GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 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 prevents an engine from starting. 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.

Step

Action

Value(s)

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views

1

Did you perform the Diagnostic System Check-Engine Controls?

--

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the DTC information with a scan tool.

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

--

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

3

Does the scan tool display any body control module (BCM) vehicle theft deterrent (VTD) DTCs?

--

Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent

Go to Step 4

4

Probe both sides of the following fuses with a test lamp that is connected to a good ground:

    • ECM 1
    • INJ A
    • INJ B

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

--

Go to Step 5

Go to Ignition Relay Diagnosis

5
  1. Attempt to start the engine.
  2. Observe the Engine Speed parameter with a scan tool, while the engine is cranking.

Does the engine speed increment?

--

Go to Step 6

Go to Distributor Ignition (DI) System Diagnosis

6

Monitor the Ignition 1 Signal Voltage parameter with a scan tool.

Is the Ignition 1 Signal Voltage parameter at the specified value?

B+

Go to Step 7

Go to Step 11

7

Command the fuel pump ON with a scan tool.

Does the fuel pump turn ON?

--

Go to Step 8

Go to Fuel Pump Electrical Circuit Diagnosis

8
  1. Turn OFF the ignition.
  2. Disconnect a spark plug wire.
  3. Install the J 26792 spark tester to the spark plug wire.
  4. Attempt to start the engine.

Does the spark tester spark?

--

Go to Step 9

Go to Distributor Ignition (DI) System Diagnosis

9
  1. Turn OFF the ignition.
  2. Install the J 34730-1A fuel pressure gage . Refer to Fuel System Diagnosis .
  3. Turn ON the ignition, with the engine OFF.
  4. Command the fuel pump ON with a scan tool.

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

379-427 kPa

(55-62 psi)

Go to Step 10

Go to Fuel System Diagnosis

10

Inspect for the following conditions:

    • A collapsed air intake duct
    • A restricted air filter element--Refer to Air Cleaner Element Replacement .
    • The spark plugs for being gas or coolant fouled--Refer to Spark Plug Inspection . If the spark plugs are fouled, determine what caused the condition.
    • Any engine mechanical condition, such as a worn timing chain, gears and low compression--Refer to Symptoms - Engine Mechanical in Engine Mechanical 4.3L.
    • A 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 P0125 .
    • Compare manifold absolute pressure/barometric pressure (MAP/BARO) parameters to another vehicle. The parameters should be close in value. Refer to DTC P0106 .
    • The throttle position (TP) sensor for being stuck in range--Refer to DTC P0121 .

Did you find complete the action?

--

Go to Step 14

--

11
  1. Test the ignition 1 signal voltage circuit for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  2. Replace the fuse if necessary.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 12

12

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 13

13

Replace the PCM. Refer to Powertrain Control Module Replacement .

Did you complete the replacement?

--

Go to Step 14

--

14
  1. Clear the DTCs with a scan tool.
  2. Attempt to start the engine.

Does the engine start and continue to operate?

--

Go to Step 15

Go to Step 2

15
  1. Idle the engine.
  2. Allow the engine to reach operating temperature.
  3. Observe the DTC information with a scan tool.

Are any DTCs displayed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK