Question about 1999 Pontiac Grand Prix
Replaced speed sensor did not fix problem speedo dose not work and will not shift if you clear ode it will shift once is ecm a problem on the 99 gradprix
Check wires and connection.
Posted on Dec 28, 2013
Check harness / wiring for continuity , damage , chaffing, connector contact, etc... from speed sensor to ECM.
Posted on Dec 28, 2013
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Posted on Jan 02, 2017
There is only 1 knock sensor on the engine. Check the connector first, and make sure you are running a decent grade of gas. You may need to replace the sensor if all else is okay
Posted on Jan 15, 2010
On the 3.8 engine it is on the front of the motor by the waterpump. Just unplug it, unbolt it and remove it. On the 3.4 engine, you have to remove the Power steering pump to get to the sensor.
Posted on Aug 11, 2010
Engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set. The reference values given below are measured between ECM terminal 72 and ground... When measuring input / output voltage be careful not to use ECM ground terminals. The ECM will enter fail safe mode once a malfunction is detected and the MI will light up.
Usually, P0118 is indicative of a bad temperature sensor, but doesn't rule out these other possibilities. If you're unsure of how to diagnose a PCM, do not attempt.
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The reference values given below are measured between ECM terminal 72 and ground...
When measuring input / output voltage be careful not to use ECM ground terminals. The ECM will enter fail safe mode once a malfunction is detected and the MI will light up.
Posted on Nov 04, 2010
A speedo control code? Or are you trying to say Speed Control. Does your speedometer work? If your speedoeter works, you are trying to fix the wrong thing. "Speed Control" has to do with your cruise control system, not your speedometer. What code do you have exactly?
Posted on Jan 11, 2011
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