GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 CTS - RHD 🢒 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 engine speed is acceptable. 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.

  1. The engine control module (ECM) ground is located on the mounting bracket the ECM attaches to. All ground connections should be tight and free of any corrosion. This step determines if the ECM is being grounded properly.

    2.

  2. This step determines if the battery is being grounded properly. All ground connections should be tight and free of any corrosion.

Step

Action

Values

Yes

No

Schematic Reference: Engine Controls Schematics

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

Is DTC P0201-P0206, P0261, P0264, P0267, P0270, P0273, P0276, P0335, P1629, P1630, P1631 or P2105 set?

--

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

3

Test the ground circuits of the engine control module (ECM) for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 4

4

Test the ground circuit between the battery and the body for high resistance or for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 5

5

Observe the ECM in VTD fail enable status parameter with a scan tool.

Does the scan tool display an ECM in VTD fail enable status of NO?

--

Go to Step 6

Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent

6

Important: Inspect the fuel system for damage or external leaks before proceeding with this diagnostic.

  1. Turn ON the ignition, with the engine OFF.
  2. Command the fuel pump relay ON with a scan tool.

Does the fuel pump operate?

--

Go to Step 7

Go to Fuel Pump Electrical Circuit Diagnosis

7
  1. Turn OFF the ignition.
  2. Remove the coil pack from the engine. Refer to Ignition Coil Replacement - Bank 1 or Ignition Coil Replacement - Bank 2 .
  3. Leave the electrical connector connected.
  4. Disconnect the fuel injector harness multi-connector.
  5. Install a J 26792 Spark Tester into one coil and connect it to a good ground.
  6. Turn ON the ignition, with the engine OFF.
  7. Operate the ignition coil with a scan tool.
  8. Repeat the above steps for the remaining coils.

Does the spark tester show spark on all cylinders?

--

Go to Step 8

Go to Electronic Ignition (EI) System Diagnosis

8
  1. Turn OFF the ignition.
  2. Install a fuel pressure gage. Refer to Fuel Pressure Gage Installation and Removal .
  3. Turn ON the ignition, with the engine OFF.

    4. Important: It may be necessary to command the fuel pump ON a few times in order to obtain the highest possible fuel pressure.

  4. Command the fuel pump ON with a scan tool.
  5. Observe the fuel pressure gage, with the fuel pump commanded ON.

Is the fuel pressure within the specified range?

337-379 kPa (49-55 psi)

Go to Step 9

Go to Fuel System Diagnosis

9

Inspect for the following conditions:

    • Fouled spark plugs--Refer to Spark Plug Inspection . If the spark plugs are fouled, determine the cause of the fouling before replacing them.
    • Water or alcohol contaminated fuel--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • A restricted exhaust--Refer to Restricted Exhaust .
    • An engine mechanical condition that would cause the engine not to start, such as low compression, broken timing belt, bent or burned intake or exhaust valves--Refer to Engine Compression Test in Engine Mechanical.
    • A Collapsed or leaking air intake duct
    • A skewed engine coolant temperature (ECT)

Did you find and correct the condition?

--

Go to Step 10

Go to Intermittent Conditions

10
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Attempt to start the engine.

Does the engine start and continue to run?

--

Go to Step 11

Go to Step 2

11
  1. Allow the engine to reach operating temperature.
  2. Observe the DTC information with a scan tool.

Are there any DTCs that have not been diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK