Chrysler PT Cruiser 2001 Service Manual Supplement page 2632

DRIVEABILITY - GAS
P1391-INTERMITTENT LOSS OF CMP OR CKP —
TEST
13 Turn the ignition off.
Connect the DRB lab scope to the CMP signal circuit. For best results, backprobe at
the PCM harness using Miller special tool #6801.
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?
Yes → Check harness and connectors carefully. If OK, replace the
No
14 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced,
pinched, or partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent,
pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
Yes → Repair wiring harness/connectors as necessary.
No
15 Turn the ignition off.
Connect the DRB lab scope to the CKP signal circuit. For best results, backprobe at
the PCM harness connector using Miller special tool #6801.
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?
Yes → Check harness and connectors carefully. If OK, replace the
No
ACTION
Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 14
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 15
Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Test Complete.
Continued
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APPLICABILITY
All
All
All