Dodge Ram Truck 1500-2500-3500. Manual — part 1077

P0336-CRANKSHAFT POSITION (CKP) SENSOR SIGNAL (CONTINUED)

10.

ECM

Reconnect the ECM harness connectors.

Ignition on, engine not running.

With the scan tool, erase DTCs.

Connect a jumper wire between the sensor supply circuit and the sen-
sor return circuit in the sensor harness connector.

Did DTC P0337 set?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom

(Diagnostic Procedure).

(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No

>> Replace the ECM.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0337-CRANKSHAFT POSITION (CKP) SENSOR VOLTAGE TOO LOW

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1231

P0337-CRANKSHAFT POSITION (CKP) SENSOR VOLTAGE TOO LOW (CONTINUED)

For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)

For a complete wiring diagram Refer to Section 8W.

•

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. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

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.

Is the resistance between 900 and 1100 ohms?

Yes

>> Go To 2

No

>> Replace the CKP sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

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.

Is the resistance greater than 100k Ohms?

Yes

>> Go To 3

No

>> Repair the short circuit or replace the engine harness.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0337-CRANKSHAFT POSITION (CKP) SENSOR VOLTAGE TOO LOW (CONTINUED)

3.

(K853) 5-VOLT SUPPLY CIRCUIT SHORTED BATTERY NEGATIVE

Measure the resistance between the (K853) 5-volt supply circuit and
battery negative.

Is the resistance greater than 100k Ohms?

Yes

>> Go To 4

No

>> Repair the short circuit or replace the engine harness.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

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.

Did DTC P0338 set?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom

(Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNO-
SIS AND TESTING)

No

>> Replace the ECM.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1233