Circuit/System Verification
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This diagnostic assumes the following:
- The battery is completely charged.
- The engine cranking speed is acceptable.
- There is adequate fuel in the fuel tank.
- Crank the engine for 15 seconds.
- Verify that DTCs P0116, P0118, P0119, P0191, P0192, P0193, P0201, P0202, P0203, P0204, P0205, P0206, P0231, P0232, P023F, P025A, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0335, P0336, P0338, P0351-P0356, P0601, P0602, P0604, P0606, P062B, P069E, P0627, P0628, P0629, P0641, P167D, P1629, P1631, P1632, P2105 P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, or U0109 is not set.
- If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If none of the DTCs are set
- If any of the DTCs are set
- Ignition ON.
- Verify that the Theft Deterrent indicator located in the driver information center illuminates momentarily.
- If the indicator stays ON or is flashing
Review the Diagnostic Trouble Code (DTC) List - Vehicle , for Immobilizer system DTCs. For additional information, refer to Immobilizer Description and Operation .
- If the indicator illuminates momentarily
- If the indicator stays ON or is flashing
- Verify the scan tool Engine Speed parameter displays an engine speed greater than 0 RPM while cranking the engine.
- If 0 RPM
Refer to DTC P0335 or P0336 .
- If greater than 0 RPM
- If 0 RPM
- Verify the scan tool Mass Airflow Sensor parameter displays greater than 0 Hz while cranking the engine.
- If 0 Hz
Refer to DTC P0102 or P0103 .
- If greater than 0 Hz
- If 0 Hz
- Ignition OFF, connect the J 26792 HEI Spark Tester between the spark plug boot of a T8 Ignition Coil and ground.
- Perform the spark test on at least three of the cylinders.
- An erratic or weak spark is considered to be a no spark condition.
- Verify the spark tester sparks while cranking the engine.
- If the spark tester does not spark
Refer to Electronic Ignition System Diagnosis .
- If the spark tester sparks
- If the spark tester does not spark
- Ignition ON, engine OFF.
- If the engine is too hot, high fuel pressure readings may result due to hot soak fuel boiling. Allow the engine coolant temperature to cool to less than 60° C (150° F) before attempting to verify fuel pressure.
- The Fuel Pump Enable may need to be commanded On a few times in order to obtain the highest possible fuel pressure.
- Additional DTCs may set when using the fuel pump output control.
- Command the Fuel Pump Enable On several times with a scan tool.
- Verify the scan tool Fuel Pressure Sensor parameter is between 345-690 kPa (50-100 psi) with the fuel pump running.
- If not within the specified range
Refer to Fuel System Diagnosis .
- If within the specified range
- If not within the specified range
- Verify the scan tool Fuel Pressure Sensor parameter, after the fuel pump has turned OFF, decreases to between 500-599 kPa (72-87 psi) and does not decrease more than 34 kPa (5 psi) in 1 minute.
- If not within the specified range
Refer to Fuel System Diagnosis .
- If within the specified range
- If not within the specified range
- Verify that the conditions listed below 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 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 .
- Engine mechanical condition, for example, worn timing chain and gears, low compression-Refer to Symptoms - Engine Mechanical
.
- If a condition exists
Repair as necessary.
- If no conditions exist
- If a condition exists
- All OK.
NOTE:
A MAF sensor circuit condition may cause an Engine Cranks But Does Not Run condition without setting a DTC.
NOTE:
NOTE:
NOTE:
The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant.