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Home >> Mazda >> 1996 >> Millenia V6-2496cc 2.5L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Fuel Injection Control Inspection >> System Inspection

System Inspection

SYSTEM INSPECTION




1. Connect the special service tool (SST) New Generation Star Tester (NGS) to the data ink connector 2.
2. Warm up the engine to normal operating temperature and let it idle.




3. Select the PID/DATA MONITOR AND RECORD function of the NGS.
4. With no electrical load operating select "INJ RH" and "INJ LH" on the NGS display. NGS measures and shows the fuel injector pulse widths.
5. Increase the engine speed and verify that the pulse width changes.
6. If signal cannot be detected, or shows no change, check voltage at following terminals.
- PCM terminal 3E (Mass air flow sensor)
- PCM terminal 4AH 4AL (Crankshaft position sensor).

Fuel Cut Control
1. Connect the (SST-NGS) to the data link connector 2.
2. Warm up the engine to normal operating temperature and let it idle.
3. Turn off the A/C switch.
4. Select the PID/DATA MONITOR AND RECORD function of the NGS.
5. Select "INJ RH" and "INJ LH" on the NGS display. NGS measures and shows the fuel injector pulse width.
6. Open the throttle valve and increase the engine speed to 4,000 rpm.
7. Close the throttle valve quickly Verify that the fuel injector pulse width becomes O ms until the engine speed drops to approx. 1,200 rpm, then recovers after that.
8. If not as specified, check voltage at following terminal
- PCM terminal 3Q (Engine coolant temperature sensor)
- PCM terminal 3X (Closed throttle position switch)
- PCM terminal 4AH, 4AL (Crankshaft position sensor)

Dechoke Control
1. Connect the (SST-NGS) to the data link connector 2.
2. Select the PID/DATA MONITOR AND RECORD function of the NGS.
3. Select "INJ RH" and "INJ LH" on the NGS display. NGS measures and shows the fuel injector pulse width.
4. Turn the ignition switch to START and verify that the engine start.
5. Depress the accelerator pedal to wide open throttle and turn the ignition switch to START. Verify that the fuel injector pulse width becomes 0 ms and engine does not start while cranking.
6. If not as specified, check the PCM terminal 3B voltage. (Throttle position sensor)
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