![]() Check Key On Engine Off codes and if P1298 is retrieved, or if P1298 returns with no other symptoms or codes, replace the IDM with P/N XC3Z-12B599-AA. If all of the above is OK, or the P1298 still exists after all repairs are done, clear the code, then cycle the key off and on three times, leaving the key in the on position for five seconds each time. If P1298 is the only code retrieved, and the engine cranks good but doesn't start, test the glow plug system and check for voltage drop or PCM reset during cranking. If any codes other than P1298 are retrieved, diagnose and repair these first. Perform all scan tool code retrieval diagnostic tests. Verify battery voltage is greater than 10 volts. This may be due to circuit tolerance inside the Injector Driver Module setting the false code if battery voltage is low. The Check engine light may illuminate on these trucks with a false trouble code P1298 (IDM failure). I also have a known good one I could ship you for a loaner if you like.ĩ8/99 E-Van 99 F-Series built through 4-12-99, Check engine light/DTC P1298: Usually there is no MIL when I've seen this in the past. New ones are outrageously priced, and FICMs sometimes work correctly and are changed to get rid of a ghost P1298. A know good 7.3 IDM and a known good 6.0 FICM are two tools that are indispensable when working on PSD's.
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