@Kajester
What codes come up?
What codes come up?
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I’m sorry I forgot to add this into the post. Since a new battery and clearing all codes only a couple come back. One is for my unplugged symposer and one for the pedal I believe.
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@Kajester
So let's start here as I'm not 100% up to speed. I apologize if you've already answered any of these questions.
Other than the battery (was it age or did it keep dying?) has there been anything else that happened?
Any mods, accidents, recent maintenance that has occurred? Just trying to get a full picture of everything.
First we need to determine the VREF (Voltage Reference) for both APP circuits. Set you DMM to DC and if it's not a model the auto selects the range set it to operate in the 20 Volts.
At the APP/ throttle connector with the ignition set to on measure the voltage coming from the PCM (powertrain control module)
APP 1:
Red lead - PIN 1
Black lead - PIN 3
VREF = ?
APP 2:
Red lead - PIN 6
Black lead - PIN 4
VREF = ?
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From here we can hopefully begin to decide where the issue may be.
The way these sensors return information back to the PCM is like this.
Both sensors are given an operation voltage know as a VREF (voltage reference) this is the 5 VDC + side on the circuit.
The "ground" side of the sensors is known as the SIGRTN (signal return) but actually the 5 VDC - side.
When the throttle connector is hooked up each sensor will return a voltage signal back based on there configuration.
One is "High" which means that as the pedal is depressed the voltage goes from 4.8 VDC all the way down to .25 VDC.
The other is "Low" which performs just the opposite. As the pedal is depressed the voltage goes from .25 VDC to 4.8 VDC.
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The PCM checks these two sensors against each other to determine the position the drivers foot is in. It also acts a safety as a single sensor design could short out and cause a runaway engine condition.
When you step on the throttle and your car goes nuts its because it's trying to protect you. One of these two circuits has something wrong with it. Now we have to find out which.
Start here and report back. We can discuss the next steps afterwards.
J
So let's start here as I'm not 100% up to speed. I apologize if you've already answered any of these questions.
Other than the battery (was it age or did it keep dying?) has there been anything else that happened?
Any mods, accidents, recent maintenance that has occurred? Just trying to get a full picture of everything.
First we need to determine the VREF (Voltage Reference) for both APP circuits. Set you DMM to DC and if it's not a model the auto selects the range set it to operate in the 20 Volts.
At the APP/ throttle connector with the ignition set to on measure the voltage coming from the PCM (powertrain control module)
APP 1:
Red lead - PIN 1
Black lead - PIN 3
VREF = ?
APP 2:
Red lead - PIN 6
Black lead - PIN 4
VREF = ?
From here we can hopefully begin to decide where the issue may be.
The way these sensors return information back to the PCM is like this.
Both sensors are given an operation voltage know as a VREF (voltage reference) this is the 5 VDC + side on the circuit.
The "ground" side of the sensors is known as the SIGRTN (signal return) but actually the 5 VDC - side.
When the throttle connector is hooked up each sensor will return a voltage signal back based on there configuration.
One is "High" which means that as the pedal is depressed the voltage goes from 4.8 VDC all the way down to .25 VDC.
The other is "Low" which performs just the opposite. As the pedal is depressed the voltage goes from .25 VDC to 4.8 VDC.
The PCM checks these two sensors against each other to determine the position the drivers foot is in. It also acts a safety as a single sensor design could short out and cause a runaway engine condition.
When you step on the throttle and your car goes nuts its because it's trying to protect you. One of these two circuits has something wrong with it. Now we have to find out which.
Start here and report back. We can discuss the next steps afterwards.
J
The connector to the BJB (battery junction box) C1035C can get a little bit strange at times. It is the primary connection between the interior & PCM.
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