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7A2-102 TRANSMISSION CONTROL SYSTEM (AW30–40LE)
Circuit/System Testing DTC P1790
Step Action Value(s) YES NO 1
Was the On-Board Diagnostic (OBD) System Check — Go to Step 2 Go to OBD System Check 2 1. Install a scan tool. 2. Turn “OFF” the ignition and keep the position for more than 30 seconds. 3. Turn “ON” the ignition. 4. Check the DTC on a scan tool.
Does a scan tool indicate DTC P1791? — Go to Step 3 Refer to Diagnostic Aids 3 Perform the SPS for the TCM.
Is the action complete? — Go to Step 4 — 4 Recheck the DTC on the scan tool.
Does the scan tool indicate DTC P1790? — Go to Step 5 Go to Step 6 5 Replace the TCM. Important: The replacement TCM must be programmed (Refer to SPS for procedure).
Is the action complete? — Go to Step 6 — 6
1. Reconnect all previously disconnected harness connector(s). 2. Clear the DTCs with a scan tool. 3. Turn “OFF” the ignition. 4. Start the engine.
5. Operate the vehicle within the Conditions For Running the DTC. You may also operate the
Did the DTC fail this ignition? — Go to Step 2 Go to Step 7 7 Observe the stored information, Capture info with a
Are there any DTCs that you have not diagnosed? — Go to Diagnostic Trouble Code (DTC) List Verify repair
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