Circuit Description
The circuit uses 2 different types of crankshaft position (CKP) sensors. The CKP sensor B is connected directly to the ignition control (IC) module, and consists of the following circuits:
| • | The CKP 1 sensor signal circuit |
| • | The low reference circuit |
The CKP sensor A connects directly to the powertrain control (PCM) module, and consists of the following circuits:
| • | The 12-volt reference circuit |
| • | The medium resolution engine speed signal circuit |
| • | The low reference circuit |
If the PCM detects an incorrect number of CKP pulses, DTC P0336 sets.
Conditions for Running the DTC
The engine is running, and the 3X reference pulses have been received for a minimum of 3 seconds.
Conditions for Setting the DTC
The ratio of 24X reference pulses to 3X reference pulses received by the PCM is incorrect.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
DTC P0336 can be caused by secondary components leaking high voltage into the ignition control (IC) module. Inspect for the following conditions:
| • | Incorrect harness routing near the secondary ignition components |
| • | Ignition coil arcing to wiring harness or IC module--Inspect ignition coils for cracks, for carbon tracking, or for other signs of damage. |
| • | Secondary ignition wires arcing to the wiring harness |
| • | If the DTC is determined to be intermittent, refer to Intermittent Conditions . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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If you were sent here from DTC P0327, proceed with DTC P0336 Diagnostic even if DTC P0336 has not failed this ignition.
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The 24X RPM on the scan tool should change each time the medium resolution engine speed signal circuit is touched.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
Does 24X RPM vary with engine speed up to approximately 1,600 RPM? | -- | Go to Step 3 | Go to Step 4 | |
3 |
Does the DTC fail this ignition? | -- | Go to Step 4 | Go to Diagnostic Aids |
4 |
Important: A short to ground on the cam sensor 12-volt reference circuit can cause DTC P0336 and 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.
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 a short to ground or for an open. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 |
6 |
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. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 |
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 a short to voltage or for an open. 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 Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace CKP sensor A. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
16 |
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? | -- | System OK | |
