Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor circuits are connected directly to the engine control module (ECM) and consists of the following circuits:
| • | The 12-volt reference circuit |
| • | The low reference circuit |
| • | The CKP sensor signal circuit |
If the ECM detects that there is no signal from the CKP sensor for 3 seconds, DTC P0335 sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0335 Crankshaft Position (CKP) Sensor Circuit
Conditions for Running the DTC
| • | DTCs P0101, P0102, P0103, P0341, P0342, or P0343 are not set. |
| • | The camshaft position (CMP) sensor signal is incrementing. |
| • | The mass air flow (MAF) is more than 5 g/s. |
| • | The engine is cranking or running. |
| • | DTC P0335 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
The ECM detects that there is no signal from the CKP sensor for 3 seconds.
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 P0335 and P0340 will set with the ignition switch in the Start position if the starter monitor is inoperative, or the starter motor control circuit is inoperative. When the ECM enables starter motor operation, the ECM also initiates the diagnostic test routines for DTCs P0335 and P0340. If a condition exists which prevents the engine from cranking, the ECM will not receive a signal input from the CKP and the camshaft position (CMP) sensors.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if the fault is present.
-
This step simulates a CKP sensor signal to the ECM. If the ECM receives the signal, the fuel pump will operate for about 2 seconds.
Step | Action | Values | Yes | No | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||
2 | Attempt to start the engine. Does the engine start and continue to run? | -- | Go to Step 3 | Go to Step 4 | ||||||||||||
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections | |||||||||||||
4 |
Does the voltage measure above the specified value? | 11.8 V | Go to Step 5 | Go to Step 7 | ||||||||||||
5 | Measure the voltage between the 12-volt reference circuit of the CKP sensor and the low reference circuit of the CKP sensor with a DMM. Does the voltage measure above the specified value? | 11.8 V | Go to Step 6 | Go to Step 8 | ||||||||||||
Momentarily connect a test lamp between the CKP sensor signal circuit and the 12-volt reference of the CKP sensor. Does the fuel pump operate when the test lamp is applied to the CKP sensor signal circuit? | -- | Go to Step 10 | Go to Step 9 | |||||||||||||
7 | Test the 12-volt reference circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct condition? | -- | Go to Step 16 | Go to Step 12 | ||||||||||||
8 | Test the low reference circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | ||||||||||||
9 | Test the CKP sensor signal circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | ||||||||||||
10 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||||||||
11 | Visually inspect the CKP sensor reluctor wheel for the following conditions:
Refer to Crankshaft and Bearing Cleaning and Inspection . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||||||||
12 | Test for poor connections at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||||||||
13 | Test for poor connections at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||||
14 | Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||||
15 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. 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 | |||||||||||||
