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Home >> Buick >> 2004 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (DTC P0140 To P0496) >> Engine Controls Diagnosis >> DTC P0336 >> Test Description

Test Description

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

  1. 2:  If you were sent here from DTC P0327, proceed with DTC P0336 Diagnostic even if DTC P0336 has not failed this ignition.
  2. 8:  The 24X RPM on the scan tool should change each time the medium resolution engine speed signal circuit is touched.
DTC P0336

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Component 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 
  1. Start the engine.
  2. Observe the 24X parameter with a scan tool.
Does 24X RPM vary with engine speed up to approximately 1,600 RPM?		 - Go to Step 3  Go to Step 4 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition.
  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.
Does the DTC fail this ignition?		 - Go to Step 4  Go to Diagnostic Aids
4
IMPORTANT: A short to ground on the cam or crankshaft position sensor 12-volt reference circuit can cause DTC P0327 to set. Test this circuit for a short to ground before proceeding with this diagnostic table. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  1. Turn OFF the ignition.
  2. Disconnect the CKP sensor A connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the 12-volt reference circuit of the CKP sensor A to a good ground with the DMM.
Does the voltage measure near the specified value?		 B+ Go to Step 6  Go to Step 5 
5 Test the 12-volt reference circuit of the CKP sensor A for the following conditions:
  • An Open
  • A short to ground
  • High resistance

Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
6
  1. Connect a test lamp to battery positive voltage.
  2. Touch the CKP sensor A low reference circuit.
Does test lamp illuminate?		 - Go to Step 8  Go to Step 7 
7 Test the low reference circuit of the CKP sensor A for an open or for high resistance. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
8 
  1. Observe the 24X RPM with a scan tool.
  2. Connect a 5-amp fused jumper wire to battery positive voltage, momentarily touch the medium resolution engine speed signal circuit 5 times for a duration of 1 second each.
Does 24X RPM change each time the signal circuit is touched?		 - Go to Step 13  Go to Step 9 
9 Did the fuse in the jumper wire open? - Go to Step 11  Go to Step 10 
10 Test the medium resolution engine speed signal circuit of the CKP sensor A for the following conditions:
  • An Open
  • A short to voltage
  • High resistance

Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
11 Test the medium resolution engine speed signal circuit of the CKP sensor A for a short to ground. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
12 Test for an intermittent or for a poor connection at the PCM. Refer to Testing for Continuity and Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
13 Test for an intermittent or for a poor connection at the 24X CKP sensor. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
14 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 16  -
15 Replace CKP sensor A. Refer to Crankshaft Position (CKP) Sensor Replacement (7X)Crankshaft Position (CKP) Sensor Replacement (24X) .
Did you complete the replacement?		 - Go to Step 16  -
16
  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 17 
17 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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