Circuit/System Testing

Crank the engine for 15 seconds. Observe the DTC information with a scan tool. The following DTCs should not be set:
P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0335, P0336, P0337, P0351, P0352, P0353, P0354, P0355, P0356, P0604, P0605, P0689 P0690, or U0101.
- If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the Theft Deterrent parameter with a scan tool. The parameter should display Disabled.
- If Enabled is displayed, refer to Symptoms - Theft Deterrent .
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 System Diagnosis .
Ignition OFF, remove the fuel pump relay.
Disconnect an ignition coil from a cylinder.
Connect the J 26792 to the boot of the ignition coil and a good ground.

IMPORTANT: 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 Electronic Ignition (EI) System Diagnosis .
Ignition OFF, install the fuel pump relay.
Ignition OFF, install the J 34730-1A . Refer to Fuel Pressure Gage Installation and Removal .

IMPORTANT:

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 294-335 kPa (43-49 psi).
- If the fuel pressure is not within range, refer to Fuel System Diagnosis .
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.
- A skewed manifold absolute pressure (MAP) sensor.
- A skewed engine coolant temperature (ECT) sensor.
- Exhaust system restricted-refer to Restricted Exhaust .
- Fuel contamination - refer to Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (w/Special tool) .
- 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.