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Diagnostic Procedure

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P0340-CAMSHAFT POSITION SENSOR CIRCUIT DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1 Crank the engine.
Ignition on, engine not running.
With the DRBIII®, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Yes --> Go To 2
No --> Go To 14		 All
2 Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.
Is the voltage between 4.5 and 5.2 volts?
Yes --> Go To 3
No --> Go To 10		 All
3 Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.
Is the voltage between 4.5 and 5.0 volts?
Yes --> Go To 4
No --> Go To 7		 All
4 Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K900) Sensor ground circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 5
No --> Repair the open in the (K900) Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
5 Measure the resistance between the (K44) CMP Signal circuit and the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes --> Repair the short between the (K44) CMP Signal circuit and the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 6		 All
6
NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.
If there are no possible causes remaining, view repair.RepairReplace the Camshaft Position Sensor.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
7 Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.
Is the voltage above 5.2 volts?
Yes --> Repair the short to voltage in the (K44) CMP Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 8		 All
8 Turn the ignition off.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K44) CMP Signal circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 9
No --> Repair the open in the (K44) CMP Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
9 Measure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector.
Is the resistance below 100 ohms?
Yes --> Repair the short to ground in the (K44) CMP Signal circuit
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 13		 All
10 Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.
Is the voltage above 5.3 volts?
Yes --> Repair the short to voltage in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 11		 All
11 Turn the ignition off.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (F856) 5-volt Supply circuit between the CMP Sensor harness connector and the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 12
No --> Repair the open in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
12 Measure the resistance between ground and the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.
Is the resistance below 100 ohms?
Yes --> Repair the short to ground in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 13		 All
13
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
14 Turn the ignition off.
With the DRBIII® lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the CMP 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 lightly tap on the Cam Position Sensor.
Observe the lab scope screen.
Allow the engine to idle.
Observe the lab scope screen.
Did the CMP Sensor generate any erratic pulses?
Yes --> Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 15		 All
15 Turn the ignition off.
With the DRBIII® lab scope probe and the Miller special tool #6801, back probe the (K24) CKP Signal circuit in the CKP 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 lightly tap the Crank Position Sensor.
Observe the lab scope screen.
Allow the engine to idle.
Observe the lab scope screen.
Did the CKP Sensor generate any erratic pulses?
Yes --> Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Test Complete.		 All
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