Advertisement
1. Using a clip-on ammeter of motor tester, check actuation of injector. Clip-on ammeter must satisty the
following conditions.
Measuring range >25A
Bandwidth > 100kHz
2. Attach the plug to the injector. Fasten clip-on ammeter around lead to pin.2 of corresponding injector.
Allow engine to be at idle.
Refer to the set value(current) as following figure.
a. Length of holding current phase (max.12A) is governed by engine speed, injection time and
changes on velocity.
b. The first current curve shows the pre-injection.
3. Check the injector for injecting of fuel. As checking procedure, detach the injector plug from each
boxes and connect to replaced injector.
If change to enine running results, injector is injecting. If no change to engine running results, injector
is not injecting.
This test cannot however establish whether an injector is injecting an correct quantity.
If necessary, all injectors have to be replaced.
AFTER RUN TEST
1. Measure the supply voltage at ECU pin 114(Clinder #1 Injector), pin 119 (Clinder #4 Injector) to pin
117 and pin 120(Cylinder #3 Injector), pin 121(Cylinder #2 Injector) to pin 118 with ignition OFF.
Set value : 0V
2. Check wiring if set value is not attained. If wiring is OK, replace the ECU.
MEASURE THE RESISTANCE BETWEEN TERMINALS
1. Detach the connector from injector.
2. Measure the resistance between terminals.
Specified value :
0.3 ~ 0.6Ω (at 20°C)
Advertisement
