LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1862 (Engine Controls And Fuel - 3.5L (L66) - DTC P0223 To DTC P0499) >> DTC P0385 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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. 2:  This step determines whether the DTC P0385 is the result of a hard failure or an intermittent condition.
  3. 5:  This step tests the CKP sensor input circuit.
  4. 12:  After replacing the PCM new minimum throttle position and idle speed must also be established.
DTC P0385

Step Action Values Yes No
Connector End View Reference:  Powertrain Control Module 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
2 
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Clear the DTCs with a scan tool.
  3. Turn OFF the ignition for 30 seconds.
  4. Start the engine.
  5. 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 3  Go to Diagnostic Aids In This Test
3
  1. Turn OFF the ignition.
  2. Disconnect the crankshaft position (CKP) sensor electrical connector.
  3. Connect a test lamp between the CKP sensor B ground circuit and B+.
Did the test lamp illuminate?		 - Go to Step 4  Go to Step 7 
4
  1. Connect a DMM to the ignition 1 voltage circuit of the CKP sensor B and ground.
  2. Turn ON the ignition, with the engine OFF.
Is the voltage near the specified value?		 12 V Go to Step 5  Go to Step 8 
5 
  1. Connect the DMM to the signal circuit of CKP sensor B and ground.
  2. Turn ON the ignition, with the engine OFF.
Is the voltage near the specified value?		 5.0 V Go to Step 10  Go to Step 6 
6
  1. Test for an open or a short in the CKP sensor B signal circuit.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and repair a condition?		 - Go to Step 13  Go to Step 9 
7
  1. Repair the open in the CKP sensor B ground circuit.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 13  -
8
  1. Locate and repair the open in the ignition 1 voltage circuit of the CKP sensor B.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 13  -
9
  1. Test for an intermittent or a poor electrical connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 13  Go to Step 12 
10
  1. Test for an intermittent or a poor electrical connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 13  Go to Step 11 
11 Replace the crankshaft position sensor. Refer to Crankshaft Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 13  -
12 
  1. Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
Did you complete the replacement?		 - Go to Step 13  -
13
  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 14  Go to Step 2 
14 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
scientia non olet · About LEMON Manuals