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Step
3
1) Check if communication is possible by trying
communication with other controller
(ECM, ABS hydraulic unit/control module
assembly (if equipped) or SDM).
Is it possible to communicate with other control-
ler?
4
1) With ignition switch is OFF position, discon-
nect 8-pin ("G24") connector from P/S con-
trol module.
2) Check proper connection at "G24-3" ("BLU"
wire) terminal for serial data circuit.
3) If OK, then check resistance between "G24-
3" ("BLU" wire) terminal and "BLU" wire ter-
minal for serial data circuit in DLC.
Is resistance 1 Ω or less?
Fig. for Step 4
DTC TABLE
CAUTION:
Be sure to perform "SYSTEM CHECK FLOW TABLE" before starting diagnosis according to flow table
of each DTC.
Example : When VSS circuit fail (DTC 1121, DTC No.21) is set
Turn ON
"EPS" light
Turn OFF
Action
1. DLC
2. "BLU" wire terminal
21
1.0
3.0
0.3
0.3
0.3
ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-11
Yes
Go to Step 4.
Substitute a known-good
P/S control module and
recheck.
21
3.0
0.3
No
Repair open in common
section of serial data cir-
cuit ("BLU" wire circuit)
used by all controllers or
short to ground or power
circuit which has occurred
somewhere in serial data
circuit ("BLU" wire circuit).
Repair high resistance or
open in "BLU" wire circuit
for P/S system.
21
3.0
TIME
(sec.)
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