Engine Cranks But Does Not Run. GMC Truck GMC C Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC C Sierra - 2WD 🢒 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 within specifications. Refer to Engine Cranks Slowly in Engine Electrical.

•	There is adequate fuel in the fuel tank.

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.
With a scan tool, observe the DTC information.

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

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

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:

•

ECM 1

•

INJ A

•

INJ B

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

Go to Step 4

Go to Ignition Relay Diagnosis

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

Does the engine speed increment?

Go to Step 5

Go to Distributor Ignition (DI) System 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 System Diagnosis .
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?

414-455 kPa

(60-66 psi)

Go to Step 7

Go to Fuel System 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 8

Go to Distributor Ignition (DI) 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, gears and low compression)--Refer to Symptoms - Engine Mechanical 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--Refer to DTC P0117 or DTC P0118 .

•	Compare manifold absolute pressure/barometric pressure (MAP/BARO) parameters to another vehicle. The parameters should be close in value. Refer to DTC P0106 .

•	Throttle pressure (TP) sensor for being stuck in range. Refer to DTC P0121 .

Did you find and correct the condition?

Go to Step 9

Go to Intermittent Conditions

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

Does the engine start and continue to operate?

Go to Step 10

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 11

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