General Troubleshooting Information - Honda Accord 2008 Manual

07/11/02 09:28:48 61TA0000_180_0058
TPMS
General Troubleshooting Information (cont'd)
Problems That Are Not System Faults
• Tire Sealant
Fluid sealant used to repair a punctured tire can
damage the tire pressure sensor mounted on each
wheel. It can prevent the system from detecting the
correct tire pressure, which sets a DTC 11, 13, 15 or
17 even though the system is normal.
• Cold Weather
When the weather is extremely cold - about
( 40 °C) or colder - the output of the lithium battery −
in each tire pressure sensor may drop far enough that
the control unit sets a DTC for low battery voltage (31,
33, 35, or 37) even though the system is normal.
• Non-TPMS Wheels
Vehicles equipped with TPMS must use wheels made
for the system. Every TPMS wheel has an exclusive
mark; do not use any other type of wheel.
How a Diagnostic Trouble Code (DTC) is Set
• When the system detects a problem, the TPMS
control unit sets a code, but shifts to fail-safe mode,
and will not alert the driver to low tire pressures.
• If the TPMS control unit loses power, or fails, the
TPMS indicator will come on, but no DTC are set.
• The memory can hold all the DTCs that could
possibly be set. However, when the same DTC is
detected more than once, the most recent one
overwrites the previous one, so only the latest DTC of
each type is stored.
• DTCs are indicated in ascending order, not in the
order they occurred.
• Set DTCs are stored in the EEPROM (nonvolatile
memory), they cannot be cleared by disconnecting
the battery. To clear a DTC, connect the HDS (Honda
Diagnostic System) to the data link connector (DLC),
and follow the screen prompts.
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How to Troubleshoot DTCs
DTC troubleshooting procedures assume the cause of
the problem is still present and the TPMS indicator is
still on. (NOTE: The TPMS indicator comes on for DTCs
11, 13, 15, and 17 only if the low tire pressure indication
is false, caused by a problem in the system.) Do not use
a troubleshooting procedure unless the system has set
the DTC listed for it.
−
40 °F
1. Ask the customer to describe the conditions when
the indicator came on, and try to reproduce the
same conditions for troubleshooting. Find out if the
customer checked and/or adjusted tire pressures
since the indicator came on.
2. If an indicator does not come on during the test-
drive, check for loose terminals, poor contact due
to damaged terminals, etc. before you start
troubleshooting.
3. After troubleshooting, repair and clear the DTCs,
and test-drive the vehicle. Make sure no indicators
come on.
4. Check for DTCs from other control units that are
connected via F-CAN. If there are DTCs that are
related to F-CAN, the most likely cause was that the
ignition switch was turned to ON (II) with the TPMS
control unit connector disconnected. Clear the
DTCs. Check for PGM-FI and TPMS codes, and
troubleshoot those first.