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Diagnostic Aids

An over charging condition may set this DTC. Refer to Diagnostic System Check - Engine Electrical in Engine Electrical.

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Repair the circuits as necessary. Refer to Intermittent Conditions .

DTC P1640

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Connector End Views  or  Powertrain Control Module (PCM) Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Is DTC P0560 set? Go to Diagnostic System Check - Engine Electrical in Engine Electrical Go to Step 3 
3
  1. With a scan tool, select the Output Driver Data list.
  2. Observe the parameters on the scan tool.
Do any parameters indicate a fault present?		 Go to Step 4  Go to Step 5 
4 Test for a short to voltage on the control circuit of the component that indicated a fault.
Did you find and correct the condition?		 Go to Step 6  Go to Step 5 
5 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 Go to Step 6  -
6
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?		 Go to Step 7  Go to Step 2 
7 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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