P1230 – Throttle Position Sensor 1 and 2 Circuit
Sum Out of Range.
Fault symptom
• CHECK ENGINE.
• Idling speed incorrect.
• Starting problems, especially when engine is cold
• Cruise control not working.
As per the WIS, there are 5 sensors on the 5V circuit, however it comprises only 4 components as 2 of the sensors are contained in the throttle body.
Engine\Trionic T7, 4-cyl Technical description – 5V supply
9-5 (9600) 8 2008
The following sensors are supplied with 5V from control module pins 69 and 46. The two 5V supplies are internally coupled to each other in the throttle body.
• Manifold absolute pressure sensor (431 Located on the intake manifold.)
• Charge air absolute pressure sensor (The absolute pressure sensor 603 is integrated with the temperature sensor 407 in one component. The 407/603 sensor is located on the charge air pipe.)
• Differential pressure sensor, tank (a.k.a. Evap Pressure sensor 585, located on the fuel tank by the fuel pump.)
• Pedal position sensors (Integrated into the throttle body 406)
• Throttle position sensor (Integrated into the throttle body 406)
Diagnostics
A short circuit on the 5V supply will put the throttle in limp-home mode and can be caused by
a fault in the wiring harness or a sensor supplied with 5V. As the two 5V supplies are
internally coupled in the throttle housing, no symptoms will appear if there is a break in just
one of them.
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