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Engine Will Not Start, Engine Starts But Stalls Immediately, Or Engine Is Hard To Start




Engine

Fuel and Emissions Systems Symptom Troubleshooting - Engine will not start, engine starts but stalls immediately, or engine is hard to start

Engine will not start, engine starts but stalls immediately, or engine is hard to start

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.

1. DTC check:

-1. Turn the ignition switch to ON (II).

-2. Check for Pending or Confirmed DTCs with the HDS.

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 PCM Power And Ground Circuit Troubleshooting.

2. Immobilizer system check:

-1. Select HDS immobilizer set-up, select immobilizer information, then select status log.
NOTE: When the status log count is found, it means the immobilizer system has prohibited the engine from starting in the past.
The number of status log count shows the frequency that the system has prohibited the engine from starting in the past.
If immobilizer system has not status log count, the system is normal.

Was the status log count found?
-YES- Go to Immobilizer system, Status Log Immobilizer System Status Log.
-NO- Go to step 3.

3. Problem verification (snapshot sampling):

-1. Set the HDS to record a HIGH-SPEED SNAPSHOT of following parameters for 30 seconds.
* ENGINE SPEED
* MAP SENSOR
* MAF SENSOR
* ECT SENSOR 1
* BATTERY
* CKP NOISE
* CKP NO PULSE
* CMP NOISE
* CMP NO PULSE
* IMMOBILIZER

-2. Begin the snapshot, then try to start the engine.

Was the engine hard to start?
-YES- Go to step 6 (diagnosis by parameter troubleshooting).
-NO- Go to step 4.

4. On-board snapshot check (engine will not start):

-1. Check for a record of Hard to Start Engine in the on-board snapshot with the HDS.

Hard to Start Engine in the on-board snapshot recorded?
-YES- Go to step 6 (diagnosis by parameter troubleshooting).
-NO- Go to step 5.

5. On-board snapshot check (engine stall):

-1. Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.
NOTE: When Hard to Start on-board snapshot data was not recorded, use the Engine Stall on-board snapshot data and check the cause of failure.

Engine Stall as on-board snapshot recorded?
-YES- Go to step 18 (diagnosis by parameter (ST FUEL TRIM)).
-NO- Go to step 20 (fuel system troubleshooting).
NOTE: In the following conditions, the on-board snapshot will not be recorded when the engine stalls.
* Ignition switch turned to LOCK (0) shortly after starting the engine.
* Vehicle is out of the Hard to start condition to record an on-board snapshot (see the gray zone of following graph).
* Low or dead battery
* Disconnecting the battery










6. On-board snapshot or snapshot check (IMMOBILIZER):

NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure.

-1. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the IMMOBILIZER and ENGINE SPEED in the configuration list.
Compare the snapshot parameters while the engine is cranking, from the chart, to determine the problem.










Which pattern is indicated?
-Pattern 1- The immobilizer system has failure. Go to the immobilizer system check Immobilizer System Check.
-Pattern 2- The immobilizer system is OK. Go to step 7 (diagnosis by parameter (ENGINE SPEED)).

7. On-board snapshot or snapshot check (ENGINE SPEED):

NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure.

-1. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the ENGINE SPEED pattern chart in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- The engine cranking speed is OK. Go to step 8 (diagnosis by parameter (BATTERY)).
-Pattern 2- Diagnostic procedure:
1. Test the battery. Component Tests and General Diagnostics
2. Check the battery cables and connections.
3. Check the starter; KA KC models Removal and Replacement.
4. Check the engine friction.

8. On-board snapshot or snapshot check (BATTERY):

NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure.

-1. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the BATTERY and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the BATTERY pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Diagnostic procedure:
1. Test the battery. Component Tests and General Diagnostics
2. Check the battery cables and connections.
-Pattern 2- The battery is OK. Go to step 9 (diagnosis by parameter (ECT SENSOR 1)).

