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 the engine for 15 s. Observe the DTC information with a scan tool. The following DTCs should not be set:
DTC P0201-P0205, P0335, P0336, P0351-P0355, P0601-P0607, P060D, P062F, P0685, P0690, P1516, P1682, P2610
- If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Connect a J 26792: Tester to the boot of an ignition coil of a cylinder and ground.
- 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 CH 48027: Gauge. Refer to Fuel Pressure Gauge Installation and Removal .
- Ignition ON, command the fuel pump ON with a scan tool. The fuel pressure should be between 345-427 kPa (50-62 psi).
- If the fuel pressure is not within the specified 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-Refer to DTC P0106 .
- A skewed engine coolant temperature (ECT) sensor-Refer to Temperature Versus Resistance .
- Exhaust system restricted-Refer to Restricted Exhaust .
- Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Engine mechanical condition, for example, worn timing chain or low compression-Refer to Engine Compression Test or Symptoms - Engine Mechanical .
- If you find any of the above conditions, repair as necessary.
NOTE:
An erratic or weak spark is considered a no spark condition.
NOTE:
The fuel pump may need to be commanded ON a few times, in order to obtain the highest possible fuel pressure.