| STEP |
ACTION |
YES |
NO |
| 1 |
Did you perform the Diagnostic System Check - Vehicle? |
Go to Step 2 |
Go to Diagnostic System Check - Vehicle |
| 2 |
1. Turn ON the ignition, with the engine OFF.
2. Observe the DTC information with a scan tool.
Does the scan tool display DTCs P0101, P0108, P0230, P0335, P0336, P0601, P0602, P0604, P0606, P0607, P0641, P0651, P0685, P0689, P0690, P1621, P1630, P1631, P1682, or P2610?
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Go to Diagnostic Trouble Code (DTC) List - Vehicle
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Go to Step 3 |
| 3 |
Does the scan tool display any body control module (BCM) or vehicle theft deterrent (VTD) DTCs?
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Go to Diagnostic Trouble Code (DTC) List - Vehicle
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Go to Step 4 |
| 4 |
1. Turn ON the ignition, with the engine OFF.
2. Probe both sides of the fuses located in the underhood electrical center listed below using a test lamp connected to ground.
• The auto trans fuse
• The engine sensor fuse
• The INJ/IGN fuse, even bank
• The INJ/IGN fuse, odd bank
Does the test lamp illuminate on at least one side of each fuse?
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Go to Step 5 |
Go to DTC P0685, P0689, or P0690
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| 5 |
Command the fuel pump ON with a scan tool.
Does the fuel pump operate?
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Go to Step 6
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Go to Fuel Pump Electrical Circuit Diagnosis
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| 6 |
1.Turn OFF the ignition.
2. Disconnect a spark plug wire.
3. Install J 26792 Spark Tester.
4. Attempt to start the engine.
Does the spark tester spark?
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Go to Step 7 |
Go to Electronic Ignition System Diagnosis
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| 7 |
1. Turn OFF the ignition.
2. Install a fuel pressure gauge. Refer to Fuel Pressure Gauge Installation and Removal.
Important: You may need to command the fuel pump ON a few times to obtain the highest possible fuel pressure.
3. Turn ON the ignition, with the engine OFF.
4. Command the fuel pump ON with a scan tool.
5. Observe the fuel pressure while the fuel pump is operating.
Is the fuel pressure within the specified range?
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Go to Step 8 |
Go to Fuel System Diagnosis
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| 8 |
Inspect for the following conditions:
• Collapsed air intake duct
• Restricted air filter element--Refer to Air Cleaner Element Replacement.
• Spark plugs for being fouled--Refer to Spark Plug Inspection. If the spark plugs are fouled, determine what caused the condition.
• Engine mechanical condition, for example, broken timing chain, low compression--Refer to Engine Compression Test.
• Restricted exhaust system--Refer to Restricted Exhaust.
• An engine coolant temperature (ECT) sensor that has shifted in value--Refer to Temperature Versus Resistance.
• Compare the MAP parameter to another vehicle. The parameters should be close in value. Refer to DTC P0106.
Did you complete the action?
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Go to Step 9
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Go to Hard Start
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| 9 |
1.Clear the DTCs with a scan tool.
2. Attempt to start the engine.
Does the engine start and continue to operate?
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Go to Step 10 |
Go to Step 2
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| 10 |
1. Idle the engine.
2. Allow the engine to reach operating temperature.
3. Observe the DTC information with a scan tool.
Are any DTCs displayed?
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Go to Diagnostic Trouble Code (DTC) List - Vehicle
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System OK
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