Circuit Description
The 58X reference signal is produced by the crankshaft position (CKP) sensor. During 1 crankshaft revolution, 58 crankshaft pulses will be produced. The engine control module (ECM) uses the 58X reference signal to calculate engine RPM and CKP. The ECM constantly monitors the number of pulses on the 58X reference circuit and compares them to the number of camshaft position (CMP) signal pulses being received. If the ECM does not receive any 58X reference pulses on the 58X reference circuit while cranking, DTC P0337 will set.
Conditions for Setting the DTC
| • | The 58X reference pulse is not seen during cranking. |
| • | DTCs P0341 and P0342 are not set. |
| • | The change in voltage drop is greater than 1.5 volts and the change in manifold absolute pressure (MAP) is greater than 2.2 kPa (0.32 psi) for manual transaxle. |
| • | The change in voltage drop is greater than 1.5 volts and the change in MAP is greater than 1 kPa (0.15 psi) for manual transaxle. |
| • | The 58X reference pulse is not seen for 0.2 seconds. |
Action Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate. |
| • | The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffer. |
| • | A history DTC is stored. |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF after 4 consecutive ignition cycles in which the diagnostic runs without a fault. |
| • | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault. |
| • | The DTCs can be cleared using the scan tool. |
| • | Disconnect the ECM battery feed for more than 10 seconds. |
Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside the insulation. Inspect for:
| • | A poor connection --Inspect the ECM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections. |
| • | A damaged harness--Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ECM, turn the ignition ON, and observe a voltmeter connected to the 58X reference circuit at the ECM harness connector while moving the connectors and the wiring harnesses related to the ECM. A change in voltage will indicate the location of the fault. |
| • | Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Perform an On-Board Diagnostic System Check. Was the check performed? | -- | Go to Step 2 | |
2 |
Is DTC P0337 set? | -- | Go to Step 3 | Go to Step 10 |
3 |
Is the voltage within the value specified? | 1.4 V | Go to Step 4 | Go to Step 5 |
4 | Using a voltmeter, measure the voltage between the CKP sensor wiring harness connector, ECM side, terminal 2 and ground. Is the voltage within the value specified? | 1.4 V | Go to Step 6 | Go to Step 5 |
5 |
Is the voltage within the value specified? | 11-14 V | Go to Step 8 | Go to Step 9 |
6 |
Does the voltage fluctuate between the specified range? | 1.3-1.6 V | Go to Diagnostic Aids | Go to Step 7 |
7 |
Did you complete the replacement? | -- | Go to Step 10 | -- |
8 | Inspect the CKP sensor high and low circuits for an open, short to ground, or voltage and repair as needed. Did you find and correct the condition? | -- | Go to Step 10 | -- |
9 |
Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the scan tool indicate that this diagnostic ran and passed? | - | Go to Step 11 | Go to Step 2 |
11 | Are any DTCs displayed that have not been diagnosed? | - | Go to applicable DTC table | System OK |
