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Question

1989 pontiac grand am. quad four engine. engine is


Sent to Car Experts February 27, 2006 9:33 a.m.
1989 pontiac grand am. quad four engine. engine is missing out on one cyl. replaced plugs, checked coils, replaced coil cover. scan shows quad driver 1 low. quad driver 2 high. rough idle, miss x1. crank sensor ref. voltage low. could this be the ign. modual?

Optional Information:
1998 Pontiac grand am quad four

Already Tried:
replaced plugs. checked coils. replaced coil cover
Customer (name blocked for privacy)
Status: Closed   Value: $15   
Info Request
February 27, 2006 10:00 a.m. (26 minutes and 35 seconds later)
A quad driver module is a semiconductor device capable of controlling four separate outputs. Each output of the QDM is an open collector which when turned on pulls the output to ground. A load is connected between 12 volts and the driver. When the output is turned ON, current flows from the battery, through the load, through the driver to ground. Each QDM has a fault line feedback. A comparison of the driver input and output states is performed. If the input and output are in the same state, a fault will be detected. Each QDM has only one fault line that will detect a fault on any of the four outputs.
Now that you know what a quad driver is and does it would be a good idea to post any codes you may have retrieved to help isolate which of the circuits is at issue here.Once that info is available,the particular circuit will need to be diagnosed using a high impedence multi-meter,lab scope, hand held scan tool or even a test light to check for shorts.Please post the exact codes you retrieved.If you require the instructions for code retrieval,let me know.

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21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
Reply
Sent February 27, 2006 10:20 a.m. (19 minutes and 53 seconds later)
codes listed were 35, 41, 44. on the datastream listings was where i noticed that quad driver 1 was low, and it showed crank sensos ref. voltage at 0, but the car still starts and runs but misses and wont idle untill it is warm.   thank you.......
Customer (name blocked for privacy)
Answer
February 27, 2006 11:00 a.m. (40 minutes and 0 seconds later)
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PictureMichael  -- Auto Service Technician -- 99% Positive Feedback on 597 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
Reply
Sent February 27, 2006 12:00 p.m. (59 minutes and 43 seconds later)
on this grand am, it has no dist. as show in youre diagram. it has a coil on plug setup, with a external crank sensor mounted on front of engine block. do your insts. also apply to this setup?
Customer (name blocked for privacy)
Answer
February 27, 2006 12:35 p.m. (35 minutes and 2 seconds later) 		ACCEPTED Check Mark

OOPS!That was for the 2.5L sorry.The only difference is in the R&R instructions.Fault isolation is the same.

REMOVAL & INSTALLATION


2.3L Engine

See Figure 2

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Fig. 2: View of the Crankshaft Position (CKP) sensor location and mounting—1995 vehicle shown


  1. Disconnect the negative battery cable.

  2. Detach the sensor harness connector at the sensor.

  3. Unfasten the retaining bolt, then remove the sensor from the engine.

To install:

  1. Lubricate a new O-ring with clean engine oil, then position it on the sensor.

  2. Position the sensor into the hole in the engine block.

  3. Install the sensor retaining bolt. Tighten the bolt to 88 inch lbs. (10 Nm).

  4. Engage the sensor harness connector.

  5. Connect the negative battery cable

Images available only to Customers.



__________________
"It is much wiser and cost efficient to ask a question than to stumble blindly through your auto repairs".Please Click Accept if my answer was helpful.

PictureMichael  -- Auto Service Technician -- 99% Positive Feedback on 597 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.

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