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

Terminal	Signal Type	Ignition on	Engine idling	Miscellaneous	Scrolling value VST
#A1	Power supply, fuel regulator position sensor (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