NO.5 ENGINE STALLS-AFTER START/AT IDLE [L3]

BME010300000W07

5

ENGINE STALLS-AFTER START/AT IDLE

DESCRIPTION

• Engine stops unexpectedly.

POSSIBLE CAUSE

• A/C system operation is improper
• Air leakage from intake-air system parts
• Purge solenoid valve malfunction
• Improper operation of IAC valve
• EGR valve malfunction
• No signal from CKP sensor due to sensor, related wire or wrong installation
• Vacuum leakage
• Engine overheating
• Low engine compression
• Spark leakage from high-tension leads
• Poor fuel quality
• PCV valve malfunction
• Air cleaner restriction
• Restriction in exhaust system
• Electrical connector disconnection
• Open or short circuit in fuel pump body and related harness
• No battery power supply to PCM or poor GND
• Inadequate fuel pressure
• Fuel pump body mechanical malfunction
• Fuel leakage from fuel injector
• Fuel injector clogging
• Ignition coil malfunction
• Improper air/fuel mixture ratio control
• Improper valve timing
• Immobilizer system and/or circuit malfunction (if equipped)
• Pressure regulator 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
(See BEFORE REPAIR PROCEDURE [L3].)
(See AFTER REPAIR PROCEDURE [L3].)
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

1
Note
• The following test should be performed for vehicles with immobilizer system. Go to Step 12 for vehicles without immobilizer system.
Connect WDS or equivalent to DLC-2.
Do following conditions appear?
• Engine is not completely started.
• DTC P1624 is displayed.
Yes

Both conditions appear:

Go to Step 4.
No

Either or other condition appears:

Go to next step.
2
Does engine stall after approx. 2 seconds since engine is started?
Yes
Go to next step.
No
immobilizer system is okay.
Go to Step 12.
3
Is immobilizer unit connector securely connected to immobilizer unit?
Yes
Go to next step.
No
Connect immobilizer unit connector securely.
Return to Step 2.
4
Does immobilizer indicator light flash and indicate any of following immobilizer system DTC's?
DTC

01, 02, 03, 11, 21

Yes
Go to "ON-BOARD DIAGNOSTIC FUNCTION" of immobilizer system.
No
Go to next step.
5
Does security light illuminate?
Yes
Go to Step 8.
No
Go to next step.
6
Does security light flash and indicate any of following immobilizer system DTCs more than 135 seconds after ignition switch is turned to ON?
DTC

24, 30

Yes
Go to "ON-BOARD DIAGNOSTIC FUNCTION" of immobilizer system.
No
Go to next step.
7
Turn ignition switch off.
Disconnect immobilizer unit connector.
Connect jumper wire between immobilizer unit connector terminal M and GND.
Turn ignition switch to ON position.
Does security light illuminate?
Yes
Reconnect immobilizer unit connector.
Go to next step.
No
Inspect for open circuit between immobilizer unit connector terminal M and instrument cluster.
If okay, inspect security light bulb. Repair or replace if necessary. Reconnect immobilizer unit connector, then return to step 4.
8
Connect WDS or equivalent to DLC-2 and retrieve DTC.
Are any of following DTCs displayed?
DTC

P1602, P1603, P1604, P1621, P1622, P1624

Yes
Go to appropriate DTC test.
No
Go to next step.
9
Is there continuity between PCM GND terminals 4A, 4B, 4C and GND?
Yes
Go to next step.
No
Repair or replace wiring harness.
10
Turn ignition switch to ON position.
Access VPWR PID.
Is VPWR PID okay?
VPWR PID

Battery voltage

Yes
Go to next step.
No
Repair or replace wiring harness.
11
Disconnect coil connector.
Turn ignition switch to ON position.
Is there battery voltage at immobilizer unit connector terminal J?
Yes
Inspect for open circuit between PCM connector terminal 2Q and immobilizer unit connector terminal A.
No
Repair or replace wiring harness between immobilizer unit connector terminal J and fuse panel.
12
Verify following:
• Vacuum connection
• Air cleaner element
• 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, IAC valve
• Ignition wiring
• Fuel quality: proper octane, contamination, winter/summer blend
• Electrical connections
• Smooth operation of throttle valve
Are all items okay?
Yes
Go to next step.
No
Service as necessary.
Repeat Step 12.
13
Turn ignition switch to ON position.
Disconnect TP sensor connector.
Measure voltage at TP sensor connector VREF terminal with ignition switch ON.
Voltage

4.5-5.5 V

Is voltage okay?
Yes
Go to next step.
No
Go to troubleshooting "No.27 Constant voltage".
14
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs.
If engine stalls, retrieve continuous memory and KOEO DTCs.
Are there any DTC displayed?
Yes

DTC is displayed:

Go to appropriate DTC test.

