---
title: Throttle Position Sensor (APPS) Circuitry
description: Comprehensive diagnostic guide for the APPS (Accelerator Pedal Position Sensor) circuit. Includes a detailed pinout from the pedal to the ECM and troubleshooting steps for 35-pin connector corrosion, spread terminals, and voltage instability.
---
[Skip to content](https://service.battlemotors.com/knowledge/throttle-position-sensor-apps-circuitry#main-content)
English
Show submenu for translations
Open main navigation
Close main navigation
- English
Show submenu for translations
- Contact us
Contact us
Find answers on your own time, 24/7.
- There are no suggestions because the search field is empty.
1. [Help Center](https://service.battlemotors.com/knowledge?hsLang=en)
2. [Battle Motors ICE Units](https://service.battlemotors.com/knowledge/battle-motors-ice-units?hsLang=en)
# Throttle Position Sensor (APPS) Circuitry
## The purpose of this document is to detail the Accelerator Pedal Position Sensor (APPS) circuit layout and provide a comprehensive pinout for diagnostic tracing. This guide identifies common failure points and connection junctions between the pedal and the Engine Control Module (ECM).
### Tools Required
- Digital Multimeter (DMM)
- Pin Projection/Terminal Tension Gauges (to check for spread terminals)
- Contact Cleaner and Dielectric Grease
- Torque Wrench (for battery cable verification)
### Vehicle Preparation
1. **Safety**: Ensure the vehicle is parked, wheels chocked, and the ignition is in the OFF position before disconnecting any ECM or chassis connectors.
2. **Schematic Reference**: If the vehicle is a Dual Drive configuration, you must refer to **Schematic 080A-0609** for additional harness routing.
#### Part 1: Circuit Path and Pinout Matrix
The APPS signal travels through five primary connection points. Use the table below to perform continuity and resistance checks across the harness.
| **Wire Number** | **APPS Cavity** | **Extension Harness (1 or 2)** | **102-Pin Floor Pass-Through** | **35-Pin Chassis/ECM** | **96-Pin ECM Connector** |
| --- | --- | --- | --- | --- | --- |
| **Wire 002** | C | C (Conn 1) | 67 | 2 | 9 |
| **Wire 003** | A | B (Conn 1) | 68 | 3 | 10 |
| **Wire 004** | B | A (Conn 1) | 73 | 4 | 33 |
| **Wire 008** | D | C (Conn 2) | 93 | 6 | 8 |
| **Wire 009** | E | B (Conn 2) | 76 | 5 | 61 |
| **Wire 010** | F | A (Conn 2) | 94 | 12 | 64 |
#### Part 2: Sequential Connector Locations
1. **APPS**: 6-pin connector directly at the pedal.
2. **APPS Extension**: Two 3-pin connectors at the end of the pedal harness.
3. **Floor Connector**: 102-pin pass-through.
4. **Chassis-to-ECM**: 35-pin connector located between the frame and the left side of the transmission.
5. **ECM**: 96-pin main engine controller interface.
### Common Issues and Diagnosis
**1. Corrosion at the 35-Pin Connector** Located near the transmission, this connector is a high-traffic area for moisture and road salt.
- **Symptom**: High resistance or open circuit fault codes.
- **Action**: Inspect pins for green corrosion or moisture intrusion. Clean and apply dielectric grease.
**2. Terminal Tension (Spread Pins)** Forceful pulling on the APPS extension harness can "spread" the female terminals at the 6-pin pedal connector.
- **Symptom**: Intermittent "dead pedal" or erratic signal codes.
- **Action**: Use a terminal tension tool to verify a tight fit. Replace the connector shell/terminals if tension is lost.
**3. System-Wide Voltage Stability** The APPS is highly sensitive to voltage "noise." Loose battery or ground cables are the primary culprit for ghost codes.
- **Checkpoints**:
- Batteries, Alternator, and Starter terminals.
- Cab pass-through studs (interior and exterior).
- Main Cab Power Solenoid (behind interior fuse panel).
- **Crucial**: Check the Orange and Red battery cables on the rear of the in-cab fuse panel.
- [Battle Motors ICE Units](https://service.battlemotors.com/knowledge/battle-motors-ice-units?hsLang=en)
- [Battle Motors Units](https://service.battlemotors.com/knowledge/battle-motors-units?hsLang=en#main-content)
- [Steering](https://service.battlemotors.com/knowledge/battle-motors-units?hsLang=en#steering)
- [Battle Motors BEV Units](https://service.battlemotors.com/knowledge/battle-motors-bev-units?hsLang=en)
- [Battle Motors Units with Digital Dash](https://service.battlemotors.com/knowledge/battle-motors-units-with-digital-dash?hsLang=en)
[](http://battlemotors.com)
[mailto:email@email.com](mailto:email@email.com)
Copyright © 2026, Battle Motors