Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 488
TPM(diag)-29
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
Q: DTC 51 TRANSMITTER 1 BATTERY VOLTAGE DECREASE
NOTE:
Refer to DTC 54 for diagnostic procedure. <Ref. to TPM(diag)-30, DTC 54 TRANSMITTER 4 BATTERY
VOLTAGE DECREASE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
R: DTC 52 TRANSMITTER 2 BATTERY VOLTAGE DECREASE
NOTE:
Refer to DTC 54 for diagnostic procedure. <Ref. to TPM(diag)-30, DTC 54 TRANSMITTER 4 BATTERY
VOLTAGE DECREASE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
S: DTC 53 TRANSMITTER 3 BATTERY VOLTAGE DECREASE
NOTE:
Refer to DTC 54 for diagnostic procedure. <Ref. to TPM(diag)-30, DTC 54 TRANSMITTER 4 BATTERY
VOLTAGE DECREASE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
TPM(diag)-30
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
T: DTC 54 TRANSMITTER 4 BATTERY VOLTAGE DECREASE
DTC DETECTING CONDITION:
Low battery signals received 20 times from each transmitter.
TROUBLE SYMPTOM:
Tire pressure warning light blinks 25 times and then illuminates.
Step
Check
Yes
No
1
CHECK TRANSMITTER.
1) Replace all transmitters and register their
IDs. <Ref. to TPM(diag)-9, REGISTER TRANS-
MITTER ID, OPERATION, Subaru Select Moni-
tor.>
2) Perform the Clear Memory Mode, and per-
form driving test.
Is the fault eliminated?
Internal battery of
the transmitter had
worn out.
TPM(diag)-31
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
U: DTC 61 VEHICLE SPEED IS ABNORMAL
DTC DETECTING CONDITION:
Vehicle speed function codes were received from the transmitter, but the vehicle speed signal was not input
to the module.
TROUBLE SYMPTOM:
Tire pressure warning light blinks 25 times and then illuminates.
WIRING DIAGRAM:
Tire Pressure Monitoring System <Ref. to WI-71, WIRING DIAGRAM, Tire Pressure Monitoring System.>
Step
Check
Yes
No
1
CHECK TPMS & KEYLESS ENTRY CON-
TROL MODULE.
1) Connect an oscilloscope to the terminal No.
3 of the TPMS & keyless entry control module
connector (R221).
Connector & terminal
(R221) No. 3 (+) — Chassis ground (–):
2) Lift up the vehicle and then drive the vehicle
at 40 km/h (25 MPH) and check the vehicle
speed signal at that time.
Is the vehicle speed being
input?
2
CHECK HARNESS.
1) Disconnect the combination meter connec-
tor (i10).
2) Connect the tester to the TPMS & keyless
entry control module connector (R221) and
combination meter connector (i10), and mea-
sure the resistance.
Connector & terminal
(R221) No. 3 — (i10) No. 31:
Is the resistance less than 0.5
Ω?
Replace the com-
bination meter.
<Ref. to IDI-16,
REMOVAL, Com-
bination Meter.>
Repair or replace
the open circuit of
the harness.
I/F
I/F
B99
1 2
3 4 5
6 7 8 9 10 11 12
R221
1 2 3 4 5 6
7 8 9 10 11 12
B310
4 5 6 7 8 9
26 27 28 29 30
2 3
1
31 32 33 34 35 36
10 11
14 15 16 17 18 19
37 38 39 40
12 13
41 42 43 44 45 46
20 21
23 24
22
25
i10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
i1
5 6 7 8
2
1
9
4
3
10
24
22
23
25
27
26
28
11 12 13
14 15 16
17 18 19 20 21
2
R221
TPM00080
33
12
VDC CM
B310
5
3
B99
R3
i1
B36
31
2
i10
COMBINATION METER
FB-36
F/B FUSE NO. 5
(IG)
POWER
SUPPLY
CIRCUIT
MICRO COMPUTER
SPEEDO-
METER
TO POWER SUPPLY
CIRCUIT
TPMS &
KEYLESS ENTRY CM
TPM(diag)-32
General Diagnostic Table
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
12.General Diagnostic Table
A: INSPECTION
Symptoms
Faulty parts
Tire pressure warning light illumi-
nates.
Tire pressure is reduced.
• Improper tire pressure adjustment.
• Punctured tire
Tire pressure warning light blinks
25 times and then illuminates.
Tire pressure monitoring system
has malfunction.
• Air pressure sensor malfunction
• Air pressure sensor is out of battery.
• Defective TPMS & keyless entry control module
• Defective vehicle harness
• Defective combination meter
Tire pressure is dropping but the
warning light does not illuminate.
Tire pressure warning light does
not illuminate.
• Air pressure sensor malfunction
• Defective TPMS & keyless entry control module
• Defective combination meter
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