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Chris (aka-Moose)
Chris (aka-Moose), Technician
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Experience:  16 years of experience
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P1300 when diagnosed what is the solution, Discovery 2 Land

Customer Question

P1300 when diagnosed what is the solution
JA: What is the make/model/year of your car?
Customer: Discovery 2 Land Rover
JA: What year is your Discovery?
Customer: 2003
JA: Are you fixing your Discovery yourself? What have you tried so far?
Customer: I discovered it's not moving well
JA: Anything else you want the mechanic to know before I connect you?
Customer: So have serviced the gear but still not going well
JA: How old is the transmission? Have you checked the brake switch?
Customer: No
Submitted: 7 months ago.
Category: Car
Expert:  david craig replied 7 months ago.

Hi Im David, the most probable cause for this is a bad catalytic converter

DTC P1300
Catalyst damaging misfire multiple cylinders Drive cycle C:Signal out of range - above maximum.

Possible causes by suggested order of priority:
^ Fuel pressure too low.
^ Crank synchronization problem
^ Ignition coil fault
^ Fuel contamination.
^ Engine mechanical fault.

Fuel Pressure Too Low.
CHECK THE FOLLOWING:
^ Fuelling adaptions show enrichment.
^ Check fuel pressure with fuel pressure gauge.
POSSIBLE FAULTS
^ Fuel filter blocked.
^ Fuel pressure regulator fault.
^ Fuel pump fault.

Crank Synchronization Problem
CHECK THE FOLLOWING:
^ Sporadic reference mark error count raised.
^ Reset count possibly also raised.
^ Crank sensor fault is set.
POSSIBLE FAULTS
^ Crank sensor wheel physically damaged.
^ Crank sensor out of position.
^ Crank sensor faulty.
DIAGNOSTIC HINTS
^ Raised reset count with a zero reference error count may indicate a 12v supply problem.
^ Diagnose fault with raised ref error count as a crank sensor fault.

Ignition Coil Fault
CHECK THE FOLLOWING:
^ Misfire counts high for all cylinders using coil 2 (1,4,6,7).
^ Misfire counts high for all cylinders using coil 1 (2,3,5,8).
^ Misfire counts high for all cylinders.
POSSIBLE FAULTS
^ Problem with 12v supply to coil pack 2 (cylinders 1,4,7,6).
^ Problem with 12v supply to coil pack 1 (cylinders 2,3,5,8).
^ Problem with 12v supply to both coil packs.
^ Coil pack 2 faulty.
DIAGNOSTIC HINTS
^ Raised misfire counts on paired cylinders 4+7, 2+3, 1+6, 5+8 indicate a problem with one coil drive or secondary circuit.
^ Raised misfire counts on groups of four cylinders 1+4+6+7 or 2+3+5+8 indicate coil pack problems.
^ Raised counts on groups of four cylinders 1+3+5+7 or 2+4+6+8 indicate a bank fuelling problem.

Fuel Contamination.
CHECK THE FOLLOWING:
^ Misfire counts equally high for all cylinders.
^ Fuel pressure measured with fuel pressure gauge reads normal.
^ Abnormal fuelling adaptions.
^ Engine running very rough.
^ Visual check of fuel in fuel line (take sample).
POSSIBLE FAULTS
^ Fuel contaminated.

Engine Mechanical Fault.
CHECK THE FOLLOWING:
^ Raised air flow at idle.Cylinder compressions.
^ Cylinder leakages.
^ Valve timing (Faulty or worn CAM).
^ Spark plug condition - check for oil or carbon fouling.
POSSIBLE FAULTS
^ Valve, Piston or CAM problems causing low engine efficiency.
^ Engine running rich causing carbon deposits on spark plugs.

Expert:  david craig replied 7 months ago.

just checking in to see how its going

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