*For reference only.
Checking pin voltages at ECU determines whether ECU is receiving and transmitting proper voltage signals. Charts may also help determine if ECU harness has an electrical short or open.
Figure 1.NOTE: Unless stated otherwise in testing procedures, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate.
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Terminals
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Component To Be Tested & Condition (1)
|
Checks | Specifications |
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1 & 7
|
Hall Control (AEG) | Voltage w/ignition on | Battery Voltage |
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2 & 7
|
Temp Sensor II | Resistance | See Figure #2 below |
|
4* & 7
|
Deceleration Switch Full Throttle Switch |
Idle speed position. |
0 ohms 0 ohms |
|
5 & 7
|
Oxygen Sensor | Disconnected & grounded Connected |
0 ohms Open Circuit |
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6 & 19
|
Intake Air Sensor (Air Flow Meter) | Resistance | ~560 ohms |
|
11 & 7
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Fuel Injector - Cyl. #4 | Injector & Wiring | ~16.0 - 16.4 ohms |
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12 & 7
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Fuel Injector - Cyl. #3 | Injector & Wiring | ~16.0 - 16.4 ohms |
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13 & 7
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Fuel Pump Relay - Terminal 87 | Ignition On - Function of relay. | Battery Voltage |
|
14 & 6
|
Temp Sensor I | Resistance | See Figure #2 below |
|
15 & 19
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Intake Air Sensor (Air Flow Meter) | Move plate to check resistance. | Variable ohms as plate moves. |
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20* & 25 Bridged
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Fuel Pump Relay - Terminal 86* | Ignition On - Function of relay. | Fuel pump must run. |
|
20* & 25 Bridged
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Auxillary Air Regulator | Ignition On - Function of Aux. Air Regulator | Power to auxillary air regulator |
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21 & 7
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Wiring from starter/Starter Enrichment | Crank Engine (must have voltage at terminal 50 on starter). | Cranking Voltage |
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23 & 7
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Fuel Injector - Cyl. #1 | Injector & Wiring | ~16.0 - 16.4 ohms |
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24 & 7
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Fuel Injector - Cyl. #2 | Injector & Wiring | ~16.0 - 16.4 ohms |
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25 & 7
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Ground Connection/Control Unit | Wiring | 0 ohms |
| *do not connect test light on this terminal if ECU is connected | |||
Figure 2.