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Reading codes PO340 and PO300

Tiny
ZUKY
  • MEMBER
  • 1998 SUZUKI SIDEKICK
  • 15,300 MILES
98 sidekick automatic 4x4 idle surges up and down when cold and levels off to a stall out after warm and runs rough and can not drive or it wont go fast enough.I replaced o2 sensors as it needed them for a good while, than the maf and after that a few days it started rough idle, my cat was not even a year old. Now I hear a rattle sound in it like something is bounceing around in it. When I rev the motor it revs good just wont idle right and in drive has no pick up just boggs. Thanks for any help you can spare. Mj
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Monday, August 27th, 2012 AT 11:17 PM

60 Replies

Tiny
ZUKY
  • MEMBER
  • 33 POSTS
1.6 16v motor
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Monday, August 27th, 2012 AT 11:29 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Do you have a multi meter to do some testing? Also does your scan tool read live engine?Data?
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Tuesday, August 28th, 2012 AT 12:08 AM
Tiny
ZUKY
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  • 33 POSTS
Yes I have a muilti meter and my code reader does live engine and data, But im not sure about how to operate the live engine and data
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Wednesday, August 29th, 2012 AT 4:37 PM
Tiny
SATURNTECH9
  • MECHANIC
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Heres the trouble tree for code P0340. WHat make and model scan tool do you have?
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Friday, August 31st, 2012 AT 1:34 AM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
I have a cen-tech 98614 modle, obd2, also where is the cmp located? I cannot find it? Nobody at the local suzuki dealer knew either. Suzuki forum member said it was built in the distributor? That is what you are refering to as pcm?
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Friday, August 31st, 2012 AT 3:10 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Iam not familar with that scan tool but iam sure in the instructions it will tell you how. Cam sensor is in the distrubutor that's why tell you to. Remove the distrbutor cap. Also you remove the pcm but don't unplug it.
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Friday, August 31st, 2012 AT 3:47 AM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Okay so after I remove pcm with plug still on iy which way do I turn it while running test? Clock wise or counter clockwise?
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Friday, August 31st, 2012 AT 5:58 AM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Also how do I know which trans I have? It is auto but 3 or 4 speed I do not know how to tell.
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Friday, August 31st, 2012 AT 6:01 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The only reason your removing the pcm is to. Be able to. Get the wires to it so which ever way is easiest for you to be able to get to the wires. What does it say on your shifter indicator gear position wise?
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Friday, August 31st, 2012 AT 6:09 AM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Positions for drive, are D-2-L
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Friday, August 31st, 2012 AT 6:54 AM
Tiny
SATURNTECH9
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Looks like a 3 speed transmission
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Friday, August 31st, 2012 AT 8:49 AM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Thank you, Now on the trouble tree you sent it says the harness plug I assume the plug on pcm? It says the it has 26 pin, my bplug on pcm is only 7, am I at the right plug?There is no other plug on pcm.
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Friday, August 31st, 2012 AT 4:57 PM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Also maybe a pic of the test plug Im supposed to be running these test from?
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Friday, August 31st, 2012 AT 4:59 PM
Tiny
SATURNTECH9
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Sounds like you found something other then the pcm I posted a diagram of where it is its number 22 in the diagram.I dont have a access to the connector faces and pin outs on the vechile. You would just find the connector thats 26 pin and the other one which they say is 22 pin and count from the end the amount of pin numbers they say which is 3. The wire should be white if you started from the correct end. Let me know what you find.
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Friday, August 31st, 2012 AT 5:21 PM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Well some how were not on same page here, the trouble tree said nothing about being under the dash for anything, It only said to remove pcm and turn it to test it once the testing plug is found, which in fact led me to believe it was in general area under hood, is that last diagram wireing under hood? If so its not very clear, I cannot even blow it up like I could the trouble tree.
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Friday, August 31st, 2012 AT 5:43 PM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
This is what I have been reading
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Friday, August 31st, 2012 AT 5:47 PM
Tiny
SATURNTECH9
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The pcm is under the left side of the dash according to my info. It may seem like it to you its under the hood from the trouble it is not under there.
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Friday, August 31st, 2012 AT 8:01 PM
Tiny
ZUKY
  • MEMBER
  • 33 POSTS
Here is what I found; 2.51 v constant, never drops to 0 with rotation. No short to grn on this white wire.
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Saturday, September 1st, 2012 AT 8:02 PM
Tiny
SATURNTECH9
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Are you talking about the step 2?If so if the voltage is constant you go step 4 which says check for a open in the wire which ever color yours is of no open replace cam sensor.
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Saturday, September 1st, 2012 AT 9:02 PM
Tiny
ZUKY
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  • 33 POSTS
Can the cam sensor be replaced by its self? Or do I have to replace whole distributor?
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Saturday, September 1st, 2012 AT 9:12 PM

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