Engine stalls

Special Tools Required 

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

NOTE: 

• Before beginning this troubleshooting, do a customer diagnostic interview - Refer to: Fuel and Emissions Systems Symptom Troubleshooting - Engine stalls-Diagnostic interview 
• • When the symptom cannot be duplicated, you can do the troubleshooting using the on-board snapshot information in this procedure. Refer to the diagnostic interview (date, place) and the present total mileage, and compare the total mileage which is estimated from the interview when a failure occurred and the parameter (total mileage) in the on-board snapshot information. Make sure the date when the failure occurred corresponds with the date on which the on-board snapshot information was recorded. If it doesn't, the on-board snapshot information cannot be used in this troubleshooting.
• 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.
• After the troubleshooting, reset the PCM with the HDS to erase the on-board snapshot information recorded on the PCM.

1. DTC check

   - 1. Turn the vehicle to the ON mode.

   - 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 PGM-FI system, go to the PCM power and ground circuit troubleshooting - Refer to: PCM Power and Ground Circuit Troubleshooting (2014 2015), or PCM Power and Ground Circuit Troubleshooting (2016), or PCM Power and Ground Circuit Troubleshooting (2017 2018 2019 2020) .

2. Problem verification

   - 1. Set the HDS to record a 30 second manual trigger SNAPSHOT with the trigger in the middle. Trigger when the engine stalls.

   • ENGINE SPEED
   • MAF SENSOR
   • ECT SENSOR 1
   • BATTERY
   • CKP NO PULSE
   • CKP NOISE
   • FUEL PRESSURE CONVERTED FROM PF SENSOR
   • FUEL PRESSURE DIRECT INJECTION SYSTEM
   • ST FUEL TRIM B1
   • ST FUEL TRIM B2
   • EVAP PC DUTY
   • MISFIRE
   • EGR valve position sensor (EGR VLS)
   • A/C CLUTCH
   • PNP SWITCH
   • SLIP RATIO OF TORQ OR STARTCLUTCH

   Data List

   - 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.

3. On-board snapshot check

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

   On-board Snapshot

   Is there an Engine Stall 2 record in the on-board snapshot?

   YES 

   Go to step 4 (diagnosis by parameter (MAF SENSOR)).

   NO 

   Go to step 16 (fuel system troubleshooting).

   NOTE:  If an engine stall on-board snapshot was not found, the snapshot may have been lost due to low battery voltage or because of battery disconnection or replacement.

4. On-board snapshot check (MAF SENSOR):

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

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

   On-board Snapshot

   - 2. Select the MAF SENSOR and ENGINE SPEED in the configuration list.

   Check the recorded snapshot or on-board snapshot parameters at the time 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 Courtesy of HONDA, U.S.A., INC.	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 Courtesy of HONDA, U.S.A., INC.	When the MAF SENSOR pattern matches ENGINE SPEED, the MAF sensor is normal.

   Which pattern is indicated?

   Pattern 1

   Check the MAF sensor/IAT sensor for loose terminals or poor connections. If the terminals and connections are OK, substitute a known-good MAF sensor/IAT sensor .

   Pattern 2

   The MAF sensor/IAT sensor is OK. Go to step 5 (diagnosis by parameter (ECT SENSOR 1)).

5. On-board snapshot check (ECT SENSOR 1):

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

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

   On-board Snapshot

   - 2. Select ECT SENSOR 1 and ENGINE SPEED in the configuration list.

   Check the recorded snapshot or on-board snapshot parameters at the time 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 Courtesy of HONDA, U.S.A., INC.	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 Courtesy of HONDA, U.S.A., INC.	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 a failure in ECT sensor 1.

   Pattern 2

   ECT sensor 1 is OK. Go to step 6 (diagnosis by parameter (BATTERY)).

6. On-board snapshot check (BATTERY):

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

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

   On-board Snapshot

   - 2. Select the BATTERY and ENGINE SPEED in the configuration list.

