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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls - 2.6L & 3.2L - Diagnosis (DTC P2096 - P2636)) >> Diagnostic Trouble Codes >> DTC P2636 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step determines if a condition current.
  2. 4:  This step verifies possible component problems within the fuel tank.
DTC P2636

Step Action Values Yes No
Schematic Reference:  Power and Grounding Component Views  in Wiring Systems or  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls 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 
  1. Observe the Freeze Frame/Failure Records for this DTC.
  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 or as close to the Freeze Frame/Failure Records that you observed.
Did the DTC fail this ignition?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect the control module harness C2 connector.
  3. Disconnect C420.
  4. Test the left fuel level sender circuit between C420 and the engine control module for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 7  Go to Step 4 
4 
  1. Remove the fuel tank. Refer to Fuel Tank Replacement .
  2. Remove the fuel tank right and left modules. Refer to Fuel Tank Module Replacement - Primary or Fuel Tank Module Replacement - Secondary .
  3. Inspect for the following conditions:
    • High resistance in the left fuel level sensor
    • A clogged left fuel tank module strainer and pick up
    • A clogged or restricted siphon jet pump
    • Broken, clogged or restricted flex tubes, right fuel tank module
    • Broken, clogged, or restricted fuel transfer tube inside tank
Did you find and correct the condition?		 - Go to Step 7  Go to Step 5 
5 Inspect for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
6 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 7  -
7
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 8 
8 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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