Fuel Supply System — Fuel Injector: Troubleshooting Flowchart (cont'd)
6-74flowchartFuel Injector
Troubleshooting Flowchart (cont'd)
1
(From page 6-73)
2
Is there battery voltage ?
NO
Turn the ignition switch OFF.
Turn the ignition switch OFF.
Disconnect 6P connector on the injector resistor.
Turn the ignition switch ON.
Measure voltage between YEL/BLK (+) terminal and body ground.
Is there battery voltage ?
YES
3
Measure voltage between the following terminals. • No. 1 injector: RED/BLK (+) terminal and BRN (−) terminal. • No. 2 injector: RED/BLK (+) terminal and RED (−) terminal. • No. 3 injector: RED/BLK (+) terminal and LT BLU (−) terminal. • No. 4 injector: RED/BLK (+) terminal and YEL (−) terminal.
4
Is there battery voltage ?
YES
Disconnect C451 (17P) connector from the ECU.
Disconnect C451 (17P) connector from the ECU.
Is there battery voltage ?
NO
5
Reconnect the 2P connector to the injector.
6
Connect the PGM-FI test harness between the ECU and connector (page 6-19).
7
Measure voltage between A2 (−) terminal and following terminals, • No.1 injector: A1 (+) terminal. • No.2 injector: A3 (+) terminal. • No.3 injector: A5 (+) terminal. • No.4 injector: A7 (+) terminal.
8
Is there battery voltage ?
NO
Repair open in the wire between the ECU (A1, A3, A5 or A7) and the injector.
YES
9
Substitute a known-good ECU and recheck. If prescribed voltage is now available, replace the original ECU.