Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 21: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Stalls (5 Of 5)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ENGINE STALLS
Special Tools Required
Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available
NOTE:
Before beginning this troubleshooting:
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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:
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1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS.
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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.
2. Problem verification:
1. Set the HDS to record a HIGH-SPEED SNAPSHOT of following parameters for 30 seconds.
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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
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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
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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.
4. 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.
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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)
Poor connection of MAF
Additional remarks
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
1
SENSOR
MAF SENSOR:
When the MAF SENSOR pattern
matches ENGINE SPEED, the MAF
sensor is normal.
Pattern
2
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.
Pattern 2 The MAF 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 case of intermittent failure, or use the
snapshot in case of reproducible failure.
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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)
ECT SENSOR 1
Additional remarks
When ECT SENSOR 1 indicates about
176Β°F (80 Β°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
1
high
ECT SENSOR 1
Pattern
2
If actual engine temp is similar to ECT
SENSOR 1, ECT sensor 1 is normal.
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)).
6. 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.
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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)
BATTERY voltage
Additional remarks
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When the BATTERY voltage is
excessively low, the PCM or unit
stops functioning, causing engine
stall.
Pattern
1
For PCM or each unit to start
(functioning), more than 7.0 V is
needed.
low
BATTERY voltage
If the BATTERY voltage is above 12 V
when the engine stalls, the battery is
normal.
Pattern
2
normal
Which pattern is indicated?
Pattern 1 TEST THE BATTERY , 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 case of intermittent failure, or use the
snapshot in case of reproducible failure.
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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)
CKP NO PULSE counts up when
Additional remarks
When CKP NO PULSE counts
up, the PCM is not receiving
the CKP sensor signal.
Pattern
1
cranking
The CKP NO PULSE indicates the pulse is
The CKP sensor signal is OK
when the CKP NO PULSE
count does not increase.
Pattern
2
normal
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 case of intermittent failure, or use the
snapshot in case of reproducible failure.
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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
When CKP NOISE counts up, the
PCM is receiving electrical noise
along with the CKP sensor signal.
Pattern
1
CKP NOISE counts up
up
Normal when CKP NOISE does not count
The CKP sensor signal is OK when
the CKP NOISE count does not
increase.
Pattern
2
up
Which pattern is indicated?
Pattern 1 GO TO THE TROUBLESHOOTING PROCEDURE FOR DTC P0339 . Check for
after market accessories.
Pattern 2 The CKP sensor is OK. Go to step 9 (diagnosis by parameter (ST FUEL TRIM)).
9. 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.
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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
If the AF FB (ST FUEL TRIM)
value increases when the engine
stalls, there may be a lean
condition.
Pattern
1
Engine stalls while AF FB (ST FUEL TRIM) value
increases
Normal when the engine stalls when AF FB (ST
FUEL TRIM) is around 1.0 (center
The fuel trim is normal when the
engine stalled with AF FB (ST
FUEL TRIM) around 1.0 (center
value).
Pattern
2
value)
Engine stalls when AF FB (ST FUEL TRIM) is
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
3
around 0.8
Normal when the engine stalls with AF FB (ST FUEL
TRIM) is around 1.0 (center
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.
Pattern
4
value)
Which pattern is indicated?
Pattern 1 Diagnostic procedure:
1. Check fuel pump operation sound.
2. GO TO THE FUEL PRESSURE TEST .
3. GO TO THE FUEL PUMP CIRCUIT TROUBLESHOOTING .
4. TEST THE PGM-FI MAIN RELAY .
5. TEST PGM-FI MAIN RELAY 2 .
6. Check for the following fuses:
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No. A23 (15 A) fuse (in the under-hood fuse/relay box)
No. B4 (15 A) fuse (in the under-dash fuse/relay box)
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Pattern 3 Check the PCS for leaks.
Pattern 2 and 4 Go to step 10 (diagnosis by parameter (MISFIRE)).
10. 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.
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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)
Engine stalls after MISFIRE counts
Additional remarks
When engine stalls after
MISFIRE count increases, the
engine stall may be caused by
misfire.
