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P0340-CMP/CKP POSITION SENSOR CIRCUIT - SIGNAL FREQUENCY
TOO HIGH —
Continued
TEST
6
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit between the CMP Sensor
harness connector and the ECM harness connector.
Is the resistance below 10.0 ohms?
Yes → Go To 7
→ Repair the Sensor Ground circuit for an open.
No
7
Turn the ignition on.
Disconnect the IAT Sensor harness connector.
Disconnect the Camshaft Position Sensor harness connector.
Connect one end of a jumper wire to the IAT Sensor signal circuit in the IAT Sensor
harness connector.
Connect the other end of the jumper wire to the Sensor Ground circuit in the
Camshaft Position Sensor harness connector.
With the DRBIII in Engine, Sensors, read the Intake Air Temp volts.
Is the voltage below 1.0 volt?
Yes → Go To 8
→ Replace and program the ECM in accordance with the Service
No
8
Turn the ignition off.
Remove the CMP Sensor.
Inspect the camshaft for conditions such as loose mounting screws, damage, debris or
cracked teeth.
Is there any evidence of these conditions?
Yes → Repair as necessary.
→ Go To 9
No
9
Turn the ignition off.
With the DRBIII lab scope lead, backprobe the CMP Signal circuit.
Set the DRBIII lab scope settings as follows: Time = 0.1s/Div, 20 volts scale, Offset
= 0.00volts, Probe = X10, Coupling = DC.
While observing the DRBIII display, crank the engine.
NOTE: The DRBIII should display a digital signal (square wave) similar to
that shown in the support material.
Does the DRBIII display an uninterrupted digital signal (square wave)?
Yes → Replace and program the Engine Control Module in accordance
→ Replace the Camshaft Position Sensor in accordance with the
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
79
APPLICABILITY
All
All
All
All
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