Chrysler PT Cruiser 2001 Service Manual Supplement page 2630

DRIVEABILITY - GAS
P1391-INTERMITTENT LOSS OF CMP OR CKP —
TEST
3 Turn the ignition off.
Visually inspect the related wire harness connectors. Look for broken, bent,
pushed out, or corroded terminals.
Visually inspect the related wiring harness. Look for any chafed, pierced,
pinched, or partially broken wires.
Note: Make sure the Camshaft Position Sensor and/or the Crankshaft
Position Sensor is tight.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
→ Go To 4
No
4 Turn the ignition off.
Disconnect and remove the camshaft position sensor.
Inspect the target magnet for looseness and/or physical damage.
Is the target magnet free from defects?
Yes → Go To 5
→ Repair/replace tone wheel/pulse ring as necessary.
No
5 If there are no possible causes remaining, view repair.
Repair
6 Turn the ignition off.
With the DRB lab scope, backprobe the CKP signal circuit at the CKP sensor harness
connector using Miller special tool #6801.
Warning: Keep clear of the engine's moving parts.
Start the engine.
Observe the CKP sensor voltage pattern on the lab scope screen.
Are there any signals missing?
Yes → Go To 7
→ Go To 10
No
7 Turn the ignition off.
Visually inspect the related wire harness connectors. Look for broken, bent,
pushed out, or corroded terminals.
Visually inspect the related wiring harness. Look for any chafed, pierced,
pinched, or partially broken wires.
Note: Make sure the Camshaft Position Sensor and/or the Crankshaft
Position Sensor is tight.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
→ Go To 8
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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