P0338
P0338-CRANKSHAFT POSITION (CKP) SENSOR VOLTAGE TOO HIGHP0338 - Crankshaft Position (CKP) Sensor Voltage Too High:
WHEN MONITORED
With the key on.
SET CONDITION
Voltage detected at the CKP is above a calibrated value for a calibrated amount of time.
POSSIBLE CAUSES
- (K853) 5-Volt supply circuit shorted to voltage
- Intermittent condition
- ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. (K853) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connector(s).
Disconnect the CKP sensor harness connector.
Check connectors - Clean/repair as necessary.
Measure voltage between the (K853) 5-volt supply circuit in the sensor harness connector and battery negative.
Q: Is the voltage greater than 1 volt?
YES: Repair or replace the shorted wiring harness. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 2
2. ECM
Reconnect the ECM harness connectors.
Ignition on, engine not running.
Connect a jumper wire between the sensor (K853) 5-volt supply circuit and the sensor (K975) return in the sensor harness connector.
Q: Did DTC P0337 set?
YES: Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1