Page 623 of 5267

When Monitored:
With the key on.
Set Condition:
The voltage detected at the Crankshaft position sensor is below a calibrated value.
Possible Causes
CKP SENSOR
(K24) SIGNAL CIRCUIT OPEN
(K853) 5-VOLT SUPPLY CIRCUIT OPEN
(K975) RETURN CIRCUIT OPEN
(K24) SIGNAL CIRCUIT SHORTED TO (K975) RETURN CIRCUIT
(K853) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K975) RETURN CIRCUIT
(K24) SIGNAL CIRCUIT SHORTED TO(K853) 5-VOLT SUPPLY CIRCUIT
(K24) SIGNAL CIRCUIT SHORTED TO GROUND
(K853) 5-VOLT SUPPLY CIRCUIT SHORTED TO 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.
NOTE: 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?
Ye s>>
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)
Page 627 of 5267

9.(K24) SIGNAL CIRCUIT SHORTED TO (K853) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (K24) signal circuit and the (K853)
5-volt supply circuit in the sensor connector.
Is the resistance greater than 100k Ohms?
Ye s>>
Go To 10
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)
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?
Ye s>>
Refer to the INTERMITTENT CONDITION Symptom (Diag-
nostic 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)
Page 629 of 5267

When Monitored:
With the key on.
Set Condition:
Voltage detected at the CKP is below acalibrated value for a calibrated amountoftime.
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?
Ye s>>
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?
Ye s>>
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)
Page 630 of 5267
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?
Ye s>>
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?
Ye s>>
Refer to the INTERMITTENT CONDITION Symptom (Diag-
nostic 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)
Page 632 of 5267

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. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
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.
Is the voltage greater than 1 volt?
Ye s>>
Repair or replace the shorted wiring harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
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.
Did DTC P0337 set?
Ye s>>
Refer to the INTERMITTENT CONDITION Symptom (Diag-
nostic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS 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)
Page 634 of 5267

When Monitored:
While the engine is running.
Set Condition:
The ECM no longer detects a signal from the Engine Position Sensor.
Possible Causes
INJECTOR DTC’S PRESENT
OTHER DTC’S
CAMSHAFT SENSOR
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(K916) RETURN CIRCUIT OPEN
(K44) SIGNAL CIRCUIT SHORTED TO GROUND
(K44) SIGNAL CIRCUIT SHORTED TO SUPPLY (F855) CIRCUIT
(K44) SIGNAL CIRCUIT SHORTED TO (K916) RETURN CIRCUIT
(K44) SIGNAL CIRCUIT SHORT TO VOLTAGE
ECM
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.INJECTOR DTC’S PRESENT
With the scan tool, read DTCs.
Do you have a DTC for P2146 or P2149?
Ye s>>
Repair injector DTC’s first.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No>>
Go To 2
2.OTHER DTC’S
With the scan tool, read DTCs.
Is any other DTC’s present?
Ye s>>
Repair other DTC’s first.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No>>
Go To 3
Page 640 of 5267

When Monitored:
While the engine is running.
Set Condition:
The ECM no longer detects a signal from the Engine Position Sensor.
Possible Causes
INJECTOR DTC’S PRESENT
OTHER DTC’S
CAMSHAFT SENSOR
(K44) SIGNAL CIRCUIT OPEN
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(K916) RETURN CIRCUIT OPEN
(K44) SIGNAL CIRCUIT SHORTED TO GROUND
(K44) SIGNAL CIRCUIT SHORTED TO (F855) 5-VOLT SUPPLY CIRCUIT
(K44) SIGNAL CIRCUIT SHORTED TO (K916) RETURN CIRCUIT
(K44) SIGNAL CIRCUIT SHORT TO VOLTAGE
ECM
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.INJECTOR DTC’S PRESENT
With the scan tool, read DTCs.
Do you have a DTC for P2146 or P2149?
Ye s>>
Repair injector DTC’s first.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No>>
Go To 2
2.OTHER DTC’S
With the scan tool, read DTCs.
Is any other DTC’s present?
Ye s>>
Repair other DTC’s first.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No>>
Go To 3
Page 648 of 5267

When Monitored:
While the engine is running.
Set Condition:
Fuel level does not change by a calibrated amount over a calibrated amount oftime.
Possible Causes
EXTERNAL DAMAGE TO FUEL TANK
FUEL LEVEL SENSOR
INSIDE OF FUEL TANK OBSTRUCTED DAMAGED
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.EXTERNAL DAMAGE TO FUEL TANK
Visually inspect the fuel tank for external damage.
Is the fuel tank damaged from the outside?
Ye s>>
Fix or replace the fuel tank.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No>>
Go To 2
2.FUEL LEVEL SENSOR
Disconnect the wiring harness from the fuel level sensor.
NOTE: Check connectors - Clean/repair as necessary.
Remove the fuel level sensor from the fuel tank.
Does the fuel level float move freely?
Ye s>>
Go To 3
No>>
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
3.FUEL LEVEL SENSOR
Measure the resistance between the sensor (N4) signal circuit and (K900) return circuit while moving the sensor
float arm.
Does the resistance level change as you move the sensor arm?
Ye s>>
Go To 4
No>>
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)