   Check the recorded snapshot or on-board snapshot parameters at the time 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 Courtesy of HONDA, U.S.A., INC.	When the BATTERY voltage is excessively low, the PCM or control unit stops functioning, causing engine stall. For PCM or each control unit to start (functioning), more than 7.0 V is needed.
   Pattern 2	BATTERY voltage normal Courtesy of HONDA, U.S.A., INC.	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 - Refer to: Battery Test (2016 2017 2018 2019 2020), or Battery Test (2014 2015) , and check the battery cables and terminals.

   Pattern 2

   The battery is OK. Go to step 7 (diagnosis by parameter (CKP NO PULSE)).

7. On-board snapshot check (CKP NO PULSE):

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

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

   On-board Snapshot

   - 2. Select the CKP NO PULSE and ENGINE SPEED in the configuration list.

   Check the recorded snapshot or on-board snapshot parameters at the time 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	Count is continuously up Courtesy of HONDA, U.S.A., INC.	When CKP NO PULSE counts go up, the PCM is not receiving the CKP sensor signal.
   Pattern 2	Count is continuously not up Courtesy of HONDA, U.S.A., INC.

   Which pattern is indicated?

   Pattern 1

   Do the troubleshooting procedure for DTC P0335 .

   Pattern 2

   Go to step 8 (diagnosis by parameter (CKP NOISE)).

8. On-board snapshot check (CKP NOISE):

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

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

   On-board Snapshot

   - 2. Select the CKP NOISE and ENGINE SPEED in the configuration list.

   Check the recorded snapshot or on-board snapshot parameters at the time of 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	Count is continuously up Courtesy of HONDA, U.S.A., INC.	When CKP NOISE counts go up, the PCM is receiving electrical noise along with the CKP sensor signal.
   Pattern 2	Count is continuously not up Courtesy of HONDA, U.S.A., INC.

   Which pattern is indicated?

   Pattern 1

   Go to the troubleshooting procedure for DTC P0339 .

   Pattern 2

   The CKP sensor is OK. Go to step 9 (FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM)).

9. On-board snapshot or snapshot check (FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM):

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

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

   On-board Snapshot

   - 2. Select the FUEL PRESSURE CONVERTED FROM PF SENSOR, FUEL PRESSURE DIRECT INJECTION SYSTEM, and ENGINE SPEED in the configuration list.

   Check the recorded snapshot or on-board snapshot parameters at the time of the engine stall, then compare the FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM patterns from these charts, and determine the problem.

   Pattern	Symptom (Diagnosis by parameter)	Additional remarks
   Pattern 1	FUEL PRESSURE CONVERTED FROM PF SENSOR drops to almost 0 kPa before engine stalls Courtesy of HONDA, U.S.A., INC.	If the FUEL PRESSURE CONVERTED FROM PF SENSOR drops to almost 0 kPa before engine stall, the engine stall may be caused by low fuel pressure. Fuel leak, out of fuel Fuel rail pressure sensor failure Spill valve stuck off Fuel pressure regulator (low pressure side) Fuel pump (low pressure side) High pressure fuel pump
   Pattern 2	Normal when the FUEL PRESSURE CONVERTED FROM PF SENSOR is nearly the same as the FUEL PRESSURE DIRECT INJECTION SYSTEM. Courtesy of HONDA, U.S.A., INC.	If the FUEL PRESSURE CONVERTED FROM PF SENSOR is nearly the same as the FUEL PRESSURE DIRECT INJECTION SYSTEM when engine stalls, the fuel pressure is normal.

   Which pattern is indicated?

   Pattern 1

   Do the troubleshooting procedure for DTC P0087 .

   Pattern 2

   The fuel pressure is OK. Go to step 10 (diagnosis by parameter (ST FUEL TRIM (B1, B2))).

10. On-board snapshot check (ST FUEL TRIM (B1, B2)):

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

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

    On-board Snapshot

    - 2. Select the ST FUEL TRIM (B1, B2), EVAP PC DUTY, and ENGINE SPEED in the configuration list.

