Pontiac Fiero 1988 Service Manual page 452

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-1
SECTION 6E2
DRIVEABILITY AND EMISSIONS
FUEL INJECTION (TBI)
THIS SECTION APPLIES TO:
231 LR8 (P SERIES) VIN CODE "R"
CONTENTS
INTRODUCTION
General Description 4
Diagnostic Procedure . . • 4
SECTION A - DIAGNOSTIC CHARTS
Table of Contents
Engine Components and Wiring
Component Locations
Wiring Diagrams (1 of 3) • • • •
ECM Terminal End View
Diagnostic Circuit Check
No "ServiceEngine Soon" Light
Chart A-1
No ALDL Data, Won't Flash Code 1 2 , "Service
Engine Soon" Light On Steady
Chart A-2 • • •
Engine Cranks But Won't Run
Chart A-3(1 o f 3)
Fuel Pump Relay Circuit
Chart A-5
Fuel System Diagnosis
ChartA-7(1 of2)
Code 13-Oxygen Sensor Circuit
Code 14-Coolant Temp. Sensor Circuit
Code 15-Coolant Temp. Sensor Circuit
Code 21-TPS (Signal Voltage High)
Code 22-TPS (Signal Voltage Low)
Code 23-MAT Sensor (Temperature Low)
Code 24-Vehicle Speed Sensor (VSS)
Code 25-MAT Sensor (Temperature High)
Code 33-MAP Sensor (Signal Voltage H i g h ) . . .
Code 34-MAP Sensor (Signal Voltage Low) . . .
Code 35-ldle Speed Error
C o d e 4 2 - E S T . . . . . .
Code 44-Oxygen Sensor Circuit (Lean)
Code 45-Oxygen Sensor Circuit (Rich)
Code 51-Faulty PROM
Code 53-System Over Voltage . *
• © • © <
« © © •
• • o • • e *
A-1
A-2
A-3
A-6
A 10
A-12
A-14
A-20
A-22
A-26
A-28
A-30
A-32
A-34
A-36
A-38
A-40
A-42
A-44
A-46
A-48
A-50
A-52
A-54
A-54
SECTION B - SYMPTOMS
Table of Contents
Before Starting
Intermittents
Hard Start
Surges and/or Chuggle
Lack of Power, Sluggish, or Spongy <
Detonation/Spark Knock
© ® © O Q ©
Hesitation, Sag, Stumble
Cuts Out, Misses • •
Poor Fuel Economy
Rough, Unstable, or Incorrect Idle,
Stalling
Above Normal Emissions(Odors) .
Dieseling, Run-On
Backfire
Restricted Exhaust System Check
Chart B** 1
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o
o 9
« c
B-1
B-1
B-2
B-2
3-3
B-3
8-4
B-4
B-4
B c t 5
B-S
B-6
B-6
B-6
B-7
FUNCTIONAL CHECKS/
DIAGNOSTIC CHARTS
Park/Neutral Switch Diagnosis
ChartC-1A C1-10
MAP Output Check
Chart C-1D C1-12
"DIS" Misfire At Idle
Chart C-4D-1 C4-6
"DIS" Misfire Under Load
Chart C-4D-2 C4-8
Exhaust Gas Recirculation (EGR) Check
(Non-ECM Controlled)
Chart C-7A C7-4
125C Transmission Converter Clutch (TCC)
Chart C-8A C8-4
Manual Transmission (M/T) Shift Light Check
Chart C8-B C8-6
A/C Clutch Control
Chart C-10
CI0-2
Engine Cooling Fan
Chart C-12 C12-2