Thanks Bernd,
I appreciate the information.
Rich
-----Original Message-----
From: Bernd D. Ratsch [mailto:bernd@texas.net]
Sent: Monday, September 27, 1999 2:29 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: RE: Failed Emissions (a little long)
- OBD-II Driving Cycle -
A complete driving cycle should perform diagnostics on all systems. A
complete driving cycle can be done in under fifteen minutes.
To perform an OBDII Driving cycle do the following:
(1) Cold Start. In order to be classified as a cold start the engine
coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the
ambient air temperature at startup. Do not leave the key on prior to the
cold start or the heated oxygen sensor diagnostic may not run.
(2) Idle. The engine must be run for two and a half minutes with the air
conditioner on and rear defroster on. The more electrical load you can
apply the better. This will test the O2 heater, Passive Air, Purge "No
Flow", Misfire and if closed loop is achieved, Fuel Trim.
(3) Accelerate. Turn off the air conditioner and all the other loads and
apply half throttle until 88km/hr (55mph) is reached. During this time the
Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
(4) Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3
minutes. During this time the O2 response, air Intrusive, EGR, Purge,
Misfire, and Fuel Trim diagnostics will be performed.
(5) Decelerate. Let off the accelerator pedal. Do not shift, touch the
brake or clutch. It is important to let the vehicle coast along gradually
slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel
Trim diagnostics will be performed.
(6) Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph).
This will perform the same diagnostics as in step 3.
(7) Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five
minutes. During this time, in addition to the diagnostics performed in step
4, the catalyst monitor diagnostics will be performed. If the catalyst is
marginal or the battery has been disconnected, it may take 5 complete
driving cycles to determine the state of the catalyst.
(8) Decelerate. This will perform the same diagnostics as in step 5. Again,
don't press the clutch or brakes or shift gears.
- Bernd
At 02:08 PM 09/27/1999 -0400, you wrote:
Nate,
Never heard of this, but I would like to hear the details on the instruction
sheet.
Rich - Ashburn, VA
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