Pontiac Fiero 1988 Service Manual page 580

DRIVEABILITY A N D EMISSIONS - FUEL INJECTION (PORT) 6E3-1
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SECTION 6E3
IVEAMUTY
AND EMISSIONS
FUEL INJECTION (PORT)
THIS SECTION APPLIES T O :
2.8L L44(P SERIES) VIN C O D E " 9 "
CONTENTS
INTRODUCTION
General Description ...
• • • • • • • • • 4
Diagnostic Procedure
* 4
SECTION A - DIAGNOSTIC CHARTS
Table of Contents « ® » © © ® « ® ® @ # e ® ® ® o » « ©
Engine Components and Wiring
Component Location
ECM Wiring Diagrams
ECM Connector Terminal End View * .
0
Diagnostic Circuit Check
• • • . • • • • • • • o o . .
No "Service Engine Soon" Light
Chart AT 1 • • • • • • • • • • • • • • • • • • « » • • •
No ALDL Data or Won't Flash Code 12
"Service Engine Soon" Light On Steady
Chart ^ \ ~ 2 ® » » » 0 # ® # ® » « ® ® « ® » # « » ® # ® «
Engine Cranks But Won't Run
Chart A-3 (1 of 2) .
Fuel System Diagnosis
Chart A-7 (1 of 4) • • • • • • •
Cold Start Valve Test
CharL^\—9 •
Code 13-Oxygen Sensor (Open Circuit) . . .
Code 14-Coolant Temperature Sensor • . •
Code 15-Coolant Temperature Sensor
Code 21-Throttle Position Sensor (TPS) . . .
Code 22-Throttle Position Sensor (TPS) . . .
Code 23-MAT Sensor (Low Temperature) .
Code 24-Vehicle Speed Sensor (VSS)
Code 25-MAT Sensor (High Temperature) .
Code 32-Exhaust Gas Recirculation (EGR) .
Code 33-MAP Sensor (Signal Voltage High)
Code 34-MAP Sensor (Signal Voltage Low)
Code 35-ldle Speed Error
Code 42-Electronic Spark Timing (EST) . . .
Code 44-Oxygen Sensor Circuit (Lean)
Code 45-Oxygen Sensor Circuit (Rich) . • .
Code 51-PROM Error
Code 52-CALPAK Error
Code 53-System Over Voltage
Code 55-ECM E r r o r • . • • • * < > •
A-1
A-2
A-3
A-5
A-6
A-8
A-10
A-12
A-16
A-24
A-26
A-28
A-30
A-32
A-34
A - 3 6
A-38
A-40
A-42
A-44
A-46
A-48
A^50
A-52
A-54
A-56
A-56
A-56
A-56
SECTION B - SYMPTOMS
Table of Contents B-1
Before Starting B-1
Intermittents • B - 2
Hard Start B - 3
Hesitation, Sag, Stumble B - 3
Surges and/or Chuggle B-4
Lack of Power, Sluggish, or Spongy . . * , « _ « B-4
Detonation/Spark Knock B - 5
Cuts Out, Misses B - 5
Backfire B-6
Poor Fuel Economy ^ . B-6
Dieseling, Run-On • • • • B-6
Rough, Unstable, or Incorrect Idle,
Stalling B-7
Excessive Exhaust Emissions Or Odors B-7
Restricted Exhaust System Check
Chart B-1 * B-8
FUNCTIONAL CHECKS/
DIAGNOSTIC CHARTS
ECM QDR Check
ChartC-1 C 1 - 1 0
Park/Neutral Switch Diagnosis
Chart C-1 A * • o * * < > . . * . . o
C 1 - 1 2
MAP Output Check
Chart C-1 D
......
C 1 - 1 4
Injector Balance Test
Chart C2-A C 2 - 1 6
Ignition System Check
Chart C-4B . . . . . . . . . . . . . . . . . . . . . . . . C4-4
Exhaust Gas Recirculation (EGR) Check
Chart C-7 C 7 - 4
125C Transmission Converter Clutch (TCC)
Chart C-8A C 8 - 4
Manual Transmission (M/T) Shift Light Check
ChartC-8B . . . . . . . . . . . . . . . . . . . . C8-6
A/C Clutch Control Diagnosis
Chart C-10 C 1 0 - 2