DTC 21: Ignition Signal
- Start engine. If engine does not start, go to next step. If engine starts, go to step 3) or to step 4).
- Check Ground Circuit - If engine does not start, turn ignition off. Disconnect Power Transistor Unit (PTU) harness connector. Verify harness continuity between PTU harness connector terminal "d" (Black wire) and engine ground. See Fig 1 -Fig 5 . If continuity is present, go to step 4). If continuity is not present, repair harness or connectors as necessary and perform FINAL CHECK .
- Search For Malfunctioning Circuit Using CONSULT - Turn ignition off and connect CONSULT. Perform POWER BALANCE in ACTIVE TEST mode with CONSULT. Search for circuit which does not produce a momentary engine speed drop.
- Check Output Signal Circuit
- Turn ignition off. Disconnect ECM harness connector and PTU harness connector. Verify harness continuity between ECM harness connector terminals and PTU harness connector terminals as follows:
- ECM terminal No. 1 and PTU terminal "g" (Yellow wire).
- ECM terminal No. 2 and PTU terminal "f" (Light Green/Black wire).
- ECM terminal No. 3 and PTU terminal "e" (White wire).
- ECM terminal No. 11 and PTU terminal "c" (Pink/Black wire).
- ECM terminal No. 12 and PTU terminal "b" (Red/Blue wire).
- ECM terminal No. 13 and PTU terminal "a" (Gray wire).
See Fig 6 . If continuity is present, go to next step. If continuity is not present, verify harness continuity between ECM connector and PTU connector. Repair harness or connectors as necessary.
- Check Component - Inspect power transistor unit. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. Replace power transistor unit if necessary and perform FINAL CHECK .