the A/C CLUTCH and ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the A/C CLUTCH pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 Engine stalls when A/C is CLUTCH ON. If the engine stall occurs just after the A/C compressor clutch turns on, the stall may be caused by excessive A/C compressor load. Pattern 2 Engine stalls during A/C CLUTCH is OFF. If the engine stall occurs just when the A/C compressor clutch is off, the A/C system is not the cause of the engine stall. Which pattern is indicated? Pattern 1 Diagnostic procedure: Check for excessive charging of A/C refrigerant. Check for charging of other gas. Check for drag of the A/C compressor. Pattern 2 Go to step 12 (diagnosis by parameter (PNP SWITCH)).
On-board snapshot check (PNP SWITCH): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the PNP SWITCH and the ENGINE SPEED in the configuration list. Check the recorded snapshot parameters of the Engine Stall, then compare the PNP SWITCH pattern from the charts, and determine the problem. Pattern Symptom (Diagnosis by parameter) Additional remarks Pattern 1 A/T is in-gear condition In-gear condition when PNP SWITCH is "GEAR". Engine stall may be caused by A/T. (Engine also is a factor) Pattern 2 A/T is N or P condition N or P condition when PNP SWITCH is "P-N". The engine stall is not caused by A/T. A/T is not faulty. Which pattern is indicated? Pattern 1 Go to step 13 (diagnosis by parameter (SLIP RATIO OF TORQ OR START CLUTCH)). Pattern 2 Go to step 20 (fuse and relay check).
On-board snapshot check (SLIP RATIO OF TORQ OR START CLUTCH): NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure. 1. Check for a record of Engine Stall 2 in the on-board snapshot or the recorded snapshot with the HDS. 2. Select the SLIP RATIO OF TORQ OR START CLUTCH, ENGINE SPEED, VEHICLE SPEED in the configuration list. Check the recorded on-board snapshot parameters while the engine stall, then chose the SLIP RATIO OF TORQ OR START CLUTCH pattern from these charts, and determine the problem. Pattern Symptom (diagnosis by parameter) Additional remarks Pattern 1 Engine stall caused by lock up When engine stalls, SLIP RATIO OF TORQ OR START CLUTCH is near 100 % from deceleration to stopping, the engine stall is caused by lock up. Pattern 2 Lock up normal Lock up is normal when engine stalls with SLIP RATIO OF TORQ OR START CLUTCH near "0" in the middle of deceleration. Which pattern is indicated? Pattern 1 Go to the «Automatic Transmission Symptom Troubleshooting Index»(ref-595372-S19962052362014013100000) for torque converter clutch does not disengage. Pattern 2 Go to step 14 (fuel system troubleshooting).
Fuel pressure check: 1. Do «THE FUEL PRESSURE TEST»(ref-595372-S19962052362014013100000) . Is the fuel pressure OK? YES : Go to step 15 (ignition system troubleshooting). NO : Check for following pars: FUEL PUMP CIRCUIT FUEL PRESSURE REGULATOR Fuel filter See FUEL TANK UNIT DISASSEMBLY AND REASSEMBLY or FUEL TANK UNIT REMOVAL AND INSTALLATION
Spark plug visual check: 1. Turn the ignition switch to LOCK (0). 2. Remove the spark plugs See FUEL TANK UNIT DISASSEMBLY AND REASSEMBLY or FUEL TANK UNIT REMOVAL AND INSTALLATION . 3. Check conditions of spark plug electrode. NOTE: Make sure the spark plugs are the correct part number for the vehicle. If the plugs are aftermarket or they are not the correct part number, replace all of the plugs and retest. Is the electrode damage or wet? YES (wet) : Check the following conditions. If they are OK, go to step 16. In very cold conditions, multiple very short trips can cause the spark plug to foul. If this is the case, drive the vehicle a longer distance and recheck. Incorrect or poor quality fuel can cause a wet spark plug. Replace the fuel and recheck. YES (damaged) : REPLACE THE DAMAGED SPARK PLUGS , determine the cause of the spark plug damage. NO : Go to step 16.
Determine possible failure area (ignition system, others): 1. Select the ALL INJECTORS in the INSPECTION MENU with the HDS, and disable all the injectors. 2. Turn the ignition switch to LOCK (0). 3. Fit spark plug to the ignition coil and ground it to the engine. 4. Crank the engine and watch for spark at the spark plugs. Do the spark plugs spark? YES : The ignition system is OK. Select PCM reset in the PGM-FI INSPECTION MENU to cancel ALL INJECTORS with the HDS, then go to step 18 (engine compression troubleshooting). NO : Go to step 17.
Ignition coil power circuit check: 1. Disconnect the following connector(s). Ignition coil(s) 3P connector from the problem cylinder 2. Remove the ignition coil relay (A) from the under-hood fuse/relay box. 3. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) Ignition coil 3P connector: disconnected Ignition coil relay: disconnected Test circuit IG1(COIL), IG COIL RLY OUT Test point 1 Ignition coil 3P connector No. 1 (RED) Test point 2 Ignition coil relay 4P socket No. 2 (Under-hood fuse/relay box) Is there continuity? YES : The ignition coil power circuit is OK. REPLACE THE IGNITION COIL(S) . NO : Repair an open in the IG1(COIL)/IG COIL RLY OUT wire between the ignition coil relay and the ignition coil.
Engine compression check: 1. DO AN ENGINE COMPRESSION INSPECTION . Is the engine compression OK? YES : Go to step 19 (EVAP canister purge valve check). NO : Check for wear or damage to these parts: Incorrect valve clearance Confirmation of cam timing Oil pressure relief valve Damage or worn cam lobes Damage or worn valve and seats Damage cylinder head gasket Damage or worn piston rings Damage or worn piston and cylinder bore
EVAP canister purge valve check: 1. Turn the ignition switch to LOCK (0). 2. Disconnect the following connector. EVAP canister purge valve 2P connector 3. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in the engine compartment, and connect a vacuum pump/gauge, 0-30 inHg, to the EVAP canister purge valve. 4. Start the engine. Vacuum occurs in the vacuum pump? YES : When the climate is warm, fuel vapor from the tank enters the canister. If the purge control solenoid is leaking, this excessively rich mixture enters the intake manifold causing the engine to stall. If needed, REPLACE THE EVAP CANISTER PURGE VALVE . NO (Reproducible failure) : Go to step 20 (fuse check). NO (Intermittent failure) : Go to step 21 (relay check).
Fuse check: 1. Check the following fuses. Fuse No. A17 (15 A) to the ignition coil relay Fuse No. A18 (15 A) to the PGM-FI subrelay Fuse No. A23 (15 A) to PGM-FI main relay 1 Location Under-hood fuse/relay box Fuse No. B4 (15 A) to FGM-FI main relay 2 Location Under-dash fuse/relay box Are the fuses OK? YES : The fuses are OK. Go to step 21. NO : Replace the blown fuse(s).
Relay check: 1. «TEST THE FOLLOWING RELAYS»(ref-595374-S31125803172014013100000) : NOTE: In situations where the failure is difficult to reproduce, the following relays may have intermittent failure. PGM-FI main relay 2 Ignition coil relay PGM-FI main relay 1 PGM-FI subrelay Are the relays OK? YES : «GO TO THE DIAGNOSTIC INTERVIEW»(ref-595370-S03460466112014013100000) . NO : Replace any damaged relays.