DTC Code Help - C1284 and P1000 - TheDieselGarage.com
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post #1 of 6 (permalink) Old 03-13-2006, 04:30 PM Thread Starter
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DTC Code Help - C1284 and P1000

Questions on the two codes if I can:

C1284 - Oil Pressure Switch Failure. This pops up on my autoenginuity scanner occassionally. No check engine lights and it appears to run fine. Anyone ever run across this?

P1000 - OBD Systems Readiness Test Not completed - I know what this one means, but on my truck it never goes away. I can run weeks without it clearing. Any thoughts?

Thanks in advance!

Mark

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post #2 of 6 (permalink) Old 03-13-2006, 04:50 PM
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whats P1000 mean?
post #3 of 6 (permalink) Old 03-13-2006, 05:12 PM Thread Starter
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I updated my first post to reflect the definition. In summary, it says your vehicle has not completed an OBD drive cycle and then validated all the emissions stuff is working properly after completing that drive cycle. I would think this should complete within a few days, if not weeks, of daily driving.

Mark

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post #4 of 6 (permalink) Old 03-13-2006, 06:59 PM
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A P1000 could take years to clear if you don't go through all the specific drive points during your drive cycle. This is much more strigent on a gasser but that could be the problem, you may not be hitting all the right parameters to complete the test.
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post #5 of 6 (permalink) Old 03-13-2006, 07:29 PM Thread Starter
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Quote:
Originally Posted by Fast-6.0
A P1000 could take years to clear if you don't go through all the specific drive points during your drive cycle. This is much more strigent on a gasser but that could be the problem, you may not be hitting all the right parameters to complete the test.
Agreed, and tks. I saw them posted elsewhere a while ago. Not sure I ever drive at 43.7 mph, radio on Opera, and left butt cheek slighlty raised. :roflmao:

In reality, they are fairly elaborate if I remember right.

Mark

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post #6 of 6 (permalink) Old 03-14-2006, 01:29 AM
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Did a search...here is the drive Cycle as posted by PSDPlayer:

Description
CAUTION: Strict observance of posted speed limits and attention to driving conditions are mandatory when proceeding through the drive cycle.

Note: Vehicles equipped with power take-off (PTO) or auxiliary idle control must have that system disengaged before the OBD drive cycle is initiated.

The primary intention of the OBD drive cycle is to clear the DTC P1000 and to satisfy the specifications for the Society of Automotive Engineers (SAE) specification J1979. Each OBD monitor must run during the drive cycle.

If the drive cycle is completed and P1000 is not cleared, repeat the entire drive cycle. If a particular step is interrupted, simply repeat the drive mode. If the drive cycle is interrupted with a key-off, only drive modes that were incomplete must be run.

Rough road conditions may prevent certain steady state conditions and steady accelerations from validating the transmission and load-related monitors.

Drive Cycle Procedure:
Key ON. Do not crank until the WAIT TO START light cycles, or at least 10 seconds, whichever occurs first.
Start the engine. Idle in PARK or NEUTRAL for 40 seconds.
Before continuing, engine oil temperature (EOT) must exceed 60°C (140°F).
The following outlines the appropriate conditions for running certain OBD monitors that require the engine to be under load:
Accelerate steadily to third gear (M/T use fourth gear) and hold at 1,500 RPM for 3 seconds. Accelerate steadily from 56 km/h (35 mph) to 105 km/h (65 mph) over approximately 15 seconds (M/T 11 seconds minimum).
Repeat Step 4.a. three times while maintaining the conditions in Step 4.a.
Before proceeding, turn all accessories off and disengage tow/haul/overdrive cancel.
Idle the vehicle for 20 seconds in PARK or NEUTRAL.
Key OFF.
Start the engine. Idle in PARK or NEUTRAL for 40 seconds.
Repeat the Quick Test.
Note: If P1000 is present after running the drive cycle:

Repeat Step 4.a., being certain to maintain a minimum mass fuel desired (MFDES) of 35 mg/stroke above 2,000 RPM for 11 seconds. Also, maintain a minimum MFDES of 30 mg/stroke above 2,800 RPM for at least 6 seconds.
Repeat Step 8. MFDES must remain below 12 mg/stroke for 11 consecutive seconds.

Hope that Helps...
Loki

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