MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-954
DTC U1102: ABS-ECU TIME-OUT
CAUTION
• If the PCM output the DTC U1102, make sure
to diagnose the CAN bus line.
• Before replacing the ECU, make sure that the
communication circuit is operating normally.
.
DTC SET CONDITIONS
Check Conditions
• Battery positive voltage is 10 volts or higher.
• Engine is not cranked, or at least 3 seconds have
passed since engine was cranked.
Judgement Criteria
• Unable to receive ABS-ECU signals through the
CAN bus line.
.
COMMENT
Current Trouble
• Some of the possible causes are a harness or
connector damage between the PCM and the
ABS-ECU on the CAN bus line, a failure in the
ABS-ECU power supply system, a failure in the
ABS-ECU, or a failure in the PCM.
Past Trouble
• Proceed to troubleshoot based on a harness or
connector damage on the CAN bus line between
the PCM and ABS-ECU, and a failure in the ABS
power supply system. Refer to "How to cope with
past trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How
to Cope with Intermittent Malfunctions
P.00-14
).
CAUTION
When the ignition key is maintained within the
range "A" (i.e., the ignition switch IG2 is in OFF
position but the cranking does not start) for more
than 1 second, PCM stores DTC U1102 (the past
trouble).
NOTE: If a malfunction occurred in the past, a failure
cannot be discovered through the MB991958 CAN
bus diagnosis even if there might be a problem with
the CAN bus. In this case, refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
P.00-14
.
Furthermore, it is possible to narrow down the areas
of the possible failures from the DTCs that are output
by the ECUs, which are communicating on the CAN
bus (Refer to GROUP 54C, CAN bus line Diagnos-
tics Flow
P.54C-6
).
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• CAN line harness damage or connector damage.
• ABS-ECU failed.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
AK204418 AB
ACC POSITION
LOCK (OFF)
POSITION
ON POSITION
START
POSITION
RANGE
"A"