Engine Cranks But Does Not Run. Chevrolet Impala 2001

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2001 🢒 Impala 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Engine Cranks But Does Not Run

Circuit Description

Conditions that may cause a "crank but no start" symptom include a lack of the following items.

•	Fuel in the proper amount, quality, and at the proper time

•	Spark of the proper quality and at the proper time

•	Proper compression

The following table will isolate the failed system and lead to the correct diagnostic procedure.

Diagnostic Aids

Using a scan tool, compare engine coolant temperature with intake air temperature on a completely cool engine. Engine coolant temperature should be within 10°C (50°F) of intake air temperature.

Step

Action

Value(s)

Yes

Schematic Reference: Engine Controls Schematics

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

Turn ON the ignition, with the engine OFF.
With a scan tool, observe the DTC information.

Does the scan tool display DTCs P0230, P0336, P0601, or P0602?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

Attempt to start the engine.
With a scan tool, monitor the Engine RPM parameter while the engine is cranking.

Does the Engine RPM parameter display cranking RPM?

Go to Step 4

Go to Electronic Ignition (EI) System Diagnosis

Turn On the ignition, with the engine OFF.

Important: Ensure the fuses listed below are not open, before proceeding with this test.

Probe both sides of the following fuses:

•

PCM

•

Fuel Pump

•	Fuel Injectors

•	Ignition Module

Does the test lamp illuminate on both sides of all the fuses listed?

Go to Step 5

Go to Ignition Relay Diagnosis

With a scan tool, command the fuel pump ON.

Does the fuel pump turn ON?

Go to Step 6

Go to Fuel Pump Electrical Circuit Diagnosis

Turn OFF the ignition.
Install the J 34730-1A fuel pressure gauge. Refer to Fuel Pressure Gage Installation and Removal .
Turn ON the ignition, with the engine OFF.
With a scan tool, command the fuel pump ON.

Is the fuel pressure within the specified range while the fuel pump is operating?

364-405 kPa (53-59 psi) VIN K

336-375 kPa (48-54 psi) VIN 1

Go to Step 7

Go to Fuel System Diagnosis

Turn OFF the ignition.
Disconnect an injector connector.
Install the J 34730-405 injector test lamp to the injector connector.
Attempt to start the engine.

Does the test lamp blink while the engine is cranking?

Go to Step 8

Go to DTC P0201, P0202, P0203, P0204, P0205, or P0206

Turn OFF the ignition.
Disconnect a spark plug wire.
Install the J 26792 spark tester to the spark plug wire.
Attempt to start the engine.

Does the spark tester spark?

Go to Step 9

Go to Electronic Ignition (EI) System Diagnosis

Inspect for the following conditions:

•	Collapsed air intake duct

•	Restricted air filter element. Refer to Air Cleaner Element Replacement .

•	Spark plugs for being gas or coolant fouled. Refer to Spark Plug Inspection . If the spark plugs are fouled, determine what caused the condition.

•	Engine mechanical condition (worn timing chain and gears, low compression, etc.). Refer to Engine Compression Test in Engine Mechanical.

•	Restricted exhaust system. Refer to Restricted Exhaust in Engine Exhaust.

•	The engine coolant temperature (ECT) sensor is NOT close to the actual engine temperature.

•	Compare MAP/BARO parameters to another vehicle. The parameters should be close in value. Refer to Manifold Absolute Pressure Sensor Diagnosis .

•	TP sensor for being stuck in range.

Did you find and correct the condition?

Go to Step 10

Go to Diagnostic Aids

With a scan tool, clear the DTCs.
Attempt to start the engine.

Does the engine start and continue to operate?

Go to Step 11

Go to Step 2

Idle the engine.
Allow the engine to reach operating temperature.
With a scan tool, observe the DTC information.

Are any DTCs displayed?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 12

With a scan tool review the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK