18–
73
18
DTC Confirmation Procedure:
Confirm that battery voltage is between 11 and 14 V before performing the following procedures.
Turn ignition switch to LOCK.
Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC), and make it
communicate with vehicle electronic module by the data network.
Turn ignition switch to ON.
Using X-431 3G diagnostic tester to record and clear the DTCs stored in the TCU.
Turn ignition switch to LOCK and wait for a few seconds.
Turn ignition switch to ON, and then select "Read Code".
If DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
If DTC is not detected, the malfunction indicated by the DTC is intermittent. Please refer to Intermittent
DTC Troubleshooting.
Diagnosis Procedure
HINT:
After the fault is eliminated, verify DTC and symptom again.
DTC Code
DTC Definition
DTC Detection
Condition
DTC Set
Condition
Possible Cause
P0890
TCM Power Relay
Sense Circuit Low
Start engine and wait
for at least 10 seconds
TCU power
command is
sent, solenoid
output feedback
voltage is less
than the
standard value
Solenoid circuit
open circuit or
short circuit
TCU power relay
failure
P0891
TCM Power Relay
Sense Circuit High
TCU power
command is not
sent, solenoid
output feedback
voltage is higher
than the
standard value
1
Check if TCU power fuse EF19 and EF46 are normal
Replace failed fuse
NG
2
Check if battery to fuse box TCU fuse and relay circuit are normal
OK
Repair or replace failed circuit
NG
OK