Did you perform the On-Board Diagnostic (OBD) System Check performed?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Check that all of the pins are fully inserted in their sockets.

If you find a problem, repair as necessary.

Did you find a problem?

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Go to Step 4

Go to Step 3

Replace the PROM. Refer to PROM Replacement

Is the action complete?

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Go to Step 4

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Clear the memory. Recheck the memory.

Does a DTC 51 reappear?

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Go to Step 5

Go to Step 6

Replace the ECM. Refer to Engine Control Module Replacement

Is the action complete?

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Go to Step 6

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1. Clear the DTCs. Refer to Clearing DTCs.
2. Start the engine and allow the engine to idle at the normal operating temperature.
3. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text.

Did the DTC reset?

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Go to Step 2

Go to Step 7

Are any DTCs stored which you have not diagnosed?

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Go to the Applicable DTC Table

System OK