Checks
| Action
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DEFINITION: Engine
cranks OK, but does not start for a long time. Does eventually run, or
may start but immediately dies.
|
Preliminary
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• | Inspect the powertrain control module (PCM) grounds for being
clean, tight, and in the proper locations. Refer to
Engine Controls Schematics
. |
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Sensor/System
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• | Test the engine coolant temperature (ECT) sensor for being shifted
in value. Connect a scan tool. Compare the engine coolant temperature against
the intake air temperature (IAT) on a cold engine. The
ECT and IAT sensor values should be within ± 3°C
(5°F) of each other. If the ECT sensor is out of range
with the IAT sensor, check the resistance of the ECT sensor.
Refer to
Temperature Versus Resistance
for resistance specifications. Replace the ECT sensor if
the resistance is not within the specification. If the sensor
is within the specification, repair the ECT signal circuit
for high resistance. |
• | Inspect the mass air flow (MAF) sensor installation. A MAF sensor
that is incorrectly installed may cause a hard start. Important: The embossed
arrows on the MAF sensor indicate the direction of the
intake air flow. The arrows must point toward the engine.
Install the MAF in the proper direction. Refer to
Mass Airflow Sensor/Intake Air Temperature Sensor Replacement
. |
• | Inspect the camshaft position (CMP) sensor for proper mounting
and/or a bad connection. A long crank time occurs if the PCM does not receive
a CMP signal. |
|
Fuel System
|
• | A faulty in-tank fuel pump check valve allows the fuel in the
lines to drain back to the tank after the engine stops. Refer to
Fuel System Diagnosis
. |
• | Inspect both injector fuses for being open. An open injector fuse
causes four injectors and four ignition coils not to operate. Replace the
fuse. Inspect the injector circuits and the ignition coil
circuits for an intermittent short to ground. |
|
Ignition System
|
• | Test both injector fuses for being open. An open injector fuse
causes four ignition coils and four injectors not to operate. Replace the
fuse. Inspect the ignition coil circuits and the injector
circuits for an intermittent short to ground. |
• | Remove the spark plugs and check for the following: |
Refer to
Spark Plug Inspection
in Engine Electrical.
• | Determine the cause of the fouling before replacing the spark
plugs if the spark plugs are gas, coolant, or oil fouled. Refer to
DTC P0172 or P0175
for diagnosis of the rich
condition. Refer to
Spark Plug Inspection
in Engine Electrical for diagnosis of coolant or oil fouled spark plugs. |
• | Inspect for bare or shorted ignition wires. |
|
Engine
Mechanical
|
• | Combustion chambers for excessive carbon buildup. Clean the chambers
using top engine cleaner. Follow the instructions on the can. |
• | For incorrect basic engine parts. Inspect the following: |
Refer to Engine/Engine Mechanical.
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