INJECTION PUMP ELECTRICAL TESTING
Fuel Pump Connector Terminals
Fuel Pump Temperature Sensor
Fuel Pump Connector—Fuel Pump Side
| Connector | Terminal | Checking | Unit | Set Value | Min | Max | Notes |
| 8—pin Fuel injection pump | 1 — 2 | Fuel regulator position sensor | Ω | 5 | 7 | 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. | |
| 8—pin Fuel injection pump | 2 — 3 | Fuel regulator position sensor | Ω | 5 | 7 | 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. | |
| 8—pin Fuel injection pump | 5 — 6 | Fuel regulator | Ω | 0.5 | 2.5 | 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. | |
| 8—pin Fuel injection pump | 7—4 | Fuel temperature sensor | kΩ | 2.5 | 2.75 | 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. | |
| 8—pin Fuel injection pump | 1—Ground | Fuel shut off solenoid | Ω | 6.9 | 7.9 | Resistance in winding between terminals 1—ground: 6.9—7.9 Ω |
Fuel Pump Connector—ECU Side
| Connector | Terminal | Checking | Unit | Set Value | Min | Max | Ignition | Main Relay | Notes |
| 3—pin Fuel injection pump | 1—Ground | Signal Cable | V | <
2 |
2 | ON | ON | 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. | |
| 3—pin Fuel injection pump | 2—Ground | Signal Cable | Ohms | >20 | 20 | OFF | OFF | 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. | |
| 3—pin Fuel injection pump | 3—Ground | Power Cable | V | Batt Voltage | Batt Voltage | Batt Voltage | ON | ON | 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. |
| 3—pin Fuel injection pump | 3—3 Main Relay | Power Cable | Ohms | 0 | 0 | 0 | N/A | N/A | Check circuit between 3-pin fuel injection pump connector terminal 3 and main relay terminal 3 for an intermittent open-circuit |
| 8—pin Fuel injection pump | 1—Ground | Power Cable | V | >1.5—<3.5 | 1.5 | 3.5 | ON | ON | 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. |
| 8—pin Fuel injection pump | 2—Ground | Signal Cable | V | >4—<6 | 4 | 6 | ON | ON | 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. |
| 8—pin Fuel injection pump | 3—Ground | Power Cable | V | >0.5—<4.5 | 0.5 | 4.5 | ON | ON | 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. |
| 8—pin Fuel injection pump | 4—Ground | Ground Lead | Ohms | 0 | 0 | 0 | OFF | OFF | 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. |
| 8—pin Fuel injection pump | 5—Ground | Power Cable | V | Batt Voltage | Batt Voltage | Batt Voltage | ON | ON | 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. |
| 8—pin Fuel injection pump | 6—Ground | Signal Cable | V | >1 | >1 | ON | ON | 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. | |
| 8—pin Fuel injection pump | 7—Ground | Signal Cable | V | 5 | ON | ON | 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. |
ECU Terminals
(Sensor in injection pump) U=2.5 V
UAC=0.4—0.5 V U=2.5 V
UAC=0.6 V U increases with quantity of fuel injected #A2 Signal ground, boost pressure sensor Ulow Ulow #A3 Signal, intake air temperature (IAT) sensor
(Sensor in mass air flow(MAF) sensor)
(Measuered relative to #A18) +10C: U=4.1V
+30C: U=3.3V
+50C: U=2.5V
+80C: U=2.5V
+100C: U=1.0V U decreases with increasing intake air temperature (IAT) #A4 Signal , needle lift sensor
(Measured relative to #A18) U=0.2V U increases with air mass #A5 #A6 #A7 #A8 #A9 #A10 #A11 #A12 #A13 #A14 #A15 #A16 #A17 #A18 #A19 #A20 #A21 #A22 #A23 #A24 #A25 #A26 #A27 #A28 #A29 #A30 #A31 #A32 #A33 #A34 #A35 #A36 #A37 #A38 #A39 #A40 #A41 #A42 #A43 #B1 #B2 #B3 #B4 #B5 #B6 #B7 #B8 #B9 #B10 #B11 #B12 #B13 #B14 #B15 #B16 #B17 #B18 #B19 #B20 #B21 #B22 #B23 #B24 #B25 #B26 #B27 #B28 #B29 #B30 #B31 #B32 #B33 #B34 #B35 #B36 #B37 #B38 #B39 #B40 #B41 #B42 #B43