Code 16: Fuel Injector Circuit

NOTE: If engine will not start, crank engine for 10 seconds or more, if necessary, to set code.

Turn ignition off. Remove BACK-UP fuse (7.5-amp) from underhood fuse/relay box for 10 seconds to reset ECM. Check ECM for fault codes. If Code 16 is not present, problem is intermittent. Check for poor connections at ECM, fuel injector and wiring harness connectors. Test drive vehicle and retest.
If Code 16 is present, start engine. Using a stethoscope, check for clicking sound at each injector. If injector does not click, turn ignition off. Disconnect 2-pin injector connector from affected injector. Measure resistance between injector terminals. Resistance should be 10-13 ohms. If resistance is not 10-13 ohms, replace injector. If resistance is okay, go to step 3).
Turn ignition on. Measure voltage between fuel injector harness Yellow/Black wire and body ground. If battery voltage is not present, repair open in Yellow/Black wire between fuel injector and main relay. If battery voltage is present, turn ignition off. Reconnect fuel injector connector.
Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM harness connectors. See Figure. Turn ignition on. Check voltage between A23 (-) and following test terminals.
- Injector No. 1: A1 (+)
- Injector No. 2: A3 (+)
- Injector No. 3: A5 (+)
- Injector No. 4: A2 (+)
If battery voltage is not present, repair open in wire between injector and affected ECM connector terminal (A1, A2, A3 or A5). If battery voltage is present, replace ECM and retest.