    Check the recorded snapshot or on-board snapshot parameters at the time of the engine stall, then compare the ST FUEL TRIM (B1, B2) pattern from the charts, and determine the problem.

    Pattern	Symptom (Diagnosis by parameter)	Additional remarks
    Pattern 1	Engine stalls while ST FUEL TRIM (B1, B2) value increases Courtesy of HONDA, U.S.A., INC.	If the ST FUEL TRIM (B1, B2) value increases when the engine stalls, there may be a lean condition or low fuel pressure.
    Pattern 2	Normal when the engine stalls when ST FUEL TRIM (B1, B2) is around 1.0 (center value) Courtesy of HONDA, U.S.A., INC.	The fuel trim is normal when the engine stalled with ST FUEL TRIM (B1, B2) around 1.0 (center value).
    Pattern 3	Engine stalls when ST FUEL TRIM (B1, B2) is around 0.8 Courtesy of HONDA, U.S.A., INC.	When the value of ST FUEL TRIM (B1, B2) is around 0.8, the PCM commands the purge control solenoid (PCS) to close (closed when EVAP PC DUTY is 0 %). If the ST FUEL TRIM (B1, B2) does not move toward 1.0, the PCS may be leaking.

    Pattern	Symptom (Diagnosis by parameter)	Additional remarks
    Pattern 4	Normal when the engine stalls with ST FUEL TRIM (B1, B2) is around 1.0 (center value) Courtesy of HONDA, U.S.A., INC.	When the value of ST FUEL TRIM (B1, B2) is around 0.8, the PCM commands the purge control solenoid (PCS) to close (closed when EVAP PC DUTY is 0 %). If the ST FUEL TRIM (B1, B2) moves toward 1.0, the PCS is not leaking.

    Which pattern is indicated?

    1. Pattern 1

       Diagnostic procedure.

       • 1.

         Check the fuel pump operation sound.

       • 2.

         Go to the fuel pressure test .

       • 3.

         Go to DTC P0627 for the fuel pump circuit troubleshooting .

       • 4.

         Test PGM-FI main relay 1 - Refer to: Power Relay Test (2016 2017 2018 2019 2020), or Power Relay Test (2014 2015) .

       • 5.

         Test PGM-FI main relay 2 - Refer to: Power Relay Test (2014 2015), or Power Relay Test (2016 2017 2018 2019 2020) .

       • 6.

         Check for the following fuses:

       • • No. C10 (15 A) fuse (in the under-hood fuse/relay box)
         • No. D21 (20 A) fuse (in the driver's under-dash fuse/relay box)

       Pattern 3

       Check the PCS for leaks.

       Pattern 2 and 4

       Go to step 11 (diagnosis by parameter (MISFIRE)).

11. On-board snapshot check (MISFIRE):

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

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

    On-board Snapshot

    - 2. Select the MISFIRE and ENGINE SPEED in the configuration list.

    Check the recorded snapshot or on-board snapshot parameters at the time of the engine stall, then compare those snapshots to the MISFIRE pattern from the charts, and determine the problem.

    Pattern	Symptom (Diagnosis by parameter)	Additional remarks
    Pattern 1	Engine stalls after MISFIRE counts go up Courtesy of HONDA, U.S.A., INC.	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 Courtesy of HONDA, U.S.A., INC.	If the MISFIRE count remains steady when the engine stalls, the stall was not caused by misfire.

    Which pattern is indicated?

    Pattern 1

    Diagnostic procedure.

    • 1.

      If misfire counts go up without storing misfire DTC P0300 - P0306, go to DTC P0300 - P0306 troubleshooting .

    • 2.

      If the misfire count reaches the malfunction threshold, DTC P0300 - P0306 is stored. Go to DTC P0300 - P0306 troubleshooting .

