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Idle Validation Switch Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 431 PID: S230 SPN: 558 FMI: 2 LAMP: Yellow SRT: |
Idle validation signals indicate no voltage detected simultaneously on both idle and off-idle pins. |
No effect on performance but loss of idle validation. |
 Idle Validation Switch Circuit
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Circuit Description
The idle validation switch is used by the electronic control module (ECM) to indicate when the accelerator pedal is released (on-idle) or depressed (off-idle). The switch is adjusted by the accelerator pedal manufacturers to switch from on-idle to off-idle at the correct accelerator pedal position.
Component Location
The idle validation switch is located on the accelerator pedal assembly.
Shop Talk
This fault code is usually caused by a loose connection, uncalibrated accelerator pedal, or miswired idle validation switch.
A bad ground on pin A of the idle validation switch can also cause this fault.
Refer to Troubleshooting Fault Code t05-431
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