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Old 02-19-2014, 10:13 AM
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Canshaft position sensor

I have a 2002 wrangler sport with 4.0L automatic. I recently swapped my block for one from a 2006 wrangler. I also had to swap the camshaft position sensor assembly because the 06 wiring harness connector didn't match my 02. I had no way to ensure that my sensor was aligned correctly when installed.
How do I calibrate the sensor? Haynes manual says to use a scan tool but doesn't describe the process.
Thanks in advance for any help.

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Old 02-19-2014, 10:28 AM   #2
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INSTALLATION - 4.0L
SENSOR ONLY - 4.0L
The Camshaft Position Sensor (CMP) on the 4.0L
6–cylinder engine is bolted to the top of the oil pump
drive shaft assembly (Fig. 12). The sensor and drive
shaft assembly is located on the right side of the
engine near the oil filter (Fig. 13).
(1) Install sensor to oil pump drive.
(2) Install 2 sensor mounting bolts and tighten to
2 Nm (15 in. lbs.) torque.
(3) Connect electrical connector to CMP sensor.
OIL PUMP DRIVE AND SENSOR - 4.0L
(1) Clean oil pump drive mounting hole area of
engine block.
(2) Install new oil pump drive-to-engine block gasket.
(3) Temporarily install a toothpick or similar tool
through access hole at side of oil pump drive housing.
Align toothpick into mating hole on pulse ring (Fig.
14).
(4) Install oil pump drive into engine while aligning
into slot on oil pump. Rotate oil pump drive back
to its original position and install hold-down clamp
and bolt. Finger tighten bolt. Do not do a final tightening
of bolt at this time.
(5) If engine crankshaft or camshaft has been
rotated, such as during engine tear-down, CMP sensor
relationship must be reestablished.
(a) Remove ignition coil rail assembly. Refer to
Ignition Coil Removal/Installation.
(b) Remove cylinder number 1 spark plug.
(c) Hold a finger over the open spark plug hole.
Rotate engine at vibration dampener bolt until
compression (pressure) is felt.
(d) Slowly continue to rotate engine. Do this
until timing index mark on vibration damper pulley
aligns with top dead center (TDC) mark (0
degree) on timing degree scale (Fig. 15). Always
rotate engine in direction of normal rotation. Do
not rotate engine backward to align timing marks.
(e) Install oil pump drive into engine while
aligning into slot on oil pump. If pump drive will
not drop down flush to engine block, the oil pump
slot is not aligned. Remove oil pump drive and
align slot in oil pump to shaft at bottom of drive.
Install into engine. Rotate oil pump drive back to
its original position and install hold-down clamp
and bolt. Finger tighten bolt. Do not do a final
tightening of bolt at this time.
(f) Remove toothpick from housing.
(6) Install sensor to oil pump drive. After installation,
the CMP sensor should face rear of engine 0.
(7) Install 2 sensor mounting bolts and tighten to
2 Nm (15 in. lbs.) torque.
(8) Connect electrical connector to CMP sensor.
(9) If removed, install spark plug and ignition coil
rail.
To verify correct rotational position of oil pump
drive, the DRB scan tool must be used.
WARNING: WHEN PERFORMING THE FOLLOWING
TEST, THE ENGINE WILL BE RUNNING. BE CAREFUL
NOT TO STAND IN LINE WITH THE FAN
BLADES OR FAN BELT. DO NOT WEAR LOOSE
CLOTHING.
(10) Connect DRB scan tool to data link connector.
The data link connector is located in passenger compartment,
below and to left of steering column.
(11) Gain access to SET SYNC screen on DRB.
(12) Follow directions on DRB screen and start
engine. Bring to operating temperature (engine must
be in “closed loop” mode).
(13) With engine running at idle speed, the words
IN RANGE should appear on screen along with 0.
This indicates correct position of oil pump drive.
(14) If a plus (+) or a minus (-) is displayed next to
degree number, and/or the degree displayed is not
zero, loosen but do not remove hold-down clamp bolt.
Rotate oil pump drive until IN RANGE appears on
screen. Continue to rotate oil pump drive until
achieving as close to 0 as possible.
The degree scale on SET SYNC screen of DRB is
referring to fuel synchronization only. It is not
referring to ignition timing. Because of this, do
not attempt to adjust ignition timing using this
method. Rotating oil pump drive will have no effect
on ignition timing. All ignition timing values are controlled
by powertrain control module (PCM).
(15) Tighten hold-down clamp bolt to 23 Nm (17
ft. lbs.) torque.

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Old 02-19-2014, 11:18 PM   #3
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I think using a toothpick describes the '04 & earlier unit. For '05 & '06 use this link. Then there is a link to a video in there.

Setting the OPDA with photos
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Old 02-19-2014, 11:59 PM   #4
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I think using a toothpick takes skill and is a way of life.
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Old 02-20-2014, 07:29 AM   #5
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If he has an 02 tj with an 02 computer and an 05 or 06 long block he SHOULD be using the sensors designed to work with the 02 computer

Using newer sensors with an older computer is problematic at best

Swap the mechanical block but retain the old wiring and sensors for any sensors that changed over the years
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Old 02-20-2014, 07:37 AM   #6
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Quote:
Originally Posted by Digger84 View Post
If he has an 02 tj with an 02 computer and an 05 or 06 long block he SHOULD be using the sensors designed to work with the 02 computer

Using newer sensors with an older computer is problematic at best

Swap the mechanical block but retain the old wiring and sensors for any sensors that changed over the years
HUH? that's what he is doing!! Just wanted the info on how to calibrate the cam shaft sesor sice he DID swap the 2002 sensor into the 06 block
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Old 02-20-2014, 08:26 AM   #7
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A couple months ago I installed a new long block. This required installing the OPDA and cam sensor from the old block. For the installation I followed the FSM procedure which is posted above. To sync the sensor I:
Start engine and warm up.
While running rotate the OPDA counterclockwise till the idle rhythm changes.
Rotate clockwise past smooth idle and continue till rhythm changes again.
Place OPDA in the middle of these two points. This is a good baseline.
Now clear any codes and drive Jeep a few miles if no codes its good. If a cam pos sensor code trips move the OPDA couple degrees one way or the other, reset codes, and drive again. It sounds like alot of work but if you have a good ear the baseline will be pretty close.
I took it in to the dealership a few weeks later and had it checked on the DRB scan tool. I paid $98 for the tech to tell me I did a good job. He didn't adjust it at all. Was I lucky? I used the same method when the pin that holds the cam gear sheared on his original OPDA and had to buy a new one. Paid $100 or so to have it verified then as well. I can't say this works for everyone but I won't be paying a third time.
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Old 02-20-2014, 01:45 PM   #8
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I stand corrected. Just misread it. Digger has it right.

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