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Home >> Pontiac >> 2006 >> Vibe Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System - 1.8L (LNK) - DTC P0453 To DTC P2647) >> DTC P2645 >> 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. 1:  The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 4:  This step checks the operation of the rocker arm oil control solenoid. This inspection is to be performed when the vehicle is at normal operating temperature with the engine speed at 1,500-2,500 RPM. Turning ON the rocker arm oil control solenoid will increase valve lift enough to cause a significant drop in engine speed.
  3. 8:  This step checks for electrical resistance in the wiring and connections of the rocker arm oil control solenoid circuit. Circuit resistance as small as 45 ohms can cause a DTC P2645 to set.
DTC P2645

Step Action Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1  Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Perform the scan tool Clear DTC Information function.
  2. Start the engine.
  3. Operate the engine for 1 minute.
  4. Review the scan tool data and check for DTC P2645.
Is DTC P2645 set?		 Go to Step 4  Go to Step 3 
3
  1. Start the engine.
  2. Allow the engine to reach normal operating temperature.
  3. With the transmission in Neutral, increase the engine speed to 1,500-2,500 RPM.
  4. Command the rocker arm oil control solenoid ON with the scan tool. Refer to Scan Tool Output Controls .
Does the engine idle very rough or stall when the rocker arm oil control solenoid is commanded ON?		 Go to Intermittent Conditions Go to Step 4 
4 
  1. Start the engine.
  2. Ensure that the engine has reached operating temperature.
  3. Turn OFF the engine.
  4. Disconnect the electrical connector to the rocker arm oil control solenoid valve.
  5. Start the engine.
  6. With the transmission in Neutral, increase the engine speed to 1,500-2,500 RPM.
  7. Connect the rocker arm oil control solenoid to B+ and ground with a pair of fused jumper wires.
Does the engine idle very rough or stall when the rocker arm oil control solenoid is connected to B+?		 Go to Step 5  Go to Step 7 
5
  1. Inspect the control high circuit of the rocker arm oil control solenoid for an open or a short.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 Go to Step 10  Go to Step 6 
6
  1. Inspect the control low circuit of the rocker arm oil control solenoid for an open or a short.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 Go to Step 10  Go to Step 8 
7 Replace the rocker arm oil control solenoid. Refer to Rocker Arm Oil Control Solenoid Valve Replacement .
Is the action complete?		 Go to Step 10  -
8 
  1. Inspect the electrical circuits and connections of the rocker arm oil control solenoid for high electrical resistance.
  2. Inspect for poor connections at the harness connectors of the powertrain control module (PCM) and the rocker arm oil control solenoid.
  3. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 Go to Step 10  Go to Step 9 
9 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Is the action complete?		 Go to Step 10  -
10
  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 11  Go to Step 2 
11 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 - Vehicle in Vehicle DTC Information System OK
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