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Old March 6th, 2007, 07:02 AM   #4
Trail-XJ
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Quote:
Originally Posted by Trail-XJ View Post
thats from GM Service Info on that code

Important
Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The control module's data is deleted once the Clear Info function is used.


Did you perform the Powertrain On-Board Diagnostic System Check?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

2
Start the engine.
Command the EGR valve to the specified value using a scan tool.
Does the engine run rough or stall?
50%
Go to Step 3
Go to Step 5

3
Turn OFF the engine.
Turn ON the ignition leaving the engine OFF.
Command the EGR valve to the specified values using a scan tool.
Does the actual EGR position closely follow the commanded position?
0%, 20%, 50%, 70%, 100%
Go to Step 4
Go to Step 10

4
This DTC is intermittent.

Are any other DTCs set?
--
Go to the applicable DTC table
Go to Diagnostic Aids

5
Disconnect the EGR valve harness connector.
Probe the EGR valve control circuit at the EGR valve harness connector with a test lamp connected to a ground.
Command the EGR valve to the specified value using a scan tool.
Is the test lamp ON?
100%
Go to Step 6
Go to Step 7

6
Probe the EGR valve ground circuit at the EGR valve harness connector with a test lamp connected to B+.

Is the test lamp ON?
--
Go to Step 21
Go to Step 9

7
Check the EGR valve control circuit for a short to ground between the VCM and the EGR valve harness connector using a test lamp connected to B+.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?
--
Go to Step 25
Go to Step 8

8
Check the EGR valve control circuit for an open between the VCM and the EGR valve harness connector using a J 39200 DMM.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?
--
Go to Step 25
Go to Step 23

9
Check the EGR valve ground circuit for an open.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?
--
Go to Step 25
Go to Step 23

10
Disconnect the EGR valve harness connector.
Caution: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.

Start the engine.
Probe the EGR valve control circuit at the EGR valve harness connector with a test lamp connected to a ground.
Is the test lamp ON?
--
Go to Step 11
Go to Step 13

11
Turn OFF the ignition.
Disconnect the VCM C4 connector.
Turn ON the ignition leaving the engine OFF.
Probe the EGR valve control circuit at the EGR valve harness connector with a test lamp connected to a ground.
Is the test lamp ON?
--
Go to Step 17
Go to Step 12

12
Turn OFF the ignition.
With the VCM C4 connector still disconnected, check the EGR valve control circuit for a short to all of the other circuits in the C4 connector.
Are there any circuits shorted to the EGR valve control circuit?
--
Go to Step 18
Go to Step 24

13
Measure voltage between the 5 volt reference circuit at the EGR valve harness connector and a ground with a J 39200 DMM.

Is the voltage above the specified value?
5.2 V
Go to Step 19
Go to Step 14

14
Measure the voltage on the EGR valve pintle position signal circuit at the EGR valve harness connector with a J 39200 DMM connected to a ground.

Is the voltage at the specified value?
0 V
Go to Step 16
Go to Step 15

15
Check the EGR pintle position signal circuit between the EGR valve harness connector and the VCM for a short to voltage.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?
--
Go to Step 25
Go to Step 24

16
Probe the EGR sensor ground circuit at the EGR valve harness connector with a test lamp connected to B+.

Is the test lamp ON?
--
Go to Step 21
Go to Step 20

17
Repair the short to voltage to the EGR valve control circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Go to Step 25
--

18
Repair the short to the EGR valve control circuit. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Is the action complete?
--
Go to Step 25
--

19
Repair the short to voltage in the 5 volt reference circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Go to Step 25
--

20
Disconnect the VCM C3 connector.
Check the EGR sensor ground circuit between the VCM and the EGR valve for an open.
Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find a problem?
--
Go to Step 25
Go to Step 23

21
Check for a poor connection at the EGR valve. Refer to Connector Repairs in Wiring Systems.

Did you find a problem?
--
Go to Step 25
Go to Step 22

22
Replace the EGR valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .

Is the action complete?
--
Go to Step 25
--

23
Check the VCM connectors for a poor connection. Repair as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find a problem?
--
Go to Step 25
Go to Step 24

24
Replace the VCM.
Program the new VCM. Refer to VCM Replacement/Programming .
Perform the Password Learn Procedure. Refer to Password Learn Procedure .
Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure .
Is the action complete?
--
Go to Step 25
--

25
Using the scan tool, clear the DTCs.
Start the engine.
Allow the engine to idle until the engine reaches normal operating temperature.
Select DTC and the Specific DTC function.
Enter the DTC number that was set.
Operate the vehicle, within the Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?
Go to Step 26
Go to Step 2

26
Does the scan tool display any additional undiagnosed DTCs?
--
Go to the applicable DTC table
System OK
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