On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

HA: Natural Gas Fuel Control
Introduction

HA: Pinpoint Tests

Note

This Pinpoint Test is intended to diagnose the following:

HO2S/Heater (9F472)
HO2S Connections
Vacuum Systems
Fuel Injector(s) (9F593)
Harness Circuits: HO2S GND, HO2S, INJ 1-8, VPWR and SIG RTN
Powertrain Control Module (PCM) (12A650)
Natural Gas Module (NG) (9F954)

Pinpoint Test Schematic and Connectors

HO2S CONNECTOR PIN ASSIGNMENT

Signal	Pin	HO2S Heater Ground	Pin	Heater VPWR	Pin	HO2S SIG RTN	Pin
HO2S-11	60	HO2S HTR-11 (GND)	93	VPWR	71	SIG RTN	91
HO2S-12	35	HO2S HTR-12 (GND)	95	VPWR	71	SIG RTN	91
HO2S-21	87	HO2S HTR-21 (GND)	94	VPWR	71	SIG RTN	91
HO2S-22	61	HO2S HTR-22 (GND)	96	VPWR	71	SIG RTN	91

NGV Module 60 Pin Connector

HA: Pinpoint Tests