# INJECTION PUMP ELECTRICAL TESTING

## Fuel Pump Connector Terminals

[![fuel_pump_connector.png](https://wiki.mrkoronas.edim.tech/uploads/images/gallery/2025-06/scaled-1680-/fuel-pump-connector.png)](https://wiki.mrkoronas.edim.tech/uploads/images/gallery/2025-06/fuel-pump-connector.png)

## Fuel Pump Temperature Sensor

[![fuel_pump_temperature_sensor.png](https://wiki.mrkoronas.edim.tech/uploads/images/gallery/2025-06/scaled-1680-/fuel-pump-temperature-sensor.png)](https://wiki.mrkoronas.edim.tech/uploads/images/gallery/2025-06/fuel-pump-temperature-sensor.png)

### Fuel Pump Connector—Fuel Pump Side

<figure class="table" id="bkmrk-connector-terminal-c"><table style="width: 103.929%;"><tbody><tr><td style="width: 20.5438%;">Connector</td><td style="width: 9.51662%;">Terminal</td><td style="width: 22.3565%;">Checking</td><td style="width: 4.53172%;">Unit</td><td style="width: 8.1571%;">Set Value</td><td style="width: 4.38067%;">Min</td><td style="width: 4.83384%;">Max</td><td class="align-left" style="width: 25.6798%;">Notes</td></tr><tr><td style="height: 150px; width: 20.5438%;">8—pin Fuel injection pump</td><td style="height: 150px; width: 9.51662%;">1 — 2</td><td style="height: 150px; width: 22.3565%;">Fuel regulator position sensor</td><td style="height: 150px; width: 4.53172%;">Ω</td><td style="height: 150px; width: 8.1571%;"> </td><td style="height: 150px; width: 4.38067%;">5</td><td style="height: 150px; width: 4.83384%;">7</td><td class="align-left" style="height: 150px; width: 25.6798%;">Ignition off. — Disconnect 8-pin fuel injection pump connector. Connect an ohmmeter between fuel injection pump connector terminals 1 and 2 (fuel pump (FP) side) and then between terminals 2 and 3 (fuel injection pump side). The ohmmeter should read between 5 Ohms and 7 Ohms in both cases.</td></tr><tr><td style="height: 150px; width: 20.5438%;">8—pin Fuel injection pump</td><td style="height: 150px; width: 9.51662%;">2 — 3</td><td style="height: 150px; width: 22.3565%;">Fuel regulator position sensor</td><td style="height: 150px; width: 4.53172%;">Ω</td><td style="height: 150px; width: 8.1571%;"> </td><td style="height: 150px; width: 4.38067%;">5</td><td style="height: 150px; width: 4.83384%;">7</td><td class="align-left" style="height: 150px; width: 25.6798%;">Ignition off. — Disconnect 8-pin fuel injection pump connector. Connect an ohmmeter between fuel injection pump connector terminals 1 and 2 (fuel pump (FP) side) and then between terminals 2 and 3 (fuel injection pump side). The ohmmeter should read between 5 Ohms and 7 Ohms in both cases.</td></tr><tr><td style="height: 150px; width: 20.5438%;">8—pin Fuel injection pump</td><td style="height: 150px; width: 9.51662%;">5 — 6</td><td style="height: 150px; width: 22.3565%;">Fuel regulator</td><td style="height: 150px; width: 4.53172%;">Ω</td><td style="height: 150px; width: 8.1571%;"> </td><td style="height: 150px; width: 4.38067%;">0.5</td><td style="height: 150px; width: 4.83384%;">2.5</td><td class="align-left" style="height: 150px; width: 25.6798%;">Ignition off. — Disconnect 8-pin fuel injection pump connector. Connect an ohmmeter between fuel injection pump connector terminals 5 and 6 (fuel pump (FP) side). The ohmmeter should read between 0.5 Ohms and 2.5 Ohms in both cases.</td></tr><tr><td style="height: 150px; width: 20.5438%;">8—pin Fuel injection pump</td><td style="height: 150px; width: 9.51662%;">7—4</td><td style="height: 150px; width: 22.3565%;">Fuel temperature sensor</td><td style="height: 150px; width: 4.53172%;">kΩ</td><td style="height: 150px; width: 8.1571%;"> </td><td style="height: 150px; width: 4.38067%;">2.5</td><td style="height: 150px; width: 4.83384%;">2.75</td><td class="align-left" style="height: 150px; width: 25.6798%;">Ignition off.— Disconnect 8-pin fuel injection pump connector. Connect an ohmmeter between terminals 7 and 4 on the 8-pin fuel injection pump connector (sensor side). The ohmmeter should read 2.5—2.72 kΩ at +20°C, see diagram.</td></tr><tr><td style="height: 150px; width: 20.5438%;">8—pin Fuel injection pump</td><td style="height: 150px; width: 9.51662%;">1—Ground</td><td style="height: 150px; width: 22.3565%;">Fuel shut off solenoid</td><td style="height: 150px; width: 4.53172%;">Ω</td><td style="height: 150px; width: 8.1571%;"> </td><td style="height: 150px; width: 4.38067%;">6.9</td><td style="height: 150px; width: 4.83384%;">7.9</td><td class="align-left" style="height: 150px; width: 25.6798%;">Resistance in winding between terminals 1—ground: 6.9—7.9 Ω</td></tr></tbody></table>

</figure>## Fuel Pump Connector—ECU Side

<figure class="table" id="bkmrk-connector-terminal-c-1"><table><thead><tr><td>Connector</td><td>Terminal</td><td>Checking</td><td>Unit</td><td>Set Value</td><td>Min</td><td>Max</td><td>Ignition</td><td>Main Relay</td><td>Notes</td></tr></thead><tbody><tr><td>3—pin Fuel injection pump</td><td>1—Ground</td><td>Signal Cable</td><td>V</td><td>&lt; 2</td><td>2</td><td> </td><td>ON</td><td>ON</td><td>With ignition on, main relay on and the 3—pin fuel injection pump connector disconnected, the voltage between the 3-pin fuel injection pump connector terminal 1 (engine control module (ECM) side) and ground should be less than. 2 V.</td></tr><tr><td>3—pin Fuel injection pump</td><td>2—Ground</td><td>Signal Cable</td><td>Ohms</td><td>&gt;20</td><td>20</td><td> </td><td>OFF</td><td>OFF</td><td>With ignition off, main relay off (this may take up to 6 minutes) and 3-pin fuel injection pump connector disconnected, the resistance between the 3—pin fuel injection pump connector terminal 2 and ground should be greater than 20 Ohms, otherwise there is a short-circuit to ground in the cable.</td></tr><tr><td>3—pin Fuel injection pump</td><td>3—Ground</td><td>Power Cable</td><td>V</td><td>Batt Voltage</td><td>Batt Voltage</td><td>Batt Voltage</td><td>ON</td><td>ON</td><td>Ignition on— Wait until the main relay is activated. Connect a voltmeter between 3-pin fuel injection pump connector terminal 3 and ground. The voltmeter should read battery voltage.</td></tr><tr><td>3—pin Fuel injection pump</td><td>3—3 Main Relay</td><td>Power Cable</td><td>Ohms</td><td>0</td><td>0</td><td>0</td><td>N/A</td><td>N/A</td><td>Check circuit between 3-pin fuel injection pump connector terminal 3 and main relay terminal 3 for an intermittent open-circuit</td></tr><tr><td>8—pin Fuel injection pump</td><td>1—Ground</td><td>Power Cable</td><td>V</td><td>&gt;1.5—&lt;3.5</td><td>1.5</td><td>3.5</td><td>ON</td><td>ON</td><td>With the ignition on, the main relay activated and the 8—pin fuel injection pump connector disconnected, the voltage between the 8—pin fuel injection pump connector terminal 1 (engine control module (ECM) side) and ground should be between 1.5 and 3.5 V.</td></tr><tr><td>8—pin Fuel injection pump</td><td>2—Ground</td><td>Signal Cable</td><td>V</td><td>&gt;4—&lt;6</td><td>4</td><td>6</td><td>ON</td><td>ON</td><td>With the ignition on, the main relay activated and the 8—pin fuel injection pump connector disconnected, the voltage between the 8-pin fuel injection pump connector terminal 2 (engine control module (ECM) side) and ground should be between 4.0 and 6.0 V.</td></tr><tr><td>8—pin Fuel injection pump</td><td>3—Ground</td><td>Power Cable</td><td>V</td><td>&gt;0.5—&lt;4.5</td><td>0.5</td><td>4.5</td><td>ON</td><td>ON</td><td>With the ignition on, the main relay activated and the 8—pin fuel injection pump connector disconnected, the voltage between the 8—pin fuel injection pump connector terminal 3 (engine control module (ECM) side) and ground should be between 0.5 and 4.5 V.</td></tr><tr><td>8—pin Fuel injection pump</td><td>4—Ground</td><td>Ground Lead</td><td>Ohms</td><td>0</td><td>0</td><td>0</td><td>OFF</td><td>OFF</td><td>With the ignition off, main relay off and the fuel temperature sensor connector disconnected, the resistance between the fuel temperature sensor connector terminal 4 (engine control module (ECM) side) and ground should be approx. 0 Ohms.</td></tr><tr><td>8—pin Fuel injection pump</td><td>5—Ground</td><td>Power Cable</td><td>V</td><td>Batt Voltage</td><td>Batt Voltage</td><td>Batt Voltage</td><td>ON</td><td>ON</td><td>Ignition on and main relay on. Disconnect 8—-pin fuel injection pump connector. Connect a voltmeter between fuel injection pump connector terminal 5 and ground. The voltmeter should read battery voltage.</td></tr><tr><td>8—pin Fuel injection pump</td><td>6—Ground</td><td>Signal Cable</td><td>V</td><td>&gt;1</td><td>&gt;1</td><td> </td><td>ON</td><td>ON</td><td>With the ignition on and the 8-pin fuel injection pump connector disconnected the voltage between the 8—pin fuel injection pump connector terminal 6 (engine control module (ECM) side) and ground should be greater than 1 V. Otherwise there is an open-circuit or short-circuit to ground in the cable.</td></tr><tr><td>8—pin Fuel injection pump</td><td>7—Ground</td><td>Signal Cable</td><td>V</td><td>5</td><td> </td><td> </td><td>ON</td><td>ON</td><td>With the ignition on and the 8-pin fuel injection pump connector disconnected, the voltage between the 8—pin fuel injection pump connector terminal 7 (engine control module (ECM) side) and ground should be approx. 5 V.</td></tr></tbody></table>