    Pattern 2 (Reproducible failure)

    Go to step 12 (diagnosis by parameter (EGR valve position sensor (EGR VLS))).

    Pattern 2 (Intermittent failure)

    Go to step 13 (diagnosis by parameter (A/C CLUTCH)).

12. On-board snapshot check (EGR valve position sensor (EGR VLS)):

    NOTE:  Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a 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 EGR valve position sensor (EGR VLS) and ENGINE SPEED in the configuration list.

    Check the recorded snapshot or on-board snapshot parameters at the time of engine stall, then compare the EGR valve position sensor (EGR VLS) pattern from the charts, and determine the problem.

    Pattern	Symptom (Diagnosis by parameter)	Additional remarks
    Pattern 1	EGR valve position sensor (EGR VLS) is 1.3 V or more Courtesy of HONDA, U.S.A., INC.	If the EGR valve position sensor (EGR VLS) voltage is about 1.3 V or more when the engine stalls, the EGR valve may be stuck open.
    Pattern 2	EGR valve position sensor (EGR VLS) indicates the EGR is normal Courtesy of HONDA, U.S.A., INC.	The EGR valve position sensor (EGR VLS) voltage should be less than 1.3 V.

    Which pattern is indicated?

    Pattern 1

    Loosen the EGR valve mounting bolts , then install a metal plate between the EGR valve and the engine to block the EGR port, and recheck. If it is OK, replace the EGR valve .

    Pattern 2

    The EGR valve is OK. Go to step 13 (diagnosis by parameter (A/C CLUTCH)).

13. On-board snapshot check (A/C CLUTCH):

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

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

    On-board Snapshot

    - 2. Select the A/C CLUTCH and ENGINE SPEED in the configuration list.

    Check the recorded snapshot or on-board snapshot parameters at the time 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 CLUTCH is ON. Courtesy of HONDA, U.S.A., INC.	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. Courtesy of HONDA, U.S.A., INC.	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.

    • 1.

      Check for over-charge A/C refrigerant.

    • 2.

      Check for charging with the wrong refrigerant.

    • 3.

      Check for drag of the A/C compressor and A/C compressor clutch.

    Pattern 2

    Go to step 14 (diagnosis by parameter (PNP SWITCH)).

14. On-board snapshot check (PNP SWITCH):

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

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

    On-board Snapshot

    - 2. Select the PNP SWITCH and ENGINE SPEED in the configuration list.

    Check the recorded snapshot or on-board snapshot parameters at the time 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 Courtesy of HONDA, U.S.A., INC.	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 Courtesy of HONDA, U.S.A., INC.	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 15 (diagnosis by parameter (SLIP RATIO OF TORQ OR STARTCLUTCH)).

    Pattern 2

    Go to step 16 (fuel system troubleshooting).

15. On-board snapshot check (SLIP RATIO OF TORQ OR STARTCLUTCH):

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

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

    On-board Snapshot

    - 2. Select the SLIP RATIO OF TORQ OR STARTCLUTCH, ENGINE SPEED, and VEHICLE SPEED in the configuration list.

    Check the recorded snapshot or on-board snapshot parameters at the time of the engine stall, then compare the SLIP RATIO OF TORQ OR STARTCLUTCH pattern from the charts, and determine the problem.

    Pattern	Symptom (diagnosis by parameter)	Additional remarks
    Pattern 1	Engine stall caused by lock up Courtesy of HONDA, U.S.A., INC.	When engine stalls, SLIP RATIO OF TORQ OR STARTCLUTCH is near 100 % from deceleration to stopping, the engine stall is caused by lock up.
    Pattern 2	Lock up normal Courtesy of HONDA, U.S.A., INC.	Lock up is normal when engine stalls with SLIP RATIO OF TORQ OR STARTCLUTCH near "0" in the middle of deceleration.

    Which pattern is indicated?

