Circuit/System Verification

NOTE: This diagnostic assumes the following:

The battery is completely charged. Refer to Battery Inspection/Test (Solstice) or Battery Inspection/Test (SKY) .
The engine cranking speed is acceptable. Refer to Engine Cranks Slowly .
There is adequate fuel in the fuel tank.

Crank the engine for 15 seconds. Observe the DTC information with a scan tool. The following DTCs should not be set:
DTC P0201-P0204, P0335, P0336, P0601, P0602, P0603, P0604, P0605, P0606, P0627, P0685, P064D, P0686, P0687, P0689, P0690
- If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the VTD Fuel Enabled parameter with a scan tool. The parameter should display Yes.
- If No is displayed, refer to Diagnostic Starting Point - Immobilizer .
Ignition ON, command the fuel pump ON with a scan tool. You should hear the fuel pump turn ON.
- If the fuel pump does not turn ON, refer to Fuel Pump Electrical Circuit Diagnosis .
Ignition OFF, disconnect the fuel pump relay.
Disconnect an ignition coil from a cylinder.
Connect a J 26792 (SA91992): Spark Tester to the boot of an ignition coil of a cylinder and ground.

NOTE: An erratic or weak spark is considered a no spark condition.

While cranking the engine, verify that the spark tester sparks.
- If there is no spark, refer to Electronic Ignition System Diagnosis .
Ignition OFF, install the fuel pump relay.
Install the CH 48027-100: Pressure Gage. Refer to Fuel Pressure Gage Installation and Removal (With CH 48027) or Fuel Pressure Gage Installation and Removal (With CH 48027-100) .

NOTE:

The fuel pump may need to be commanded ON a few times, in order to obtain the highest possible fuel pressure.
Do NOT start the engine for this test.

Ignition ON, command the fuel pump ON with a scan tool. The fuel pressure should be between 345-414 kPa (50-60 psi).
- If the fuel pressure is not within the specified range, refer to Fuel System Diagnosis (Except Saturn) or Fuel System Diagnosis (Saturn Only) .
Verify that the following conditions do not exist:
- Collapsed air intake duct to the throttle body
- Restricted air filter element
- Spark plugs for being gas or coolant fouled-Refer to Spark Plug Inspection
- A skewed manifold absolute pressure (MAP) sensor-Compare the MAP Sensor parameter to the Altitude Versus Barometric Pressure table. Refer to Altitude Versus Barometric Pressure .
- A skewed engine coolant temperature (ECT) sensor-Compare the ECT Sensor parameter to the Temperature Versus Resistance table. Refer to Temperature Versus Resistance (ECT) or Temperature Versus Resistance (IAT 1) or Temperature Versus Resistance (IAT 2) .
- Exhaust system restricted-Refer to Restricted Exhaust .
- Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Engine mechanical condition, for example, worn timing belt or low compression-Refer to Symptoms - Engine Mechanical .
- If you find any of the above conditions, repair as necessary.