Mitsubishi Mirage 2015 - DTC C1912: Tire air pressure low, Tire1

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS
TSB Revision
WHEEL AND TIRE
31-28
DTC C1912: Tire air pressure low, Tire1
DTC C1922: Tire air pressure low, Tire2
DTC C1932: Tire air pressure low, Tire3
DTC C1942: Tire air pressure low, Tire4
CAUTION
If there is any problem in the CAN bus lines, an
incorrect DTC may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP
54C
 CAN Bus Diagnostics Table P.54C-12).
.
DTC SET CONDITION
When the tire pressure included in the signal from
the TPMS transmitter is less than the specified value,
ETACS-ECU <Vehicles without Keyless Operation
System> or KOS&OSS-ECU <Vehicles with Keyless
Operation System> sets this code.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to be set is:
 Drop of tire pressure
 Flat tire
 TPMS transmitter malfunction
 Malfunction of ETACS-ECU <Vehicles without
Keyless Operation System>
 Malfunction of KOS&OSS-ECU <Vehicles with
Keyless Operation System>
 CAN-bus line malfunction
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C 
CAN Bus Diagnostics Table
P.54C-90). On
completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Recheck if DTC C1912, C1922, C1932 or C1942 is set.
(1) Turn the ignition switch (engine starting switch) from the
"LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch (engine starting switch) to the
"LOCK" (OFF) position.
Q: Is DTC C1912, C1922, C1932 or C1942 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Tire check
Check that there is no abnormality for the items below.
 Flat tire
 Cracked tire
 Air leak from valve
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace or repair it. Then go to Step 4.