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DI-253
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BJ-03
DTC C0278 / 11, C0279 / 12 ABS SOL Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No. DTC Detecting Condition Trouble Area
Conditions 1. and 2. continue for 0.2 sec. or more:
1. ECU terminal IG1 voltage is 9.5 V to 17.0 V and the
ABS SOL relay is ON, however, the contact point of the
C0278 / 11 ABS SOL relay is OFF.
2. With ABS SOL relay ON, ECU terminal IG1 voltage be-
comes 9.5 V or less and the contact point of the ABS S ABS SOL relay
SOL relay does not become ON. S ABS SOL relay circuit
Immediately after ECU terminal IG1 becomes ON, ABS
SOL relay is OFF. However, the condition that the ABS
C0279 / 12
SOL relay remains ON due to the contact point continues
for 0.2 sec. or more.
2002 4RUNNER (RM887U)
Author : Date : 429
DI-254
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
WIRING DIAGRAM
Skid Control ECU
1
R-B
V16 R1+
VSC R/B
ABS SOL Relay
19
G-B
5 R+ SR 5 V16 SR
4 6
5 5
R-B
5 +BS BS 5 S5 S5
1 3
Short R-B
B Engine Room R/B Connector
ABS1
2 2 Hydraulic
2 1 Brake Booster
4
BS
W V10 V12
ECU
V12
Battery 1 10
AST LG-B
V11 V17 AST
F14340
2002 4RUNNER (RM887U)
Author : Date : 430
DI-255
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 2 in case of not
using the hand-held tester.
1 Check ABS SOL 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 SOL relay when operating it with the hand-held tester.
OK:
The operation sound of the ABS SOL relay should be heard.
OK Go to step 6.
NG
2 Check voltage between terminal 1 of VSC R/B (for ABS SOL relay) and body
ground.
VSC R/B PREPARATION:
Remove the ABS SOL relay from VSC R/B.
CHECK:
Measure the voltage between terminals 1 and 2 of VSC R/B (for
ABS SOL relay).
OK:
Voltage: 10 - 14 V
1
F13775
NG Check and repair harness or connector.
OK
2002 4RUNNER (RM887U)
Author : Date : 431
DI-256
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
3 Check ABS SOL relay.
CHECK:
3 2 1 Check continuity between each terminal of ABS SOL relay.
OK:
Continuity
Terminals 4 and 6
(Reference value 80 )
6 5 4
Terminals 2 and 3 Continuity
Terminals 1 and 3 Open
Open 2 1
3
Continuity
6 5 4
Continuity
CHECK:
Continuity 3 2 1 (a) Apply battery positive voltage between terminals 4 and 6.
(b) Check continuity between each terminal of ABS SOL
relay.
Open OK:
Terminals 2 and 3 Open
(-) 6 5 4 Terminals 1 and 3 Continuity
(+)
F00042
NG Replace ABS SOL relay.
OK
2002 4RUNNER (RM887U)
Author : Date : 432
DI-257
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
4 Check continuity between terminal 3 of VSC R/B (for ABS SOL relay) and termi-
nal AST of skid contorl ECU.
CHECK:
Check continuity between terminal 3 of VSC R/B (for ABS SOL
ABS Solenoid 3 relay) and terminal AST of the skid control ECU.
Relay
OK:
Continuity
HINT:
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