Electronic Fuel Injected Engines
1989
24-01-71 Fuel System Diagnosis 24-01-71
ELECTRONIC FUEL INJECTED ENGINES (Continued)
1989
24-01-72 Fuel System Diagnosis 24-01-72
ELECTRONIC FUEL INJECTED ENGINES (Continued)
QUICK TEST INDEX
QUICK TEST PAGE 24-01-
ECA Inputs and Sensors 75
ECA Outputs 75
Input/Output Relationship Chart 76
ECA Connector Pin Usage 73
Quick Test Description 77
Quick Test
Step 1.0 Visual Check Vehicle Preparation 78
Step 2.0 Equipment Hookup 79
Step 3.0 Key On Engine Off Self-Test 82
Step 4.0 Engine Running Self-Test 84
Step 5.0 Continuous Self-Test 86
Step 6.0 Switch Monitor Test (Vehicles built after 11/2/87 only) 89
APPENDIX Self-Test
Self-Test Description 91
Code Output Format 92
Self-Test With STAR Tester 93
Self-Test With Analog Voltmeter 94
DIAGNOSTIC AIDS
Continuous Monitor Test (Wiggle Test) 95
Failure Mode Effects Management (FMEM) 96
"Check Engine" Light (Malfunction Indicator Light) 101
Test Equipment 102
1989
24-01-73 Fuel System Diagnosis 24-01-73
ELECTRONIC FUEL INJECTED ENGINES (Continued)
ECA CONNECTOR PIN USAGE
PIN BREAKOUT BOX APPLICATION ABBREVIATION
Vehicles Vehicles Vehicles Built: After 11/2/8/Prior to 11/2/87 Vehicles Built:
Built After Built Prior After 11/2/87/
11/2/87 to 11/2/87 Prior to 11/2/87
1A 51 51* (NU) Malfunction Indicator Lamp MIL
1B 17 17* (51) Self-Test Output STO
1D 38 38 Switch Monitor Lamp (STO) SML
1E 28 28 Throttle Position Sensor TP
1F 30 NU WOT A/C Cut-Off WAC
1G 8 30 Neutral Gear Switch/Clutch Engage Switch NGS & CES
1H 16 23 Engine Coolant Temperature Switch ECT SW
1I 24 24 Electrical Load Unit/TP Sensor ELU/TP
1J 3 NU Brake On-Off Switch BOO
1K 19 NU Power Steering Pressure Switch PSPS
1L 14 NU A/C Pressure Switch ACPS
1M 6 47 Profile Ignition Pickup TACH
1S NU 54 WOT A/C cutoff WAC
1U 36 56 Ignition Timing Advance TADV
1V 44 53 Ground (Manual Transmission Only)/E/L Unit GND/ELU
1W 48 48 Self-Test Input STI
2A 26 19 Reference Voltage VREF
2B 18 18 Vane Air Flow Meter VAF
2C 46 46 Signal Return SIGRTN
2D 29 29 Exhaust Gas Oxygen Sensor EGO
2E 43 27 Vane Air Flow Meter VAF
*For Non-MIL Vehicles
1989
24-01-74 Fuel System Diagnosis 24-01-74
ELECTRONIC FUEL INJECTED ENGINES (Continued)
ECA CONNECTOR PIN USAGE (CONT'D)
PIN BREAKOUT BOX APPLICATION ABBREVIATION
Vehicles Vehicles Vehicles Built: After 11/2/87/Prior to 11/2/87 Vehicles Built:
Built Built After 11/2/87/
After Prior to Prior to 11/2/87
11/2/87 11/2/87
2G 47 NU Throttle Position Sensor TP
2H 45 45 Barometric Pressure Sensor BP
2I 7 7 Engine Coolant Temperature Sensor ECT
2J 25 25 Vane Air Temperature Sensor VAT
2K 31 31 Pressure Regulator Control Solenoid/Canister PRC/CPR
Purge Regulator Solenoid
20 22 NU Canister Purge Regulator Solenoid CPR
2P 32 32 Canister Purge Solenoid CANP
2Q 41 NU Idle Speed Control Solenoid ISC
2R 49 49 Ground GND
3A 20 20 Ground GND
3B 5 5 Starter Switch START
3C 59 59 Fuel Injector (No. 3 & 4) INJ A
3D 2 2 Inhibitor Switch (ATX) INH
3E 58 58 Fuel Injector (No. 1 & 2) INJ B
3G 40 40 Ground GND
31 37 37 Vehicle Power VPWR
3J 1 1 Keep Alive Power KAPWR
NOTE: Vehicles built prior to 11/2/87 use adaptor harness # 007-00026. Vehicles built after 11/2/87 use adaptor harness # 007-00038.
1989
24-01-75 Fuel System Diagnosis 24-01-75
ELECTRONIC FUEL INJECTED ENGINES (Continued)
ECA INPUTS AND SENSORS
ENGINE CONDITION SENSOR(S)
1. Air Conditioning Load A/C Pressure Switch (ACPS)
2. Alternator Load Electrical Load Unit (ELU)
3. Atmospheric Pressure Barometric Pressure Sensor (BP)
4. Deceleration Brake On-Off Switch (BOO)
5. Engine Coolant Temperature Engine Coolant Temperature Sensor (ECT)
6. Engine Cranking Ignition Switch
7. Engine Runnin Power Relay
8. Fuel/Air Ratio Exhaust Gas Oxygen Sensor (EGO)
9. Ignition Timin Ignition Coil
10. Intake Air Temperatur Vane Air Temperature Sensor (VAT)
11. Intake Air Volum Vane Air Flow Meter (VAF)
12. Radiator Coolant Temperature Engine Coolant Temperature Switch (ECT-SW)
13. Self-Test Running Self-Test Input Connector (STI)
14. Throttle Angle Throttle Position Sensor (TP)
15. No Load Clutch Engage Switch (CES) Inhibitor Switch (IS) Neutral Gear Switch (NGS)
ECA OUTPUTS
SYSTEM DEVICE
1. A/C W.O.T Cutoff A/C Cut Relay (ACC)
2. Evaporative Emissions Canister Purge Solenoid (CANP) Canister Purge Regulator Solenoid (CPR)
3. Fuel/Air Ratio Fuel Injectors
4. Fuel Pressure Pressure Regulator Control Solenoid (PRC)
5. Idle Speed Idle Speed Control Solenoid (ISC) *Idle-up Solenoid (E/L only) for Vehicles built prior to 11/2/87
6. Input Switch Monitor Test Self-Test Output Connector (STO)
7. Self-Test Codes Self-Test Output Connector (STO) Malfunction Indication Lamp (MIL)
1989
24-01-76 Fuel System Diagnosis 24-01-76
ELECTRONIC FUEL INJECTED ENGINES (Continued)