Circuit/System Verification

NOTE: This diagnostic assumes the following:

The battery is completely charged. Refer to BATTERY INSPECTION/TEST .
The engine cranking speed is acceptable. Refer to ENGINE CRANKS SLOWLY .
There is adequate fuel in the fuel tank.

Crank or start the engine. Observe the DTC information with a scan tool. Verify that DTC P0116, P0118, P0119, P0201-P0206, P0335, P0336, P0337, P0338, P0351-P0356, P0601, P0602, P0604, P0606, P0627, P0628, P0629, P1629, P1631, P1632, or P2105 is not set.
- If a DTC is set, refer to DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE DIAGNOSTIC INFORMATION .
Ignition ON, observe the Theft Deterrent parameter with a scan tool. The parameter should display Disabled.
- If Enabled is displayed, refer to DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE DIAGNOSTIC INFORMATION .
Test the ignition system for spark. Refer to ELECTRONIC IGNITION (EI) SYSTEM DIAGNOSIS .
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, install the J 34730-1A. Refer to FUEL PRESSURE GAGE INSTALLATION AND REMOVAL .
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 380-410 kPa (55-60 psi).
- If the fuel pressure is not within range, refer to FUEL SYSTEM DIAGNOSIS .
Verify that the following conditions do not exist:
- Disconnect the MAF sensor. The engine control module (ECM) will ignore the MAF sensor and default to the calculated air flow.
  - If disconnecting the MAF sensor corrects the condition and the connections are OK, replace the MAF sensor. Refer to MASS AIRFLOW SENSOR/INTAKE AIR TEMPERATURE SENSOR REPLACEMENT .
- 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 engine coolant temperature (ECT) sensor-Refer to TEMPERATURE VERSUS RESISTANCE - ENGINE COOLANT TEMPERATURE 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 chain and gears, low compression - Refer to SYMPTOMS - ENGINE MECHANICAL .
  - If you find any of the above conditions, repair as necessary.