9. On-board snapshot or 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. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select ECT SENSOR 1 and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the ECT SENSOR 1 pattern from the chart, and determine the problem.






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 10 (diagnosis by parameter (MAP SENSOR)).

10. On-board snapshot or snapshot check (MAP SENSOR):

NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure.

-1. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the MAP sensor and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the MAP SENSOR pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Check the port of MAP sensor for clogging. If port is OK, substitute a known-good MAP sensor Service and Repair. Also check for clogging in the exhaust system.
-Pattern 2 (Reproducible failure)- The MAP sensor is OK. Go to step 11 (diagnosis by parameter (MAF SENSOR)).
-Pattern 2 (Intermittent failure)- The MAP sensor is OK. Go to step 12 (diagnosis by parameter (CMP NO PULSE)).

11. Snapshot check (MAF SENSOR):

-1. Select the Hard to Start Engine in the snapshot with the HDS.

-2. Select the MAF sensor and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the MAF SENSOR pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1 and 2- Check for loose terminal or poor connection at the MAF sensor. If the terminals and connections are OK, substitute a known-good MAF sensor Service and Repair.
-Pattern 3- The MAF sensor is OK. Go to step 12 (diagnosis by parameter (CMP NO PULSE)).

12. On-board snapshot or snapshot check (CMP NO PULSE):

NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure.

-1. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the CMP NO PULSE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CMP NO PULSE pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Do the troubleshooting procedure for DTC P0365 DTC Troubleshooting. If the CMP NO PULSE count reaches the threshold, DTC P0365 will set. Check for poor connections and loose terminals at the CMP sensor.
-Pattern 2- Go to step 13 (diagnosis by parameter (CMP NOISE)).

13. On-board snapshot or snapshot check (CMP NOISE):

NOTE: Use the on-board snapshot in case of intermittent failure, or use the snapshot in case of reproducible failure.

-1. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the CMP NOISE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CMP NOISE pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Do the troubleshooting procedure for DTC P0369 DTC Troubleshooting. If the CMP NOISE count reaches the threshold, DTC P0369 will set. Check for poor connections and loose terminals at the CMP sensor.
-Pattern 2- The CMP sensor is OK. Go to step 14 (diagnosis by parameter (CKP NO PULSE)).

14. On-board snapshot or 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. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the CKP NO PULSE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CKP NO PULSE pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Do the troubleshooting procedure for DTC P0335 DTC Troubleshooting. If the CKP NO PULSE count reaches the threshold, DTC P0335 will set. Check for poor connections and loose terminals at the CKP sensor.
-Pattern 2- Go to step 15 (diagnosis by parameter (CKP NOISE)).

15. On-board snapshot or 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. Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.

-2. Select the CKP NOISE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CKP NOISE pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Do the troubleshooting procedure for DTC P0339 DTC Troubleshooting. If the CKP NOISE count reaches the threshold, DTC P0339 will set. Check for poor connections and loose terminals at the CKP sensor, and also check for aftermarket accessories.
-Pattern 2 (Reproducible failure)- The CKP sensor is OK. Go to step 16 (diagnosis by parameter (VTEC PRES SW)).
-Pattern 2 (Intermittent failure)- The CKP sensor is OK. Go to step 17 (diagnosis by parameter (Engine Stall in the on-board snapshot)).

16. Snapshot check (VTEC PRES SW):

-1. Check the parameter(s) below with the HDS when the engine is cranking.






Do the current condition(s) match the threshold?
-YES- Substitute a known-good rocker arm oil control valve Rocker Arm Oil Control Valve Removal And Installation. If the valve is OK, replace the oil pump Engine Oil Pump Removal And Installation.
-NO- Go to step 20 (fuel system troubleshooting).

17. On-board snapshot check (Engine Stall):

-1. Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.

Engine stall in the on-board snapshot recorded?
-YES- Go to step 18 (diagnosis by parameter (ST FUEL TRIM)).
-NO- Go to step 20 (fuel system troubleshooting).

