The numbers below refer to the step numbers on the diagnostic table.
This step ensures that the battery, and the vehicle primary power and ground systems are functioning correctly.
Lack of communication may be due to a particular malfunction of a serial data circuit. The information in Scan Tool does not Communicate with Class 2 Device will provide a list of modules and the associated data network no communication diagnostic link.
This step ensures that all data link communication DTCs are diagnosed before system level DTCs.
This step ensures that all electronic control unit (ECU) internal DTCs are diagnosed before other system level DTCs.
This step ensures that all device voltage DTCs are diagnosed before other system level DTCs.
Step | Action | Yes | No | ||||||||||||||
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Perform the following preliminary inspections:
Did you find and correct the condition? | System OK | Go to Step 2 | |||||||||||||||
2 | Install a scan tool. Does the scan tool power up? | Go to Step 3 | |||||||||||||||
Does the scan tool communicate with all of the expected vehicle control modules? | Go to Step 4 | ||||||||||||||||
4 | Attempt to start the engine. Does the engine crank? | Go to Step 5 | |||||||||||||||
5 |
Important: For the 7.2L Caterpillar Engine, refer to the appropriate Caterpillar Service Manual. Attempt to start the engine. Does the engine start and idle? | Go to Step 6 |
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6 |
Important:
Use the appropriate scan tool selections to obtain DTCs for each of the control modules. Does the scan tool display any DTCs? | Go to Step 7 | Go to Symptoms - Vehicle | ||||||||||||||
Does the scan tool display any DTCs that begin with a "U"? | Go to Step 8 | ||||||||||||||||
Important: If any of these DTCs are displayed, diagnose them before diagnosing any other DTCs or symptoms. Does the scan tool display DTC B1000, B1001, C0550, P0601, P0602, P0604, P0606, P060B, P061C, P062C, P062F, P064C, P1621, P160C, P2108, or P2610? | Go to Step 9 | ||||||||||||||||
Important: If any of these DTCs are displayed, diagnose them before diagnosing any other DTCs or symptoms. Does the scan tool display DTC C0899, C0900, P0562, or P0563? | Go to Step 10 | ||||||||||||||||
10 |
Important: If any of the remaining DTCs are powertrain DTCs, select Capture Info in order to store the powertrain DTC information with a scan tool. If multiple DTCs are stored, diagnose the DTCs in the following order:
Diagnose the remaining DTCs. | -- |