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DI-309
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BU-08
DTC C1253 / 53 Motor Relay Circuit
CIRCUIT DESCRIPTION
The ABS MTR relay and TRC MTR relay supply power to the hydraulic brake booster pump motor. While
the ABS & BA & TRAC & VSC are activated, the ECU switches the motor relay ON and operates the hydraulic
brake booster pump motor.
DTC No. DTC Detecting Condition Trouble Area
When any of the condition 1. through 4. is detected:
1. After the ignition switch is turned ON, open in the relay
coil is detected for more than 1 sec.
2. When the pressure switch does not control motor
driving, the status that the motor relay is always ON
continues for more than 1 sec. due to short circuit. S ABS MTR relay or TRC MTR relay
C1253 / 53 3. When the pressure switch (PH) detects the low S ABS MTR relay or TRC MTR relay circuit
pressure or while the pump motor operates to increase S Hydraulic brake booster pump motor circuit
the pressure, the status that the motor relay does not
turn ON continues for more than 0.2 sec.
4. When pressure switch does not control motor driving,
the status that the motor relay is always ON due to the
welded contact continues for more than 2 sec.
2002 4RUNNER (RM887U)
Author : Date : 485
DI-310
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
WIRING DIAGRAM
Skid Control ECU
1
VSC R/B R-B
V16 R1+
TRC MTR Relay 2
Y-B
5 V17 R2+
R2+ MR2 5
3 4 1
R P-B
BM2 V17 MR2
5 +BM2 5
1 2 Hydraulic Brake Booster
ABS MTR Relay 3
W
R V11
BM1 BM2
5 +BM1 5
1 2 2 7 27
L P-B
V10 V11 V16 MMT
5 R1+ MR1 5 BM1 MTT
3 4
F13 5 28
6 GR
Fuse Box V11 V16 MT+
W-B GHD2 MT+
R ABS2 W-R V11
1 2 1 18
8
O
Engine Room J/B V10 V11 V16 MT-
GND1 MT-
29
W L-B
2 2 V16 MR1
A A
W-B W-B
J2 J1
Battery EA EB
J/C
F14348
2002 4RUNNER (RM887U)
Author : Date : 486
DI-31 1
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 3 in case of not
using the hand-held tester.
1 Check ABS MTR relay and TRC MTR relay operation.
PREPARATION:
(a) Connect the hand-held tester to DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check the operation sound of the ABS MTR relay and TRC MTR relay individually when operating them with
the hand-held tester.
OK:
The operation sound of the ABS MTR relay and TRC MTR relay should be heard.
NG Go to step 3.
OK
2 Check for short circuit (to B+) in harness and connector between MT of hydrau-
lic brake booster and skid control ECU (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
2002 4RUNNER (RM887U)
Author : Date : 487
DI-312
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
3 Check voltage between terminal 1 of VSC R/B (for ABS MTR relay and TRC MTR
relay) and body ground.
VSC R/B TRC MTR Relay
PREPARATION:
Remove the ABS MTR relay and TRC MTR relay from VSC R/B.
CHECK:
1
Measure voltage between terminal 1 of VSC R/B (for ABS MTR
1 relay and TRC MTR relay) and body ground.
(-) (+) OK:
Voltage: 10 - 14 V
ABS MTR Relay
F09168
NG Check and repair harness or connector.
OK
4 Check ABS MTR relay and TRC MTR relay.
CHECK:
Check continuity between each pair of terminals of the motor
2 1 relay.
OK:
4 3
Continuity
Terminals 3 and 4
(Reference value 1)
Open
Terminals 1 and 2 Open
1
*1: ABS MTR relay 62
2 TRC MTR relay 54
4
Continuity
3
Continuity
1
CHECK:
2 (a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
Terminals 1 and 2 Continuity
(-) 4 3
(+)
F00044 NG Replace ABS MTR relay or TRC MTR relay.
OK
2002 4RUNNER (RM887U)
Author : Date : 488
DI-313
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
5 Check continuity between each terminal BM1 and BM2 and terminal MMT of skid
control ECU.
ABS TRC CHECK:
2
MTR MTR (a) Check continuity between terminal BM1 of the ABS MTR
Relay 2 Relay relay and terminal MMT of the skid control ECU.
VSC R/B (b) Check continuity between terminal BM2 of the TRC MTR
Motor Relay
relay and terminal MMT of the skid control ECU.
3 2 OK:
2
3 Continuity
HINT:
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