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Thread: P-1202 Code

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    thompsdw's Avatar
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    P-1202 Code

    I'm getting a 1202 code after a fresh rebuild. The TOPS valve is clicking normally. I had a used spare front oil pressure switch that I tried, but still get the same code. I'm going to put a new switch in tomorrow, but I'm a little concerned it may have something to do with the rebuild.

    Any ideas????


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    GasResearch-VT.SE's Avatar
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    Quote Originally Posted by thompsdw View Post
    I'm getting a 1202 code after a fresh rebuild. The TOPS valve is clicking normally. I had a used spare front oil pressure switch that I tried, but still get the same code. I'm going to put a new switch in tomorrow, but I'm a little concerned it may have something to do with the rebuild.

    Any ideas????

    Quote Originally Posted by beerdart View Post
    P1202 — —
    Oil tank
    pressure switch
    implausible or
    blow-by valve
    still closed

    Possible cause:
    Damaged oil pressure switch, blow-by valve failure, damaged circuit wires, damaged connector or damaged ECM pins.
    Service action:
    Check for 1.27 to 2.47 ohms between terminals.
    Check if TOPS is connected to wiring harness.
    Check resistance at 0 RPM and above 3500 RPM. At high RPM the resistance should be close to 0 ohm.
    Check for 12 volts on pin 1 of the blow-by valve.
    Beerdart's

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    thompsdw's Avatar
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    Where is the blow-by valve? Or is that the same as the TOPS valve?

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    Moderator beerdart's Avatar
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    Yes they are the same. What year block?
    Quote Originally Posted by thompsdw View Post
    Where is the blow-by valve? Or is that the same as the TOPS valve?

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    thompsdw's Avatar
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    '04.

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    Moderator beerdart's Avatar
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    Make sure you have the correct harness plug on the valve and pressure switch. The switch is one wire and the valve is two.

  7. #7
    thompsdw's Avatar
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    I verified the wiring this morning. The reason I am concerned is that I didn't have the problem before the rebuild. Strange that it would start now. If the TOPS and pressure switch check out, where would I look next? Obstruction in the oil system? Is the switch for high or low pressure???

    Maybe hook up an oil pressure gauge????

  8. #8
    Kiwi spanner handler
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    you can plug it backwards! the release wire clip should face the block not gas tank so check that its an easy mistake.

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    thompsdw's Avatar
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    Thats a great tip. I will check it tonight. Thank you!

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    thompsdw's Avatar
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    That plug was inverted as you suggested. I'm used to these only going on one way, but this one is different. Thanks for the tip.

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