Pattern
1
up
If the MISFIRE count remains
constant when the engine
stalls, the stall was not caused
by misfire.
Pattern
2
Normal when engine stalls with MISFIRE count
remaining constant
Which pattern is indicated?
Pattern 1 Diagnostic procedure:
1. When misfire counts up without storing misfire DTC P0300-P0304, GO TO THE DTC
P0300-P0304 TROUBLESHOOTING .
2. 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 .
Pattern 2 Go to step 11 (diagnosis by parameter (A/C CLUTCH)).
11. 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.
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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
Engine stalls when A/C is CLUTCH
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
1
ON.
Engine stalls during A/C CLUTCH is
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.
Pattern
2
OFF.
Which pattern is indicated?
Pattern 1 Diagnostic procedure:
1. Check for excessive charging of A/C refrigerant.
2. Check for charging of other gas.
3. Check for drag of the A/C compressor.
Pattern 2 Go to step 12 (diagnosis by parameter (PNP SWITCH)).
12. 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.
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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)
A/T is in-gear
Additional remarks
In-gear condition when PNP SWITCH
is "GEAR". Engine stall may be
caused by A/T. (Engine also is a
factor)
Pattern
1
condition
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.
Pattern
2
A/T is not faulty.
condition
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).
13. 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.
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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
Engine stall caused by lock
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
1
up
Lock up is normal when engine stalls
with SLIP RATIO OF TORQ OR
START CLUTCH near "0" in the
middle of deceleration.
Pattern
2
Lock up normal
normal
Which pattern is indicated?
Pattern 1 Go to the Automatic Transmission Symptom Troubleshooting Index for torque
converter clutch does not disengage.
Pattern 2 Go to step 14 (fuel system troubleshooting).
14. Fuel pressure check:
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1. Do THE FUEL PRESSURE TEST .
Is the fuel pressure OK?
YES : Go to step 15 (ignition system troubleshooting).
NO : Check for following pars:
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FUEL PUMP CIRCUIT
FUEL PRESSURE REGULATOR
Fuel filter See FUEL TANK UNIT DISASSEMBLY AND REASSEMBLY or FUEL
TANK UNIT REMOVAL AND INSTALLATION
15. Spark plug visual check:
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1. Turn the ignition switch to LOCK (0).
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2. Remove the spark plugs See FUEL TANK UNIT DISASSEMBLY AND REASSEMBLY or
FUEL TANK UNIT REMOVAL AND INSTALLATION .
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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.
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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.
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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.
16. Determine possible failure area (ignition system, others):
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1. Select the ALL INJECTORS in the INSPECTION MENU with the HDS, and disable all the
injectors.
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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.
17. Ignition coil power circuit check:
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1. Disconnect the following connector(s).
Ignition coil(s) 3P connector from the problem cylinder
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2. Remove the ignition coil relay (A) from the under-hood fuse/relay box.
Fig. 22: Identifying Ignition Coil Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
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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)
Fig. 23: Checking For Continuity Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.
18. Engine compression check:
1. DO AN ENGINE COMPRESSION INSPECTION .
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Is the engine compression OK?
YES : Go to step 19 (EVAP canister purge valve check).
NO : Check for wear or damage to these parts:
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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
19. EVAP canister purge valve check:
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1. Turn the ignition switch to LOCK (0).
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2. Disconnect the following connector.
EVAP canister purge valve 2P connector
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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.
Fig. 24: Identifying Vacuum Hose And EVAP Canister Purge Valve
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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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).
20. Fuse check:
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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).
21. Relay check:
1. TEST THE FOLLOWING RELAYS :
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NOTE:
In situations where the failure is difficult to reproduce, the following
relays may have intermittent failure.
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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 .
NO : Replace any damaged relays.
Fig. 25: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Related Problems
(1 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 26: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Related Problems
(2 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 27: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Related Problems
(3 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 28: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Related Problems
(4 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 29: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Related Problems
(5 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 30: Fuel And Emissions Systems Symptom Troubleshooting Flow Chart - Engine Related Problems
(6 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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:
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Make sure the battery is fully charged.
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
2018 Honda CR-V Owner's Manual
2015 Honda CR-V Owner's Manual
