P0337
P0337-CRANKSHAFT POSITION (CKP) SENSOR VOLTAGE TOO LOWP0337 - Crankshaft Position (CKP) Sensor Voltage Too Low:
WHEN MONITORED
With the key on.
SET CONDITION
Voltage detected at the CKP is below a calibrated value for a calibrated amount of time.
POSSIBLE CAUSES
- CKP sensor
- (K853) 5-Volt supply circuit shorted to (K975) return circuit
- (K853) 5-Volt supply circuit shorted battery negative
- Intermittent condition
- ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. CKP SENSOR
Disconnect the CKP sensor harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance between the (K853) 5-volt supply circuit and the (K24) signal circuit of the sensor.
Q: Is the resistance between 900 and 1100 ohms?
YES: Go To 2
NO: Replace the CKP sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
2. (K853) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K975) RETURN CIRCUIT
Disconnect the ECM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (K853) 5-volt supply circuit and the (K975) return circuit in the sensor connector.
Q: Is the resistance greater than 100k Ohms?
YES: Go To 3
NO: Repair the short circuit or replace the engine harness. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
3. (K853) 5-VOLT SUPPLY CIRCUIT SHORTED BATTERY NEGATIVE
Measure the resistance between the (K853) 5-volt supply circuit and battery negative.
Q: Is the resistance greater than 100k Ohms?
YES: Go To 4
NO: Repair the short circuit or replace the engine harness. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
4. ECM
Reconnect the ECM harness connectors.
Ignition on, engine not running.
Connect a jumper wire between the sensor (K853) 5-volt supply circuit in the sensor harness connector 12-volts.
Q: Did DTC P0338 set?
YES: Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
NO: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1