Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
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.
- Ignition ON, observe the DTC information with a scan tool. Verify that DTCs P0685, P0686, P0687, P0689, or P0690 do not set?
- If any of the listed DTCs are set, refer to DTC P0685, P0686, P0687, P0689, or P0690 .
- Crank the engine for 15 seconds, observe the DTC information with a scan tool. Verify that DTCs P0118, P0201-P0206, P0335, P0336, P0337, P0338, P0351-P0356, P0601, P0602, P0604, P0606, P0627, P0628, P0629, P1629, P1630, P1631, or P2105 do not set.
- If any of the listed DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition ON, observe the Theft Deterrent DTC information with a scan tool. Verify that no Theft Deterrent DTCs are set.
- If any Theft Deterrent DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- 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 CH-48027 . See Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
- 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 .
IMPORTANT:
- If you find any of the above conditions, repair as necessary.