Communication error message is displayed:

Inspect for following:
• Open circuit between main relay and PCM terminal 2Y
• Open main relay GND circuit
• Main relay is stuck open.
• Open or poor GND circuit (PCM terminal 4X, 2AB or 2AC)
• Poor connection of vehicle body GND
No

No DTC is displayed:

Go to next step.
15
Attempt to start engine at part throttle.
Does engine run smoothly at part throttle?
Yes
Inspect IAC valve and wiring harness.
No
Go to next step.
16
Connect WDS or equivalent to DLC-2.
Access RPM PID.
Is RPM PID indicating engine speed during engine cranking?
Yes
Go to next step.
No
Inspect for following:
• Open or short circuit in CKP sensor
• Open or short circuit between CKP sensor and PCM terminal 2G or 2D
• Open or short circuit in CKP sensor harnesses
If CKP sensor and harness are okay, go to next step.
17
Visually inspect CKP sensor and teeth of crankshaft pulley.
Are CKP sensor and teeth of crankshaft pulley okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
18
Measure gap between CKP sensor and teeth of crankshaft pulley.
Specification

0.5-1.9 mm {0.020-0.075 in}

Is gap within specification?
Yes
Go to next step.
No
Adjust CKP sensor.
19
Inspect for cracks on high-tension leads.
Are there any cracks on high-tension leads?
Yes
Repair suspected high-tension leads.
No
Go to next step.
20
Is strong blue spark visible at each disconnected high-tension lead while cranking engine?
Yes
Go to next step.
If symptom occurs with A/C on, go to Step 24.
No
Inspect for following:
• Open or short circuit in ignition coil
• Open circuit in high-tension leads
• Open circuit between ignition coil connector GND terminal and body GND
• Open circuit between ignition switch and ignition coil
• Open circuit between ignition coil and PCM terminal 1A or 1B
21
Inspect spark plug condition.
Is 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.
No
Install spark plugs on original cylinders.
Go to next step.
22
Remove and shake PCV valve.
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
23
Inspect for restriction in the exhaust system.
Is there any restriction?
Yes
Inspect exhaust system.
No
Go to next step.
24
Install fuel pressure gauge between fuel pipe and fuel distributor.
Connect jumper wire between F/P terminal at DLC-2 in engine compartment and GND.
Turn ignition switch to ON position.
Is fuel line pressure correct with ignition switch ON?
Yes
Go to next step.
No

Zero or low:

Inspect for clogged fuel line.
If okay, replace fuel pump unit.

High:

Replace fuel pump unit.
25
Visually inspect for fuel leakage at fuel injector O-ring and fuel line. Service as necessary.
Is fuel line pressure held after ignition switch is turned off?
Yes
Go to next step.
No
Inspect fuel injector.
If fuel injector is okay, replace fuel pump unit.
26
Note
• Following test is for stall concerns with A/C on. If other symptoms exist, go to next step.
Connect pressure gauges to A/C low and high pressure side lines.
Turn A/C on and measure low side and high side pressures.
Are pressures within specifications?
Yes
Go to next step.
No
If A/C is always on, go to symptom troubleshooting "No.24 A/C is always on or A/C compressor runs continuously".
For other symptoms, inspect following:
• Refrigerant charging amount
• Condenser fan operation
27
Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid side.
Plug opening end of vacuum hose.
Start engine.
Is engine stall now eliminated?
Yes
Inspect if purge solenoid valve sticks open.
Inspect evaporative emission control system.
No
Go to next step.
28
Is air leakage felt or heard at intake-air system components while racing engine to higher speed?
Yes
Repair or replace.
No
Go to next step.
29
Inspect engine condition while tapping EGR valve housing.
Does engine condition improve?
Yes
Replace EGR valve.
No
Go to next step.
30
Is engine compression correct?
Yes
Inspect valve timing.
No
Inspect for cause.
31
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.