Figure 3 – PCM Connectors

NGC Fuel System: Operation & DiagnosisNGC Fuel System: Operation & Diagnosis


Figure 4 – PCM Connector Pin Removal Tool


Figure 5 – Diagnostic Pin Out Box


Figure 6 – PCM Power and Grounds


Figure 7 – 5V Power Supply (three wire analog sensor)


Figure 9 – CMP and CKP Sensors


Figure 10 & 11 – Typical 6 Cyl CKP Trigger and Scope Pattern


Figure 12 & 13 – Typical 6 Cyl CMP Triggers and Scope Pattern


Figure 14 – Superimposed CMP and CKP Scope Patterns


Figure 15 – PCM Digital (switched) Inputs


Figure 17 – 2-Wire Analog Inputs


Figure 32 – Integrated Cruise Control System


Figure 18 – Integrated S/C MUX Switches


Switch Min/Max Voltage Range

Resume / Accell 3.89V – 4.19V

Set or Set / Coast 3.17V – 3.57V

Coast 2.55V – 2.95V

Cancel 1.60V – 2.00V

On / Off 0.60V – 1.15V

Table 1 – Integrated S/C MUX Switches Voltages


Figure 19 – O2 Sensor Signal Circuit


Figure 20 – Ignition Coil (COP) Circuits


Figure 21 – Injector Control Circuits


Figure 22 – BOSS Output Control (dual)


Figure 23 – High-Side Controlled Outputs


Figure 24 – O2 Sensor Heater Circuits


Figure 25 – Charging System Control


Figure 26 – Speed Density Equation (prior to NGC)


Figure 27 – “Model-Based” Fuel Equation (NGC)


Figure 29 – Natural Vacuum Principle Demonstrated


Figure 30 – NVLD Assembly (canister mounted shown)


Figure 31 – NVLD Schematic


Figure 34 – Double Start Override System


Student Learning Objectives:• Identify and explain the hardware differences between the NGC PCM and

previous PCMs• Demonstrate how to use all special tools• Identify, explain and diagnose all engine controller power and ground

supplies, as well as communication networks that are unique to NGC• Identify, explain and diagnose all PCM inputs and outputs that are unique

to NGC• Demonstrate an understanding of the unique differences of the “Model-

Based” fuel strategy on NGC vehicles• Demonstrate an understanding of the unique differences in purge and EGR

strategies• Demonstrate an understanding of the unique differences in accessory

controls• Identify, explain and diagnose the NVLD system

Figure 3 – PCM Connectors

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