    Pattern 1

    Go to the automatic transmission systems symptom troubleshooting index for torque converter clutch does not disengage - Refer to: Automatic Transmission Symptom Troubleshooting Index (2014 2015), or A/T System Symptom Troubleshooting Index (2016 2017 2018 2019 2020) .

    Pattern 2

    Go to step 16 (fuel system troubleshooting).

16. Fuel pressure check

    - 1. Do the fuel pressure test.

    Is the fuel pressure OK?

    YES 

    Go to step 17 (ignition system troubleshooting).

    NO 

    Check for following parts:?

    • Go to the fuel pump circuit troubleshooting procedure for DTC P0627 .
    • Fuel pressure regulator
    • Fuel filter
17. Spark plug visual check

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Remove the spark plugs.

    - 3. Check the condition of the spark plug electrodes.

    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?

    1. YES (wet)

       Check the following conditions. If those conditions do not apply, go to step 18.

       • 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 18.

18. Determine possible failure area (ignition system, others)

    - 1. Select the ALL INJECTORS in the INSPECTION MENU with the HDS, and stop fuel injection operation.

    ALL INJECTORS

    Turn the vehicle to the OFF (LOCK) mode.

    - 3. Fit a spark plug to the ignition coil and ground it to the engine.

    - 4. Crank the engine and watch for spark at the spark plugs.

    Does it have sparkΩ

    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 20 (engine compression troubleshooting).

    NO 

    Go to step 19.

19. Ignition coil power circuit check

    - 1. Disconnect the following connector (s).

    Ignition coil 3P connector (problem cylinder)

    - 2. Turn the vehicle to the ON mode.

    - 3. Measure the voltage between test points 1 and 2.

    Test condition	Vehicle ON mode
    	Ignition coil 3P connector (problem cylinder): disconnected
    Test circuit	IG (IGN COIL)
    Test point 1	Ignition coil 3P connector No. 1 (RED)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The ignition coil power circuit is OK. Replace the ignition coil (s) .

    NO 

    Repair the ignition coil power circuit.

20. Engine compression check

    - 1. Do an engine compression inspection.

    Is the engine compression OK?

    YES 

    Go to step 21 (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
21. EVAP canister purge valve check

    - 1. Turn the vehicle to the OFF (LOCK) mode.

    - 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 the vacuum pump/gauge, 0 - 30 inHg, to the purge line.

    Courtesy of HONDA, U.S.A., INC.

    - 4. Start the engine.

    Does the vacuum gauge indicate vacuum?

    YES 

    When the climate is warm, fuel vapors from the fuel tank stored in the canister enter the intake manifold, enriching the mixture (excessively rich), causing the engine to stall in some cases. If needed, replace the EVAP canister purge valve .

    NO (Reproducible failure)

    Go to step 22 (fuse check).

    NO (Intermittent failure)

    Go to step 23 (relay check).

22. Fuse check

    - 1. Check the following fuses.

    Fuse	No. C8 (15 A) to the PGM-FI subrelay
    Fuse	No. C10 (15 A) to PGM-FI main relay 1
    Fuse	No. C11 (15 A) to the ignition coil relay
    Fuse	No. C14 (20 A) to the injector relay
    Location	Under-hood fuse/relay box

    Fuse	No. D21 (20 A) to PGM-FI main relay 2
    Location	Driver's under-dash fuse/relay box

    Are the fuses OK?

    YES 

    The fuses are OK. Go to step 23 (relay check).

    NO 

    Replace the blown fuse (s).

23. Relay check

    - 1. Test the following relays:

    NOTE:  In situations where the failure is difficult to reproduce, the following relays may have an intermittent failure.

    • PGM-FI main relay 1
    • PGM-FI main relay 2
    • PGM-FI subrelay
    • Ignition coil relay
    • Injector relay

    Are the relays OK?

    YES 

    Go to the diagnostic interview - Refer to: Fuel and Emissions Systems Symptom Troubleshooting - Engine stalls-Diagnostic interview 

    NO 

    Replace any defective relays.