Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Control Module (ECM) Connector End Views
or Engine Controls Connector End Views |
| 1 |
Did you perform the Diagnostic System Check-Engine Controls? |
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Go to Step 2 |
Go to Diagnostic System Check - Engine Controls |
| 2 |
- Crank the engine over for 15 seconds.
- Turn ON the ignition, with the engine OFF.
- Observe the Engine DTC information with a scan tool.
Does the scan tool display DTC P0118, P0201-P0206, P0335, P0336, P0338, P0351-P0356, P0601, P0602, P0604, P0606, P0627, P0628, P0629, P1629, P1630, P1631, or P2105? |
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Go to Diagnostic Trouble Code (DTC) List |
Go to Step 3 |
| 3 |
Observe the Theft Deterrent DTC Information with a scan tool.
Does the scan tool display any Theft Deterrent DTCs? |
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Go to Diagnostic System Check - Theft Deterrent
in Theft Deterrent |
Go to Step 4 |
| 4 |
IMPORTANT:
- The Fuel Pump Relay Command parameter may not change from OFF to ON or ON to OFF when using the Fuel Pump output control.
- Additional DTCs may set when using the Fuel Pump output control.
With a scan tool, command the fuel pump ON.Does the fuel pump turn ON? |
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Go to Step 5 |
Go to Fuel Pump Electrical Circuit Diagnosis |
| 5 |
- Turn OFF the ignition.
- Install the J 34730-1A
Fuel Pressure Gage. Refer to Fuel Pressure Gage Installation and Removal
.
- Turn ON the ignition, with the engine OFF.
IMPORTANT:
- The Fuel Pump Relay Command parameter may not change from OFF to ON or ON to OFF when using the Fuel Pump output control.
- Additional DTCs may set when using the Fuel Pump output control.
- Command the fuel pump ON with a scan tool.
Is the fuel pressure within the specified range while the fuel pump is operating? |
380-410 kPa (55-60 psi) |
Go to Step 6 |
Go to Fuel System Diagnosis |
| 6 |
Inspect for the following conditions:
- A short to voltage in the signal circuit of the CKP sensor will cause the engine to stall or not start and a DTC will not set. Refer to DTC P0335
.
- Collapsed air intake duct between the mass air flow (MAF) sensor and the throttle body
- Restricted air filter element
- Test for water or alcohol contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (w/Special Tool) .
- Spark plugs for being gas or coolant fouled-If the spark plugs are fouled, determine what caused the condition, refer to the following procedures:
- Inspect for a malfunctioning MAF sensor causing a no start or a stall after a start. If this condition is suspected, use the following procedure:
- Engine mechanical condition, for example, worn timing chain and gears, low compression- Refer to Symptoms - Engine Mechanical
in Engine Mechanical - 3.6L (LY7).
- Restricted exhaust system-Refer to Restricted Exhaust
in Engine Exhaust
- The engine coolant temperature (ECT) sensor is NOT close to the actual engine temperature. Refer to DTC P0125
.
Did you complete the action? |
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Go to Step 7 |
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| 7 |
- With a scan tool, clear the DTCs.
- Attempt to start the engine.
Does the engine start and continue to operate? |
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Go to Step 8 |
Go to Step 2 |
| 8 |
- Idle the engine.
- Allow the engine to reach operating temperature.
- Observe the DTC information with a scan tool.
Are there any DTCs that have not been diagnosed? |
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Go to Diagnostic Trouble Code (DTC) List |
System OK |