Perform the following preliminary inspections:

1. Ensure that the battery is fully charged. Refer to Battery Inspection/Test in Engine Electrical.
2. Ensure that the battery cables are clean and tight.
3. Inspect the easily accessible systems or the visible system components for obvious damage or conditions that could cause the symptom. Refer to Strategy Based Diagnosis in General Information.
4. Ensure that the engine and control module grounds are clean, tight, and in the correct location.
5. Inspect for aftermarket devices that could affect the operation of the system. Refer to Checking Aftermarket Accessories in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 2

1. Install a scan tool.
2. Turn ON the scan tool.

Does the scan tool turn ON?

Go to Step 3

Go to Scan Tool Does Not Power Up in Data Link Communications

1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the listed control modules. If you are using a Tech 2, obtain the information using the Class 2 Message Monitor feature:

•	Instrument Panel Cluster (IPC)

•	Engine control module (ECM)

•	Electronic brake control module (EBCM)

•	Body control module (BCM)

Does the scan tool communicate with all the listed modules?

Go to Step 4

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

Attempt to start the engine.

Does the engine crank?

Go to Step 5

Go to Symptoms - Engine Electrical in Engine Electrical

Does the engine start and run?

Go to Step 6

Go to Symptoms - Engine Controls

Important: Do NOT clear the DTCs unless instructed by a diagnostic procedure.

1. Select the DTC display function for the following control modules and record the DTCs:

•

IP

•

ECM

•

EBCM

•

BCM

2. If there are any powertrain DTCs, select Capture Info to store the powertrain DTC information with a scan tool.

2.1.	Component level DTCs--For example, sensor DTCs, solenoid DTCs, and relay DTCs

Begin with the lowest number DTC unless the diagnostic table directs you otherwise.

2.2.	System level DTCs--For example, misfire DTCs, EVAP system DTCs, fuel trim DTCs, and system voltage DTCs

Does the scan tool display any DTCs which begin with a "U"?

Go to Diagnostic Trouble Code (DTC) List in Data Communications

Go to Step 7

Does the scan tool display DTC P0601, P0602, P0604, P0606, or P2610?

Go to DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610

Go to Step 8

Does the scan tool display DTC P0562 or P0563?

Go to DTC P0562 and DTC P0563 in Engine Electrical

Go to Step 9

Important: DO NOT clear the DTCs unless instructed by a diagnostic procedure.

1. Review the Captured Info. If multiple powertrain DTCs are stored, diagnose the DTCs in the following order:

1.1.	Component level DTCs-For example, sensor DTCs, solenoid DTCs, and relay DTCs. Begin with the lowest number DTC unless the diagnostic table directs you otherwise.

1.2.	System level DTCs-For example, misfire DTCs, EVAP system DTCs, fuel trim DTCs, and system voltage DTCs.

2. Search for applicable service bulletins.

Does the scan tool display any DTCs?

Go to Diagnostic Trouble Code (DTC) List for applicable diagnostic procedure

Go to Step 10

Is the customers concern with the automatic transmission?

Go to Diagnostic System Check - Automatic Transmission in Automatic Transaxle 5AT/VT25-E

Go to Step 11

Is the customer's concern with Inspection/Maintenance (I/M) testing?

Go to Inspection/Maintenance (I/M) System Check

Go to Step 12

Are there any driveability symptoms observed?

Go to Symptoms - Engine Controls

System OK