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Test TC-21C - Injector No. 1 Control Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see appropriate WIRING DIAGRAMS - NON-TURBO article.
  1. It may be necessary to remove intake plenum for access to injector connectors. Reconnect injector harness 10-pin connector. Disconnect injector No. 1 connector. Turn ignition on. Using scan tool, actuate ASD relay.
  2. Using scan tool in voltmeter mode, check voltage on injector No. 1 connector ASD relay output circuit Black/Red wire. If voltage cycles high and low, go to next step. If voltage does not cycle high and low, repair open ASD relay output circuit. Perform TEST VER-2A.
  3. Turn ignition off. Using an external ohmmeter, check resistance of injector No. 1 driver circuit, Light Green/Black wire, between injector No. 1 connector and PCM connector terminal No. 13. If resistance is less than 5 ohms, replace injector No. 1. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open injector No. 1 driver circuit. Perform TEST VER-2A.