18. On-board snapshot check (ST FUEL TRIM):

-1. Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.

-2. Select the ST FUEL TRIM and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters when the Engine Stalls, then compare the ST FUEL TRIM pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Diagnostic procedure:
1. Check fuel pump operation sound.
2. Go to the Fuel pressure test. Testing and Inspection
3. Go to the Fuel pump circuit troubleshooting. Testing and Inspection
4. Test the PGM-FI main relay Testing and Inspection.
5. Test PGM-FI main relay 2 Testing and Inspection.
6. Check for the following fuses:
*No. A21 (15 A) fuse (in the under-hood fuse/relay box)
*No. B4 (15 A) fuse (in the under-dash fuse/relay box)
-Pattern 2- Go to step 19 (diagnosis by parameter (MISFIRE)).

19. On-board snapshot check (MISFIRE):

-1. Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.

-2. Select the MISFIRE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters when the engine stalls, then compare the MISFIRE pattern from the chart, and determine the problem.






Which pattern is indicated?
-Pattern 1- Do the troubleshooting procedure for DTC P0300-P0304 troubleshooting DTC Troubleshooting.
-Pattern 2- Go to step 20 (fuel system troubleshooting).

20. Fuel pressure check:

-1. Do the fuel pressure test Testing and Inspection.

Is the fuel pressure OK?
-YES- Go to step 21 (ignition system troubleshooting).
-NO- Check the following:
* Fuel pump circuit Testing and Inspection
* Fuel pressure regulator Fuel Tank Unit Disassembly And Reassembly
* Fuel filter Fuel Tank Unit Disassembly And Reassembly

21. Spark plug visual check:

-1. Turn the ignition switch to LOCK (0).

-2. Remove the spark plugs. Service and Repair

-3. Check the conditions of the spark plug electrode.
NOTE: Make sure the plugs are genuine parts.

Is the electrode damaged or wet?
-YES (wet)- Check the following conditions. If they are OK, go to step 22.
* 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 Service and Repair, determine the cause of the spark plug damage.
-NO- Go to step 22.

22. Determine possible failure area (ignition system, others):

-1. Turn the ignition switch to LOCK (0).

-2. Select ALL INJECTORS in the INSPECTION MENU with the HDS, and stop fuel injection from injector.

-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 plug.

Is there spark?
-YES- The ignition system is OK. Select PCM reset in the INSPECTION MENU to cancel ALL INJECTORS with the HDS, then go to step 24 (engine compression troubleshooting).
-NO- Go to step 23.

23. Ignition coil power circuit check:

-1. Disconnect the following connector(s).






-2. Remove the ignition coil relay (A) from the under-hood fuse/relay box.






-3. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- The ignition coil power circuit is OK. Replace the ignition coil(s) Service and Repair.
-NO- Repair an open in the IG1(COIL)/IG COIL RLY OUT wire between the ignition coil relay and the ignition coil.

24. Engine compression check:

-1. Do an engine compression inspection. Testing and Inspection
NOTE: When removing the spark plugs, make sure the plugs are genuine parts.

Is engine compression OK?
-YES- Go to step 25 (EVAP canister purge valve check).
-NO- Repair the cause of low compression.

25. EVAP canister purge valve check:

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following 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 purge valve.






-4. Start the engine.

Is there vacuum?
-YES- Replace the EVAP canister purge valve Service and Repair.
-NO (Reproducible failure)- Go to step 26 (fuse check).
-NO (Intermittent failure)- Go to step 27 (relay check).

26. Fuse check:

-1. Check the following fuses.










Are the fuses OK?
-YES- The fuses are OK. Go to step 27 (relay check).
-NO- Replace the blown fuse(s).

27. Relay check:

-1. Test the following relays Testing and Inspection:
NOTE: In case the failure is not reproduced, 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 Fuel And Emissions Systems Diagnostic Interview: Engine Won't Start; Starts, Stalls Immediately; Or Is Hard to Start.
-NO- Replace the damaged relays.
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