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Pin Voltage Chart

PIN VOLTAGE CHART

ECM Pin  Circuit  Volts  Condition 
A1 Blank " "
A2 Air Cond Circuit 10-14 Ignition On
" " 0-1 Engine Running, A/C On
A3 Diagnosis Switch Terminal 10-14 Ignition On
" " 0 (1) Diagnosis Terminal Grounded
A4 Ground (Calif.) " "
A5 5th Switch (Non-Calif.) 10-14 Ign. On (Not In 5th Gear)
" " 0 Ignition On (In 5th Gear)
A6 Ignition (Fail-Safe) Signal 3-5 Engine Cranking
" " 0 Ignition On
A7 Test Terminal 0 (1) Ignition On
A8 Blank " "
A9 Duty Check Terminal " "
A10 Blank " "
A11 Blank " "
A12 Ignition Output Signal 0 Ignition On
" " 2-4 Engine Cranking
A13 Crankshaft Position (CKP) Sensor Volt- meter Deflec.Repeat-ed 0-5 Ignition On, Crankshaft Turned Slowly
A14 Idle Switch (In TP Sensor) 0-1 (2) Ignition On, Throttle Valve Fully Closed
" " 3-5 Ignition On, Throttle Valve Open Above Idle
A15 Vehicle Speed Sensor (VSS) Volt- meter Deflec.Repeat- ed 0 To 3-5 Ignition On, RR Tire Turned Slowly, LR Tire Locked
A16 EGR Temp. (EGRT) Sensor 3.8-4.5 (3) Ignition On
A17 Intake Air Temp. (IAT) Sensor 2.2-3.0 (3) Ignition On
A18 Engine Coolant Temp. (ECT) Sensor 0.5-0.9 (4) Ignition On
A19 Oxygen Sensor (O2S) " (5)
A20 Blank " "
A21 Throttle Position (TP) Sensor 0.5-1.2 (2) Ignition On, Throttle Valve Fully Closed
" " 3.4-4.7 Ignition On, Throttle Valve Fully Open
A22 MAP Sensor 3.6-4.4 Ignition On, Barometric Pressure 30 in. Hg
A23 Sensor Power Source 4.75- 5.25 Ignition On
A24 Sensor Ground " "
B1 Power Source 10-14 Ignition On
B2 Ground " "
B3 Ground " "
B4 Blank " "
B5 EGR Vacuum Sw. Valve (VSV) 10-14 Ignition On
B6 Idle Air Control (IAC) Valve 10-14 Ignition On
B7 Power Source 10-14 Ignition On
B8 Injector Positive " "
B9 Power Source Back-Up Circuit 10-14 Ignition Off & On
B10 Ground " "
B11 Engine Start Switch 6-10 Engine Cranking
" " 0 Engine Not Cranking
B12 Clutch Switch 0 Ignition On, Clutch Pedal Depressed
" " 10-14 Ignition On, Clutch Pedal Released
B13 Malfunction Indicator Light (MIL) 0-1 Ignition On
" " 10-14 Engine Running
B14 Throttle Opener VSV 10-14 Ignition On
B15 Main Relay Ground 0-2 Ignition On
B16 Fuel Pump Relay Ground 0-4 For 3 Seconds After Ign. On
" " 10-14 After 3 Seconds Ignition On
B17 Injector Negative " "
(1) With spare fuse connected to diagnosis switch terminals.
(2) Throttle opener rod drawn in by vacuum pump gauge.
(3) With sensor at ambient Temp. of 68°F (20°C).
(4) With engine coolant Temp. at 176°F (80°C).
(5) See CODE 13 in the TESTS W/CODES article.