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DI-343
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI8XV-02
DTC Always ON Malfunction in ECU
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
S Battery
Either the condition 1. or 2. is detected:
S Charging system
Always ON 1. The ECU connectors are disconnected from the ECU.
S Power source circuit
2. There is a malfunction in the ECU internal circuit.
S Skid control ECU
HINT:
There is a case that the hand-held tester cannot be used when ECU is abnormal.
WIRING DIAGRAM
Driver Side J/B Skid Control ECU
Combination Meter
2 GAUGE 8 12 ABS 18 1
B-Y B-L
1I 1F C29 C27 V19 WA
ECU-IG 3 7
Y
1G V19 IG1
I14 Engine Room R/B
Ignition Switch
AM1 ALT
B-Y W
2 2
4 IG1 AM1 2 2 1 2 1
W
6
W-B
V16 GND2
31
W-B
V16 GND1
J9 8
W-B
V19 GND3
A
J4
J/C 16
W-B
V19 GND4
A
Battery EA IF IE J/C
F14360
2002 4RUNNER (RM887U)
Author : Date : 519
DI-344
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI-224 .
YES Repair circuit indicated by the output code.
NO
2 Check that ECU connectors are securely connected to ECU.
NO Connect the connector to ECU.
YES
3 Check battery positive voltage.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 14 V
NG Check and repair charging system.
OK
2002 4RUNNER (RM887U)
Author : Date : 520
DI-345
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
4 Check voltage of ECU IG power source.
In case of using the hand-held tester:
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 DATALIST mode on the hand-held tester.
CHECK:
Check the voltage condition output from the ECU displayed on the hand-held tester.
OK:
"Normal" is displayed.
ON In case of not using the hand-held tester:
PREPARATION:
V16
V19 Remove the skid control ECU with the connectors still con-
8 nected.
7
6
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 (V19 - 7) and
31 16 GND (V16 - 6, 31, V19 - 8, 16) of the skid control ECU.
F13777 OK:
Voltage: 10 - 14 V
OK Check and replace skid control ECU.
NG
2002 4RUNNER (RM887U)
Author : Date : 521
DI-346
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
5 Check operation of ABS warning light.
In case of using the hand-held tester:
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 that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the hand-
held tester.
In case of not using the hand-held tester:
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Turn the ignition switch ON.
CHECK:
Check that the ABS warning light goes off.
OK Check and replace combination meter (See
page BE-40 ).
NG
6 Check for short circuit in harness and connector between combination meter 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 : 522
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