Engine Controls - DTC P1440/P1679/MIL ON

02-058

October 22, 2011

Applies To:
2003 Civic Hybrid - From VIN JHMES9...3S000001 thru JHMES9...3S010364

MIL Comes On With DTC P1440, DTC P1679, or Other Problems With the Generic Scan Tool
(Supercedes 02-058, dated July 19, 2011, to revise the information marked by the black bars and asterisks).

REVISION SUMMARY

*Under WARRANTY CLAIM INFORMATION, a flat rate time was changed.*

SYMPTOMS

The troubleshooting in this bulletin targets complaints of IMA DTC P1440 (IMA System Problem) or P1679 (RSCD Signal Circuit Malfunction). The software update also resolves these problems:

^ Communication between the Motor Control Module (MCM) and the generic scan tool fails if the ignition switch is turned off within 5 seconds and turned back on within 30 seconds of the generic scan tool being turned on.

^ Previously erased DTCs stored in the IMA system (P1446 or P1449) reappear when using a generic scan tool.

^ The scan tool's IMA freeze data screen displays incomplete information if the MIL illuminates and then goes out. Even though freeze data remains stored after the MIL goes off, the freeze data screen does not display the stored DTC. The freeze data information gathered is not useful without the associated DTC.

^ IMA DTC P1435 is shown on the Honda Diagnostic System (HDS) or the PGM Tester, but it may not be shown on the generic scan tool.

^ Specific automatic transmission DTCs will needlessly cause the shut down of the motor assist and idle stop systems. During this mode, the MIL is not illuminated and the gear position indicator "D" flashes.

PROBABLE CAUSES

^ The Motor Control Module (MCM) incorrectly detects a problem with the IMA system.

^ The Motor Control Module (MCM) programming is not correct.

CORRECTIVE ACTION

Update the vehicle's ECM, the IMA battery system, and the IMA motor system's software.

WARRANTY CLAIM INFORMATION





The normal warranty applies.

DIAGNOSIS

Check the IMA system for DTC's. If IMA codes P1585 or P1590-P1595 as present, follow the service manual procedure to repair the affected sensor(s) before doing the software updates described in this bulletin.

REPAIR PROCEDURE

Update the PGM-FI software. Refer to Service Bulletin 01-023, Updating Control Units/Modules. Be sure to update the following three control modules:

^ ECM

^ IMA Battery System (within the MCM)

^ IMA Motor System (within the MCM)





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