Engine Cranks But Does Not Run. Chevrolet Chevy Suburban

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 Chevy Suburban - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Engine Cranks But Does Not Run

Description

The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that causes an engine not to start. The Engine Cranks but Does Not Run diagnostic table directs the service technician to the appropriate system diagnosis.

The Engine Cranks but Does Not Run diagnostic table assumes the following:

•	The battery is completely charged. Refer to Battery Inspection/Test in Engine Electrical.

•	The cranking speed is acceptable. Refer to Engine Cranks Slowly in Engine Electrical.

•	There is adequate fuel in the fuel tank.

Diagnostic Aids

Inspect for the following conditions:

•

Mass airflow (MAF) is compared to a calculated MAF based upon the manifold absolute pressure (MAP), throttle position (TP), and engine RPM readings. A skewed or unresponsive MAP sensor at KEY ON will cause the predicted airflow value to be inaccurate. Compare MAP and TP sensor values to that of a known good vehicle.

•	Faulty ECT sensor. Using a scan tool, compare engine coolant temperature with intake air temperature (IAT) on a completely cool engine. ECT should be within 3 °C (5 °F) of the intake air temperature.

For an intermittent condition, refer to Intermittent Conditions .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

This step determines if the ignition relay is providing the listed fuses with voltage.

This step determines if the fuel pump is operating electrically.

Step

Action

Value(s)

Yes

Did you perform A Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

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

Does the scan tool display DTC P0230, P0335, P0336, P0601, P0602, P0604, P0606, P1626, P1631 or P1683?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

Turn On the ignition, with the engine OFF.
Probe both sides of the following fuses:

•

ECM 1

•

ETC

•

INJ A

•

INJ B

Does the test lamp illuminate on at least one side of all the fuses listed?

Go to Step 4

Go to Ignition Relay Diagnosis

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 5

Go to Electronic Ignition (EI) System Diagnosis

Command the fuel pump ON with a scan tool.

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 Gage. Refer to Fuel Pressure Gage Installation and Removal .
Turn ON the ignition, with the engine OFF.
Command the fuel pump ON with a scan tool.

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

384-425 kPa

(55-62 psi)

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 P0200

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 Symptoms - Engine Mechanical and Engine Compression Test in Engine Mechanical 8.1L.