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P0320-NO CRANK REFERENCE SIGNAL AT PCM —
TEST
2
Turn the ignition off.
With the DRBIII lab scope probe and the Miller special tool #6801, backprobe the
CKP Signal circuit in the PCM harness connector.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Turn the ignition on. (do not start or crank the engine)
Observe the lab scope screen.
Look for any pulses generated by the CKP Sensor.
Did the CKP Sensor generate any pulses?
Yes → Replace the Crankshaft Position Sensor.
→ Go To 3
No
3
NOTE: An intermittent failure with the Cam Position Sensor may cause the
P0320 code to set.
Turn the ignition off.
With the DRBIII as a Dual Channel Lab Scope and the Miller special tool #6801,
backprobe the (K44) CMP Signal circuit in the CMP Sensor connector and the PCM
harness connector.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Ignition on, engine not running.
Wiggle the related wire harness and gently tap on the Cam Position Sensor.
Monitor the lab scope screen.
Start the engine.
Lightly tap on the CMP Sensor and wiggle the related wire harness.
Observe the lab scope screen, looking for any erratic pulses generated by the CMP
Sensor.
Did the CMP Sensor generate any pulses?
Yes → Carefully inspect the wire harness and connections, repair as
→ Go To 4
No
4
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K7) 8-volt Supply circuit in the CKP Sensor harness
connector.
Is the voltage between 7.5 and 8.5 volts?
Yes → Go To 5
→ Go To 12
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
necessary, if ok, replace the Cam Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
103
Continued
APPLICABILITY
All
All
All
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