Injector Check - Mazda 626 MX-6 Workshop Manual

4A
FUEL SYSTEM
Test connector Green 1 pin
4A-52
INJECTOR
On-vehicle Inspection
Engine does not start
Perform "Quick Inspection for Electrical Signal"
below.
Engine runs
1. Warm up the engine and run it at idle.
2. Listen for operational sound of the injector with a
screwdriver or a sound scope.
86U04A-084
3. Disconnect the connector from each injector
respectively.
4. Check that the engine speed decreases about
100—200 rpm each time.
5. If not correct, check the following:
No operating sound and no speed drop
Perform " Quick Inspection for Electrical
Signal' ' below.
No speed drop only
Injector resistance
Injection volume of injector
Quick Inspection for Electrical Signal
1. Ground the test connector (Green, 1-pin) with a
jumper wire.
86U04A-086
2. Turn the ignition switch ON.
3. Open the throttle valve and check for a " click" at
the injector with a screwdriver or sound scope as
it is opened.
4. If nothing is heard, check the injector wiring circuit.
5. If nothing is heard at all injectors, check the main
relay (Refer to page 4A—87) and circuit.
86U04A-087