Jeep XJ. Manual — part 835
Symptom:
P0320-NO CRANK REFERENCE SIGNAL AT PCM
When Monitored and Set Condition:
P0320-NO CRANK REFERENCE SIGNAL AT PCM
When Monitored:
With the ignition on.
Set Condition:
No signal from the crankshaft position sensor is present during engine
cranking, and at least 3 camshaft position sensor signals have occurred.
POSSIBLE CAUSES
CHECKING INTERMITTENT CKP SIGNAL WITH LAB
CHECKING INTERMITTENT CMP SIGNAL WITH LAB
CHECKING INTERMITTENT WIRING WITH LAB SCOPE
INTERMITTENT CONDITION
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5 VOLT SUPPLY CIRCUIT OPEN
5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
CKP SENSOR SIGNAL CIRCUIT SHORTED GROUND
CKP SENSOR SIGNAL CIRCUIT OPEN
CKP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
CKP SENSOR SIGNAL SHORTED TO 8 VOLT SUPPLY CIRCUIT
SENSOR GROUND CIRCUIT OPEN
PCM - 5 VOLT SUPPLY
PCM - CKP SENSOR SIGNAL
CRANKSHAFT POSITION SENSOR
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, read the Current CKP State while cranking the engine.
Does the DRBIII
t display Current CKP State Present while cranking the engine?
All
Yes
→
No
→
101
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
With the DRBIII
t lab scope probe and the Miller special tool #6801, backprobe the
CKP Signal circuit in the PCM harness connector.
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
Turn the ignition on. (do not start the engine)
Observe the lab scope screen.
Look for any pulses generated by the CKP Sensor.
Did the CKP Sensor generate any pulses?
All
Yes
→
Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
3
Turn the ignition off.
With the DRBIII
t lab scope probe and the Miller special tool #6801, backprobe the
CMP Signal circuit in the PCM harness connector.
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
Turn the ignition on. (do not start the engine)
Observe the lab scope screen.
Look for any pulses generated by the CMP Sensor.
Did the CMP Sensor generate any pulses?
All
Yes
→
Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
4
Turn the ignition off.
With the DRBIII
t lab scope probe and the Miller special tool #6801, backprobe the
CKP Signal circuit in the PCM harness connector.
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
Start the engine.
Observe the lab scope screen while wiggling the wiring harness and connectors.
Were there any irregularities in the lab scope pattern?
All
Yes
→
Check the harness connectors carefully. If OK, replace the Crank-
shaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII
t Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
102
DRIVEABILITY - GAS
P0320-NO CRANK REFERENCE SIGNAL AT PCM —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5 Volt Supply circuit in the CKP Sensor harness connector.
Is the voltage between 4.5 and 5.5 volts?
All
Yes
→
No
→
7
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CKP Sensor Signal circuit in the CKP Sensor harness
connector.
Is the voltage between 4.5 and 5.0 volts?
All
Yes
→
No
→
8
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Measure the resistance of the Sensor Ground circuit in the CKP Sensor harness
connector to ground.
Is the resistance below 30 ohms?
All
Yes
→
No
→
Repair the Sensor Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
9
NOTE: Inspect the slots on the flywheel for damage. If a problem is found
repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Measure the resistance of the CKP Sensor Signal circuit in the CKP Sensor harness
connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the CKP Sensor Signal circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
11
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the CKP Sensor Signal circuit between the CKP Sensor
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the CKP Sensor Signal circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
103
DRIVEABILITY - GAS
P0320-NO CRANK REFERENCE SIGNAL AT PCM —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CKP Sensor Signal circuit in the CKP Sensor harness
connector.
Is the voltage above 5.0 volts?
All
Yes
→
Repair the CKP Sensor Signal circuit for a short to battery
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
13
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Measure the resistance between the CKP Sensor Signal circuit and the 8 Volt Supply
circuit in the CKP Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the CKP Sensor Signal circuit shorted to the 8 Volt Supply
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
14
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
15
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Measure the resistance of the 5 Volt Supply circuit in the CKP Sensor harness
connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
16
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit between the CKP Sensor harness
connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
104
DRIVEABILITY - GAS
P0320-NO CRANK REFERENCE SIGNAL AT PCM —
Continued
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