</figure>## ECU Terminals

<figure class="table" id="bkmrk-terminal-signal-type"><table><tbody><tr><td>Terminal</td><td>Signal Type</td><td>Ignition on</td><td>Engine idling</td><td>Miscellaneous</td><td>Scrolling value VST</td></tr><tr><td>\#A1</td><td>Power supply, fuel regulator position sensor  
(Sensor in injection pump)</td><td>U=2.5 V  
UAC=0.4—0.5 V</td><td>U=2.5 V  
UAC=0.6 V</td><td>U increases with quantity of fuel injected</td><td> </td></tr><tr><td>\#A2</td><td>Signal ground, boost pressure sensor</td><td>Ulow</td><td>Ulow</td><td> </td><td> </td></tr><tr><td>\#A3</td><td>Signal, intake air temperature (IAT) sensor  
(Sensor in mass air flow(MAF) sensor)  
(Measuered relative to #A18)</td><td>+10C: U=4.1V  
+30C: U=3.3V  
+50C: U=2.5V  
+80C: U=2.5V  
+100C: U=1.0V</td><td> </td><td>U decreases with increasing intake air temperature (IAT)</td><td> </td></tr><tr><td>\#A4</td><td>Signal , needle lift sensor  
(Measured relative to #A18)</td><td>U=0.2V</td><td colspan="2">U increases with air mass</td><td> </td></tr><tr><td>\#A5</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A6</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A7</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A8</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A9</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A10</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A11</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A12</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A13</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A14</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A15</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A16</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A17</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A18</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A19</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A20</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A21</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A22</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A23</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A24</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A25</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A26</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A27</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A28</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A29</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A30</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A31</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A32</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A33</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A34</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A35</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A36</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A37</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A38</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A39</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A40</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A41</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A42</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#A43</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B1</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B2</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B3</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B4</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B5</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B6</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B7</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B8</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B9</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B10</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B11</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B12</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B13</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B14</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B15</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B16</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B17</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B18</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B19</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B20</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B21</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B22</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B23</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B24</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B25</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B26</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B27</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B28</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B29</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B30</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B31</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B32</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B33</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B34</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B35</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B36</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B37</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B38</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B39</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B40</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B41</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B42</td><td> </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td>\#B43</td><td> </td><td> </td><td> </td><td> </td><td>  
</td></tr></tbody></table>

</figure>